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// $Id$
(function ($) {
Drupal.tableHeaderDoScroll = function () {
if ($.isFunction(Drupal.tableHeaderOnScroll)) {
Drupal.tableHeaderOnScroll();
}
};
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) {
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];
// 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();
$(table).addClass('sticky-table');
});
// Define the anchor holding var.
var prevAnchor = '';
// Track positioning and visibility.
function tracker(e) {
// Reset top position of sticky table headers to the current top offset.
var topOffset = Drupal.displace ? Drupal.displace.getDisplacement('top') : 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'));
}
// 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 });
// 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;
}
}
// 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);
});
// Track scrolling.
Drupal.tableHeaderOnScroll = function () {
$('table.sticky-header').each(function () {
tracker(this);
});
};
// Track resizing.
var time = null;
var resize = function () {
// Ensure minimum time between adjustments.
if (time) {
return;
}
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);
}
};
})(jQuery);
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