How to multiply a value and use it dynamically in text

Hey there!

I have made a form which has some text boxes in it. In one of the boxes, a user can fill in a number of persons [VALUE] attending a summit. What I want to do next is have a checkbox underneath it saying "By pressing the submit button, I agree upon paying the fee of € [VALUE * 45,00] to bank account 123456789."

I know how to make such a checkbox, no problems so far. What I do need to figure out is how the [VALUE] is being multiplied by "45" and how I manage to dynamically post it in the text/label of the checkbox.

Can anyone help me out with this please?

Regards,
Frank

Hi Frank,

In the checkbox label - or in a Custom Element element if the checkbox label doesn't work add

By pressing the submit button, I agree upon paying the fee of €<span id='amount'></span> to bank account 123456789.

Then add this into a Load JS action in the ON Load event:

window.addEvent('domready', function() {
  $('VALUE').addEvent('keyup', function(){
    if ( $('VALUE').value > 0 ) {
      $('amount').set('text', $('VALUE').value * 45 );
    }
  });
});

You need to make sure that the VALUE element has it's ID set to VALUE for this to work.

Bob