Custom Fields - Checkbox - Required

I need to have a consent from the user when he submits an event and there I have created a custom field to do so:

<field name="agreement" type="checkbox" label="Tick to agree and submit your event" size="1" description="Tick this box only if you agree that"></field>

Now I need to make it required for the user to have that field ticked before he can submit the event. How do I do this?

Thank you

Add class="validate[required]" to the checkbox code and it should work well

Tuan

Works wonderfully, thank you and Happy Easter

Great. Happy to hear that it works well for you. Happy Easter to you, too

Tuan