227 lines
9 KiB
JavaScript
227 lines
9 KiB
JavaScript
/**
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* SearchHighlight plugin for jQuery
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*
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* Thanks to Scott Yang <http://scott.yang.id.au/>
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* for the original idea and some code
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*
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* @author Renato Formato <rformato@gmail.com>
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*
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* @version 0.37 (9/1/2009)
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*
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* Options
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* - exact (string, default:"exact")
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* "exact" : find and highlight the exact words.
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* "whole" : find partial matches but highlight whole words
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* "partial": find and highlight partial matches
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*
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* - tag_name (string, default:'span')
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* The tag that is used to wrap the matched words
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*
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* - style_name (string, default:'hilite')
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* The class given to the tag wrapping the matched words.
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*
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* - style_name_suffix (boolean, default:true)
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* If true a different number is added to style_name for every different matched word.
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*
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* - debug_referrer (string, default:null)
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* Set a referrer for debugging purpose.
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*
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* - engines (array of regex, default:null)
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* Add a new search engine regex to highlight searches coming from new search engines.
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* The first element is the regex to match the domain.
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* The second element is the regex to match the query string.
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* Ex: [/^http:\/\/my\.site\.net/i,/search=([^&]+)/i]
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*
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* - highlight (string, default:null)
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* A jQuery selector or object to set the elements enabled for highlight.
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* If null or no elements are found, all the document is enabled for highlight.
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*
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* - nohighlight (string, default:null)
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* A jQuery selector or object to set the elements not enabled for highlight.
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* This option has priority on highlight.
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*
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* - keys (string, default:null)
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* Disable the analisys of the referrer and search for the words given as argument
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*
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* - min_length (number, default:null)
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* Set the minimun length of a key
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*
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*/
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if (window.jQuery)
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(function($){
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jQuery.fn.SearchHighlight = function(options) {
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var ref = options.debug_referrer || document.referrer;
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if(!ref && options.keys==undefined) return this;
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SearchHighlight.options = $.extend({exact:"exact",tag_name:'span',style_name:'hilite',style_name_suffix:true},options);
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if(options.engines) SearchHighlight.engines.unshift(options.engines);
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var q = SearchHighlight.splitKeywords(options.keys!=undefined?options.keys.toLowerCase():SearchHighlight.decodeURL(ref,SearchHighlight.engines));
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if(q && q.join("")) {
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SearchHighlight.buildReplaceTools(q);
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if(!SearchHighlight.regex) return this;
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return this.each(function(){
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var el = this;
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if(el==document) el = $("body")[0];
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SearchHighlight.hiliteElement(el);
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})
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} else return this;
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};
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var SearchHighlight = {
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options: {},
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regex: null,
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engines: [
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[/^http:\/\/(www\.)?google\./i, /q=([^&]+)/i], // Google
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[/^http:\/\/(www\.)?search\.yahoo\./i, /p=([^&]+)/i], // Yahoo
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[/^http:\/\/(www\.)?search\.msn\./i, /q=([^&]+)/i], // MSN
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[/^http:\/\/(www\.)?search\.live\./i, /query=([^&]+)/i], // MSN Live
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[/^http:\/\/(www\.)?search\.aol\./i, /userQuery=([^&]+)/i], // AOL
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[/^http:\/\/(www\.)?ask\.com/i, /q=([^&]+)/i], // Ask.com
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[/^http:\/\/(www\.)?altavista\./i, /q=([^&]+)/i], // AltaVista
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[/^http:\/\/(www\.)?feedster\./i, /q=([^&]+)/i], // Feedster
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[/^http:\/\/(www\.)?search\.lycos\./i, /q=([^&]+)/i], // Lycos
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[/^http:\/\/(www\.)?alltheweb\./i, /q=([^&]+)/i], // AllTheWeb
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[/^http:\/\/(www\.)?technorati\.com/i, /([^\?\/]+)(?:\?.*)$/i] // Technorati
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],
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subs: {},
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decodeURL: function(URL,reg) {
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//try to properly escape not UTF-8 URI encoded chars
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try {
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URL = decodeURIComponent(URL);
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} catch (e) {
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URL = unescape(URL);
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}
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var query = null;
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$.each(reg,function(i,n){
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if(n[0].test(URL)) {
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var match = URL.match(n[1]);
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if(match) {
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query = match[1].toLowerCase();
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return false;
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}
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}
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});
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return query;
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},
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splitKeywords: function(query) {
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if(query) {
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//do not split keywords enclosed by "
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var m = query.match(/"([^"]*)"/g);
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if(m)
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for(var i=0, ml=m.length;i<ml;i++) {
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var i = query.indexOf(m[i]);
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query = query.substring(0,i)+'@@@'+i+'@@@'+query.substring(i+m[i].length)
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m[i] = decodeURI(m[i]);
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m[i] = m[i].split("+").join(' ');
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}
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query = query.split(/[\s,\+]+/);
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if(m)
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for(var i=0,l = query.length;i<l;i++) {
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for(var j=0, ml=m.length;j<ml;j++) {
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var regex = new RegExp("@@@"+j+"@@@");
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query[i] = query[i].replace(regex,m[j].substring(1,m[j].length-1))
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}
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}
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};
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return query;
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},
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regexAccent : [
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[/[\xC0-\xC5\u0100-\u0105]/ig,'a'],
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[/[\xC7\u0106-\u010D]/ig,'c'],
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[/[\xC8-\xCB]/ig,'e'],
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[/[\xCC-\xCF]/ig,'i'],
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[/[\u0141]/ig,'l'],
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[/\xD1/ig,'n'],
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[/[\xD2-\xD6\xD8]/ig,'o'],
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[/[\u015A-\u0161]/ig,'s'],
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[/[\u0162-\u0167]/ig,'t'],
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[/[\xD9-\xDC]/ig,'u'],
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[/\xFF/ig,'y'],
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[/[\x91\x92\u2018\u2019]/ig,'\'']
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],
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matchAccent : /[\x91\x92\xC0-\xC5\xC7-\xCF\xD1-\xD6\xD8-\xDC\xFF\u0100-\u010D\u0141\u015A-\u0167\u2018\u2019]/ig,
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replaceAccent: function(q) {
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SearchHighlight.matchAccent.lastIndex = 0;
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if(SearchHighlight.matchAccent.test(q)) {
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for(var i=0,l=SearchHighlight.regexAccent.length;i<l;i++)
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q = q.replace(SearchHighlight.regexAccent[i][0],SearchHighlight.regexAccent[i][1]);
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}
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return q;
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},
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escapeRegEx : /((?:\\{2})*)([[\]{}*?|])/g, //the special chars . and + are already gone at this point because they are considered split chars
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buildReplaceTools : function(query) {
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var re = [], regex;
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$.each(query,function(i,n){
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if(!SearchHighlight.options.min_length || n.length>=SearchHighlight.options.min_length)
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if(n = SearchHighlight.replaceAccent(n).replace(SearchHighlight.escapeRegEx,"$1\\$2"))
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re.push(n);
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});
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if(!re.length) return;
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regex = re.join("|");
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switch(SearchHighlight.options.exact) {
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case "exact":
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regex = '\\b(?:'+regex+')\\b';
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break;
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case "whole":
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regex = '\\b\\w*('+regex+')\\w*\\b';
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break;
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}
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SearchHighlight.regex = new RegExp(regex, "gi");
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$.each(re,function(i,n){
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SearchHighlight.subs[n] = SearchHighlight.options.style_name+
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(SearchHighlight.options.style_name_suffix?i+1:'');
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});
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},
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nosearch: /s(?:cript|tyle)|textarea/i,
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hiliteElement: function(el) {
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var opt = SearchHighlight.options, elHighlight, noHighlight;
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elHighlight = opt.highlight?$(opt.highlight):$("body");
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if(!elHighlight.length) elHighlight = $("body");
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noHighlight = opt.nohighlight?$(opt.nohighlight):$([]);
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elHighlight.each(function(){
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SearchHighlight.hiliteTree(this,noHighlight);
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});
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},
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hiliteTree : function(el,noHighlight) {
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if(noHighlight.index(el)!=-1) return;
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var matchIndex = SearchHighlight.options.exact=="whole"?1:0;
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for(var startIndex=0,endIndex=el.childNodes.length;startIndex<endIndex;startIndex++) {
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var item = el.childNodes[startIndex];
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if ( item.nodeType != 8 ) {//comment node
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//text node
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if(item.nodeType==3) {
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var text = item.data, textNoAcc = SearchHighlight.replaceAccent(text);
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var newtext="",match,index=0;
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SearchHighlight.regex.lastIndex = 0;
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while(match = SearchHighlight.regex.exec(textNoAcc)) {
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newtext += SearchHighlight.fixTags(text.substr(index,match.index-index))+'<'+SearchHighlight.options.tag_name+' class="'+
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SearchHighlight.subs[match[matchIndex].toLowerCase()]+'">'+SearchHighlight.fixTags(text.substr(match.index,match[0].length))+"</"+SearchHighlight.options.tag_name+">";
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index = match.index+match[0].length;
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}
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if(newtext) {
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//add the last part of the text
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newtext += SearchHighlight.fixTags(text.substring(index));
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var repl = $.merge([],$("<"+SearchHighlight.options.tag_name+">"+newtext+"</"+SearchHighlight.options.tag_name+">")[0].childNodes);
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endIndex += repl.length-1;
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startIndex += repl.length-1;
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$(item).before(repl).remove();
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}
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} else {
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if(item.nodeType==1 && item.nodeName.search(SearchHighlight.nosearch)==-1)
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SearchHighlight.hiliteTree(item,noHighlight);
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}
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}
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}
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},
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fixTags : function(text) {
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return text.replace("<","<").replace(">",">");
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}
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};
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})(jQuery)
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