jquery/src/ajax/ajax.js

300 lines
7.8 KiB
JavaScript

// AJAX Plugin
// Docs Here:
// http://jquery.com/docs/ajax/
/**
* Load HTML from a remote file and inject it into the DOM
*/
jQuery.fn.loadIfModified = function( url, params, callback ) {
this.load( url, params, callback, 1 );
};
jQuery.fn.load = function( url, params, callback, ifModified ) {
if ( url.constructor == Function )
return this.bind("load", url);
callback = callback || function(){};
// 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 {
params = jQuery.param( params );
type = "POST";
}
}
var self = this;
// Request the remote document
jQuery.ajax( type, url, params,function(res, status){
if ( status == "success" || !ifModified && status == "notmodified" ) {
// Inject the HTML into all the matched elements
self.html(res.responseText).each( callback, [res.responseText, status] );
// Execute all the scripts inside of the newly-injected HTML
$("script", self).each(function(){
if ( this.src )
$.getScript( this.src );
else
eval.call( window, this.text || this.textContent || this.innerHTML || "" );
});
} else
callback.apply( self, [res.responseText, status] );
}, ifModified);
return this;
};
// 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);
};
};
};
jQuery.extend({
/**
* Load a remote page using a GET request
*/
get: function( url, data, callback, type, ifModified ) {
if ( data.constructor == Function ) {
type = callback;
callback = data;
data = null;
}
if ( data ) url += "?" + jQuery.param(data);
// Build and start the HTTP Request
jQuery.ajax( "GET", url, null, function(r, status) {
if ( callback ) callback( jQuery.httpData(r,type), status );
}, ifModified);
},
getIfModified: function( url, data, callback, type ) {
jQuery.get(url, data, callback, type, 1);
},
getScript: function( url, data, callback ) {
jQuery.get(url, data, callback, "script");
},
/**
* 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, status) {
if ( callback ) callback( jQuery.httpData(r,type), status );
});
},
// timeout (ms)
timeout: 0,
ajaxTimeout: function(timeout) {
jQuery.timeout = timeout;
},
// Last-Modified header cache for next request
lastModified: {},
/**
* A common wrapper for making XMLHttpRequests
*/
ajax: function( type, url, data, ret, ifModified ) {
// 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 the If-Modified-Since header, if ifModified mode.
if ( ifModified )
xml.setRequestHeader("If-Modified-Since",
jQuery.lastModified[url] || "Thu, 01 Jan 1970 00:00:00 GMT" );
// 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
var onreadystatechange = function(istimeout){
// The transfer is complete and the data is available, or the request timed out
if ( xml && (xml.readyState == 4 || istimeout) ) {
var status = jQuery.httpSuccess( xml ) && !istimeout ?
ifModified && jQuery.httpNotModified( xml, url ) ? "notmodified" : "success" : "error";
// Make sure that the request was successful or notmodified
if ( status != "error" ) {
// Cache Last-Modified header, if ifModified mode.
var modRes = xml.getResponseHeader("Last-Modified");
if ( ifModified && modRes ) jQuery.lastModified[url] = modRes;
// If a local callback was specified, fire it
if ( success ) success( xml, status );
// 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, status );
// 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, status);
// Stop memory leaks
xml.onreadystatechange = function(){};
xml = null;
}
};
xml.onreadystatechange = onreadystatechange;
// Timeout checker
if(jQuery.timeout > 0)
setTimeout(function(){
// Check to see if the request is still happening
if (xml) {
// Cancel the request
xml.abort();
// for Opera. Opera does't call onreadystatechange when aborted.
if (xml) onreadystatechange(1);
// Clear from memory
xml = null;
}
}, jQuery.timeout);
// 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;
},
// Determines if an XMLHttpRequest returns NotModified
httpNotModified: function(xml, url) {
try {
var xmlRes = xml.getResponseHeader("Last-Modified");
// Firefox always returns 200. check Last-Modified date
if( xml.status == 304 || xmlRes == jQuery.lastModified[url] ) return true;
} 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 data = !type && ct && ct.indexOf("xml") >= 0;
data = type == "xml" || data ? r.responseXML : r.responseText;
// If the type is "script", eval it
if ( type == "script" ) eval.call( window, data );
return data;
},
// 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("&");
}
});