checking whether textfield contains letters in javascript

Question

I am new at Javascript and I wanted to know if there is a way to check if textfield input contains anything other than numbers.

I know how to do that in Java, but Ja

Answer 1

Yup - just standard regex on the string:

var str = 'mystring 123';
if(str.match(/[^0-9]/)) { ... }

If you need to know how to get the string from the element:

var str = document.getElementById('myId').value;