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I am looking for the best way to validate if asignature pen field on a form has been populated to use as a validation. I attempted to use the "IsBlank" function, and it does not recognize the field being blank. i.e. if(IsBlank(signpen_field.image), true, false).
One basic approach is to get the PenInput.Image. For example if this is part of a form editing scenario
- get the initial value when loaded on the form (for example, select the screen set the Onvisible as show below:
- compare it against the current value at the point the validation needs to be done. Below there is a textBox that shows "changed"/"NotChanged" to help visualize the state.
Iniital state onVisible
Compare Initial vs Current
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