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

You can use isNaN() to check if the input is a number or not.

HTML:

JavaScript:

function checkInput()
{
  var textCheck = document.getElementById("inputText").value;
  if(isNaN(textCheck))
  {
    document.write("contains letters");
  }
  else
  {
    document.write("only numbers");
  }
}