The output will be almost identical to the earlier examples.
In this simple example we can even rewrite the In practice most modern browsers will now use HTML form validation to preempt any Java Script validation - with the notable exception of Safari. Visitors from some countries may find it confusing that we're using the and vice-versa as the year and day values have now changed position.
Each of these values is then tested against an allowed range (days: 1 - 31; months: 1 - 12; years: 1902 - 2019; and so on).
is an open source component of Wrapp and is licensed under the MIT license.
There are no required external dependencies at all!
In this case, we've created a stand-alone functions which will validate a date field: In each case the value passed to the function is the form field rather than the field value.
It does not check for leap years or invalid dates at the end of short months.
As we've seen before, creating re-usable functions can significantly reduce the size of your Java Script code.
Instead we're going to make use of Form Validation using Ajax to do some real-time checking using a server-side PHP script to get a definitive answer.
When you enter a date in the format dd/mm/yyyy the value is sent via an Ajax call to the server where it is validated using the PHP checkdate function.
In this example, the date fields will only accept input that matches the pattern 'dd/mm/yyyy' (this could just as easily be changed to 'yyyy-mm-dd' or 'mm/dd/yyyy').