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250 lines
19 KiB
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
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<html>
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<head>
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<title>YUI Library Examples: Connection Manager: Cross-Domain Transactions with Connection Manager</title>
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<meta http-equiv="content-type" content="text/html; charset=utf-8">
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<link rel="stylesheet" type="text/css" href="../../assets/yui.css" >
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<style>
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/*Supplemental CSS for the YUI distribution*/
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#custom-doc { width: 95%; min-width: 950px; }
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#pagetitle {background-image: url(../../assets/bg_hd.gif);}
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</style>
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<link rel="stylesheet" type="text/css" href="../../assets/dpSyntaxHighlighter.css">
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<!--Script and CSS includes for YUI dependencies on this page-->
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<link rel="stylesheet" type="text/css" href="../../build/logger/assets/skins/sam/logger.css" />
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<link rel="stylesheet" type="text/css" href="../../build/button/assets/skins/sam/button.css" />
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<script type="text/javascript" src="../../build/yuiloader/yuiloader-min.js"></script>
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<!--there is no custom header content for this example-->
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<script type="text/javascript">
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//enable passthrough of errors from YUI Event:
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if ((typeof YAHOO !== "undefined") && (YAHOO.util) && (YAHOO.util.Event)) {
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YAHOO.util.Event.throwErrors = true;
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}
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</script>
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</head>
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<body id="yahoo-com" class="yui-skin-sam">
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<div id="custom-doc" class="yui-t2">
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<div id="hd">
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<div id="ygunav">
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<p><em><a href="http://developer.yahoo.com/yui/">YUI Library Home</a></em></p>
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<form action="http://search.yahoo.com/search" id="sitesearchform">
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<input name="vs" type="hidden" value="developer.yahoo.com">
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<input name="vs" type="hidden" value="yuiblog.com">
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<div id="sitesearch">
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<label for="searchinput">Site Search (YDN & YUIBlog): </label>
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<input type="text" id="searchinput" name="p">
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<input type="submit" value="Search" id="searchsubmit" class="ygbt">
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</div>
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</form> </div>
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<div id="ygma"><a href="../../"><img src="../../assets/yui.gif" border="0" height="38"></a></div>
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<div id="pagetitle"><h1>YUI Library Examples: Connection Manager: Cross-Domain Transactions with Connection Manager</h1></div>
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</div>
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<div id="bd">
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<div id="yui-main">
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<div class="yui-b">
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<div class="yui-ge">
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<div class="yui-u first example">
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<div class="promo">
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<h1>Connection Manager: Cross-Domain Transactions with Connection Manager</h1>
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<div class="exampleIntro">
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<p>This example demonstrates how to use <a href="http://developer.yahoo.com/yui/connection/">Connection Manager</a> to make a cross-domain request using the alternate Flash transport. In this example, a request will be made to Yahoo! Pipes, which will respond with JSON data, completing the transaction.</p>
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</div>
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<div class="example-container module newWindow">
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<div id="example-canvas" class="bd">
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<p class="newWindowButton yui-skin-sam"><span id="newWindowLink"><span class="first-child"><a href="xdr_source.html" target="_blank">View example in new window.</a></span></span>
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</div>
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</div>
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</div>
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<h2 class="first">Cross-Domain Requests with Connection Manager</h2>
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<p>Load the <a href="http://developer.yahoo.com/yui/yahoo/">Yahoo Global Object</a>, <a href="http://developer.yahoo.com/yui/connection/">Connection Manager</a>, and its <a href="http://developer.yahoo.com/yui/event/">Event</a> dependency. This example also makes use of the <a href="http://developer.yahoo.com/yui/json/">JSON</a> utility.</p>
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<textarea name="code" class="JScript" cols="60" rows="1">
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<script src="yahoo.js">
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<script src="event.js">
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<script src="json.js">
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<script src="connection.js">
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</textarea>
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<h3>Initialize the Flash Transport</h3>
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<p>
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Before making a cross-domain request, the underlying transport -- <code>connection.swf</code> must be initialized. This is done by calling the transport() on <code>YAHOO.util.Connect</code>, and setting the parameter as the path to the swf, relative to the HTML.
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</p>
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<textarea name="code" class="JScript" cols="60" rows="1">
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YAHOO.util.Connect.transport('connection.swf');
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</textarea>
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<p>
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Once the transport has initialized, it will fire xdrReadyEvent. Attach a listener to this event, so we know when the transport is ready for use. Here, the button to send the cross-domain request is disabled until the transport fires xdrReadyEvent.
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</p>
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<textarea name="code" class="JScript" cols="60" rows="1">
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//Enable the request button when the Flash transport is
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//initialized.
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YAHOO.util.Connect.xdrReadyEvent.subscribe(function() {
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document.getElementById('fetch').disabled = false;
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});
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</textarea>
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<h3>Configure the Callback Handlers and Make a Cross-Domain Request.</h3>
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<p>
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Cross-domain transactions are determined by setting the <code>xdr</code> property on the callback object to <code>true</code>. This instructs Connection Manager to use the alternate transport, initialized earlier, instead of XMLHttpRequest.
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</p>
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<p>
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In this example, we will create functions to handle success and failure outcomes, and use a global listener to Connection Manager's <code>startEvent</code> to listen for the start of each transaction. Since the response data are JSON, we use the JSON utility to parse it, and use <code>substitute</code> to filter the results.
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</p>
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<textarea name="code" class="JScript" cols="60" rows="1">
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<script language="javascript">
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//Response data will be displayed as an unordered list.
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var output = document.getElementById('list'),
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//Shortcut for YAHOO.util.Connect.
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YCM = YAHOO.util.Connect;
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//Event handler called when the transaction begins:
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var handleStart = function(e, a) {
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YAHOO.log("Transaction " + a[0].tId + " is starting.", "info", "example");
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output.innerHTML = "<li>Loading news stories via Yahoo! Pipes feed...</li>";
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}
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//Event handler for the success outcome -- use this handler to write the fetched
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//RSS items to the page.
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var handleSuccess = function(o) {
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//We use JSON.parse to sanitize the JSON (as opposed to simply eval'ing
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//it into the page):
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var oRSS = YAHOO.lang.JSON.parse(o.responseText);
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//From here, we simply access the JSON data from where it's provided
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//in the Yahoo! Pipes output:
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if (oRSS && oRSS.count) {
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var s = "<!--begin news stories fetched via Yahoo! Pipes-->",
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//t in this case is our simple template; this is fed to
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//YAHOO.Lang.substitute as we loop through RSS items:
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t = "<li><a href='{link}'>{title}</a>, {pubDate}</li>";
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for (var i=0; i<oRSS.count; i++) {
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s += YAHOO.lang.substitute(t, oRSS.value.items[i]);
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}
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//Output the string to the page:
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output.innerHTML = s;
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} else {
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//No news stories were found in the feed.
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output.innerHTML = "<li>The RSS feed did not return any items.</li>";
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}
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}
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//HTTP status evaluates to failure and this function is called:
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var handleFailure = function(o) {
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YAHOO.log("ERROR " + o.id + " " + o.argument, "info", "example");
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}
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//Set up the callback object used for the transaction.
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var callback = {
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success: handleSuccess,
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failure: handleFailure,
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xdr: true
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};
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//Listen for Connection Manager's start event.
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YCM.startEvent.subscribe(handleStart);
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//Wire the button to a click handler to fire a request each
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//time the button is clicked:
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var send = function(o) {
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YAHOO.log("Click detected; beginning io request to Yahoo! Pipes.", "info", "example");
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var obj = YCM.asyncRequest('GET',
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//this is a specific Pipes feed, populated with cycling news:
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"http://pipes.yahooapis.com/pipes/pipe.run?_id=giWz8Vc33BG6rQEQo_NLYQ&_render=json",
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callback
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);
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}
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</textarea>
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<h2>Configuration for This Example</h2>
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<p>You can load the necessary JavaScript and CSS for this example from Yahoo's servers. <a href="http://developer.yahoo.com/yui/articles/hosting/?event&connection&json&MIN#configure">Click here to load the YUI Dependency Configurator with all of this example's dependencies preconfigured</a>.</p>
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</div>
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<div class="yui-u">
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<div id="examples">
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<h3 class='firstContent'>Connection Manager Examples:</h3>
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<div id="exampleToc">
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<ul>
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<li><a href='../connection/get.html'>Connection Manager GET Transaction</a></li><li><a href='../connection/post.html'>Connection Manager POST Transaction</a></li><li><a href='../connection/abort.html'>Connection Manager Transaction Timeout</a></li><li><a href='../connection/weather.html'>Retrieving a Yahoo! Weather RSS Feed</a></li><li class='selected'><a href='../connection/xdr.html'>Cross-Domain Transactions with Connection Manager</a></li><li><a href='../connection/global_customevents.html'>Subscribing to Connection Manager Global Events</a></li><li><a href='../connection/callback_customevents.html'>Subscribing to Connection Manager's Custom Events via the Callback Object</a></li><li><a href='../imagecropper/conn_crop.html'>Connection Manager assisted image crop (included with examples for ImageCropper Control (beta))</a></li><li><a href='../treeview/dynamic_tree.html'>Dynamically Loading Node Data (included with examples for TreeView Control)</a></li><li><a href='../editor/post_editor.html'>Editor Data Post with Connection Manager (included with examples for Rich Text Editor)</a></li><li><a href='../layout/calrte_layout.html'>Simple Application (included with examples for Layout Manager)</a></li> </ul>
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</div>
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</div>
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<div id="module">
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<h3>More Connection Manager Resources:</h3>
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<ul>
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<li><a href="http://developer.yahoo.com/yui/connection/">User's Guide</a> (external)</li>
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<li><a href="../../docs/module_connection.html">API Documentation</a></li>
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<li><a href="http://yuiblog.com/assets/pdf/cheatsheets/connection.pdf">Cheat Sheet PDF</a> (external)</li></ul>
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</div>
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</div>
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</div>
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</div>
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</div>
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<div class="yui-b" id="tocWrapper">
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<!-- TABLE OF CONTENTS -->
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<div id="toc">
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<ul>
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<li class="sect first">Yahoo! UI Library</li><li class="item"><a title="The Yahoo! User Interface Library (YUI)" href="http://developer.yahoo.com/yui/">Home (external)</a></li><li class="item"><a title="The Yahoo! User Interface Blog" href="http://yuiblog.com">YUIBlog (external)</a></li><li class="item"><a title="YUILibrary.com hosts the YUI community forums" href="http://yuilibrary.com/forum/">YUI Discussion Forum (external)</a></li><li class="item"><a title="The YUI Library source can be checked out from GitHub" href="http://github.com/yui/">YUI on GitHub</a></li><li class="item"><a title="Instantly searchable API documentation for the entire YUI library." href="../../docs/index.html">API Documentation</a></li><li class="item"><a title="Examples of every YUI utility and control in action" href="../../examples/">Functional Examples</a></li><li class="item"><a title="Videos and podcasts from the YUI Team and from the Yahoo! frontend engineering community." href="http://developer.yahoo.com/yui/theater/">YUI Theater (external)</a></li><li class="item"><a title="YUI is free and open, offered under a BSD license." href="http://developer.yahoo.com/yui/license.html">YUI License (external)</a></li><li class="sect">YUI Functional Examples</li><li class="item"><a title="The YUI Animation Utility - Functional Examples" href="../../examples/animation/index.html">Animation</a></li><li class="item"><a title="The YUI AutoComplete Control - Functional Examples" href="../../examples/autocomplete/index.html">AutoComplete</a></li><li class="item"><a title="The YUI Browser History Manager - Functional Examples" href="../../examples/history/index.html">Browser History Manager</a></li><li class="item"><a title="The YUI Button Control - Functional Examples" href="../../examples/button/index.html">Button</a></li><li class="item"><a title="The YUI Calendar Control - Functional Examples" href="../../examples/calendar/index.html">Calendar</a></li><li class="item"><a title="The YUI Carousel Control - Functional Examples" href="../../examples/carousel/index.html">Carousel</a></li><li class="item"><a title="The YUI Charts Control - Functional Examples" href="../../examples/charts/index.html">Charts</a></li><li class="item"><a title="The YUI Color Picker Control - Functional Examples" href="../../examples/colorpicker/index.html">Color Picker</a></li><li class="item"><a title="The YUI Cookie Utility - Functional Examples" href="../../examples/cookie/index.html">Cookie</a></li><li class="selected "><a title="The YUI Connection Manager (AJAX) - Functional Examples" href="../../examples/connection/index.html">Connection Manager</a></li><li class="item"><a title="The YUI Container Family (Module, Overlay, Tooltip, Panel, Dialog, SimpleDialog) - Functional Examples" href="../../examples/container/index.html">Container</a></li><li class="item"><a title="The YUI DataTable Control - Functional Examples" href="../../examples/datatable/index.html">DataTable</a></li><li class="item"><a title="The YUI Dom Collection - Functional Examples" href="../../examples/dom/index.html">Dom</a></li><li class="item"><a title="The YUI Drag & Drop Utility - Functional Examples" href="../../examples/dragdrop/index.html">Drag & Drop</a></li><li class="item"><a title="The YUI Event Utility - Functional Examples" href="../../examples/event/index.html">Event</a></li><li class="item"><a title="The YUI Get Utility - Functional Examples" href="../../examples/get/index.html">Get</a></li><li class="item"><a title="The YUI ImageCropper Control - Functional Examples" href="../../examples/imagecropper/index.html">ImageCropper</a></li><li class="item"><a title="The YUI ImageLoader Utility - Functional Examples" href="../../examples/imageloader/index.html">ImageLoader</a></li><li class="item"><a title="The YUI JSON Utility - Functional Examples" href="../../examples/json/index.html">JSON</a></li><li class="item"><a title="The YUI Layout Manager - Functional Examples" href="../../examples/layout/index.html">Layout Manager</a></li><li class="item"><a title="The YUI Logger Control - Functional Examples" href="../../examples/logger/index.html">Logger</a></li><li class="item"><a title="The YUI Menu Control - Functional Examples" href="../../examples/menu/index.html">Menu</a></li><li class="item"><a title="The YUI Paginator - Functional Examples" href="../../examples/paginator/index.html">Paginator</a></li><li class="item"><a title="The YUI Profiler Utility - Functional Examples" href="../../examples/profiler/index.html">Profiler</a></li><li class="item"><a title="The YUI ProfileViewer Control - Functional Examples" href="../../examples/profilerviewer/index.html">ProfilerViewer</a></li><li class="item"><a title="The YUI ProgressBar Control - Functional Examples" href="../../examples/progressbar/index.html">ProgressBar</a></li><li class="item"><a title="The YUI Resize Utility - Functional Examples" href="../../examples/resize/index.html">Resize</a></li><li class="item"><a title="The YUI Rich Text Editor - Functional Examples" href="../../examples/editor/index.html">Rich Text Editor</a></li><li class="item"><a title="The YUI Selector Utility - Functional Examples" href="../../examples/selector/index.html">Selector</a></li><li class="item"><a title="The YUI Slider Control - Functional Examples" href="../../examples/slider/index.html">Slider</a></li><li class="item"><a title="The YUI Storage Utility - Functional Examples" href="../../examples/storage/index.html">Storage</a></li><li class="item"><a title="The YUI SWF Utility - Functional Examples" href="../../examples/swf/index.html">SWF</a></li><li class="item"><a title="The YUI SWFStore Utility - Functional Examples" href="../../examples/swfstore/index.html">SWFStore</a></li><li class="item"><a title="The YUI Stylesheet Utility - Functional Examples" href="../../examples/stylesheet/index.html">Stylesheet</a></li><li class="item"><a title="The YUI TabView Control - Functional Examples" href="../../examples/tabview/index.html">TabView</a></li><li class="item"><a title="The YUI TreeView Control - Functional Examples" href="../../examples/treeview/index.html">TreeView</a></li><li class="item"><a title="The YUI Uploader Utility - Functional Examples" href="../../examples/uploader/index.html">Uploader (experimental)</a></li><li class="item"><a title="The YUI YAHOO Global Object - Functional Examples" href="../../examples/yahoo/index.html">YAHOO Global Object</a></li><li class="item"><a title="The YUI Loader Utility - Functional Examples" href="../../examples/yuiloader/index.html">YUI Loader</a></li><li class="item"><a title="The YUI Test Utility - Functional Examples" href="../../examples/yuitest/index.html">YUI Test</a></li><li class="item"><a title="YUI Reset CSS - Functional Examples" href="../../examples/reset/index.html">Reset CSS</a></li><li class="item"><a title="YUI Base CSS - Functional Examples" href="../../examples/base/index.html">Base CSS</a></li><li class="item"><a title="YUI Fonts CSS - Functional Examples" href="../../examples/fonts/index.html">Fonts CSS</a></li><li class="item"><a title="YUI Grids CSS - Functional Examples" href="../../examples/grids/index.html">Grids CSS</a></li><li class="sect">YUI Articles on the YUI Website</li><li class="item"><a title="Answers to Frequently Asked Questions about the YUI Library" href="http://developer.yahoo.com/yui/articles/faq/">YUI FAQ (external)</a></li><li class="item"><a title="Yahoo!'s philosophy of Graded Browser Support" href="http://developer.yahoo.com/yui/articles/gbs/">Graded Browser Support (external)</a></li><li class="item"><a title="Reporting Bugs and Making Feature Requests for YUI Components" href="http://developer.yahoo.com/yui/articles/reportingbugs/">Bug Reports/Feature Requests (external)</a></li><li class="item"><a title="Serve YUI source files from Yahoo! -- free, fast, and simple" href="http://developer.yahoo.com/yui/articles/hosting/">Serving YUI Files from Yahoo! (external)</a></li><li class="item"><a title="Best practices for working with web services while protecting user privacy" href="http://developer.yahoo.com/security/">Security Best Practices (external)</a></li></ul>
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</div>
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</div><!--closes bd-->
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<div id="ft">
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<p class="first">Copyright © 2010 Yahoo! Inc. All rights reserved.</p>
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<p><a href="http://privacy.yahoo.com/privacy/us/devel/index.html">Privacy Policy</a> -
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<a href="http://docs.yahoo.com/info/copyright/copyright.html">Copyright Policy</a> -
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<a href="http://careers.yahoo.com/">Job Openings</a></p>
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