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Validating date in javascript

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//Begin function checkdate function checkdate(input) //Begin function button1_onclick //This makes sure that even if it somehow got past the original error check, //the report won't run unless the date format is correct.

function button1_onclick(ctrl) //End function button1_onclick //This goes in the BODY portion of the HTML Add this phrase to any date control you want to call the function from: on Change="checkdate(this)" //We had to use onchange instead of onblur //because our call center software was interfering //with HTML code and causing the control to lose focus - // we ended up in an infinite loop of error messages.

The aim of this article is to validate date input in javascript.

When getting information from a user for insertion into a database, or use in other processing, it’s important to control what the user can enter.

When capturing information for insertion into a database, or use in other processing, it's important to control what the user can enter.

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').

There have been so many problems with users not entering the date in mm/dd/yyyy, even when specifically stated on the screen.

Otherwise you can end up with values in the database that have no relation to reality.

Javascript does not provide any method to achieve validation of date or even quite a lot of other kinds of validation.

Remember that your code shall be as clean as possible.

To begin, create a new HTML document and add the very basic syntax for writing HTML and Javascript like so: If more that one of the requirements is not met, like both date and month is invalid, only the alert of the first invalid input argument will be shown and you will be focused to the input again.4.