Validating phone number in javascript

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"Bad data" are already filtered out when input is passed to the server-based program. Client side form validation usually done with javascript.For the majority of your users, Java Script form validation will save a lot of time up front, but double-checking the data on the server remains necessary, in case the user has turned Java Script off.In Java Script, regular expressions are also objects.These patterns are used with the exec and test methods.

Any interactive web site has form input - a place where the users input different kind of information.Next, we use the is Na N() function to check if the phone number contain only numbers.At last we check the length of the string and permit only phone numbers with 10 digits. When the user clicks the Submit button on the form, the form data is sent to a Java Script validation function that checks each field to make sure that it is in the appropriate format.If the required field is blank, we return the error string to the main function.If its not blank, the function returns an empty string.

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