Validating a checkbox in javascript

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.

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 you're using Safari or another unsupporting browsers all the examples will just display the Java Script alert box.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.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.presence is obviously not an option and "equality : true" is not working either.There are times when we need to add javascript validation to check if at least one of a group of checkbox options has been checked.

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Here is a simple function that’ll solve the problem and works in most of the browsers.

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