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.
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…';"