Question

I want a button to be disabled when it is clicked. Here is my code:

var disable = function(form_name,btn_name) {
    document.form_name.btn_name.disabled = true;
}

This is how disable() is called:

<form name = 'form1'>
     <input name = 'btn1' type = 'button' disabled = false onclick = 'disable("form1","btn1")' />
</form>

This code does not work. Does anyone know why?

Answer 1

Because

document.form_name.btn_name.disabled = true;

is the same as doing

document['form_name']['btn_name'].disabled = true;

You need to do

document[form_name][btn_name].disabled = true;