Usage of data attribute VS custom element attribute

Question

I understand that create a custom attribute on a custom element in Polymer allows us to watch for changes to that attribute by specifying a listener. But if I just need to expose a data from my custom element when do I use data attribute and when to use a Polymer's custom attribute?

I also understand that data- takes only strings

One thing I noticed is when I use data- attribute to bind data the changes are not getting triggered to the bounded attribute — mohanaravind
– mohanaravind, Commented Feb 27, 2014 at 18:16

robdodson · Accepted Answer · 2014-02-27 21:03:26Z

1

I think you'll pretty much always want to use Polymer's custom attributes unless your attribute has the same name as a built-in attribute (like title). As you noticed, the change handlers will not work with data- attributes.

answered Feb 27, 2014 at 21:03

robdodson

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ebidel Over a year ago

Just to add... we recommend custom attributes because you can publish properties in Polymer as attributes. This allows you to take advantage of Polymer's data-binding features and <prop>Changed() handlers. data-* attrs aren't observable in the same way to Polymer's internals.

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