jquery/src/ajax.js

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jQuery.fn.extend({
load: function( url, params, callback ) {
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if ( jQuery.isFunction( url ) )
return this.bind("load", url);
var off = url.indexOf(" ");
if ( off >= 0 ) {
var selector = url.slice(off, url.length);
url = url.slice(0, off);
}
callback = callback || function(){};
// Default to a GET request
var type = "GET";
// If the second parameter was provided
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if ( params )
// If it's a function
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if ( jQuery.isFunction( params ) ) {
// We assume that it's the callback
callback = params;
params = null;
// Otherwise, build a param string
} else {
params = jQuery.param( params );
type = "POST";
}
var self = this;
// Request the remote document
jQuery.ajax({
url: url,
type: type,
data: params,
complete: function(res, status){
// If successful, inject the HTML into all the matched elements
if ( status == "success" || status == "notmodified" )
// See if a selector was specified
self.html( selector ?
// Create a dummy div to hold the results
jQuery("<div/>")
// inject the contents of the document in, removing the scripts
// to avoid any 'Permission Denied' errors in IE
.append(res.responseText.replace(/<script(.|\s)*?\/script>/g, ""))
// Locate the specified elements
.find(selector) :
// If not, just inject the full result
res.responseText );
// Add delay to account for Safari's delay in globalEval
setTimeout(function(){
self.each( callback, [res.responseText, status, res] );
}, 13);
}
});
return this;
},
serialize: function() {
return jQuery.param(this.serializeArray());
},
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serializeArray: function() {
return this.map(function(){
return jQuery.nodeName(this, "form") ?
jQuery.makeArray(this.elements) : this;
})
.filter(function(){
return this.name && !this.disabled &&
(this.checked || /select|textarea/i.test(this.nodeName) ||
/text|hidden|password/i.test(this.type));
})
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.map(function(i, elem){
var val = jQuery(this).val();
return val == null ? null :
val.constructor == Array ?
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jQuery.map( val, function(i, val){
return {name: elem.name, value: val};
}) :
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{name: elem.name, value: val};
}).get();
}
});
// Attach a bunch of functions for handling common AJAX events
jQuery.each( "ajaxStart,ajaxStop,ajaxComplete,ajaxError,ajaxSuccess,ajaxSend".split(","), function(i,o){
jQuery.fn[o] = function(f){
return this.bind(o, f);
};
});
var jsc = (new Date).getTime();
jQuery.extend({
get: function( url, data, callback, type ) {
// shift arguments if data argument was ommited
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if ( jQuery.isFunction( data ) ) {
callback = data;
data = null;
}
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return jQuery.ajax({
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type: "GET",
url: url,
data: data,
success: callback,
dataType: type
});
},
getScript: function( url, callback ) {
return jQuery.get(url, null, callback, "script");
},
getJSON: function( url, data, callback ) {
return jQuery.get(url, data, callback, "json");
},
post: function( url, data, callback, type ) {
if ( jQuery.isFunction( data ) ) {
callback = data;
data = {};
}
return jQuery.ajax({
type: "POST",
url: url,
data: data,
success: callback,
dataType: type
});
},
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ajaxSetup: function( settings ) {
jQuery.extend( jQuery.ajaxSettings, settings );
},
ajaxSettings: {
global: true,
type: "GET",
timeout: 0,
contentType: "application/x-www-form-urlencoded",
processData: true,
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async: true,
data: null
},
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// Last-Modified header cache for next request
lastModified: {},
ajax: function( s ) {
var jsonp, jsre = /=(\?|%3F)/g, status, data;
// Extend the settings, but re-extend 's' so that it can be
// checked again later (in the test suite, specifically)
s = jQuery.extend(true, s, jQuery.extend(true, {}, jQuery.ajaxSettings, s));
// convert data if not already a string
if ( s.data && s.processData && typeof s.data != "string" )
s.data = jQuery.param(s.data);
// Break the data into one single string
var q = s.url.indexOf("?");
if ( q > -1 ) {
s.data = (s.data ? s.data + "&" : "") + s.url.slice(q + 1);
s.url = s.url.slice(0, q);
}
// Handle JSONP Parameter Callbacks
if ( s.dataType == "jsonp" ) {
if ( !s.data || !s.data.match(jsre) )
s.data = (s.data ? s.data + "&" : "") + (s.jsonp || "callback") + "=?";
s.dataType = "json";
}
// Build temporary JSONP function
if ( s.dataType == "json" && s.data && s.data.match(jsre) ) {
jsonp = "jsonp" + jsc++;
s.data = s.data.replace(jsre, "=" + jsonp);
// We need to make sure
// that a JSONP style response is executed properly
s.dataType = "script";
// Handle JSONP-style loading
window[ jsonp ] = function(tmp){
data = tmp;
success();
// Garbage collect
window[ jsonp ] = undefined;
try{ delete window[ jsonp ]; } catch(e){}
};
}
if ( s.dataType == "script" && s.cache == null )
s.cache = false;
if ( s.cache === false && s.type.toLowerCase() == "get" )
s.data = (s.data ? s.data + "&" : "") + "_=" + (new Date()).getTime();
// If data is available, append data to url for get requests
if ( s.data && s.type.toLowerCase() == "get" ) {
s.url += "?" + s.data;
// IE likes to send both get and post data, prevent this
s.data = null;
}
// Watch for a new set of requests
if ( s.global && ! jQuery.active++ )
jQuery.event.trigger( "ajaxStart" );
// If we're requesting a remote document
// and trying to load JSON or Script
if ( !s.url.indexOf("http") && s.dataType == "script" ) {
var head = document.getElementsByTagName("head")[0];
var script = document.createElement("script");
script.src = s.url;
// Handle Script loading
if ( !jsonp && (s.success || s.complete) ) {
var done = false;
// Attach handlers for all browsers
script.onload = script.onreadystatechange = function(){
if ( !done && (!this.readyState ||
this.readyState == "loaded" || this.readyState == "complete") ) {
done = true;
success();
complete();
head.removeChild( script );
}
};
}
head.appendChild(script);
// We handle everything using the script element injection
return;
}
var requestDone = false;
// Create the request object; Microsoft failed to properly
// implement the XMLHttpRequest in IE7, so we use the ActiveXObject when it is available
var xml = window.ActiveXObject ? new ActiveXObject("Microsoft.XMLHTTP") : new XMLHttpRequest();
// Open the socket
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xml.open(s.type, s.url, s.async);
// Set the correct header, if data is being sent
if ( s.data )
xml.setRequestHeader("Content-Type", s.contentType);
// Set the If-Modified-Since header, if ifModified mode.
if ( s.ifModified )
xml.setRequestHeader("If-Modified-Since",
jQuery.lastModified[s.url] || "Thu, 01 Jan 1970 00:00:00 GMT" );
// Set header so the called script knows that it's an XMLHttpRequest
xml.setRequestHeader("X-Requested-With", "XMLHttpRequest");
// Allow custom headers/mimetypes
if ( s.beforeSend )
s.beforeSend(xml);
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if ( s.global )
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jQuery.event.trigger("ajaxSend", [xml, s]);
// Wait for a response to come back
var onreadystatechange = function(isTimeout){
// The transfer is complete and the data is available, or the request timed out
if ( !requestDone && xml && (xml.readyState == 4 || isTimeout == "timeout") ) {
requestDone = true;
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// clear poll interval
if (ival) {
clearInterval(ival);
ival = null;
}
status = isTimeout == "timeout" && "timeout" ||
!jQuery.httpSuccess( xml ) && "error" ||
s.ifModified && jQuery.httpNotModified( xml, s.url ) && "notmodified" ||
"success";
if ( status == "success" ) {
// Watch for, and catch, XML document parse errors
try {
// process the data (runs the xml through httpData regardless of callback)
data = jQuery.httpData( xml, s.dataType );
} catch(e) {
status = "parsererror";
}
}
// Make sure that the request was successful or notmodified
if ( status == "success" ) {
// Cache Last-Modified header, if ifModified mode.
var modRes;
try {
modRes = xml.getResponseHeader("Last-Modified");
} catch(e) {} // swallow exception thrown by FF if header is not available
if ( s.ifModified && modRes )
jQuery.lastModified[s.url] = modRes;
// JSONP handles its own success callback
if ( !jsonp )
success();
} else
jQuery.handleError(s, xml, status);
// Fire the complete handlers
complete();
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// Stop memory leaks
if ( s.async )
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xml = null;
}
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};
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if ( s.async ) {
// don't attach the handler to the request, just poll it instead
var ival = setInterval(onreadystatechange, 13);
// Timeout checker
if ( s.timeout > 0 )
setTimeout(function(){
// Check to see if the request is still happening
if ( xml ) {
// Cancel the request
xml.abort();
if( !requestDone )
onreadystatechange( "timeout" );
}
}, s.timeout);
}
// Send the data
try {
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xml.send(s.data);
} catch(e) {
jQuery.handleError(s, xml, null, e);
}
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// firefox 1.5 doesn't fire statechange for sync requests
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if ( !s.async )
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onreadystatechange();
// return XMLHttpRequest to allow aborting the request etc.
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return xml;
function success(){
// If a local callback was specified, fire it and pass it the data
if ( s.success )
s.success( data, status );
// Fire the global callback
if ( s.global )
jQuery.event.trigger( "ajaxSuccess", [xml, s] );
}
function complete(){
// Process result
if ( s.complete )
s.complete(xml, status);
// The request was completed
if ( s.global )
jQuery.event.trigger( "ajaxComplete", [xml, s] );
// Handle the global AJAX counter
if ( s.global && ! --jQuery.active )
jQuery.event.trigger( "ajaxStop" );
}
},
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handleError: function( s, xml, status, e ) {
// If a local callback was specified, fire it
if ( s.error ) s.error( xml, status, e );
// Fire the global callback
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if ( s.global )
jQuery.event.trigger( "ajaxError", [xml, s, e] );
},
// Counter for holding the number of active queries
active: 0,
// Determines if an XMLHttpRequest was successful or not
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httpSuccess: function( r ) {
try {
return !r.status && location.protocol == "file:" ||
( r.status >= 200 && r.status < 300 ) || r.status == 304 ||
jQuery.browser.safari && r.status == undefined;
} catch(e){}
return false;
},
// Determines if an XMLHttpRequest returns NotModified
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httpNotModified: function( xml, url ) {
try {
var xmlRes = xml.getResponseHeader("Last-Modified");
// Firefox always returns 200. check Last-Modified date
return xml.status == 304 || xmlRes == jQuery.lastModified[url] ||
jQuery.browser.safari && xml.status == undefined;
} catch(e){}
return false;
},
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httpData: function( r, type ) {
var ct = r.getResponseHeader("content-type");
var xml = type == "xml" || !type && ct && ct.indexOf("xml") >= 0;
var data = xml ? r.responseXML : r.responseText;
if ( xml && data.documentElement.tagName == "parsererror" )
throw "parsererror";
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// If the type is "script", eval it in global context
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if ( type == "script" )
jQuery.globalEval( data );
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// Get the JavaScript object, if JSON is used.
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if ( type == "json" )
data = eval("(" + data + ")");
return data;
},
// Serialize an array of form elements or a set of
// key/values into a query string
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param: function( a ) {
var s = [];
// If an array was passed in, assume that it is an array
// of form elements
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if ( a.constructor == Array || a.jquery )
// Serialize the form elements
jQuery.each( a, function(){
s.push( encodeURIComponent(this.name) + "=" + encodeURIComponent( this.value ) );
});
// Otherwise, assume that it's an object of key/value pairs
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else
// Serialize the key/values
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for ( var j in a )
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// If the value is an array then the key names need to be repeated
if ( a[j] && a[j].constructor == Array )
jQuery.each( a[j], function(){
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s.push( encodeURIComponent(j) + "=" + encodeURIComponent( this ) );
});
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else
s.push( encodeURIComponent(j) + "=" + encodeURIComponent( a[j] ) );
// Return the resulting serialization
return s.join("&").replace(/%20/g, "+");
}
});