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How to run custom code on form submit error

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I'm looking to be able to run custom code when a form submission fails.

Specifically, I have an iframe of a form that when the user enters an invalid email address the error message that appears causes the contents of the iframe grow larger than the iframe itself and the form becomes truncated. I have a javascript function that resizes it that can be called, but I haven't been able to figure out how to know when the form submission has failed to be able to call it.

The best solution I've found is to just run some code every second that resizes the iframe in case it has changed, but looking for something event based that I can avoid having to do this.



Screenshot 2022-11-30 203904.png

Screenshot 2022-11-30 203812.png

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  • Solution

For anyone else reading this, I figured out a way to make this work by continuously looking for the form's error field inside the iframe then calling my function to resize if it's present:

var foundFormError = false;
    function() {
        if (!foundFormError) {
            var ctas = document.querySelectorAll(`iframe[id^="cta-iframe"]`);
            ctas.forEach(cta => {
                var iframeContent = document.getElementById(cta.id).contentWindow.document;
                if (iframeContent.getElementsByClassName('field-error').length > 0) {
                    foundFormError = true;
                    // resize here!


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