test.js

TXTextControl.addEventListener("inputPositionChanged", function (position) {

    // if input position is is not coherent, reset character array
    if (position.textPosition < trackedInputPosition - 1 || position.textPosition > trackedInputPosition + 1) {
        charCodes = [];
    }

    // set current input position
    trackedInputPosition = position.textPosition;
})

document.getElementById("txTemplateDesignerContainer").addEventListener("keydown", (event) => {

    // reset character array for all keys including ENTER, TAB and others except SPACE
    if (event.keyCode < 0x30 && event.keyCode != 32) {
        charCodes = [];
    }

}, true);