Example #9 — generating password with fake progress

Example #9: generating password with fake progress

Of course generating a random password is done in less than a millisecond. But you want to simulate heavy computational things going on – just for a nice user experience.

Given that you have a method which adds one random character at a time to an input value,
e.g.

var alphabet = '012345689abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
function addRandomChar() {
  return $(this).val() + alphabet[Math.floor(Math.random() * alphabet.length)];
}

,
then you can use that to build our password generator.

$('button').click($).prev('input').unrepeat()
  .val('').addClass('load').repeat(200)
  .val(addRandomChar).until(10)
  .removeClass('load');

⇒

Enter your new password, please:
-

So what happens here?

First we interrupt any possibly ongoing password generation by using .unrepeat().
We clear the current password value and add a nice animated gif in the background with .val('').addClass('load').
Now we repeatedly add a new random character with .repeat(200).val(addRandomChar).
After doing so for 10 times we stop and then remove our CSS class with .until(10).removeClass('load').

Try out clicking multiple times on that button. You will see, that the ongoing animation is always stopped before starting over.

Other examples with callbacks

Example #5: create dynamic tables with instant loops

Example #9
with jquery-timing methods

timing methods used in example #9