Triggering LiveView Form Change Event from Javascript

Questions & Help Questions
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I’m trying to do the same but I’m running into a very pesky error where the hook dispatches the event just fine but LiveView appears to be crashing for some other reason. I am having a hard time debugging since this seems to be in the guts of LV.

Any help would be appreciated – I realize this is not much to go off of but maybe someone has experienced the same. Thank you!

Uncaught TypeError: Cannot read property 'querySelectorAll' of null
    at Object.all (phoenix_live_view.js:1716)
    at Object.showError (phoenix_live_view.js:1868)
    at eval (phoenix_live_view.js:2845)
    at Object.eval [as callback] (phoenix_live_view.js:2702)
    at eval (phoenix.js:232)
    at Array.forEach (<anonymous>)
    at e.value (phoenix.js:231)
    at Object.eval [as callback] (phoenix.js:250)
    at e.value (phoenix.js:405)
    at Object.eval [as callback] (phoenix.js:292)