getElementsByClassName().classList.remove() returning undefined Code Answer

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I have a Marketo form which I want upon form submission to hide all form elements and show a div (class of “thank-you”), and I keep getting the error Uncaught TypeError: Cannot read property 'remove' of undefined. Any ideas what I may be doing wrong?



<div class="thank-you hide">




The getElementsByClassName method returns a collection of all elements in the document with the specified class name, as a NodeList object, so you need access it by passing index

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