Solved

>>  javscript validation for url

Posted on 2009-05-07
9
474 Views
Last Modified: 2012-05-06
Hi Guys,

I have a form where I'm collection a url.  An example of correct input in this field would be 'google.com' or 'anyotherdomain1234.com'

So basically I guess I just need a regex or regular javascript code to make sure that it has a '.[TLD]' at the end.

Thanks!!!  : )

Johnny

0
Comment
Question by:webgeek154
9 Comments
 
LVL 4

Expert Comment

by:Ronb23
Comment Utility
you can try something like this:

function vTLD(){
var knownTLDs=".com .net .org .edu .gov .biz .info";

var myURL = document.myform.url.value;
var endofString = myURL.split('.');
var ending = endofString.length - 1;
var tld = endofString[ending];
   if (knownTLDs.search(tld) < 0){
      alert('Invalid URL');
      return false;
   } else {
      return true;
   }
}
0
 
LVL 54

Expert Comment

by:b0lsc0tt
Comment Utility
webgeek154,

It can be hard to make a regular expression that will test for domain name, even just the TLD part.  Do you need to support domains besides .com?  Any international domains?  The more domains you need to allow the longer the regex and generally the less specific it is (i.e. it doesn't look for .com, etc but just the right number of characters in the TLD).  The regex in Javascript's match for the domains you mentioned would be ...

if (field.value.match(/\.com$/i)) {
   // it does match
}

To add a few more TLDs, like those listed by Ronb23 would not be hard.  I do have some regex that will check domain names according to specs but even those aren't fool proof and may be overkill if you know the domains entered will only be certain types.

Let me know if you have any questions or need more information.

b0lsc0tt
0
 
LVL 51

Accepted Solution

by:
ahoffmann earned 250 total points
Comment Utility
if (field.value.match(/\.(?biz|com|de|es|fr|ga|hu|info|jp|za)$/i)) {
   // it does match; but ther're much more TLDs
}
0
 
LVL 54

Assisted Solution

by:b0lsc0tt
b0lsc0tt earned 250 total points
Comment Utility
ahoffmann,
It is a Monday and I have been using Regexes a little less recently so maybe I am wrong but I think you have a small typo.  Doesn't the ? character in your regex need the colon after it.  I believe you are trying to make that group a non-capturing group.  Just wanted to post this in case I am right so there wouldn't be a problem with the Asker using your code.
if (field.value.match(/\.(?:biz|com|de|es|fr|ga|hu|info|jp|za)$/i)) {
bol
0
Do You Know the 4 Main Threat Actor Types?

Do you know the main threat actor types? Most attackers fall into one of four categories, each with their own favored tactics, techniques, and procedures.

 
LVL 51

Expert Comment

by:ahoffmann
Comment Utility
good catch b0lsc0tt.
0
 
LVL 54

Expert Comment

by:b0lsc0tt
Comment Utility
ahoffmann,
Your welcome!  Glad to help and that my regex skills aren't gone completely. :D
webgeek154,
If you use Ahoffmann's code then please no credit to me for the change.   It was very minor and would've been caught by Ahoffmann had you posted about a problem.  If you are around it would be great to get some comment and feedback though.  You have plenty to work with now.
bol
0
 
LVL 54

Expert Comment

by:b0lsc0tt
Comment Utility
webgeek154,
Thanks for closing this.  It seems from your comment you acknowledge we (ahoffmann and I) both helped.  You probably meant to split the points and accept both comments.  That didn't happen though.
I am going to use Request Attention to have a moderator reopen this and correct how it was closed.  Please post if you disagree with my efforts and explain why.  Thanks for the fun question and credit.  I am glad I could help a bit.
bol
0
 

Author Closing Comment

by:webgeek154
Comment Utility
thanks guys!!!
0

Featured Post

Why You Should Analyze Threat Actor TTPs

After years of analyzing threat actor behavior, it’s become clear that at any given time there are specific tactics, techniques, and procedures (TTPs) that are particularly prevalent. By analyzing and understanding these TTPs, you can dramatically enhance your security program.

Join & Write a Comment

Suggested Solutions

Title # Comments Views Activity
jQuery Animate Left Right 2 43
Create a new template 9 20
JavaScript error 1 32
Remove Protocol if at start of string? 3 11
Article by: DanRollins
This article describes a JavaScript program that creates a maze made of hexagonal cells.  In Part 2 (http://www.experts-exchange.com/Programming/Languages/Scripting/JavaScript/A_7850-Hex-Maze-Part-2.html), we'll extend the program by adding a depth-…
This article discusses the difference between strict equality operator and equality operator in JavaScript. The Need: Because JavaScript performs an implicit type conversion when performing comparisons, we have to take this into account when wri…
The viewer will learn the basics of jQuery, including how to invoke it on a web page. Reference your jQuery libraries: (CODE) Include your new external js/jQuery file: (CODE) Write your first lines of code to setup your site for jQuery.: (CODE)
The viewer will learn the basics of jQuery including how to code hide show and toggles. Reference your jQuery libraries: (CODE) Include your new external js/jQuery file: (CODE) Write your first lines of code to setup your site for jQuery…

762 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

9 Experts available now in Live!

Get 1:1 Help Now