PowerApps Pen Input check

Example case: The submit button only enables when the pen input (Signature) is filled.

 

Old way

App.OnStart	Set(initialTeamLeaderSig, penManagerERS.Image);
Pen.OnSelect	Set(TeamLeaderSig, penTeamLeaderERS.Image)
Button.DisplayMode	If(TeamLeaderSig <> initialTeamLeaderSig, DisplayMode.Edit, DisplayMode.Disabled)

Issue: when user clicks and not draw anything, the button still enabled.

 

New way

Screen.OnVisible	UpdateContext({locTeamLeaderSigBlank: JSON(PenInput1.Image, JSONFormat.IncludeBinaryData)})
Pen.OnSelect	UpdateContext({locTeamLeaderSigCurrent: JSON(Self.Image, JSONFormat.IncludeBinaryData)});
ResetBtn.OnSelect	Reset(PenInput1); UpdateContext({locTeamLeaderSigTimerStart: false}); UpdateContext({locTeamLeaderSigTimerStart: true});
Timer.Start	locTeamLeaderSigTimerStart
Timer.Visible	false
Timer.OnTimerEnd	UpdateContext({locTeamLeaderSigCurrent: JSON(PenInput1.Image, JSONFormat.IncludeBinaryData)});
Timer.Duration	50
SubmitBtn.DisplayMode	locTeamLeaderSigBlank<>locTeamLeaderSigCurrent