diff --git a/misc/drupal.js b/misc/drupal.js
index 79f9f755c576ba1aa2a682a5eeba7c209e24e59c..9f4327cf00dc544cc382657c064dacdc4edcaf2e 100644
--- a/misc/drupal.js
+++ b/misc/drupal.js
@@ -331,7 +331,21 @@ $('html').addClass('js');
// 'js enabled' cookie.
document.cookie = 'has_js=1; path=/';
-// Attach all behaviors.
+/**
+ * Additions to jQuery.support.
+ */
+$(function () {
+ /**
+ * Boolean indicating whether or not position:fixed is supported.
+ */
+ if (jQuery.support.positionFixed === undefined) {
+ var el = $('<div style="position:fixed; top:10px" />').appendTo(document.body);
+ jQuery.support.positionFixed = el[0].offsetTop === 10;
+ el.remove();
+ }
+});
+
+//Attach all behaviors.
$(function () {
Drupal.attachBehaviors(document, Drupal.settings);
});
diff --git a/misc/tableheader.js b/misc/tableheader.js
index 4efe26a43e156d8a694bcf809284358abfae77cc..c3e2e3a9d7100e79dd2a17893dce256e6c24deb4 100644
--- a/misc/tableheader.js
+++ b/misc/tableheader.js
@@ -1,118 +1,111 @@
// $Id$
(function ($) {
-Drupal.tableHeaderDoScroll = function () {
- if ($.isFunction(Drupal.tableHeaderOnScroll)) {
- Drupal.tableHeaderOnScroll();
- }
-};
-
+/**
+ * Attaches sticky table headers.
+ */
Drupal.behaviors.tableHeader = {
attach: function (context, settings) {
- // This breaks in anything less than IE 7. Prevent it from running.
- if ($.browser.msie && parseInt($.browser.version, 10) < 7) {
+ if (!$.support.positionFixed) {
return;
}
- $('table.sticky-enabled thead', context).once('tableheader', function () {
- // Clone the table header so it inherits original jQuery properties. Hide
- // the table to avoid a flash of the header clone upon page load.
- var headerClone = $(this).clone(true).hide().insertBefore(this.parentNode).wrap('<table class="sticky-header"></table>').parent().css({
- position: 'fixed',
- top: '0px'
- });
-
- headerClone = $(headerClone)[0];
+ $('table.sticky-enabled', context).once('tableheader', function () {
+ $(this).data("drupal-tableheader", new Drupal.tableHeader(this));
+ });
+ }
+};
- // Store parent table.
- var table = $(this).parent('table')[0];
- headerClone.table = table;
- // Finish initializing header positioning.
- tracker(headerClone);
- // We hid the header to avoid it showing up erroneously on page load;
- // we need to unhide it now so that it will show up when expected.
- $(headerClone).children('thead').show();
+/**
+ * Constructor for the tableHeader object. Provides sticky table headers.
+ *
+ * @param table
+ * DOM object for the table to add a sticky header to.
+ */
+Drupal.tableHeader = function (table) {
+ var self = this;
- $(table).addClass('sticky-table');
- });
+ this.originalTable = $(table);
+ this.originalHeader = $(table).children('thead');
+ this.originalHeaderCells = this.originalHeader.find('> tr > th');
- // Define the anchor holding var.
- var prevAnchor = '';
+ // Clone the table header so it inherits original jQuery properties. Hide
+ // the table to avoid a flash of the header clone upon page load.
+ this.stickyTable = $('<table class="sticky-header"/>')
+ .insertBefore(this.originalTable)
+ .css({ position: 'fixed', top: '0px' });
+ this.stickyHeader = this.originalHeader.clone(true)
+ .hide()
+ .appendTo(this.stickyTable);
+ this.stickyHeaderCells = this.stickyHeader.find('> tr > th');
- // Track positioning and visibility.
- function tracker(e) {
- // Reset top position of sticky table headers to the current top offset.
- var topOffset = Drupal.settings.tableHeaderOffset ? eval(Drupal.settings.tableHeaderOffset + '()') : 0;
- $('.sticky-header').css('top', topOffset + 'px');
- // Save positioning data.
- var viewHeight = document.documentElement.scrollHeight || document.body.scrollHeight;
- if (e.viewHeight != viewHeight) {
- e.viewHeight = viewHeight;
- e.vPosition = $(e.table).offset().top - 4 - topOffset;
- e.hPosition = $(e.table).offset().left;
- e.vLength = e.table.clientHeight - 100;
- // Resize header and its cell widths.
- var parentCell = $('th', e.table);
- $('th', e).each(function (index) {
- var cellWidth = parentCell.eq(index).css('width');
- // Exception for IE7.
- if (cellWidth == 'auto') {
- cellWidth = parentCell.get(index).clientWidth + 'px';
- }
- $(this).css('width', cellWidth);
- });
- $(e).css('width', $(e.table).css('width'));
+ this.originalTable.addClass('sticky-table');
+ $(window)
+ .bind('scroll.drupal-tableheader', $.proxy(this, 'eventhandlerRecalculateStickyHeader'))
+ .bind('resize.drupal-tableheader', { calculateWidth: true }, $.proxy(this, 'eventhandlerRecalculateStickyHeader'))
+ // Make sure the anchor being scrolled into view is not hidden beneath the
+ // sticky table header. Adjust the scrollTop if it does.
+ .bind('drupalDisplaceAnchor.drupal-tableheader', function () {
+ window.scrollBy(0, -self.stickyTable.outerHeight());
+ })
+ // Make sure the element being focused is not hidden beneath the sticky
+ // table header. Adjust the scrollTop if it does.
+ .bind('drupalDisplaceFocus.drupal-tableheader', function (event) {
+ if (self.stickyVisible && event.clientY < (self.stickyOffsetTop + self.stickyTable.outerHeight()) && event.$target.closest('sticky-header').length === 0) {
+ window.scrollBy(0, -self.stickyTable.outerHeight());
}
+ })
+ .triggerHandler('resize.drupal-tableheader');
- // Track horizontal positioning relative to the viewport and set visibility.
- var hScroll = document.documentElement.scrollLeft || document.body.scrollLeft;
- var vOffset = (document.documentElement.scrollTop || document.body.scrollTop) - e.vPosition;
- var visState = (vOffset > 0 && vOffset < e.vLength) ? 'visible' : 'hidden';
- $(e).css({ left: -hScroll + e.hPosition + 'px', visibility: visState });
+ // We hid the header to avoid it showing up erroneously on page load;
+ // we need to unhide it now so that it will show up when expected.
+ this.stickyHeader.show();
+};
- // Check the previous anchor to see if we need to scroll to make room for the header.
- // Get the height of the header table and scroll up that amount.
- if (prevAnchor != location.hash) {
- if (location.hash != '') {
- var scrollLocation = $('td' + location.hash).offset().top - $(e).height();
- $('body, html').scrollTop(scrollLocation);
- }
- prevAnchor = location.hash;
- }
- }
+/**
+ * Event handler: recalculates position of the sticky table header.
+ *
+ * @param event
+ * Event being triggered.
+ */
+Drupal.tableHeader.prototype.eventhandlerRecalculateStickyHeader = function (event) {
+ var self = this;
+ var calculateWidth = event.data && event.data.calculateWidth;
- // Only attach to scrollbars once, even if Drupal.attachBehaviors is called
- // multiple times.
- $('body').once(function () {
- $(window).scroll(Drupal.tableHeaderDoScroll);
- $(document.documentElement).scroll(Drupal.tableHeaderDoScroll);
- });
+ // Reset top position of sticky table headers to the current top offset.
+ this.stickyOffsetTop = Drupal.settings.tableHeaderOffset ? eval(Drupal.settings.tableHeaderOffset + '()') : 0;
+ this.stickyTable.css('top', this.stickyOffsetTop + 'px');
- // Track scrolling.
- Drupal.tableHeaderOnScroll = function () {
- $('table.sticky-header').each(function () {
- tracker(this);
- });
- };
+ // Save positioning data.
+ var viewHeight = document.documentElement.scrollHeight || document.body.scrollHeight;
+ if (calculateWidth || this.viewHeight !== viewHeight) {
+ this.viewHeight = viewHeight;
+ this.vPosition = this.originalTable.offset().top - 4 - this.stickyOffsetTop;
+ this.hPosition = this.originalTable.offset().left;
+ this.vLength = this.originalTable[0].clientHeight - 100;
+ calculateWidth = true;
+ }
+
+ // Track horizontal positioning relative to the viewport and set visibility.
+ var hScroll = document.documentElement.scrollLeft || document.body.scrollLeft;
+ var vOffset = (document.documentElement.scrollTop || document.body.scrollTop) - this.vPosition;
+ this.stickyVisible = vOffset > 0 && vOffset < this.vLength;
+ this.stickyTable.css({ left: (-hScroll + this.hPosition) + 'px', visibility: this.stickyVisible ? 'visible' : 'hidden' });
- // Track resizing.
- var time = null;
- var resize = function () {
- // Ensure minimum time between adjustments.
- if (time) {
- return;
+ // Only perform expensive calculations if the sticky header is actually
+ // visible or when forced.
+ if (this.stickyVisible && (calculateWidth || !this.widthCalculated)) {
+ this.widthCalculated = true;
+ // Resize header and its cell widths.
+ this.stickyHeaderCells.each(function (index) {
+ var cellWidth = self.originalHeaderCells.eq(index).css('width');
+ // Exception for IE7.
+ if (cellWidth == 'auto') {
+ cellWidth = self.originalHeaderCells.get(index).clientWidth + 'px';
}
- time = setTimeout(function () {
- $('table.sticky-header').each(function () {
- // Force cell width calculation.
- this.viewHeight = 0;
- tracker(this);
- });
- // Reset timer.
- time = null;
- }, 250);
- };
- $(window).resize(resize);
+ $(this).css('width', cellWidth);
+ });
+ this.stickyTable.css('width', this.originalTable.css('width'));
}
};