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/**
* Plugin that highlights matched word partials in a given element
* TODO: add a function for restoring the previous text
* TODO: accept mappings for converting shortcuts like WP: to Wikipedia:
*/
( function( $ ) {
$.highlightText = {
// Split our pattern string at spaces and run our highlight function on the results
splitAndHighlight: function( node, pat ) {
var patArray = pat.split(" ");
for ( var i = 0; i < patArray.length; i++ ) {
if ( patArray[i].length == 0 ) continue;
$.highlightText.innerHighlight( node, patArray[i] );
}
return node;
},
// scans a node looking for the pattern and wraps a span around each match
innerHighlight: function( node, pat ) {
// if this is a text node
if ( node.nodeType == 3 ) {
// TODO - need to be smarter about the character matching here.
// non latin characters can make regex think a new word has begun: do not use \b
// http://stackoverflow.com/questions/3787072/regex-wordwrap-with-utf8-characters-in-js
// look for an occurence of our pattern and store the starting position
var match = node.data.match( new RegExp( "(^|\\s)" + $.escapeRE( pat ), "i" ) );
if ( match ) {
var pos = match.index + match[1].length; // include length of any matched spaces
// create the span wrapper for the matched text
var spannode = document.createElement( 'span' );
spannode.className = 'highlight';
// shave off the characters preceding the matched text
var middlebit = node.splitText( pos );
// shave off any unmatched text off the end
middlebit.splitText( pat.length );
// clone for appending to our span
var middleclone = middlebit.cloneNode( true );
// append the matched text node to the span
spannode.appendChild( middleclone );
// replace the matched node, with our span-wrapped clone of the matched node
middlebit.parentNode.replaceChild( spannode, middlebit );
}
// if this is an element with childnodes, and not a script, style or an element we created
} else if ( node.nodeType == 1 && node.childNodes && !/(script|style)/i.test( node.tagName )
&& !( node.tagName.toLowerCase() == 'span' && node.className.match( /\bhighlight/ ) ) ) {
for ( var i = 0; i < node.childNodes.length; ++i ) {
// call the highlight function for each child node
$.highlightText.innerHighlight( node.childNodes[i], pat );
}
}
}
};
$.fn.highlightText = function( matchString ) {
return $( this ).each( function() {
var $this = $( this );
$this.data( 'highlightText', { originalText: $this.text() } );
$.highlightText.splitAndHighlight( this, matchString );
} );
};
} )( jQuery );
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