Learning jQuery

Now days registration forms have phone numbers as mandatory field. But how to validate the entered phone number is correct or not? In this post, I will show you how to validate the phone number using jQuery. To validate the phone number, I have created a function which based on input, returns true or false. It checks for the validity of phone number using regular expression.

//Code Starts
function validatePhone(txtPhone) {
    var a = document.getElementById(txtPhone).value;
    var filter = /^[0-9-+]+$/;
    if (filter.test(a)) {
        return true;
    }
    else {
        return false;
    }
}?
//Code Ends

The above regular expression allows only numerals and + or – signs. Based on your requirement you can modify this regular expression.

Now call this function to validate the phone number. For demo, I have used on blur event of textbox But It can be used on click on button or any another event. Based on the result, it updates the status in a span tag.

//Code Starts
$('#txtPhone').blur(function(e) {
   if (validatePhone('txtPhone')) {
       $('#spnPhoneStatus').html('Valid');
       $('#spnPhoneStatus').css('color', 'green');
   }
   else {
      $('#spnPhoneStatus').html('Invalid');
      $('#spnPhoneStatus').css('color', 'red');
   }
});
//Code Ends

See result below.

Feel free to contact me for any help related to jQuery, I will gladly help you.