Validating date in java script

Using vanilla Java Script we can prevent form submission as follows: All this does is confirm before submitting the form that the checkbox is checked.

If not, an alert is displayed and focus is moved to the checkbox.

All you need to do is include a This tells the browser that the form should not be allowed to submit without the checkbox checked.

Some, but not all, browsers will recognise and enforce this: The advantage of the HTML5 form validation is that it happens before our Java Script is called, displays instructions and points the user to the relevant element.

Here you can see screen captures from Firefox and Chrome: Text alert messages are generated entirely by the browser and will even translate automatically into different languages - something that would be almost impossible using just Java Script.

The advantage for the user is that it's obvious whick element is causing the problem and there's no alert window that needs to be clicked away.

At time of writing Safari does not enforce input fields.

Basically you don't want the form to be submitted unless this is checked.

We know that the checkbox is unchecked by default so we need to tell the browser what message to display.

Not the prettiest solution, but functional in all browsers with Java Script enabled.

Adding HTML5 validation to the checkbox is actually very simple.

As you would hope it is possible to customise the messages that are displayed by the browser with your own text, but this can only be done via Java Script.

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You need to check the The block of Java Script below the form is assigning our custom error message to the checkbox when the page loads.

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