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(function ($, Drupal) {
catch
committed
"use strict";
/**
* Attaches sticky table headers.
*/
Drupal.behaviors.tableHeader = {
attach: function (context) {
if (!$.support.fixedPosition) {
return;
}
$(window).one('scroll.TableHeaderInit', {context: context}, tableHeaderInitHandler);
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function scrollValue(position) {
return document.documentElement[position] || document.body[position];
}
// Select and initilize sticky table headers.
function tableHeaderInitHandler(e) {
var $tables = $(e.data.context).find('table.sticky-enabled').once('tableheader');
for (var i = 0, il = $tables.length; i < il; i++) {
TableHeader.tables.push(new TableHeader($tables[i]));
}
}
// Helper method to loop through tables and execute a method.
function forTables(method, arg) {
var tables = TableHeader.tables;
for (var i = 0, il = tables.length; i < il; i++) {
tables[i][method](arg);
}
}
function tableHeaderResizeHandler(e) {
forTables('recalculateSticky');
}
function tableHeaderOnScrollHandler(e) {
forTables('onScroll');
}
function tableHeaderOffsetChangeHandler(e) {
// Compute the new offset value.
TableHeader.computeOffsetTop();
forTables('stickyPosition', TableHeader.offsetTop);
}
// Bind event that need to change all tables.
$(window).on({
/**
* When resizing table width and offset top can change, recalculate everything.
*/
'resize.TableHeader': tableHeaderResizeHandler,
/**
* Bind only one event to take care of calling all scroll callbacks.
*/
'scroll.TableHeader': tableHeaderOnScrollHandler
});
// Bind to custom Drupal events.
$(document).on({
/**
* Recalculate columns width when window is resized and when show/hide
* weight is triggered.
*/
'columnschange.TableHeader': tableHeaderResizeHandler,
/**
* Offset value vas changed by a third party script.
*/
'offsettopchange.TableHeader': tableHeaderOffsetChangeHandler
});
/**
* Constructor for the tableHeader object. Provides sticky table headers.
*
* TableHeader will make the current table header stick to the top of the page
* if the table is very long.
*
* Fire a custom "topoffsetchange" event to make TableHeader compute the
* new offset value from the "data-offset-top" attributes of relevant elements.
*
* @param table
* DOM object for the table to add a sticky header to.
function TableHeader(table) {
var $table = $(table);
this.$originalTable = $table;
this.$originalHeader = $table.children('thead');
this.$originalHeaderCells = this.$originalHeader.find('> tr > th');
this.displayWeight = null;
this.$originalTable.addClass('sticky-table');
this.tableHeight = $table[0].clientHeight;
this.tableOffset = this.$originalTable.offset();
// React to columns change to avoid making checks in the scroll callback.
this.$originalTable.bind('columnschange', {tableHeader: this}, function (e, display) {
var tableHeader = e.data.tableHeader;
if (tableHeader.displayWeight === null || tableHeader.displayWeight !== display) {
tableHeader.recalculateSticky();
}
tableHeader.displayWeight = display;
});
// Create and display sticky header.
this.createSticky();
}
* Store the state of TableHeader.
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$.extend(TableHeader, {
/**
* This will store the state of all processed tables.
*
* @type {Array}
*/
tables: [],
/**
* Cache of computed offset value.
*
* @type {Number}
*/
offsetTop: 0,
/**
* Sum all [data-offset-top] values and cache it.
*/
computeOffsetTop: function () {
var $offsets = $('[data-offset-top]');
var value, sum = 0;
for (var i = 0, il = $offsets.length; i < il; i++) {
value = parseInt($offsets[i].getAttribute('data-offset-top'), 10);
sum += !isNaN(value) ? value : 0;
}
this.offsetTop = sum;
return sum;
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});
/**
* Extend TableHeader prototype.
*/
$.extend(TableHeader.prototype, {
/**
* Minimum height in pixels for the table to have a sticky header.
*/
minHeight: 100,
/**
* Absolute position of the table on the page.
*/
tableOffset: null,
/**
* Absolute position of the table on the page.
*/
tableHeight: null,
/**
* Boolean storing the sticky header visibility state.
*/
stickyVisible: false,
/**
* Create the duplicate header.
*/
createSticky: function () {
// Clone the table header so it inherits original jQuery properties.
var $stickyHeader = this.$originalHeader.clone(true);
// Hide the table to avoid a flash of the header clone upon page load.
this.$stickyTable = $('<table class="sticky-header"/>')
.css({
visibility: 'hidden',
position: 'fixed',
top: '0px'
})
.append($stickyHeader)
.insertBefore(this.$originalTable);
this.$stickyHeaderCells = $stickyHeader.find('> tr > th');
// Initialize all computations.
this.recalculateSticky();
},
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/**
* Set absolute position of sticky.
*
* @param offsetTop
* @param offsetLeft
*/
stickyPosition: function (offsetTop, offsetLeft) {
var css = {};
if (!isNaN(offsetTop)) {
css.top = offsetTop + 'px';
}
if (!isNaN(offsetLeft)) {
css.left = (this.tableOffset.left - offsetLeft) + 'px';
}
return this.$stickyTable.css(css);
},
/**
* Returns true if sticky is currently visible.
*/
checkStickyVisible: function () {
var scrollTop = scrollValue('scrollTop');
var tableTop = this.tableOffset.top - TableHeader.offsetTop;
var tableBottom = tableTop + this.tableHeight;
var visible = false;
if (tableTop < scrollTop && scrollTop < (tableBottom - this.minHeight)) {
visible = true;
}
this.stickyVisible = visible;
return visible;
},
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/**
* Check if sticky header should be displayed.
*
* This function is throttled to once every 250ms to avoid unnecessary calls.
*
* @param event
*/
onScroll: function (e) {
this.checkStickyVisible();
// Track horizontal positioning relative to the viewport.
this.stickyPosition(null, scrollValue('scrollLeft'));
this.$stickyTable.css('visibility', this.stickyVisible ? 'visible' : 'hidden');
},
/**
* Event handler: recalculates position of the sticky table header.
*
* @param event
* Event being triggered.
*/
recalculateSticky: function (event) {
// Update table size.
this.tableHeight = this.$originalTable[0].clientHeight;
// Update offset top.
TableHeader.computeOffsetTop();
this.tableOffset = this.$originalTable.offset();
this.stickyPosition(TableHeader.offsetTop);
// Update columns width.
var $that = null;
var $stickyCell = null;
var display = null;
// Resize header and its cell widths.
// Only apply width to visible table cells. This prevents the header from
// displaying incorrectly when the sticky header is no longer visible.
for (var i = 0, il = this.$originalHeaderCells.length; i < il; i++) {
$that = $(this.$originalHeaderCells[i]);
$stickyCell = this.$stickyHeaderCells.eq($that.index());
display = $that.css('display');
if (display !== 'none') {
$stickyCell.css({'width': $that.css('width'), 'display': display});
}
else {
$stickyCell.css('display', 'none');
}
}
this.$stickyTable.css('width', this.$originalTable.outerWidth());
}
});
// Expose constructor in the public space.
Drupal.TableHeader = TableHeader;