Question

I have a submit button at the end of the form.

I have added the following condition to the submit button:

onClick="this.disabled=true;
this.value='Sending…';
this.form.submit();"

But when it moves to the next page, the parameters did not pass and null values are passed.

Answer 1

Probably you’re submitting the form twice.
Remove the this.form.submit() or add return false at the end.

you should end up with onClick="this.disabled=true; this.value='Sending…';"