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=====Highlight Searched-for Text=====

The following code implements a feature that will highlight the search word in the pages that where found by TextSearch or by Google, Yahoo and many other search engines. The core of this feature is a JavaScript library by the name of [[ | searchhi]].

From the searchhi website:
//The searchhi JavaScript library is a way of automatically highlighting words on a page when that page was reached by a search engine. In essence, if you search, for example, Google for some words, and then follow a link from the search results to a searchhi enabled page, the words you searched for will be highlighted on that page.//

First I had to make a few minor changes to this JavaScript libary. This to make it aware of the TextSearch activity.
The resulting file (searchhi.js) is then copied in the //3rdparty/plugins/searchhi// directory. Also make sure that your create a **.htaccess** file in the same directory with the following content:
<IfModule mod_rewrite.c>
RewriteEngine off

Then copy the **searchhi.js** file into the //3rdparty/plugins/searchhi// directory.
/* */
/* Modified 20021006 to fix query string parsing and add case insensitivity */
function highlightWord(node,word) {
// Iterate into this nodes childNodes
if (node.hasChildNodes) {
var hi_cn;
for (hi_cn=0;hi_cn<node.childNodes.length;hi_cn++) {

// And do this node itself
if (node.nodeType == 3) { // text node
tempNodeVal = node.nodeValue.toLowerCase();
tempWordVal = word.toLowerCase();
if (tempNodeVal.indexOf(tempWordVal) != -1) {
pn = node.parentNode;
if (pn.className != "searchword") {
// word has not already been highlighted!
nv = node.nodeValue;
ni = tempNodeVal.indexOf(tempWordVal);
// Create a load of replacement nodes
before = document.createTextNode(nv.substr(0,ni));
docWordVal = nv.substr(ni,word.length);
after = document.createTextNode(nv.substr(ni+word.length));
hiwordtext = document.createTextNode(docWordVal);
hiword = document.createElement("span");
hiword.className = "searchword";

function SearchHighlight() {
if (!document.createElement) return;
ref = document.referrer;
if (ref.indexOf('?') == -1) return;
qs = ref.substr(ref.indexOf('?')+1);
qsa = qs.split('&');
for (i=0;i<qsa.length;i++) {
qsip = qsa[i].split('=');
if (qsip.length == 1) continue;
if (qsip[0] == 'q' || qsip[0] == 'p' || qsip[0] == 'phrase') { // q= for Google, p= for Yahoo, phrase for wikka
words = unescape(qsip[1].replace(/\+/g,' ')).split(/\s+/);
for (w=0;w<words.length;w++) {

window.onload = SearchHighlight;

Now all that rest us is two small changes to the **wikka.css** file and to the **header.php** action.

In **css/wikka.css** add the following lines:
/* ##### searchhi plugin ##### */

.searchword {
background-color: yellow;

In the **actions/header.php** file add the following code just before the **</HEAD>** tag:
<script src="3rdparty/plugins/searchhi/searchhi.js" type="text/javascript"></script>

It is installed on [[ | my Wikka]] so you can see for yourself how it works.

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