Duplicate ID issue

[himat]

Hi,

I'm trying to call morphdom with fromElem:

 <div id="thing">
     <div id="thing">
         <div class="TableObject border-bottom border-gray-light py-3">
         </div>
     </div>
 </div>

toElem:

<div id="thing"></div

But this doesn't change fromElem at all! It looks the exact same as it was. This is mainly due to there being duplicated ID fields. If I rename either of the thing IDs to say something else, then morphdom correctly works and fromElem is turned into toElem.

Is there a way around this limitation? I understand ID fields should be unique, but a user is passing this HTML to me, and I don't have control over them incorrectly using duplicated IDs.

I saw that I can provide my own unique ID function for morphdom, but I'm not sure how I would generate a unique key in this case?

[himat]

If there's no way around the limitation, then an alternative would be if morphdom can give me back an error saying that it couldn't morph the fromElem or a notice saying that the fromElem was not changed would be good as well. That way, I could handle this special case of two duplicated IDs myself.

[Prinzhorn]

I just ran into a similar situation where morphdom would just keep adding the same element with every morph because of duplicate Ids. I would really appreciate if there could be a warning or exception when duplicate getNodeKey are detected. That would have saved me some time finding and disabling getNodeKey.