jQuery .data method should return always fresh values

[marco@…]

Hi!

As stated in the manual, the .data() method pulls in the HTML5 data- attributes only once per element.

However, this is bad from a debugging perspective - I would like to be able to do a $(el).attr("data-foo","bar") followed by either .data() or further .attr("data-foo","...") calls so that the current value of the data attribute is visible in the DOM inspector.

A quick testcase is at ​http://jsfiddle.net/ZYz4A/. Alternatively, I'd suggest placing something in the manual at ​http://api.jquery.com/data/ which says how one can quickly see the data attribute values in the Inspectors of Chrome, IE and Firefox.

[marco@…]

Furthermore, data() and the data selector are not compatible with each other.

The behaviour described in ​http://visualstudiomagazine.com/articles/2013/02/01/working-with-html5.aspx does not work when mixing .attr() and .data() writes to the data storage; I updated the fiddle to ​http://jsfiddle.net/ZYz4A/1/.

[dmethvin]

#14443 is a duplicate of this ticket.

[dmethvin]

#14442 is a duplicate of this ticket.

[dmethvin]

The properties of .data() are intentionally not serialized to the element on its dataSet, for example they could be a function or complex constructed objects. We are not going to change the documented semantics of .data().

[marco@…]

Hi!

Thanks for the answer (and I'm fine with not changing the semantics due to BC)... but how is one then supposed to filter by the data attribute? Not serializing it back definitely breaks the [data-key=value] selector, so I'm re-opening the issue if you don't mind.

[dmethvin]

Use .attr("data-xxxx") to set the data attribute, as described in the docs. There is no performant way to search the entire DOM for values set by .data() because it's not intended for those uses; use a class instead.