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<h1>PHP and AJAX Live Search</h1>
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<p class="intro">AJAX can be used for a more user friendly and interactive
search.</p>
<hr>
<h2>AJAX Live Search</h2>
<p>In the AJAX example below we will demonstrate a live search, where the server
gets search results while the user types.</p>
<p>Live search has many benefits compared to traditional searching:</p>
<ul>
<li>Matching results are shown as you type</li>
<li>Results narrow as you continue typing</li>
<li>If results become too narrow, remove characters to see a broader result</li>
</ul>
<hr>
<h2>Search for a W3Schools page in the Box Below<br />
</h2>
<form>
<input type="text" id="txt1" size="30"
onkeyup="showResult(this.value)">
<div id="livesearch"></div>
</form>
</p>
<p>This example consists of four pages:</p>
<ul>
<li>a simple HTML form</li>
<li>a JavaScript</li>
<li>a
PHP page</li>
<li>an XML document</li>
</ul>
<p>In this example the results are found in an XML document (<a target="_blank" href="links.xml">links.xml</a>). To make this
example small and simple, only eight results are available.</p>
<hr>
<h2>The HTML Form</h2>
<p>This is the HTML page. It contains a simple HTML form, style for the form and
a link to a JavaScript:</p>
<table class="ex" id="table11" border="1" width="100%">
<tr>
<td>
<pre><html>
<head>
<script src="livesearch.js"></script>
<style type="text/css">
#livesearch
{
margin:0px;
width:194px;
}
#txt1
{
margin:0px;
}
</style>
</head>
<body></pre>
<pre><form>
<input type="text" id="txt1" size="30"
onkeyup="showResult(this.value)"></pre>
<pre><div id="livesearch"></div>
</form></pre>
<pre></body>
</html></pre>
</td>
</tr>
</table>
<h2>Example Explained - The HTML Form</h2>
<p>As you can see, the HTML page above contains a simple HTML form with an input field called
"txt1".</p>
<p>The form works like this:</p>
<ol>
<li>An event is triggered when the user presses, and releases a key in the
input field</li>
<li>When the event is triggered, a function called showResult() is executed.
</li>
<li>Below the form is a <div> called "livesearch". This is used as a placeholder for
the return data of the showResult() function.</li>
</ol>
<hr>
<h2>The JavaScript</h2>
<p>The JavaScript code is stored in "livesearch.js" and linked to the HTML
document:</p>
<table class="ex" id="table12" border="1" width="100%">
<tr>
<td>
<pre>var xmlHttp</pre>
<pre>function showResult(str)
{
if (str.length==0)
{
document.getElementById("livesearch").
innerHTML="";
document.getElementById("livesearch").
style.border="0px";
return
}</pre>
<pre>xmlHttp=GetXmlHttpObject()</pre>
<pre>if (xmlHttp==null)
{
alert ("Browser does not support HTTP Request")
return
} </pre>
<pre>var url="livesearch.php"
url=url+"?q="+str
url=url+"&sid="+Math.random()
xmlHttp.onreadystatechange=stateChanged
xmlHttp.open("GET",url,true)
xmlHttp.send(null)
}
function stateChanged()
{
if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete")
{
document.getElementById("livesearch").
innerHTML=xmlHttp.responseText;
document.getElementById("livesearch").
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