<style>
/* 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")
                     .setHTML("At the tone the time will be: " +
                                Y.dump(e.response.results[0].toString()));
                },
                failure: function(e){
                    Y.one("#demo_output_polling")
                     .setHTML("Could not retrieve data: " + e.error.message);
                }
            }
        },
        id = myDataSource.setInterval(1000, request); // Starts polling

        myDataSource.clearInterval(id); // Ends polling
});
```
