Verify triggers

Pre-transition triggers can optionally be fired whenever a transition link is clicked, but before the transition form is shown. In this way, a script can verify the constraints, before the user spends time filling out the form, only to find the transition was not permissible.

This function is a replacement for older TRELATIONs. Verify triggers continue to fire as part of a transition, after the form is filled. Marking them as verify only means that they are fired before the transition form. However, they fire during a transition as usual.

Pre-transition triggers must be explicitly marked as being verify triggers using the verify: prefix:

verify: bsf verifiy_associated_task_states.js completed

Note the following restrictions:

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