Calling the onPress function, programmatically, from a different script

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I’m working on ETA’s token spawner (the button in the bottom-left corner), and I’ve run into a problem. When the user clicks on a button, that button becomes selected. If another button is then selected, the first should become un-selected. I have written script that should de-select any other buttons that are selected by calling the onPress function of the relevant scripts (cyan/gold/green/magentaButton.js, lines 47 - 60). However, this causes a number of problems. The problem reported by PlayCanvas is a TypeError:

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An example of the relevant scripts:
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The commented script just below the onPress() function is a copy-paste of a similar script: ruler.js

The strange thing is, this error only appears when trying to select multiple token buttons. When using ideal input (de-selecting a button manually before selecting another), this TypeError is never thrown. Any idea why calling the onPress() function without actually clicking the relevant entity would throw such an error?

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The onPress function is expecting an event object to be passed to it but when you call pragmatically, you don’t pass any parameters hence event is undefined.

A couple of ways to fix this:

  • don’t use event in the onPress function as it looks like you don’t need it for the current logic
  • create separate functions to select and deselect the button
  • create an event object to pass when calling the onPress function

I personally prefer option 2. onPress is an input callback and practice wise, shouldn’t be called programmatically.

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