Exclude numbers

the joe · **Posts:** 71

Hello my friends, i have a simple question. I have a form to get the name and age of the user on two separate inputs. What should i do to validate that the name field has no numbers on it and the age input has no letters?

I've thought doing loops, or checking arrays, or matching characters. Also i've found statements like this " /^\d+$/" or "/[a-z]/gi", but since i dont know what they mean im not sure about using them, what are those for? :?:

Thanks

hakRme · **Posts:** 40

those statements are called regexp-regex-regular expressions, as those from perl.

their structure is like this /regex/modifier.

for example, i would use this to make sure there are only numbers on the 'age' input:

var result = age.match(/\D/);
if (result.length >0){alert ('Only numbers please');}

for no numbers on name you can use this

var result = name.match(/\d/);
if (result.length >0){alert ('No numbers please');}

notice that i didnt use any modifier.

this may not be completely right but at least it can gives you the idea.

off1 · **Posts:** 29

To validate only numeric characters on a field I use

if isNaN(age) {
     alert('The age must be a number')
     }
else { 
     // PROCESS FORM
     }

FORUMS » Client Side » JavaScript

Exclude numbers

FORUMS » Client Side » JavaScript