AJAX Suggest
In the AJAX example below we will demonstrate a poll where the web page can get the result without reloading.
This example consists of four pages:
* a simple HTML form
* a JavaScript
* a PHP page
* a text file to store the results
The HTML Form
This is the HTML page. It contains a simple HTML form and a link to a JavaScript:
<html>
<head>
<script src="poll.js"></script>
</head>
<body>
<div id="poll">
<h2>Do you like PHP and AJAX so far?</h2>
<form>
Yes:
<input type="radio" name="vote"
value="0" onclick="getVote(this.value)">
<br />No:
<input type="radio" name="vote"
value="1" onclick="getVote(this.value)">
</form>
</div>
</body>
</html>
Example Explained - The HTML Form
As you can see, the HTML page above contains a simple HTML form inside a “<div>” with two radio buttons.
The form works like this:
1. An event is triggered when the user selects the “yes” or “no” option
2. When the event is triggered, a function called getVote() is executed.
3. Around the form is a <div> called “poll”. When the data is returned from the getVote() function, the return data will replace the form.
The Text File
The text file (poll_result.txt) is where we store the data from the poll.
It is stored like this:
0||0
The first number represents the “Yes” votes, the second number represents the “No” votes.
Note: Remember to allow your web server to edit the text file. Do NOT give everyone access, just the web server (PHP).
The JavaScript
The JavaScript code is stored in “poll.js” and linked to in the HTML document:
var xmlHttp
function getVote(int)
{
xmlHttp=GetXmlHttpObject()
if (xmlHttp==null)
{
alert ("Browser does not support HTTP Request")
return
}
var url="poll_vote.php"
url=url+"?vote="+int
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("poll").
innerHTML=xmlHttp.responseText;
}
}
function GetXmlHttpObject()
{
var objXMLHttp=null
if (window.XMLHttpRequest)
{
objXMLHttp=new XMLHttpRequest()
}
else if (window.ActiveXObject)
{
objXMLHttp=new ActiveXObject("Microsoft.XMLHTTP")
}
return objXMLHttp
}
Read more: indonesiaweb
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