Javascript function for validating date

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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.Server side validation is performed by a web server, after input has been sent to the server.Client side validation is performed by a web browser, before input is sent to a web server.

Validation can be defined by many different methods, and deployed in many different ways.

These functions can even be included from an external javascript file so that the browser can cache them, and so the programmer isn't always copying and pasting.

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.

The year limitation would be used if you were asking for a date of birth or date of some recent event.

If you're setting up a calendar of future events you would check that the year is the current year or greater.

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