app/assets/javascripts/libs/jquery.expander.js
/*!
* jQuery Expander Plugin v1.4.3
*
* Date: Tue Jun 19 11:54:00 2012 EDT
* Requires: jQuery v1.3+
*
* Copyright 2011, Karl Swedberg
* Dual licensed under the MIT and GPL licenses (just like jQuery):
* http://www.opensource.org/licenses/mit-license.php
* http://www.gnu.org/licenses/gpl.html
*
*
*
*
*/
(function($) {
$.expander = {
version: '1.4.3',
defaults: {
// the number of characters at which the contents will be sliced into two parts.
slicePoint: 100,
// whether to keep the last word of the summary whole (true) or let it slice in the middle of a word (false)
preserveWords: true,
// a threshold of sorts for whether to initially hide/collapse part of the element's contents.
// If after slicing the contents in two there are fewer words in the second part than
// the value set by widow, we won't bother hiding/collapsing anything.
widow: 4,
// text displayed in a link instead of the hidden part of the element.
// clicking this will expand/show the hidden/collapsed text
expandText: 'read more',
expandPrefix: '… ',
expandAfterSummary: false,
// class names for summary element and detail element
summaryClass: 'summary',
detailClass: 'details',
// class names for <span> around "read-more" link and "read-less" link
moreClass: 'read-more',
lessClass: 'read-less',
// number of milliseconds after text has been expanded at which to collapse the text again.
// when 0, no auto-collapsing
collapseTimer: 0,
// effects for expanding and collapsing
expandEffect: 'slideDown',
expandSpeed: 250,
collapseEffect: 'slideUp',
collapseSpeed: 200,
// allow the user to re-collapse the expanded text.
userCollapse: true,
// text to use for the link to re-collapse the text
userCollapseText: 'read less',
userCollapsePrefix: ' ',
// all callback functions have the this keyword mapped to the element in the jQuery set when .expander() is called
onSlice: null, // function() {}
beforeExpand: null, // function() {},
afterExpand: null, // function() {},
onCollapse: null // function(byUser) {}
}
};
$.fn.expander = function(options) {
var meth = 'init';
if (typeof options == 'string') {
meth = options;
options = {};
}
var opts = $.extend({}, $.expander.defaults, options),
rSelfClose = /^<(?:area|br|col|embed|hr|img|input|link|meta|param).*>$/i,
rAmpWordEnd = opts.wordEnd || /(&(?:[^;]+;)?|[a-zA-Z\u00C0-\u0100]+)$/,
rOpenCloseTag = /<\/?(\w+)[^>]*>/g,
rOpenTag = /<(\w+)[^>]*>/g,
rCloseTag = /<\/(\w+)>/g,
rLastCloseTag = /(<\/[^>]+>)\s*$/,
rTagPlus = /^<[^>]+>.?/,
delayedCollapse;
var methods = {
init: function() {
this.each(function() {
var i, l, tmp, newChar, summTagless, summOpens, summCloses,
lastCloseTag, detailText, detailTagless,
$thisDetails, $readMore,
openTagsForDetails = [],
closeTagsForsummaryText = [],
defined = {},
thisEl = this,
$this = $(this),
$summEl = $([]),
o = $.extend({}, opts, $this.data('expander') || $.meta && $this.data() || {}),
hasDetails = !!$this.find('.' + o.detailClass).length,
hasBlocks = !!$this.find('*').filter(function() {
var display = $(this).css('display');
return (/^block|table|list/).test(display);
}).length,
el = hasBlocks ? 'div' : 'span',
detailSelector = el + '.' + o.detailClass,
moreSelector = 'span.' + o.moreClass,
expandSpeed = o.expandSpeed || 0,
allHtml = $.trim( $this.html() ),
allText = $.trim( $this.text() ),
summaryText = allHtml.slice(0, o.slicePoint);
// bail out if we've already set up the expander on this element
if ( $.data(this, 'expanderInit') ) {
return;
}
$.data(this, 'expanderInit', true);
// determine which callback functions are defined
$.each(['onSlice','beforeExpand', 'afterExpand', 'onCollapse'], function(index, val) {
defined[val] = $.isFunction(o[val]);
});
// back up if we're in the middle of a tag or word
summaryText = backup(summaryText);
// summary text sans tags length
summTagless = summaryText.replace(rOpenCloseTag, '').length;
// add more characters to the summary, one for each character in the tags
while (summTagless < o.slicePoint) {
newChar = allHtml.charAt(summaryText.length);
if (newChar == '<') {
newChar = allHtml.slice(summaryText.length).match(rTagPlus)[0];
}
summaryText += newChar;
summTagless++;
}
summaryText = backup(summaryText, o.preserveWords);
// separate open tags from close tags and clean up the lists
summOpens = summaryText.match(rOpenTag) || [];
summCloses = summaryText.match(rCloseTag) || [];
// filter out self-closing tags
tmp = [];
$.each(summOpens, function(index, val) {
if ( !rSelfClose.test(val) ) {
tmp.push(val);
}
});
summOpens = tmp;
// strip close tags to just the tag name
l = summCloses.length;
for (i = 0; i < l; i++) {
summCloses[i] = summCloses[i].replace(rCloseTag, '$1');
}
// tags that start in summary and end in detail need:
// a). close tag at end of summary
// b). open tag at beginning of detail
$.each(summOpens, function(index, val) {
var thisTagName = val.replace(rOpenTag, '$1');
var closePosition = $.inArray(thisTagName, summCloses);
if (closePosition === -1) {
openTagsForDetails.push(val);
closeTagsForsummaryText.push('</' + thisTagName + '>');
} else {
summCloses.splice(closePosition, 1);
}
});
// reverse the order of the close tags for the summary so they line up right
closeTagsForsummaryText.reverse();
// create necessary summary and detail elements if they don't already exist
if ( !hasDetails ) {
// end script if there is no detail text or if detail has fewer words than widow option
detailText = allHtml.slice(summaryText.length);
detailTagless = $.trim( detailText.replace(rOpenCloseTag, '') );
if ( detailTagless === '' || detailTagless.split(/\s+/).length < o.widow ) {
return;
}
// otherwise, continue...
lastCloseTag = closeTagsForsummaryText.pop() || '';
summaryText += closeTagsForsummaryText.join('');
detailText = openTagsForDetails.join('') + detailText;
} else {
// assume that even if there are details, we still need readMore/readLess/summary elements
// (we already bailed out earlier when readMore el was found)
// but we need to create els differently
// remove the detail from the rest of the content
detailText = $this.find(detailSelector).remove().html();
// The summary is what's left
summaryText = $this.html();
// allHtml is the summary and detail combined (this is needed when content has block-level elements)
allHtml = summaryText + detailText;
lastCloseTag = '';
}
o.moreLabel = $this.find(moreSelector).length ? '' : buildMoreLabel(o);
if (hasBlocks) {
detailText = allHtml;
}
summaryText += lastCloseTag;
// onSlice callback
o.summary = summaryText;
o.details = detailText;
o.lastCloseTag = lastCloseTag;
if (defined.onSlice) {
// user can choose to return a modified options object
// one last chance for user to change the options. sneaky, huh?
// but could be tricky so use at your own risk.
tmp = o.onSlice.call(thisEl, o);
// so, if the returned value from the onSlice function is an object with a details property, we'll use that!
o = tmp && tmp.details ? tmp : o;
}
// build the html with summary and detail and use it to replace old contents
var html = buildHTML(o, hasBlocks);
$this.html( html );
// set up details and summary for expanding/collapsing
$thisDetails = $this.find(detailSelector);
$readMore = $this.find(moreSelector);
$thisDetails[o.collapseEffect](0);
$readMore.find('a').unbind('click.expander').bind('click.expander', expand);
$summEl = $this.find('div.' + o.summaryClass);
if ( o.userCollapse && !$this.find('span.' + o.lessClass).length ) {
$this
.find(detailSelector)
.append('<span class="' + o.lessClass + '">' + o.userCollapsePrefix + '<a href="#">' + o.userCollapseText + '</a></span>');
}
$this
.find('span.' + o.lessClass + ' a')
.unbind('click.expander')
.bind('click.expander', function(event) {
event.preventDefault();
clearTimeout(delayedCollapse);
var $detailsCollapsed = $(this).closest(detailSelector);
reCollapse(o, $detailsCollapsed);
if (defined.onCollapse) {
o.onCollapse.call(thisEl, true);
}
});
function expand(event) {
event.preventDefault();
$readMore.hide();
$summEl.hide();
if (defined.beforeExpand) {
o.beforeExpand.call(thisEl);
}
$thisDetails.stop(false, true)[o.expandEffect](expandSpeed, function() {
$thisDetails.css({zoom: ''});
if (defined.afterExpand) {o.afterExpand.call(thisEl);}
delayCollapse(o, $thisDetails, thisEl);
});
}
}); // this.each
},
destroy: function() {
this.each(function() {
var o, details,
$this = $(this);
if ( !$this.data('expanderInit') ) {
return;
}
o = $.extend({}, opts, $this.data('expander') || $.meta && $this.data() || {}),
details = $this.find('.' + o.detailClass).contents();
$this.removeData('expanderInit');
$this.removeData('expander');
$this.find('.' + o.moreClass).remove();
$this.find('.' + o.summaryClass).remove();
$this.find('.' + o.detailClass).after(details).remove();
$this.find('.' + o.lessClass).remove();
});
}
};
// run the methods (almost always "init")
if ( methods[meth] ) {
methods[ meth ].call(this);
}
// utility functions
function buildHTML(o, blocks) {
var el = 'span',
summary = o.summary;
if ( blocks ) {
el = 'div';
// if summary ends with a close tag, tuck the moreLabel inside it
if ( rLastCloseTag.test(summary) && !o.expandAfterSummary) {
summary = summary.replace(rLastCloseTag, o.moreLabel + '$1');
} else {
// otherwise (e.g. if ends with self-closing tag) just add moreLabel after summary
// fixes #19
summary += o.moreLabel;
}
// and wrap it in a div
summary = '<div class="' + o.summaryClass + '">' + summary + '</div>';
} else {
summary += o.moreLabel;
}
return [
summary,
'<',
el + ' class="' + o.detailClass + '"',
'>',
o.details,
'</' + el + '>'
].join('');
}
function buildMoreLabel(o) {
var ret = '<span class="' + o.moreClass + '">' + o.expandPrefix;
ret += '<a href="#">' + o.expandText + '</a></span>';
return ret;
}
function backup(txt, preserveWords) {
if ( txt.lastIndexOf('<') > txt.lastIndexOf('>') ) {
txt = txt.slice( 0, txt.lastIndexOf('<') );
}
if (preserveWords) {
txt = txt.replace(rAmpWordEnd,'');
}
return $.trim(txt);
}
function reCollapse(o, el) {
el.stop(true, true)[o.collapseEffect](o.collapseSpeed, function() {
var prevMore = el.prev('span.' + o.moreClass).show();
if (!prevMore.length) {
el.parent().children('div.' + o.summaryClass).show()
.find('span.' + o.moreClass).show();
}
});
}
function delayCollapse(option, $collapseEl, thisEl) {
if (option.collapseTimer) {
delayedCollapse = setTimeout(function() {
reCollapse(option, $collapseEl);
if ( $.isFunction(option.onCollapse) ) {
option.onCollapse.call(thisEl, false);
}
}, option.collapseTimer);
}
}
return this;
};
// plugin defaults
$.fn.expander.defaults = $.expander.defaults;
})(jQuery);