Let's take each field one by one with its validation code.
First, a User Full Name field that will allow entering only alphabets and a space character. For example, my son's complete name will be "Muhammad Ahmad".
During web development, nearly always, we need to provide input validation on even simple web forms.
And in the case of the web, Java Script is the best option available for validating input client-side.
Sometimes situations arise (input a phone number, zip code or credit card number) when the user should fill a single or more than one fields with numbers (0-9) in an HTML form.Server-side validation has its own use and it should be there but restricting user at the beginning is always needed.So, in this web development article, I am trying to present some requirements to limit the scope of the article, which are as follows: So, Java Script functions are explained along with each field for understanding.You can write Java Script scripts to check the following validations.To check for all numbers in a field To get a string contains only numbers (0-9) we use a regular expression (/^[0-9] $/) which allows only numbers.