blog.hugopoi.net/www/.content.EZtzwPjb/html/31e9bac410fb8acae101396e7ae9087f87fd580e.00000778.js

227 lines
7.0 KiB
JavaScript

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