Is numeric

There is no built-in is_numeric() function in JavaScript as there is in PHP. However, here is a simple is_numeric() function that you can copy and paste into your JavaScript:

The Function

  function is_numeric(input){
    return typeof(input)=='number';
  }

Warning! is_numeric() doesn't always work if you are validating form input! This is because form inputs are strings, even if the user typed a number.

When validating form input, use this:

  function form_input_is_numeric(input){
    return !isNaN(input);
  }

Created on: 12th October, 2022

Last updated: 12th October, 2022

Tagged With:

• javascript-snippet