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

Posted by Reuben Rail
Reuben Rail
3,338 Points

Why do the named functions fire without parenthesis "()" and fail with parenthesis?

Why does the following code work without parenthesis after the function names.....

$password.focus(passwordEvent).keyup(passwordEvent).keyup(confirmPasswordEvent).keyup(enableSubmitEvent);
$confirmPassword.focus(confirmPasswordEvent).keyup(confirmPasswordEvent).keyup(enableSubmitEvent);
enableSubmitEvent();

.......but this code does not.......

$password.focus(passwordEvent()).keyup(passwordEvent()).keyup(confirmPasswordEvent()).keyup(enableSubmitEvent());
$confirmPassword.focus(confirmPasswordEvent()).keyup(confirmPasswordEvent()).keyup(enableSubmitEvent());
enableSubmitEvent();

1 Answer

James Bradd
James Bradd
4,597 Points
James Bradd
James Bradd
4,597 Points

For that, you are not calling the function, you are just telling it what function will be the handler for that event type. You are telling jquery which function to call, not calling it yourself.

Jimmy Palelil
Jimmy Palelil
9,565 Points
Jimmy Palelil
Jimmy Palelil
9,565 Points

And you dont even need to call enableSubmitEvent() at the end of the code. I dont know why that was not rectified in the end. Confused the hell out of me until i tired it myself.