Question

I have the following:

var viewID = $(link).data('dialog-id')

This works when there is a dialog-id value. But when there is no value then viewID gets the value of “undefined”.

Is there a way that I can make the value of viewID be equal to an empty string if dialog-id is not available or be equal to dialog-id if it is available?

Answer 1

You can do:

var viewID = $(link).data('dialog-id') || '';

Which works thanks to the way Javascript handles short-circuit evaluation.