98 lines
3.2 KiB
JavaScript
98 lines
3.2 KiB
JavaScript
// HTML Truncator for jQuery
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// by Henrik Nyh <http://henrik.nyh.se> 2008-02-28.
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// Free to modify and redistribute with credit.
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(function($) {
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var trailing_whitespace = true;
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$.fn.truncate = function(options) {
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var opts = $.extend({}, $.fn.truncate.defaults, options);
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$(this).each(function() {
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var content_length = $.trim(squeeze($(this).text())).length;
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if (content_length <= opts.max_length)
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return; // bail early if not overlong
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var actual_max_length = opts.max_length - opts.more.length - 3; // 3 for " ()"
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var truncated_node = recursivelyTruncate(this, actual_max_length);
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var full_node = $(this).hide();
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truncated_node.insertAfter(full_node);
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findNodeForMore(truncated_node).append(' (<a href="#show more content">'+opts.more+'</a>)');
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findNodeForLess(full_node).append(' (<a href="#show less content">'+opts.less+'</a>)');
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truncated_node.find('a:last').click(function() {
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truncated_node.hide(); full_node.show(); return false;
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});
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full_node.find('a:last').click(function() {
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truncated_node.show(); full_node.hide(); return false;
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});
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});
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}
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// Note that the " (…more)" bit counts towards the max length – so a max
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// length of 10 would truncate "1234567890" to "12 (…more)".
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$.fn.truncate.defaults = {
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max_length: 100,
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more: '+',
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less: '-'
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};
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function recursivelyTruncate(node, max_length) {
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return (node.nodeType == 3) ? truncateText(node, max_length) : truncateNode(node, max_length);
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}
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function truncateNode(node, max_length) {
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var node = $(node);
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var new_node = node.clone().empty();
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var truncatedChild;
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node.contents().each(function() {
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var remaining_length = max_length - new_node.text().length;
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if (remaining_length == 0) return; // breaks the loop
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truncatedChild = recursivelyTruncate(this, remaining_length);
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if (truncatedChild) new_node.append(truncatedChild);
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});
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return new_node;
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}
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function truncateText(node, max_length) {
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var text = squeeze(node.data);
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if (trailing_whitespace) // remove initial whitespace if last text
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text = text.replace(/^ /, ''); // node had trailing whitespace.
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trailing_whitespace = !!text.match(/ $/);
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var text = text.slice(0, max_length);
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// Ensure HTML entities are encoded
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// http://debuggable.com/posts/encode-html-entities-with-jquery:480f4dd6-13cc-4ce9-8071-4710cbdd56cb
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text = $('<div/>').text(text).html();
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return text;
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}
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// Collapses a sequence of whitespace into a single space.
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function squeeze(string) {
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return string.replace(/\s+/g, ' ');
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}
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// Finds the last, innermost block-level element
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function findNodeForMore(node) {
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var $node = $(node);
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var last_child = $node.children(":last");
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if (!last_child) return node;
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var display = last_child.css('display');
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if (!display || display=='inline') return $node;
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return findNodeForMore(last_child);
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};
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// Finds the last child if it's a p; otherwise the parent
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function findNodeForLess(node) {
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var $node = $(node);
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var last_child = $node.children(":last");
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if (last_child && last_child.is('p')) return last_child;
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return node;
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};
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})(jQuery);
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