ajax-class
Code (php)
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<title>AJAX</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<script type="text/javascript">
function AjaxObject()
{
// Init the HTTPREQUEST
function funcInitHttpRequest()
{
if(window.XMLHttpRequest) // Mozilla, Safari, etc
{
try
{
oHttpRequest = new XMLHttpRequest();
if(oHttpRequest.overrideMimeType)
{
oHttpRequest.overrideMimeType('text/xml');
}
}
catch(e)
{
oHttpRequest = null;
}
}
else if(window.ActiveXObject) // Internet Explorer
{
try
{
oHttpRequest = new ActiveXObject('Msxml2.XMLHTTP');
}
catch(e)
{
try
{
oHttpRequest = new ActiveXObject('Microsoft.XMLHTTP');
}
catch(e)
{
oHttpRequest = null;
}
}
}
}
// See if AJAX is available
function funcIsAjaxEnabled()
{
if(oHttpRequest == null)
{
return false;
}
return true;
}
// See if an error occured
function funcIsErrorResponse()
{
if(funcIsAjaxEnabled())
{
if(oHttpRequest.readyState == 4)
{
if((oHttpRequest.status != 200))
{
return true;
}
}
}
return false;
}
// See if a valid response was recieved
function funcIsValidResponse()
{
if(funcIsAjaxEnabled())
{
if(oHttpRequest.readyState == 4)
{
if((oHttpRequest.status == 200))
{
return true;
}
}
}
return false;
}
// Return the response as a string
function funcGetResponseAsText()
{
if(funcIsValidResponse()) // A valid responce was recieved.
{
return oHttpRequest.responseText;
}
return '';
}
// Get the current state of the AJAX object
function funcGetState()
{
if(funcIsAjaxEnabled())
{
return oHttpRequest.readyState;
}
return 0;
}
// Get the current status of the AJAX object
function funcGetStatus()
{
if(funcIsAjaxEnabled())
{
return oHttpRequest.status;
}
return 0;
}
// Try to send a new request (url + return function)
function funcSendRequest(sUrl, sFunction)
{
if(funcIsAjaxEnabled())
{
try
{
oHttpRequest.onreadystatechange = sFunction;
oHttpRequest.open('GET', sUrl, true);
oHttpRequest.send(null);
return true;
}
catch(e)
{
alert('Cannot open URL: ' + sUrl);
}
}
else
{
alert('AJAX not available.');
}
return false;
}
// A reference to the HttpRequest object
var oHttpRequest = null;
// Define class methods
this.enabled = funcIsAjaxEnabled;
this.error = funcIsErrorResponse;
this.request = funcSendRequest;
this.response = funcIsValidResponse;
this.state = funcGetState;
this.status = funcGetStatus;
this.text = funcGetResponseAsText;
// Init oHttpRequest
funcInitHttpRequest();
}
// My function to catch the ajax response
function catchAjaxResponse()
{
if(oAjax.response()) // See if a valid response was returned
{
document.getElementById('ajax_result_text').innerHTML = escapeHtml(oAjax.text());
}
else if(oAjax.error()) // An error then?
{
alert('An error occured while retrieving data. Please ensure that the requested url is valid.');
}
}
// Function to escape HTML chars: &, <, >, "
function escapeHtml(string)
{
string = string.replace(/[&]/g, '&');
string = string.replace(/[<]/g, '<');
string = string.replace(/[>]/g, '>');
string = string.replace(/[\"]/g, '"');
return string;
}
// Function to load a new URL
function loadUrl()
{
var url = document.getElementById('url').value;
oAjax.request(url, catchAjaxResponse);
}
var oAjax = new AjaxObject();
</script>
</head>
<body>
<p>Laad een URL met AJAX</p>
<table border="0" cellpadding="5" cellspacing="0"><tr><td align="left" valign="top">Url</td><td align="left" valign="top"><input id="url" name="url" size="60" value="http://"></td><td align="left" valign="top"><input onclick="javascript: loadUrl();" type="button" value="load"></td></tr></table>
<hr>
<pre id="ajax_result_text">
</pre>
</body>
</html>
<html>
<head>
<title>AJAX</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<script type="text/javascript">
function AjaxObject()
{
// Init the HTTPREQUEST
function funcInitHttpRequest()
{
if(window.XMLHttpRequest) // Mozilla, Safari, etc
{
try
{
oHttpRequest = new XMLHttpRequest();
if(oHttpRequest.overrideMimeType)
{
oHttpRequest.overrideMimeType('text/xml');
}
}
catch(e)
{
oHttpRequest = null;
}
}
else if(window.ActiveXObject) // Internet Explorer
{
try
{
oHttpRequest = new ActiveXObject('Msxml2.XMLHTTP');
}
catch(e)
{
try
{
oHttpRequest = new ActiveXObject('Microsoft.XMLHTTP');
}
catch(e)
{
oHttpRequest = null;
}
}
}
}
// See if AJAX is available
function funcIsAjaxEnabled()
{
if(oHttpRequest == null)
{
return false;
}
return true;
}
// See if an error occured
function funcIsErrorResponse()
{
if(funcIsAjaxEnabled())
{
if(oHttpRequest.readyState == 4)
{
if((oHttpRequest.status != 200))
{
return true;
}
}
}
return false;
}
// See if a valid response was recieved
function funcIsValidResponse()
{
if(funcIsAjaxEnabled())
{
if(oHttpRequest.readyState == 4)
{
if((oHttpRequest.status == 200))
{
return true;
}
}
}
return false;
}
// Return the response as a string
function funcGetResponseAsText()
{
if(funcIsValidResponse()) // A valid responce was recieved.
{
return oHttpRequest.responseText;
}
return '';
}
// Get the current state of the AJAX object
function funcGetState()
{
if(funcIsAjaxEnabled())
{
return oHttpRequest.readyState;
}
return 0;
}
// Get the current status of the AJAX object
function funcGetStatus()
{
if(funcIsAjaxEnabled())
{
return oHttpRequest.status;
}
return 0;
}
// Try to send a new request (url + return function)
function funcSendRequest(sUrl, sFunction)
{
if(funcIsAjaxEnabled())
{
try
{
oHttpRequest.onreadystatechange = sFunction;
oHttpRequest.open('GET', sUrl, true);
oHttpRequest.send(null);
return true;
}
catch(e)
{
alert('Cannot open URL: ' + sUrl);
}
}
else
{
alert('AJAX not available.');
}
return false;
}
// A reference to the HttpRequest object
var oHttpRequest = null;
// Define class methods
this.enabled = funcIsAjaxEnabled;
this.error = funcIsErrorResponse;
this.request = funcSendRequest;
this.response = funcIsValidResponse;
this.state = funcGetState;
this.status = funcGetStatus;
this.text = funcGetResponseAsText;
// Init oHttpRequest
funcInitHttpRequest();
}
// My function to catch the ajax response
function catchAjaxResponse()
{
if(oAjax.response()) // See if a valid response was returned
{
document.getElementById('ajax_result_text').innerHTML = escapeHtml(oAjax.text());
}
else if(oAjax.error()) // An error then?
{
alert('An error occured while retrieving data. Please ensure that the requested url is valid.');
}
}
// Function to escape HTML chars: &, <, >, "
function escapeHtml(string)
{
string = string.replace(/[&]/g, '&');
string = string.replace(/[<]/g, '<');
string = string.replace(/[>]/g, '>');
string = string.replace(/[\"]/g, '"');
return string;
}
// Function to load a new URL
function loadUrl()
{
var url = document.getElementById('url').value;
oAjax.request(url, catchAjaxResponse);
}
var oAjax = new AjaxObject();
</script>
</head>
<body>
<p>Laad een URL met AJAX</p>
<table border="0" cellpadding="5" cellspacing="0"><tr><td align="left" valign="top">Url</td><td align="left" valign="top"><input id="url" name="url" size="60" value="http://"></td><td align="left" valign="top"><input onclick="javascript: loadUrl();" type="button" value="load"></td></tr></table>
<hr>
<pre id="ajax_result_text">
</pre>
</body>
</html>