Jquery select all elements that have $jquery.data()

by

You could do

$('[data-myAttr!=""]');

this selects all elements which have an attribute data-myAttr which is not equal to ” (so it must have been set); (only for elements that have their data attribute set in HTML not via jQuery)

you could also use filter() (which works for data attributes set from jQuery)

$('*').filter(function() {
    return $(this).data('myAttr') !== undefined;
});

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