/* * This is the function that actually highlights a text string by * adding HTML tags before and after all occurrences of the search * term. You can pass your own tags if you'd like, or if the * highlightStartTag or highlightEndTag parameters are omitted or * are empty strings then the default tags will be used. */ function doHighlight(bodyText, searchTerm, highlightStartTag, highlightEndTag) { // the highlightStartTag and highlightEndTag parameters are optional if ((!highlightStartTag) || (!highlightEndTag)) { highlightStartTag = ""; highlightEndTag = ""; } // find all occurences of the search term in the given text, // and add some "highlight" tags to them (we're not using a // regular expression search, because we want to filter out // matches that occur within HTML tags and script blocks, so // we have to do a little extra validation) var newText = ""; var i = -1; var lcSearchTerm = searchTerm.toLowerCase(); var lcBodyText = bodyText.toLowerCase(); while (bodyText.length > 0) { i = lcBodyText.indexOf(lcSearchTerm, i+1); if (i < 0) { newText += bodyText; bodyText = ""; } else { // skip anything inside an HTML tag if (bodyText.lastIndexOf(">", i) >= bodyText.lastIndexOf("<", i)) { // skip anything inside a