Expected behavior

Let us suppose to have a button with the attribute data-myvalue="23456" and a select which contains an option with that value.

If we use jquery to get the data value, this should work:

mySelect.setValue($('#mybutton').data('myvalue'))

Actual behavior

Actually, the value is not set properly because it is not a string. The select resets to the first value.

Workaround:

mySelect.setValue(String($('#mybutton').data('myvalue')))

In my opinion, this additional check should be done directly by the funcion setValue, not by the user. Sometimes we do not know if the value is a string or a number a priori.

You just need to add String() in the setValue function

If we use vanilla js the getAttribute('data-myvalue') function gives always a string and there seems to be no issue

I prepared a snippet:

https://mdbootstrap.com/snippets/standard/gianlucagiacometti/4458108