Display a Custom Alert Message on Google Forms

[John Tan]

Hi, how do I display a custom alert message on Google Forms either when an incorrect value for a field (the default data validation is not adequate) is entered or upon clicking the submit button. Thank you for your advice! 

[Alan Wells]

A Google Form doesn't have the capability to display a custom message to the user, except for the message that gets displayed after the Form is submitted.  If you absolutely need that capability, then you'd need to use something other than a Google Form.

[John Tan]

That's what I'm afraid to hear. I have been searching for a solution to this problem without success. Thank you for your prompt response!

[Alan Wells]

If you want to stay with Google products, then you could use an Apps Script Web App, and create an input form from HTML, CSS and JavaScript.  There's also the possibility of imbedding the Apps Script Web App into a Google Site.

[CBMServices Web]

Google forms does have rudimentary validation of input and you can put a custom message that is shown when validation fails. But no pop ups or complex validation of input is possible. If you need to do that, you should go with Alan's suggestion and create your own html form and can use a web app to receive the input from the form.

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[John Tan]

Thanks for your suggestions, Alan & George! Hopefully, Google Forms could incorporate a feature to display custom alert pop-up message in future.