I have not seen this particular problem addressed here but maybe I have missed it despite searching. When I try to capture keyboard inputs in Processing (such as with the keyPressed function), the code works about 2/3 of the time. Other times, the code runs but keyboard input is ignored. I run the e…

Hi @beckerc , I just checked you code and I have no issue on my computer. Be sure to click inside the window to make it active.

Thanks jb4x. I was getting keyboard input to work sometimes without clicking on the window which was throwing me. However, you are right, in that if the code is not responding, clicking on the window will work. Is there a way to select the window with code so that a user doesn’t have to click the m…

Hi @beckerc , was looking for a solution to this issue aswell, couldn’t find one out there but found my own solution that works flawlessly for me, in setup put, surface.setVisible(true); surface.setVisible(false); will hide the display window but setting it to true makes it active, please let me kno…

[image] beckerc: Is there a way to select the window with code so that a user doesn’t have to click the mouse on the window? Yes! An additional way: Robot (Java SE 17 & JDK 17) declaration: module: java.desktop, package: java.awt, class: Robot Also s…

I have used the following entered in Setup: surface.setVisible(true); I can tell you that it works. Fred

keyPressed() only works sometimes

Processing Coding Questions

glv April 23, 2026, 4:59pm 5

Yes!

An additional way:

Also see:
Keyboard Entry Seems To Need Mouse Click To Work

:)

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keyPressed() only works sometimes

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