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# YUI Library Examples: DataSource Utility: DataSource with Polling

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## DataSource Utility: DataSource with Polling

DataSource's Pollable extension enables polling functionality on all your DataSource instances.

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###### Poll every second for current time:

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

YUI().use("datasource-function", "datasource-polling", function(Y) { var myFunction = function() { return new Date(); }, myDataSource = new Y.DataSource.Function({source:myFunction}), callback = { success: function(e){ alert("At the tone the time will be: " + e.response.results[0]); }, failure: function(e){ alert("Could not retrieve data: " + e.error.message); } }, id = myDataSource.setInterval(1000, null,callback); // Starts polling myDataSource.clearInterval(id); // Ends polling });

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