Validating checkboxlist

If not, an alert is displayed and focus is moved to the checkbox.Not the prettiest solution, but functional in all browsers with Java Script enabled.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.We know that the checkbox is unchecked by default so we need to tell the browser what message to display.The event handler on the checkbox then toggles the error message.When the checkbox is valid (checked) the message is set to blank which tells the browser that it's ok for the form to be submitted.

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.When the checkbox is not checked and the Submit button is clicked an alert is displayed similar to the examples above, but using our text instead of the default.Here you can see the custom message being displayed in Firefox: Custom messages can be set in a similar manner for object states (validity.value Missing, validity.pattern Mismatch, ...) to determing the right message. The previous example was starting to become a bit cluttered with two Java Script script blocks as well as the The forms behaviour should be unchanged: While it looks much more complicated, this is a better solution because it allows for the HTML and Java Script to be maintained separately.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.

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