resources/jquery/jquery.highlightText.js

   1 /**
   2  * Plugin that highlights matched word partials in a given element
   3  * TODO: add a function for restoring the previous text
   4  * TODO: accept mappings for converting shortcuts like WP: to Wikipedia:
   5  */
   6 ( function( $ ) {
   7
   8 $.highlightText = {
   9
  10         // Split our pattern string at spaces and run our highlight function on the results
  11         splitAndHighlight: function( node, pat ) {
  12                 var patArray = pat.split(" ");
  13                 for ( var i = 0; i < patArray.length; i++ ) {
  14                         if ( patArray[i].length == 0 ) continue;
  15                         $.highlightText.innerHighlight( node, patArray[i] );
  16                 }
  17                 return node;
  18         },
  19         // scans a node looking for the pattern and wraps a span around each match
  20         innerHighlight: function( node, pat ) {
  21                 // if this is a text node
  22                 if ( node.nodeType == 3 ) {
  23                         // TODO - need to be smarter about the character matching here.
  24                         // non latin characters can make regex think a new word has begun: do not use \b
  25                         // http://stackoverflow.com/questions/3787072/regex-wordwrap-with-utf8-characters-in-js
  26                         // look for an occurence of our pattern and store the starting position
  27                         var pos = node.data.search( new RegExp( "(^|\\s)" + $.escapeRE( pat ), "i" ) );
  28                         if ( pos >= 0 ) {
  29                                 // create the span wrapper for the matched text
  30                                 var spannode = document.createElement( 'span' );
  31                                 spannode.className = 'highlight';
  32                                 // shave off the characters preceding the matched text
  33                                 var middlebit = node.splitText( pos );
  34                                 // shave off any unmatched text off the end
  35                                 middlebit.splitText( pat.length );
  36                                 // clone for appending to our span
  37                                 var middleclone = middlebit.cloneNode( true );
  38                                 // append the matched text node to the span
  39                                 spannode.appendChild( middleclone );
  40                                 // replace the matched node, with our span-wrapped clone of the matched node
  41                                 middlebit.parentNode.replaceChild( spannode, middlebit );
  42                         }
  43                 // if this is an element with childnodes, and not a script, style or an element we created
  44                 } else if ( node.nodeType == 1 && node.childNodes && !/(script|style)/i.test( node.tagName )
  45                                 && !( node.tagName.toLowerCase() == 'span' && node.className.match( /\bhighlight/ ) ) ) {
  46                         for ( var i = 0; i < node.childNodes.length; ++i ) {
  47                                 // call the highlight function for each child node
  48                                 $.highlightText.innerHighlight( node.childNodes[i], pat );
  49                         }
  50                 }
  51         }
  52 };
  53
  54 $.fn.highlightText = function( matchString ) {
  55         return $( this ).each( function() {
  56                 var $this = $( this );
  57                 $this.data( 'highlightText', { originalText: $this.text() } );
  58                 $.highlightText.splitAndHighlight( this, matchString );
  59         } );
  60 };
  61
  62 } )( jQuery );
  63