Javascript Is Numeric function

28. Feb, 2008 5 Comments

function is_numeric(value){
	return !!isNaN(value);
}

if(!is_numeric('1234five')){
	alert('Please enter only numeric value!');
}

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awake Reply 06. May, 2009 at 11:31 pm

very helpful madame…
Brian Reply 15. May, 2009 at 6:27 am

Doesn’t seem to work in Firefox 3.0.10 on Ubuntu Linux. (All strings return True.)
Binoculars Reply 11. Oct, 2009 at 7:43 am

Hello! I like the design of your blog (and content too btw) and I would like to know what theme are you using? Is it your own design or free theme? thanks in advance, regards Pete
Binoculars Reply 11. Oct, 2009 at 7:46 am

Hey, thanks for the blog post, but can you tell me what’s this theme you’re using in your blog? Thanks in advance, Pete
Andy Reply 21. Jun, 2010 at 4:16 pm

There may be a typo in the function that may explain Brian’s problem.

Shouldn’t it be:

function is_numeric(value){
return !isNaN(value);//single !
}