<style scoped>

/* custom styles for this example */

#demo .output {margin-bottom:1em; padding:10px; border:1px solid #D9D9D9;}

</style>

<div class="intro">

<p>DataSource's Pollable extension enables polling functionality on all your DataSource instances.</p>

</div>

<div class="example yui3-skin-sam">

{{>datasource-polling-source}}

</div>

<p>Include the `datasource-pollable` extension in your `Y.use()` statement to add the `setInterval()`, `clearInterval()`, and `clearAllInterval()` methods to all your DataSource instances.</p>

```

YUI().use("datasource-function", "datasource-polling", function(Y) {

var myFunction = function() {

return new Date();

},

myDataSource = new Y.DataSource.Function({source:myFunction}),

request = {

callback: {

success: function(e){

Y.one("#demo_output_polling")

.setContent("At the tone the time will be: " +

Y.dump(e.response.results[0].toString()));

},

failure: function(e){

Y.one("#demo_output_polling")

.setContent("Could not retrieve data: " + e.error.message);

}

}

},

id = myDataSource.setInterval(1000, request); // Starts polling

myDataSource.clearInterval(id); // Ends polling

});

```