var attempt = 3; //Variable to count number of attempts ............ Element By Id("username").disabled = true; Element By Id("password").disabled = true; Element By Id("submit").disabled = true; return false; } } }/* Below line is used for online Google font */ @import url(https://fonts.googleapis.com/css?
One of the features of HTML5 is the ability to validate most user data without relying on scripts.The expression for matching numbers and characters in the field is: /^[0-9a-z A-Z] $/ It’s must to provide validation in the select field.It happens sometimes, when user forgets to choose option from the select feild.Live demo: Longmuir/pen/Wb Oydx data-validate is injected in all the input fields of your form but when using js Form Validator, you don't require this heavy syntax and the validation will be applied to your form in one shot, without need to touch at your HTML code.While you should always validate data on your servers, additional validation of data on the Web page itself has multiple benefits. By validating form data while the user is filling it out, the user can know immediately if they've made any mistakes; this saves the time of waiting for an HTTP response and saves your server from dealing with bad form input.In our example, we have a login form with two input fields i.e.
username and password, As user clicks on login button, Java Script validation function comes into act.
escaping - by -) [0-9] : It matches digital number from 0-9. That means, you could be very sure about the form, whether users have entered the details or not.
Validation codes will return an alert message, if it finds some empty fields in the form.
If the string value is numeric, it will return true, otherwise it will return false.
By combining the expression for numbers and alphabetic characters, there is an expression that checks, whether the entered things includes numbers and alphabetic character or not.
function text Numeric(inputtext, alert Msg) // Function that checks whether input text is an alphabetic character or not.