[Solved] HTML 5 dataset issue

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As mentioned in the comments by adeneo and Banana, the first and the last should not work. Attempted both in a jsFiddle and both threw errors. This is because .dataset is not within jQuery. You must have code internally or externally adding dataset to that jQuery object.

the following are similar syntax but should work (where with only the details you gave, your code shouldn’t work):

document.getElementById("id").dataset.assoc
$("#id")[0].dataset.assoc

This is due to data-* attributes in HTML5.

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solved HTML 5 dataset issue