But of course you can put the relevant parts of the above code into a method.Validating a phone number using regular expression is tricky because the phone number can be written in many formats and can have extensions also.Example 1 The constructor of this class validates its arguments before doing anything else.to your method, forcing the exception handling to be outside the method.
After making all these changes our HTML now looks like this: https://jsfiddle.net/ianoxley/9C2JD/ The good news is that HTML form validation is supported by all the latest desktop browsers, and most mobile browsers.
Others, however, feel that manually documenting exceptions should be avoided.
If parameters are to be considered non-null unless explicitly stated otherwise.
A word of warning though: not all browsers implement the attribute accessibly, so it might not be picked up correctly in certain browser / screen reader combinations.
As such, current best practice recommends supplementing the required attribute with the aria-required=”true” attribute: Now that our users get prompted to complete required fields, we need to make sure that the data they submit is in the format we require.
The first lines of a method are usually devoted to checking the validity of method arguments.