Check if an input value evaluates to true.

Can be used in combination with a check box that must be checked on submit.

For example:

<input type="checkbox" id="accept" name="accept" value="1" />
{% validate id="accept" type={acceptance} %}


Argument Description Example
failure_message Message to be shown when the input is true. Defaults to “Must be accepted.” failure_message="Please agree to our TOS."

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