IF Statement For Javascript

Question

I'm looking Jquery UI's modal form demo. But i want to add something. This demo checking all inputs' (name,email,password) lenght and validate them. But email input must be optional. Because of this i'm setting email input's min value (for checkLength() function) to zero. But when i leave blank email input i'm getting validation error. You can check full codes here .

It's validation email with this code :

bValid = bValid && checkRegexp( email, ..SOME REGEX PATTERNS WILL COME HERE.., "eg. [email protected]" );

But i want to try validation only if there is any email input. Because email input is optional and visitors can leave it. How can i add if statement (if email input is filled, validate it. Else don't try validation) to this code ? I hope it's clear.

Piskvor left the building · Accepted Answer · 2011-05-18 17:07:13Z

1

If you are saying "how to do validation only if email is not empty?", then I see no reason this wouldn't work:

var email = $( "#email" ); // taken from the linked code
if (email.val() != "") { // e-mail field value is not empty
  bValid = bValid && checkRegexp( email, ..SOME REGEX PATTERNS WILL COME HERE.., "eg. [email protected]" );
}

Note: if you actually have no idea how to use conditional statements in JS, you may have a lot of hurdles ahead of you. See this for a quick reference, and/or get a book about JS basics.

edited May 18, 2011 at 17:07

answered May 18, 2011 at 17:01

Piskvor left the building

93.1k46 gold badges182 silver badges226 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

Eray Over a year ago

i'm trying to use email.lenght === 0 condition but it's not work. I'll try this. thank you.

Piskvor left the building Over a year ago

@Eray: You're welcome. Where did you get that syntax? First, lenght is probably a typo; second, this would get you a number of elements matching #email - see the documentation.

Collectives™ on Stack Overflow

IF Statement For Javascript

1 Answer 1

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related