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window.stickyheader = (function(){
return {
controller : function(){
$('table').each(function() {
if($(this).find('thead').length > 0 && $(this).find('th').length > 0) {
// Clone <thead>
var $w = $(window),
$t = $(this),
$thead = $t.find('thead').clone(),
$col = $t.find('thead, tbody').clone();
// Add class, remove margins, reset width and wrap table
$t
.addClass('sticky-enabled')
.css({
margin: 0,
width: '100%'
}).wrap('<div class="sticky-wrap" />');
if($t.hasClass('overflow-y')) $t.removeClass('overflow-y').parent().addClass('overflow-y');
// Create new sticky table head (basic)
$t.after('<table class="sticky-thead" />');
// If <tbody> contains <th>, then we create sticky column and intersect (advanced)
if($t.find('tbody th').length > 0) {
$t.after('<table class="sticky-col" /><table class="sticky-intersect" />');
}
// Create shorthand for things
var $stickyHead = $(this).siblings('.sticky-thead'),
$stickyCol = $(this).siblings('.sticky-col'),
$stickyInsct = $(this).siblings('.sticky-intersect'),
$stickyWrap = $(this).parent('.sticky-wrap');
$stickyHead.append($thead);
$stickyCol
.append($col)
.find('thead th:gt(0)').remove()
.end()
.find('tbody td').remove();
$stickyInsct.html('<thead><tr><th>'+$t.find('thead th:first-child').html()+'</th></tr></thead>');
// Set widths
var setWidths = function () {
$t
.find('thead th').each(function (i) {
$stickyHead.find('th').eq(i).width($(this).width());
})
.end()
.find('tr').each(function (i) {
$stickyCol.find('tr').eq(i).height($(this).height());
});
// Set width of sticky table head
$stickyHead.width($t.width());
// Set width of sticky table col
$stickyCol.find('th').add($stickyInsct.find('th')).width($t.find('thead th').width())
},
repositionStickyHead = function () {
// Return value of calculated allowance
var allowance = calcAllowance();
// Check if wrapper parent is overflowing along the y-axis
if($t.height() > $stickyWrap.height()) {
// If it is overflowing (advanced layout)
// Position sticky header based on wrapper scrollTop()
if($stickyWrap.scrollTop() > 92) {
// When top of wrapping parent is out of view
$stickyHead.add($stickyInsct).css({
opacity: 1,
display : "initial",
top: $stickyWrap.scrollTop() + 92
});
} else {
// When top of wrapping parent is in view
$stickyHead.add($stickyInsct).css({
opacity: 0,
top: 92,
display : "none"
});
}
} else {
// If it is not overflowing (basic layout)
// Position sticky header based on viewport scrollTop
if($w.scrollTop() > $t.offset().top && $w.scrollTop() < $t.offset().top + $t.outerHeight() - allowance) {
// When top of viewport is in the table itself
$stickyHead.add($stickyInsct).css({
opacity: 1,
display : "initial",
top: $w.scrollTop() - $t.offset().top +92
});
} else {
// When top of viewport is above or below table
$stickyHead.add($stickyInsct).css({
opacity: 0,
top: 0,
display : "none"
});
}
}
},
repositionStickyCol = function () {
if($stickyWrap.scrollLeft() > 0) {
// When left of wrapping parent is out of view
$stickyCol.add($stickyInsct).css({
opacity: 1,
display : "initial",
left: $stickyWrap.scrollLeft()
});
} else {
// When left of wrapping parent is in view
$stickyCol
.css({ opacity: 0,
display : "none"})
.add($stickyInsct).css({ left: 0 });
}
},
calcAllowance = function () {
var a = 0;
// Calculate allowance
$t.find('tbody tr:lt(3)').each(function () {
a += $(this).height();
});
// Set fail safe limit (last three row might be too tall)
// Set arbitrary limit at 0.25 of viewport height, or you can use an arbitrary pixel value
if(a > $w.height()*0.25) {
a = $w.height()*0.25;
}
// Add the height of sticky header
a += $stickyHead.height();
return a;
};
setWidths();
$t.parent('.sticky-wrap').scroll($.throttle(250, function() {
repositionStickyHead();
repositionStickyCol();
}));
$w
.load(setWidths)
.resize($.debounce(250, function () {
setWidths();
repositionStickyHead();
repositionStickyCol();
}))
.scroll($.throttle(250, repositionStickyHead));
}
});
}
}
})();