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JavaScript jQuery Basics (2014) Creating a Password Confirmation Form Perfect

Posted by Peter Vann
Peter Vann
36,425 Points

JQuery Basics: Extending 'Perfect'

In an effort to experiment and improve the validation a little more (and for some fun), I added three new behaviors to the code:

1) Prevent the cursor from becoming a 'hand' whenever canSubmit() is false

2) Use regular expressions to prevent users from entering disallowed characters

3) Cause a an error 'beep' if the user types an invalid character

(Step 3 required uploading the default Windows Ding .wav file.)

Here's my code: (only included the modified part of the code)

function error_beep() {
  var snd = new Audio("../sound/windows-ding.wav");
  snd.play();
  return false;
}

function swapCursor(){
  // Enable/Disable 'Hand' Cursor
  return canSubmit() ? 'hand' : 'default';
}

function restrictUserInput(key) {
  // Restrict input with RegEx
  const char = String.fromCharCode(key.charCode);
  var regEx = new RegExp(/^[a-zA-Z0-9!@#$%^&*]/);
  if (!regEx.test(char)) {
    error_beep();
    return false;
  }
};

function enableSubmitEvent() {                
  $("#submit").prop("disabled", !canSubmit()).css('cursor', swapCursor());
}

//When event happens on password input
$password.focus(passwordEvent).keyup(passwordEvent).keyup(confirmPasswordEvent)
.keyup(enableSubmitEvent).keypress(restrictUserInput);

//When event happens on confirmation input
$confirmPassword.focus(confirmPasswordEvent).keyup(confirmPasswordEvent)
.keyup(enableSubmitEvent).keypress(restrictUserInput);

enableSubmitEvent();

One thing I found curious is that the 'key' parameter gets passed to the retrictUserInput function seeming automatically.

Try it.

Enjoy.

-Pete

2 Answers

Steven Parker
Steven Parker
229,732 Points
Steven Parker
Steven Parker
229,732 Points

There's nothing surprising about the argument. According to the documentation for .keypress it takes a handler as an argument. And the handler is defined as a function which takes an event object as a parameter. And of course, that object has a charCode property.

Good job on your enhancements. :+1: And since you used it consistently, the code works as-is; but I couldn't help but think that "retrictUserInput" might be missing a letter "s" in the name (to make it "restrictUserInput").

Peter Vann
Peter Vann
36,425 Points
Peter Vann
Peter Vann
36,425 Points

Thanks for the clarification about handlers - very helpful! Something tells me I could use to spend more time perusing the documentation. Lol.

And good eye. Apparently, I could use the services of a good proofreader, also!?! (Rim-shot!?!) Will fix the code now.

(Fixed, now, btw...)