Validate checked checkboxes before allowing signature

[DAOJ]

I have a task list with a checkbox against each task. I would like a user to complete each task and check each matching checkbox to show the task is complete. Once and only once all tasks are complete should they be permitted to sign. How do I impose such a condition on the signature field?

[try67]

You can't do it directly. The way to do it is to hide the signature field entirely and use a (hidden) field's calculation script to determine if it should be made visible, based on the state of the check-boxes.

[DAOJ]

Thank you again.  That seems straight forward enough.  I'll give it a go and let you know if I have any issues.

[Mohamad32744384h15w]

Can also make read only.  Run this code in the checkbox field.

if(this.getField("[name of check box field]").value == "Off")
this.getField("[name of signature field]").readonly = true

else
this.getField("[name of signature field]").readonly = false