jquery/ajax/ajax.js

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2006-03-22 03:33:07 +00:00
// AJAX Plugin
// Docs Here:
// http://jquery.com/docs/ajax/
/**
* Load HTML from a remote file and inject it into the DOM
*/
jQuery.fn.load = function( url, params, callback ) {
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// I overwrote the event plugin's .load
// this won't happen again, I hope -John
if ( url && url.constructor == Function )
return this.bind("load", url);
// Default to a GET request
var type = "GET";
// If the second parameter was provided
if ( params ) {
// If it's a function
if ( params.constructor == Function ) {
// We assume that it's the callback
callback = params;
params = null;
// Otherwise, build a param string
} else {
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params = jQuery.param( params );
type = "POST";
}
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}
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var self = this;
// Request the remote document
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jQuery.ajax( type, url, params,function(res){
// Inject the HTML into all the matched elements
self.html(res.responseText).each(function(){
// If a callback function was provided
if ( callback && callback.constructor == Function )
// Execute it within the context of the element
callback.apply( self, [res.responseText] );
});
// Execute all the scripts inside of the newly-injected HTML
$("script", self).each(function(){
eval( this.text || this.textContent || this.innerHTML || "");
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});
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});
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return this;
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};
// If IE is used, create a wrapper for the XMLHttpRequest object
if ( jQuery.browser.msie )
XMLHttpRequest = function(){
return new ActiveXObject(
navigator.userAgent.indexOf("MSIE 5") >= 0 ?
"Microsoft.XMLHTTP" : "Msxml2.XMLHTTP"
);
};
// Attach a bunch of functions for handling common AJAX events
new function(){
var e = "ajaxStart,ajaxStop,ajaxComplete,ajaxError,ajaxSuccess".split(',');
for ( var i = 0; i < e.length; i++ ) new function(){
var o = e[i];
jQuery.fn[o] = function(f){
return this.bind(o, f);
};
}
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};
jQuery.extend({
/**
* Load a remote page using a GET request
*/
get: function( url, data, callback, type ) {
if ( data.constructor == Function ) {
callback = data;
data = null;
}
if ( data )
url += "?" + jQuery.param(data);
// Build and start the HTTP Request
jQuery.ajax( "GET", url, null, function(r) {
if ( callback ) callback( jQuery.httpData(r,type) );
});
},
/**
* Load a remote page using a POST request.
*/
post: function( url, data, callback, type ) {
// Build and start the HTTP Request
jQuery.ajax( "POST", url, jQuery.param(data), function(r) {
if ( callback ) callback( jQuery.httpData(r,type) );
});
},
/**
* A common wrapper for making XMLHttpRequests
*/
ajax: function( type, url, data, ret ) {
// If only a single argument was passed in,
// assume that it is a object of key/value pairs
if ( !url ) {
ret = type.complete;
var success = type.success;
var error = type.error;
data = type.data;
url = type.url;
type = type.type;
}
// Watch for a new set of requests
if ( ! jQuery.active++ )
jQuery.event.trigger( "ajaxStart" );
// Create the request object
var xml = new XMLHttpRequest();
// Open the socket
xml.open(type || "GET", url, true);
// Set the correct header, if data is being sent
if ( data )
xml.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
// Set header so calling script knows that it's an XMLHttpRequest
xml.setRequestHeader("X-Requested-With", "XMLHttpRequest");
// Make sure the browser sends the right content length
if ( xml.overrideMimeType )
xml.setRequestHeader("Connection", "close");
// Wait for a response to come back
xml.onreadystatechange = function(){
// The transfer is complete and the data is available
if ( xml.readyState == 4 ) {
// Make sure that the request was successful
if ( jQuery.httpSuccess( xml ) ) {
// If a local callback was specified, fire it
if ( success ) success( xml );
// Fire the global callback
jQuery.event.trigger( "ajaxSuccess" );
// Otherwise, the request was not successful
} else {
// If a local callback was specified, fire it
if ( error ) error( xml );
// Fire the global callback
jQuery.event.trigger( "ajaxError" );
}
// The request was completed
jQuery.event.trigger( "ajaxComplete" );
// Handle the global AJAX counter
if ( ! --jQuery.active )
jQuery.event.trigger( "ajaxStop" );
// Process result
if ( ret ) ret(xml);
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// Stop memory leaks
xml.onreadystatechange = function(){};
xml = null;
}
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};
// Send the data
xml.send(data);
},
// Counter for holding the number of active queries
active: 0,
// Determines if an XMLHttpRequest was successful or not
httpSuccess: function(r) {
try {
return r.status ?
( r.status >= 200 && r.status < 300 ) || r.status == 304 :
location.protocol == "file:";
} catch(e){}
return false;
},
// Get the data out of an XMLHttpRequest.
// Return parsed XML if content-type header is "xml" and type is "xml" or omitted,
// otherwise return plain text.
httpData: function(r,type) {
var ct = r.getResponseHeader("content-type");
var xml = ( !type || type == "xml" ) && ct && ct.indexOf("xml") >= 0;
return xml ? r.responseXML : r.responseText;
},
// Serialize an array of form elements or a set of
// key/values into a query string
param: function(a) {
var s = [];
// If an array was passed in, assume that it is an array
// of form elements
if ( a.constructor == Array )
// Serialize the form elements
for ( var i = 0; i < a.length; i++ )
s.push( a[i].name + "=" + encodeURIComponent( a[i].value ) );
// Otherwise, assume that it's an object of key/value pairs
else
// Serialize the key/values
for ( var j in a )
s.push( j + "=" + encodeURIComponent( a[j] ) );
// Return the resulting serialization
return s.join("&");
}
});