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I had a question yesterday which was answered by Chriistian, pasted below. I have added that code into html on line 2048 with comments of how i believe it should work. However not sure if this was the right place to put it or even if it was the right document, should it of gone into the main.js file somewhere?
ThankyouAnswered by Chriistian
I checked the form on your webpage and it appears that you were able to successfully display the generated serial number into the text area of the form. However, upon checking the code, it appears that the text-area was not created from jotform, which is why it is not being displayed in the email response.
var serialCode = document.getElementById("code").value;
document.getElementById("mytextarea").value = serialCode";
If you need further assistance, please let us know.
In your script, you can actually set the textarea from your JotForm as the direct output field so you don't need to pass them from textarea to another textarea.
Or, simply rename the textarea field ID from JotForm to "code" and delete your custom textarea field. So values from old textarea field will be automatically passed on the textarea field from JotForm.
If you need further help, let us know.