In this article, we shall learn how to do client side validation of the U. Java Script uses the client machine processing power.
It means the application will be more responsive because the load on the server is reduced.
In Java Script, regular expressions are also objects.
These patterns are used with the exec and test methods.
If the number is invalid, alert message will be displayed as ‘Phone number is not valid.
This java Script code determine whether a user entered phone number in a common format that includes 0999999999, 099-999-999, (099)-999-9999, (099)9999999, 0, 099 999-9999, (099) 999-9999, 099.999.9999 and all related combinations For this we use this regular expression: /^\(?
During web development, nearly always, we need to provide input validation on even simple web forms.
is Nan(is Not-a-Number)- is a bool keyword in Java Script to check either the object contains alphabets or not.
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".
Now we will see how we can validate our entered form data before submitting it to the web server.
The following example shows how to validate an entered email address.
Server-side validation has its own use and it should be there but restricting user at the beginning is always needed.