How to disable submit button once it has been clicked?

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=\'         


        

Answer 1

I did the trick. When set timeout, it works perfectly and sending all values.

    $(document).ready(function () {
        document.getElementById('btnSendMail').onclick = function () {
            setTimeout(function () {
                document.getElementById('btnSendMail').value = 'Sending…';
                document.getElementById('btnSendMail').disabled = true;
            }, 850);
        }
    });