Wix Forms: OnWixFormSubmitHookError => changes to fields are not valid

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HI JD!
Thanks for the reply.

  1. Initially I had tried only one field, the dropdown fieldValue change. The value changed. But the error is thrown while returning or outside the event handler, I suppose.
    (I have added a lot of console log stmts which I removed in the post to the make the code small :grinning:)
  let coursename = dropdownoptions[index].label ; // set value to readable Name

  event.fields[i].fieldValue = coursename;   // Error
  //Wix Forms: OnWixFormSubmitHookError => changes to fields are not valid
  1. So I tried a field value change for another basic type which is a text field, and it worked.
let coursename = "FIRST NAME";    // Another field (input25) type Text
if (event.fields[i].id === "input25"){
             event.fields[i].fieldValue = coursename;   // FieldValue Changes - Works
         }

3)I set the dropdown fieldValue to “”. It works. No error, the form submission mail shows Cours Name: -


  event.fields[i].fieldValue = "";  // FieldValue Changes - Works
  1. I set it the original value again. It works. No error.
let coursename = dropdownoptions[index].value ; // set coursename to option's value

  event.fields[i].fieldValue = coursename;    // FieldValue Changes - Works
    1. I set it another option’s value. It works. No error.
let coursename = dropdownoptions[index+1].value ; // set coursename to next option's value in the dropdown

  event.fields[i].fieldValue = coursename;    // FieldValue Changes - Works
  1. When I set it to just " ", (a space), error is thrown.

  event.fields[i].fieldValue = " "; // Error
//Wix Forms: OnWixFormSubmitHookError => changes to fields are not valid

Looks like, though the dropdown value is a string, it does not accept any value other than one of the values of its options or undefined “”.

Pls throw some light and suggest a work around.

Thanks
Gita