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<title>Example: Loading Tab Content</title>
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<h1>Example: Loading Tab Content</h1>
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<div class="content"><div class="intro">
<p>This example shows how to create a plugin to load YQL data into a TabView for dynamic content.</p>
</div>
<div class="example yui3-skin-sam">
<style>
.example h3 {
color: #666;
margin: 0.5em 0;
}
</style>
<h3>Today's Browser News</h3>
<div id="demo"></div>
<script type="text/javascript">
YUI().use('tabview', 'yql', function(Y) {
// YQL plugin for Y.Tab instances
var TabYQL = function(config) {
this.init(config);
};
TabYQL.NS = 'yql'; // plugin namespace (e.g. "tab.yql.load(myQuery)");
TabYQL.prototype = {
init: function(config) {
if (config) {
this.tab = config.host;
this.query = config.query || this.query;
this.errorMsg = config.errorMsg || this.errorMsg;
}
if (this.tab) {
this.tab.after('selectedChange', Y.bind(this.afterSelectedChange, this));
}
},
loaded: false,
query: '',
errorMsg: 'There was a problem loading the content',
tab: null,
afterLoad: function(response) {
var results = (response.query) ? response.query.results.item : null,
content = '';
if (results) {
Y.each(results, function(fields) {
content += '<li><a href="' + fields.link + '">' +
fields.title + '</a></li>';
});
this.loaded = true;
content = '<ul>' + content + '</ul>'
} else {
content = this.errorMsg;
}
this.tab.set('content', content);
},
afterSelectedChange: function(e) {
// only load if not already loaded
if (!this.loaded) {
this.load(this.query, this.afterLoad);
}
},
load: function(query, afterLoad) {
Y.YQL(query, Y.bind(afterLoad, this));
}
};
var tabview = new Y.TabView(),
feeds = {
Chrome: 'chrome+browser',
Firefox: 'firefox+browser',
Safari: 'safari+browser',
Explorer: 'explorer+browser',
Opera: 'opera+browser'
};
Y.each(feeds, function(feed, label) {
var tab = new Y.Tab({
label: label,
content: 'loading...'
});
tab.plug(TabYQL, {
query: 'select title, link from rss where ' +
'url="http://search.news.yahoo.com/rss?p=' +
feed + '"'
});
tabview.add(tab);
});
tabview.render('#demo');
});
</script>
</div>
<p>
<strong>Note:</strong> be sure to add the <code>yui3-skin-sam</code> classname to the
page's <code><body></code> element or to a parent element of the widget in order to apply
the default CSS skin. See <a href="http://yuilibrary.com/yui/docs/tutorials/skins/">Understanding Skinning</a>.
</p>
<pre class="code prettyprint"><body class="yui3-skin-sam"> <!-- You need this skin class --></pre>
<h2>Creating the YQL Plugin</h2>
<h3>Plugin Constructor</h3>
<p>To create a plugin, we need to create a constructor with a static
<code>NS</code> property. This is the namespace used by the plugin on each
instance.</p>
<pre class="code prettyprint">// YQL plugin for Y.Tab instances
var TabYQL = function(config) {
this.init(config);
};
TabYQL.NS = 'yql'; // plugin namespace (e.g. "tab.yql.load(myQuery)");</pre>
</h3>Plugin Prototype</h3>
<p>Next we will add the YQL functionality to the prototype. The init method
wires the YQL functionality up using the load method.</p>
<pre class="code prettyprint">TabYQL.prototype = {
init: function(config) {
if (this.tab) {
this.tab.after('selectedChange', Y.bind(this.afterSelectedChange, this));
}
},
afterSelectedChange: function(e) {
// only load if not already loaded
if (!this.loaded) {
this.load(this.query, this.afterLoad);
}
},
load: function(query, afterLoad) {
Y.YQL(query, Y.bind(afterLoad, this));
}</pre>
<h2>Creating the TabView</h2>
<p>Next we will create a new instance of a TabView:</p>
<pre class="code prettyprint">/* Create a new TabView instance, with content generated from script */
var tabview = new Y.TabView();</pre>
<p>And then use the <code>add</code> method to add the <code>Tab</code> instances,
to add a tab for each of the feeds, then render the tabview into the placeholder
element.</p>
<pre class="code prettyprint">var feeds = {
Chrome: 'chrome+browser',
Firefox: 'firefox+browser',
Safari: 'safari+browser',
Explorer: 'explorer+browser',
Opera: 'opera+browser'
};
Y.each(feeds, function(feed, label) {
var tab = new Y.Tab({
label: label,
content: 'loading...',
});
tab.plug(TabYQL, {
query: 'select title, link from rss where ' +
'url="http://search.news.yahoo.com/rss?p=' +
feed + '"'
});
tabview.add(tab);
});
tabview.render('#demo');</pre>
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<div class="sidebar">
<div class="sidebox">
<div class="hd">
<h2 class="no-toc">Examples</h2>
</div>
<div class="bd">
<ul class="examples">
<li data-description="This example shows how to create a TabView wigdet from existing HTML.">
<a href="tabview-basic.html">TabView from Existing Markup</a>
</li>
<li data-description="This example shows how to create a TabView wigdet from JavaScript.">
<a href="tabview-fromjs.html">Dynamic TabView from JavaScript</a>
</li>
<li data-description="This example shows how to add and remove Tabs.">
<a href="tabview-add-remove.html">Adding and Removing Tabs</a>
</li>
<li data-description="This example shows how to load tab content remotely using a YQL plugin.">
<a href="tabview-yql.html">Loading Tab Content</a>
</li>
</ul>
</div>
</div>
<div class="sidebox">
<div class="hd">
<h2 class="no-toc">Examples That Use This Component</h2>
</div>
<div class="bd">
<ul class="examples">
<li data-description="Demonstrates how to add browser history support to a TabView widget using the History Utility.">
<a href="../history/history-tabview.html">History + TabView</a>
</li>
</ul>
</div>
</div>
</div>
</div>
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<script src="../assets/vendor/prettify/prettify-min.js"></script>
<script>prettyPrint();</script>
<script>
YUI.Env.Tests = {
examples: [],
project: '../assets',
assets: '../assets/tabview',
name: 'tabview-yql',
title: 'Loading Tab Content',
newWindow: '',
auto: false
};
YUI.Env.Tests.examples.push('tabview-basic');
YUI.Env.Tests.examples.push('tabview-fromjs');
YUI.Env.Tests.examples.push('tabview-add-remove');
YUI.Env.Tests.examples.push('tabview-yql');
YUI.Env.Tests.examples.push('history-tabview');
</script>
<script src="../assets/yui/test-runner.js"></script>
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