227 lines
7.0 KiB
JavaScript
227 lines
7.0 KiB
JavaScript
/**
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* jquery.matchHeight.js v0.5.1
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* http://brm.io/jquery-match-height/
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* License: MIT
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*/
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(function($) {
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$.fn.matchHeight = function(byRow) {
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// handle matchHeight('remove')
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if (byRow === 'remove') {
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var that = this;
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// remove fixed height from all selected elements
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this.css('height', '');
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// remove selected elements from all groups
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$.each($.fn.matchHeight._groups, function(key, group) {
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group.elements = group.elements.not(that);
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});
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// TODO: cleanup empty groups
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return this;
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}
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if (this.length <= 1)
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return this;
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// byRow default to true
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byRow = (typeof byRow !== 'undefined') ? byRow : true;
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// keep track of this group so we can re-apply later on load and resize events
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$.fn.matchHeight._groups.push({
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elements: this,
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byRow: byRow
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});
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// match each element's height to the tallest element in the selection
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$.fn.matchHeight._apply(this, byRow);
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return this;
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};
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$.fn.matchHeight._apply = function(elements, byRow) {
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var $elements = $(elements),
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rows = [$elements];
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// get rows if using byRow, otherwise assume one row
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if (byRow) {
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// must first force an arbitrary equal height so floating elements break evenly
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$elements.css({
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'display': 'block',
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'padding-top': '0',
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'padding-bottom': '0',
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'border-top': '0',
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'border-bottom': '0',
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'height': '100px'
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});
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// get the array of rows (based on element top position)
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rows = _rows($elements);
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// revert the temporary forced style
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$elements.css({
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'display': '',
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'padding-top': '',
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'padding-bottom': '',
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'border-top': '',
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'border-bottom': '',
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'height': ''
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});
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}
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$.each(rows, function(key, row) {
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var $row = $(row),
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maxHeight = 0;
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// iterate the row and find the max height
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$row.each(function(){
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var $that = $(this);
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// ensure we get the correct actual height (and not a previously set height value)
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$that.css({ 'display': 'block', 'height': '' });
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// find the max height (including padding, but not margin)
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if ($that.outerHeight(false) > maxHeight)
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maxHeight = $that.outerHeight(false);
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// revert display block
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$that.css({ 'display': '' });
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});
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// iterate the row and apply the height to all elements
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$row.each(function(){
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var $that = $(this),
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verticalPadding = 0;
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// handle padding and border correctly (required when not using border-box)
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if ($that.css('box-sizing') !== 'border-box') {
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verticalPadding += _parse($that.css('border-top-width')) + _parse($that.css('border-bottom-width'));
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verticalPadding += _parse($that.css('padding-top')) + _parse($that.css('padding-bottom'));
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}
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// set the height (accounting for padding and border)
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$that.css('height', maxHeight - verticalPadding);
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});
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});
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return this;
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};
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/*
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* _applyDataApi will apply matchHeight to all elements with a data-match-height attribute
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*/
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$.fn.matchHeight._applyDataApi = function() {
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var groups = {};
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// generate groups by their groupId set by elements using data-match-height
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$('[data-match-height], [data-mh]').each(function() {
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var $this = $(this),
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groupId = $this.attr('data-match-height');
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if (groupId in groups) {
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groups[groupId] = groups[groupId].add($this);
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} else {
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groups[groupId] = $this;
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}
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});
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// apply matchHeight to each group
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$.each(groups, function() {
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this.matchHeight(true);
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});
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};
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/*
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* _update function will re-apply matchHeight to all groups with the correct options
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*/
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$.fn.matchHeight._groups = [];
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$.fn.matchHeight._throttle = 80;
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var previousResizeWidth = -1,
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updateTimeout = -1;
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$.fn.matchHeight._update = function(event) {
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// prevent update if fired from a resize event
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// where the viewport width hasn't actually changed
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// fixes an event looping bug in IE8
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if (event && event.type === 'resize') {
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var windowWidth = $(window).width();
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if (windowWidth === previousResizeWidth)
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return;
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previousResizeWidth = windowWidth;
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}
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// throttle updates
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if (updateTimeout === -1) {
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updateTimeout = setTimeout(function() {
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$.each($.fn.matchHeight._groups, function() {
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$.fn.matchHeight._apply(this.elements, this.byRow);
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});
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updateTimeout = -1;
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}, $.fn.matchHeight._throttle);
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}
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};
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/*
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* bind events
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*/
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// apply on DOM ready event
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$($.fn.matchHeight._applyDataApi);
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// update heights on load and resize events
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$(window).bind('load resize orientationchange', $.fn.matchHeight._update);
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/*
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* rows utility function
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* returns array of jQuery selections representing each row
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* (as displayed after float wrapping applied by browser)
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*/
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var _rows = function(elements) {
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var tolerance = 1,
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$elements = $(elements),
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lastTop = null,
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rows = [];
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// group elements by their top position
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$elements.each(function(){
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var $that = $(this),
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top = $that.offset().top - _parse($that.css('margin-top')),
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lastRow = rows.length > 0 ? rows[rows.length - 1] : null;
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if (lastRow === null) {
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// first item on the row, so just push it
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rows.push($that);
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} else {
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// if the row top is the same, add to the row group
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if (Math.floor(Math.abs(lastTop - top)) <= tolerance) {
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rows[rows.length - 1] = lastRow.add($that);
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} else {
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// otherwise start a new row group
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rows.push($that);
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}
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}
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// keep track of the last row top
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lastTop = top;
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});
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return rows;
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};
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var _parse = function(value) {
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// parse value and convert NaN to 0
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return parseFloat(value) || 0;
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};
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})(jQuery); |