Disable button on form submission

Question

I have a button that I would like to disable when the form submits to prevent the user submitting multiple times.

I have tried naively disabling the button with java

Answer 1

The following function is useful without needing the disabling part which tends to be unreliable. Just use "return check_submit();" as part of the onclick handler of the submit buttons.

There should also be a hidden field to hold the form_submitted initial value of 0;

function check_submit (){
            if (document.Form1.form_submitted.value == 1){
                alert("Don't submit twice. Please wait.");
                return false;
            }
            else{
                document.Form1.form_submitted.value = 1;
                return true;
            }
            return false;
    }