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.
Also you can use input data validation to force user to enter appropriate data type.
For a example if there is a text field in the form to enter the users age.
You can do these validation events such as onclick, mouse over, on change, etc.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.When filling forms, you may have seen there are some required fields to fill before you submit the form.If you are forget to fill such a field, you will be asked to fill that field to complete the process. That means they use Java Script to validate user inputs.