Had minimal luck.
In the below code snippet, I tried to first prevent event propagation so it wouldn't upload just yet.
I had the following assumptions.
<html>
<input id="file-input" type="file">
</html>
...
<script>
let ignoreEventForSecondTime = false
document.getElementById("file-input").addEventListener("click", (event) => {
if (!ignoreEventForSecondTime) {
event.stopImmediatePropagation() // Don't actually upload yet
const input = event.target
validate(input.files) // I only want this to run after users have picked the files
ignoreEventTheSecondTime = true // Don't run this block after I refire the event
input.dispatchEvent(event) // The intention is to let whatever event listener handle uploading the files afterwards.
} else {
ignoreEventTheSecondTime = false
}
}, { capturing: true })
</script>
This seems to have worked. The problem was I couldn't just dispatch the same event I stopped propagation from, as well as changing from 'click' handler to 'change' handler so i can view files after the file dialog have completed.
<html>
<input id="file-input" type="file">
</html>
...
<script>
let ignoreEventForSecondTime = false
document.getElementById("file-input").addEventListener("change", (event) => { // LINE CHANGED
if (!ignoreEventForSecondTime) {
event.stopImmediatePropagation() // Don't actually upload yet
const input = event.target
validate(input.files)
ignoreEventTheSecondTime = true // Don't run this block after I refire the event
input.dispatchEvent(new Event('change', event)) // LINE CHANGED
} else {
ignoreEventTheSecondTime = false
}
}, { capturing: true })
</script>