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Reevaluate table and header position and height when needed #10

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fe6eae1
Update stickyheader.jquery.js
Feb 27, 2018
2570a5b
Update stickyheader.jquery.js
Feb 28, 2018
76e999b
Update stickyheader.jquery.js
Mar 1, 2018
78b3701
Update stickyheader.jquery.js
Mar 2, 2018
243ea05
Update stickyheader.jquery.js
Mar 20, 2018
7f481a3
Use camelCase in stickyheader.jquery.js
Mar 20, 2018
3f90c21
Update stickyheader.jquery
Mar 29, 2018
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129 changes: 83 additions & 46 deletions stickyheader.jquery.js
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Original file line number Diff line number Diff line change
@@ -1,48 +1,85 @@
const STICK_HEADER = {
run: function () {
var $tables = $('table.stickyHeader');

$tables.each(function (i) {
var table = $tables[i];
var bodyHeight, cutoffTop, cutoffBottom, tableHeight, tableWidth;

var tableClone = $(table).clone(true).empty().removeClass('stickyHeader');
var theadClone = $(table).find('thead').clone(true);
var stickyHeader = $('<div></div>').addClass('stickyHeader hide').attr('aria-hidden', 'true');
stickyHeader.append(tableClone).find('table').append(theadClone);
$(table).after(stickyHeader);

var headerCells = $(table).find('thead th');
var headerCellHeight = $(headerCells[0]).height();

var noFixedSupport = (stickyHeader.css('position') === 'absolute');

var stickyHeaderCells = stickyHeader.find('th');

function evaluateHeaderPositionAndSize() {
bodyHeight = $('body').height()
tableHeight = $(table).height();
tableWidth = $(table).width() +
Number($(table).css('padding-left').replace(/px/ig,"")) +
Number($(table).css('padding-right').replace(/px/ig,"")) +
Number($(table).css('border-left-width').replace(/px/ig,"")) +
Number($(table).css('border-right-width').replace(/px/ig,""));
cutoffTop = $(table).offset().top;
cutoffBottom = tableHeight + cutoffTop - headerCellHeight;

for (var i = 0, l = headerCells.length; i < l; i++) {
if (headerCells[i].style.width.length > 0) {
// This takes into account other scripts that set header width
// such as DataTables
stickyHeaderCells[i].style.width = headerCells[i].style.width
} else {
stickyHeaderCells[i].style.width = headerCells[i].scrollWidth + 'px'
}
}

stickyHeader.css('width', tableWidth);
}

function setClassNames() {
for (var i = 0; i < stickyHeader.find('th').length; i++) {
stickyHeader.find('th')[i].className = $(table).find('thead th')[i].className
}
}

evaluateHeaderPositionAndSize()

window.onresize = function () {
evaluateHeaderPositionAndSize()
}

// Sometimes header class names change when clicked
// such as with dataTables sorting
$(table).find('th').click(setClassNames)
stickyHeader.find('th').click(setClassNames)

$(window).scroll(function() {
if (bodyHeight !== $('body').height()) {
evaluateHeaderPositionAndSize()
}

var currentPosition = $(window).scrollTop();
if (currentPosition > cutoffTop && currentPosition < cutoffBottom) {
stickyHeader.removeClass('hide');
if (noFixedSupport) {
stickyHeader.css('top', currentPosition + 'px');
}
}
else {
stickyHeader.addClass('hide');
}
});
});
}
}

jQuery(document).ready(function ($) {
var tables = $('table.stickyHeader');
tables.each(function(i){
var table = tables[i];
var tableClone = $(table).clone(true).empty().removeClass('stickyHeader');
var theadClone = $(table).find('thead').clone(true);
var stickyHeader = $('<div></div>').addClass('stickyHeader hide').attr('aria-hidden', 'true');
stickyHeader.append(tableClone).find('table').append(theadClone);
$(table).after(stickyHeader);

var tableHeight = $(table).height();
var tableWidth = $(table).width() + Number($(table).css('padding-left').replace(/px/ig,"")) + Number($(table).css('padding-right').replace(/px/ig,"")) + Number($(table).css('border-left-width').replace(/px/ig,"")) + Number($(table).css('border-right-width').replace(/px/ig,""));

var headerCells = $(table).find('thead th');
var headerCellHeight = $(headerCells[0]).height();

var no_fixed_support = false;
if (stickyHeader.css('position') == "absolute") {
no_fixed_support = true;
}

var stickyHeaderCells = stickyHeader.find('th');
stickyHeader.css('width', tableWidth);
var cellWidths = [];
for (var i = 0, l = headerCells.length; i < l; i++) {
cellWidths[i] = $(headerCells[i]).width();
}
for (var i = 0, l = headerCells.length; i < l; i++) {
$(stickyHeaderCells[i]).css('width', cellWidths[i]);
}

var cutoffTop = $(table).offset().top;
var cutoffBottom = tableHeight + cutoffTop - headerCellHeight;

$(window).scroll(function() {
var currentPosition = $(window).scrollTop();
if (currentPosition > cutoffTop && currentPosition < cutoffBottom) {
stickyHeader.removeClass('hide');
if (no_fixed_support) {
stickyHeader.css('top', currentPosition + 'px');
}
}
else {
stickyHeader.addClass('hide');
}
});
});
STICK_HEADER.run()
});