Java 8 Object Oriented Programming Programming. JavaScript Form Validation. Note: Remember that validation and verification both are different from each other. Password Regexp Test. In order to apply these validations, we have a simple “Create User” form having following fields. (input must contain at least one digit/lowercase/uppercase letter and be at least six characters long) If you want to restrict the password to ONLY letters and numbers (no spaces or other characters) then only a slight change is required. 2. 7 Comments 1 Solution 9282 Views Last Modified: 11/17/2013. Instead of using . How to validate that string contains only alphanumeric value with some spacial character and with whitespace and how to validate that user can only input alphanumeric with given special character or space in a textbox (like name fields or remarks fields). Write a function in JavaScript that will get the ASCII code of the key that will be pressed by the user and will return "true" if it is a letter or space otherwise "false". Generate an alert message if the name … The pattern attribute of the element allows you to add basic data validation without resorting to JavaScript. The zip file contains the javascript file, examples. 1. When User types in the TextBox, the text in the TextBox will be validated using OnKeyPress event handler in JavaScript and if the inputted character is not Alphabet i.e. Text-field data is passed in the function and if passed data is number then isNan () returns true and if data is not number or combination of both number and alphabets then it returns false. Validating a name entered by User. Let's take each field one by one with its validation code. Website: Optional. Email -> Standard Email format. 1. yup.string () .required ("Please enter the required field") .matches (/^ [aA-zZ\s]+$/, "Only alphabets are allowed for this field ") xxxxxxxxxx. allow only Letters (A-Z) using OnKeyPress event in JavaScript. The term family name is also a good substitute for last name. Note: The pattern attribute works with the following input types: text, date, search, url, tel, email, and password. It … I am using RAD Text box..I want to check that if user is entering the value in text box it should. 1. VALIDATE_ALPHA_LOWER - Lower case alphabets (a-z). Hi I want the regular expression for Name validation i.e. Username -> Only alphabet characters with dot (“.”) or dash (“-“). I think your choice of RegEx to validate names is missing the point: this is a huge unwieldy problem and, even if you massively restrict the scope of names you allow, you will forever suffer the risk of false negatives and you will be turning away people from other cultures and languages. That's how we validate the alphabet and spaces in a form using javascript. The expression is: /^ [a-zA-Z]+$/ The above expression checks whether the input characters in the string is alphabet or not. var isValid = pattern.test(String.fromCharCode(keyCode)); if (!isValid) { errorMsg.innerHTML = "Invalid Attempt, only alphanumeric, dash , underscore and space are allowed. You can then adapt this form to your own requirements. Name validation using javascript.