Check whether an input string contains a number in javascript

My end goal is to validate an input field. The input may be either alphabetic or numeric.

Solution 1:

If I'm not mistaken, the question requires "contains number", not "is number". So:

function hasNumber(myString) {
  return /\d/.test(myString);
}

Solution 2:

You can do this using javascript. No need for Jquery or Regex

function isNumeric(n) {
  return !isNaN(parseFloat(n)) && isFinite(n);
}

While implementing

var val = $('yourinputelement').val();
if(isNumeric(val)) { alert('number'); } 
else { alert('not number'); }

Update: To check if a string has numbers in them, you can use regular expressions to do that

var matches = val.match(/\d+/g);
if (matches != null) {
    alert('number');
}

Solution 3:

function validate(){    
    var re = /^[A-Za-z]+$/;
    if(re.test(document.getElementById("textboxID").value))
       alert('Valid Name.');
    else
       alert('Invalid Name.');      
}

Solution 4:

This is what you need.

      var hasNumber = /\d/;   
      hasNumber.test("ABC33SDF");  //true
      hasNumber.test("ABCSDF");  //false