673 lines
16 KiB
JavaScript
673 lines
16 KiB
JavaScript
/*! FixedHeader 3.1.2
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* ©2009-2016 SpryMedia Ltd - datatables.net/license
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*/
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/**
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* @summary FixedHeader
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* @description Fix a table's header or footer, so it is always visible while
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* scrolling
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* @version 3.1.2
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* @file dataTables.fixedHeader.js
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* @author SpryMedia Ltd (www.sprymedia.co.uk)
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* @contact www.sprymedia.co.uk/contact
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* @copyright Copyright 2009-2016 SpryMedia Ltd.
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*
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* This source file is free software, available under the following license:
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* MIT license - http://datatables.net/license/mit
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*
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* This source file is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the license files for details.
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*
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* For details please refer to: http://www.datatables.net
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*/
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(function( factory ){
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if ( typeof define === 'function' && define.amd ) {
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// AMD
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define( ['jquery', 'datatables.net'], function ( $ ) {
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return factory( $, window, document );
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} );
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}
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else if ( typeof exports === 'object' ) {
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// CommonJS
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module.exports = function (root, $) {
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if ( ! root ) {
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root = window;
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}
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if ( ! $ || ! $.fn.dataTable ) {
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$ = require('datatables.net')(root, $).$;
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}
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return factory( $, root, root.document );
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};
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}
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else {
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// Browser
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factory( jQuery, window, document );
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}
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}(function( $, window, document, undefined ) {
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'use strict';
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var DataTable = $.fn.dataTable;
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var _instCounter = 0;
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var FixedHeader = function ( dt, config ) {
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// Sanity check - you just know it will happen
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if ( ! (this instanceof FixedHeader) ) {
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throw "FixedHeader must be initialised with the 'new' keyword.";
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}
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// Allow a boolean true for defaults
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if ( config === true ) {
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config = {};
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}
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dt = new DataTable.Api( dt );
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this.c = $.extend( true, {}, FixedHeader.defaults, config );
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this.s = {
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dt: dt,
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position: {
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theadTop: 0,
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tbodyTop: 0,
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tfootTop: 0,
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tfootBottom: 0,
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width: 0,
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left: 0,
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tfootHeight: 0,
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theadHeight: 0,
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windowHeight: $(window).height(),
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visible: true
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},
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headerMode: null,
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footerMode: null,
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autoWidth: dt.settings()[0].oFeatures.bAutoWidth,
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namespace: '.dtfc'+(_instCounter++),
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scrollLeft: {
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header: -1,
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footer: -1
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},
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enable: true
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};
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this.dom = {
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floatingHeader: null,
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thead: $(dt.table().header()),
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tbody: $(dt.table().body()),
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tfoot: $(dt.table().footer()),
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header: {
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host: null,
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floating: null,
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placeholder: null
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},
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footer: {
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host: null,
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floating: null,
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placeholder: null
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}
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};
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this.dom.header.host = this.dom.thead.parent();
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this.dom.footer.host = this.dom.tfoot.parent();
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var dtSettings = dt.settings()[0];
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if ( dtSettings._fixedHeader ) {
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throw "FixedHeader already initialised on table "+dtSettings.nTable.id;
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}
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dtSettings._fixedHeader = this;
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this._constructor();
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};
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/*
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* Variable: FixedHeader
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* Purpose: Prototype for FixedHeader
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* Scope: global
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*/
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$.extend( FixedHeader.prototype, {
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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
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* API methods
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*/
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/**
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* Enable / disable the fixed elements
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*
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* @param {boolean} enable `true` to enable, `false` to disable
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*/
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enable: function ( enable )
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{
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this.s.enable = enable;
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if ( this.c.header ) {
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this._modeChange( 'in-place', 'header', true );
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}
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if ( this.c.footer && this.dom.tfoot.length ) {
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this._modeChange( 'in-place', 'footer', true );
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}
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this.update();
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},
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/**
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* Set header offset
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*
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* @param {int} new value for headerOffset
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*/
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headerOffset: function ( offset )
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{
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if ( offset !== undefined ) {
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this.c.headerOffset = offset;
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this.update();
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}
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return this.c.headerOffset;
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},
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/**
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* Set footer offset
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*
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* @param {int} new value for footerOffset
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*/
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footerOffset: function ( offset )
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{
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if ( offset !== undefined ) {
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this.c.footerOffset = offset;
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this.update();
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}
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return this.c.footerOffset;
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},
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/**
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* Recalculate the position of the fixed elements and force them into place
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*/
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update: function ()
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{
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this._positions();
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this._scroll( true );
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},
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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
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* Constructor
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*/
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/**
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* FixedHeader constructor - adding the required event listeners and
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* simple initialisation
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*
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* @private
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*/
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_constructor: function ()
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{
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var that = this;
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var dt = this.s.dt;
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$(window)
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.on( 'scroll'+this.s.namespace, function () {
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that._scroll();
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} )
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.on( 'resize'+this.s.namespace, function () {
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that.s.position.windowHeight = $(window).height();
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that.update();
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} );
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var autoHeader = $('.fh-fixedHeader');
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if ( ! this.c.headerOffset && autoHeader.length ) {
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this.c.headerOffset = autoHeader.outerHeight();
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}
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var autoFooter = $('.fh-fixedFooter');
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if ( ! this.c.footerOffset && autoFooter.length ) {
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this.c.footerOffset = autoFooter.outerHeight();
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}
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dt.on( 'column-reorder.dt.dtfc column-visibility.dt.dtfc draw.dt.dtfc column-sizing.dt.dtfc', function () {
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that.update();
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} );
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dt.on( 'destroy.dtfc', function () {
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dt.off( '.dtfc' );
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$(window).off( that.s.namespace );
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} );
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this._positions();
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this._scroll();
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},
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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
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* Private methods
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*/
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/**
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* Clone a fixed item to act as a place holder for the original element
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* which is moved into a clone of the table element, and moved around the
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* document to give the fixed effect.
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*
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* @param {string} item 'header' or 'footer'
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* @param {boolean} force Force the clone to happen, or allow automatic
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* decision (reuse existing if available)
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* @private
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*/
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_clone: function ( item, force )
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{
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var dt = this.s.dt;
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var itemDom = this.dom[ item ];
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var itemElement = item === 'header' ?
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this.dom.thead :
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this.dom.tfoot;
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if ( ! force && itemDom.floating ) {
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// existing floating element - reuse it
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itemDom.floating.removeClass( 'fixedHeader-floating fixedHeader-locked' );
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}
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else {
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if ( itemDom.floating ) {
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itemDom.placeholder.remove();
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this._unsize( item );
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itemDom.floating.children().detach();
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itemDom.floating.remove();
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}
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itemDom.floating = $( dt.table().node().cloneNode( false ) )
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.css( 'table-layout', 'fixed' )
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.removeAttr( 'id' )
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.append( itemElement )
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.appendTo( 'body' );
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// Insert a fake thead/tfoot into the DataTable to stop it jumping around
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itemDom.placeholder = itemElement.clone( false );
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itemDom.host.prepend( itemDom.placeholder );
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// Clone widths
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this._matchWidths( itemDom.placeholder, itemDom.floating );
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}
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},
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/**
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* Copy widths from the cells in one element to another. This is required
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* for the footer as the footer in the main table takes its sizes from the
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* header columns. That isn't present in the footer so to have it still
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* align correctly, the sizes need to be copied over. It is also required
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* for the header when auto width is not enabled
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*
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* @param {jQuery} from Copy widths from
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* @param {jQuery} to Copy widths to
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* @private
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*/
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_matchWidths: function ( from, to ) {
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var get = function ( name ) {
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return $(name, from)
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.map( function () {
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return $(this).width();
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} ).toArray();
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};
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var set = function ( name, toWidths ) {
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$(name, to).each( function ( i ) {
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$(this).css( {
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width: toWidths[i],
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minWidth: toWidths[i]
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} );
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} );
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};
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var thWidths = get( 'th' );
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var tdWidths = get( 'td' );
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set( 'th', thWidths );
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set( 'td', tdWidths );
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},
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/**
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* Remove assigned widths from the cells in an element. This is required
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* when inserting the footer back into the main table so the size is defined
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* by the header columns and also when auto width is disabled in the
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* DataTable.
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*
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* @param {string} item The `header` or `footer`
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* @private
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*/
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_unsize: function ( item ) {
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var el = this.dom[ item ].floating;
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if ( el && (item === 'footer' || (item === 'header' && ! this.s.autoWidth)) ) {
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$('th, td', el).css( {
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width: '',
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minWidth: ''
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} );
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}
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else if ( el && item === 'header' ) {
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$('th, td', el).css( 'min-width', '' );
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}
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},
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/**
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* Reposition the floating elements to take account of horizontal page
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* scroll
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*
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* @param {string} item The `header` or `footer`
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* @param {int} scrollLeft Document scrollLeft
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* @private
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*/
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_horizontal: function ( item, scrollLeft )
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{
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var itemDom = this.dom[ item ];
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var position = this.s.position;
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var lastScrollLeft = this.s.scrollLeft;
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if ( itemDom.floating && lastScrollLeft[ item ] !== scrollLeft ) {
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itemDom.floating.css( 'left', position.left - scrollLeft );
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lastScrollLeft[ item ] = scrollLeft;
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}
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},
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/**
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* Change from one display mode to another. Each fixed item can be in one
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* of:
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*
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* * `in-place` - In the main DataTable
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* * `in` - Floating over the DataTable
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* * `below` - (Header only) Fixed to the bottom of the table body
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* * `above` - (Footer only) Fixed to the top of the table body
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*
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* @param {string} mode Mode that the item should be shown in
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* @param {string} item 'header' or 'footer'
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* @param {boolean} forceChange Force a redraw of the mode, even if already
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* in that mode.
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* @private
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*/
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_modeChange: function ( mode, item, forceChange )
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{
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var dt = this.s.dt;
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var itemDom = this.dom[ item ];
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var position = this.s.position;
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// Record focus. Browser's will cause input elements to loose focus if
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// they are inserted else where in the doc
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var tablePart = this.dom[ item==='footer' ? 'tfoot' : 'thead' ];
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var focus = $.contains( tablePart[0], document.activeElement ) ?
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document.activeElement :
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null;
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if ( mode === 'in-place' ) {
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// Insert the header back into the table's real header
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if ( itemDom.placeholder ) {
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itemDom.placeholder.remove();
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itemDom.placeholder = null;
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}
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this._unsize( item );
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if ( item === 'header' ) {
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itemDom.host.prepend( this.dom.thead );
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}
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else {
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itemDom.host.append( this.dom.tfoot );
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}
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if ( itemDom.floating ) {
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itemDom.floating.remove();
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itemDom.floating = null;
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}
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}
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else if ( mode === 'in' ) {
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// Remove the header from the read header and insert into a fixed
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// positioned floating table clone
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this._clone( item, forceChange );
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itemDom.floating
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.addClass( 'fixedHeader-floating' )
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.css( item === 'header' ? 'top' : 'bottom', this.c[item+'Offset'] )
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.css( 'left', position.left+'px' )
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.css( 'width', position.width+'px' );
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if ( item === 'footer' ) {
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itemDom.floating.css( 'top', '' );
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}
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}
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else if ( mode === 'below' ) { // only used for the header
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// Fix the position of the floating header at base of the table body
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this._clone( item, forceChange );
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itemDom.floating
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.addClass( 'fixedHeader-locked' )
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.css( 'top', position.tfootTop - position.theadHeight )
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.css( 'left', position.left+'px' )
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.css( 'width', position.width+'px' );
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}
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else if ( mode === 'above' ) { // only used for the footer
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// Fix the position of the floating footer at top of the table body
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this._clone( item, forceChange );
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itemDom.floating
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.addClass( 'fixedHeader-locked' )
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.css( 'top', position.tbodyTop )
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.css( 'left', position.left+'px' )
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.css( 'width', position.width+'px' );
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}
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// Restore focus if it was lost
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if ( focus && focus !== document.activeElement ) {
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focus.focus();
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}
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this.s.scrollLeft.header = -1;
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this.s.scrollLeft.footer = -1;
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this.s[item+'Mode'] = mode;
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},
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/**
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* Cache the positional information that is required for the mode
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* calculations that FixedHeader performs.
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*
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* @private
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*/
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_positions: function ()
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{
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var dt = this.s.dt;
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var table = dt.table();
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var position = this.s.position;
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var dom = this.dom;
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var tableNode = $(table.node());
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// Need to use the header and footer that are in the main table,
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// regardless of if they are clones, since they hold the positions we
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// want to measure from
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var thead = tableNode.children('thead');
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var tfoot = tableNode.children('tfoot');
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var tbody = dom.tbody;
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position.visible = tableNode.is(':visible');
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position.width = tableNode.outerWidth();
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position.left = tableNode.offset().left;
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position.theadTop = thead.offset().top;
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position.tbodyTop = tbody.offset().top;
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position.theadHeight = position.tbodyTop - position.theadTop;
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if ( tfoot.length ) {
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position.tfootTop = tfoot.offset().top;
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position.tfootBottom = position.tfootTop + tfoot.outerHeight();
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position.tfootHeight = position.tfootBottom - position.tfootTop;
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}
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else {
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position.tfootTop = position.tbodyTop + tbody.outerHeight();
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position.tfootBottom = position.tfootTop;
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position.tfootHeight = position.tfootTop;
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}
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},
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/**
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* Mode calculation - determine what mode the fixed items should be placed
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* into.
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*
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* @param {boolean} forceChange Force a redraw of the mode, even if already
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* in that mode.
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* @private
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*/
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_scroll: function ( forceChange )
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{
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var windowTop = $(document).scrollTop();
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var windowLeft = $(document).scrollLeft();
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var position = this.s.position;
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var headerMode, footerMode;
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if ( ! this.s.enable ) {
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return;
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}
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if ( this.c.header ) {
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if ( ! position.visible || windowTop <= position.theadTop - this.c.headerOffset ) {
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headerMode = 'in-place';
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}
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else if ( windowTop <= position.tfootTop - position.theadHeight - this.c.headerOffset ) {
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headerMode = 'in';
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}
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else {
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headerMode = 'below';
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}
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if ( forceChange || headerMode !== this.s.headerMode ) {
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this._modeChange( headerMode, 'header', forceChange );
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}
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this._horizontal( 'header', windowLeft );
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}
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if ( this.c.footer && this.dom.tfoot.length ) {
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if ( ! position.visible || windowTop + position.windowHeight >= position.tfootBottom + this.c.footerOffset ) {
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footerMode = 'in-place';
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}
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else if ( position.windowHeight + windowTop > position.tbodyTop + position.tfootHeight + this.c.footerOffset ) {
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footerMode = 'in';
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}
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else {
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footerMode = 'above';
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}
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if ( forceChange || footerMode !== this.s.footerMode ) {
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this._modeChange( footerMode, 'footer', forceChange );
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}
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this._horizontal( 'footer', windowLeft );
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}
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}
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} );
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/**
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* Version
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* @type {String}
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* @static
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*/
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FixedHeader.version = "3.1.2";
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/**
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* Defaults
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* @type {Object}
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* @static
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*/
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FixedHeader.defaults = {
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header: true,
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footer: false,
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headerOffset: 0,
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footerOffset: 0
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};
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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
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* DataTables interfaces
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*/
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// Attach for constructor access
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$.fn.dataTable.FixedHeader = FixedHeader;
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$.fn.DataTable.FixedHeader = FixedHeader;
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// DataTables creation - check if the FixedHeader option has been defined on the
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// table and if so, initialise
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$(document).on( 'init.dt.dtfh', function (e, settings, json) {
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if ( e.namespace !== 'dt' ) {
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return;
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}
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var init = settings.oInit.fixedHeader;
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var defaults = DataTable.defaults.fixedHeader;
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if ( (init || defaults) && ! settings._fixedHeader ) {
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var opts = $.extend( {}, defaults, init );
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if ( init !== false ) {
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new FixedHeader( settings, opts );
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}
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}
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} );
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// DataTables API methods
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DataTable.Api.register( 'fixedHeader()', function () {} );
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DataTable.Api.register( 'fixedHeader.adjust()', function () {
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return this.iterator( 'table', function ( ctx ) {
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var fh = ctx._fixedHeader;
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if ( fh ) {
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fh.update();
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}
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} );
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} );
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DataTable.Api.register( 'fixedHeader.enable()', function ( flag ) {
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return this.iterator( 'table', function ( ctx ) {
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var fh = ctx._fixedHeader;
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if ( fh ) {
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fh.enable( flag !== undefined ? flag : true );
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}
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} );
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} );
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DataTable.Api.register( 'fixedHeader.disable()', function ( ) {
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return this.iterator( 'table', function ( ctx ) {
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var fh = ctx._fixedHeader;
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if ( fh ) {
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fh.enable( false );
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}
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} );
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} );
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$.each( ['header', 'footer'], function ( i, el ) {
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DataTable.Api.register( 'fixedHeader.'+el+'Offset()', function ( offset ) {
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var ctx = this.context;
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if ( offset === undefined ) {
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return ctx.length && ctx[0]._fixedHeader ?
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ctx[0]._fixedHeader[el +'Offset']() :
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undefined;
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}
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return this.iterator( 'table', function ( ctx ) {
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var fh = ctx._fixedHeader;
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if ( fh ) {
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fh[ el +'Offset' ]( offset );
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}
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} );
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} );
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} );
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return FixedHeader;
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}));
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