Difference btwn xfa.event.change and xfa.event.newText pls?

Hello
I tried to figure out the difference between xfa.event.change and xfa.event.newText in google, but did not see any such!
Pls. could you clariy my question that what is the differenvce between these 2 (xfa.event.change and xfa.event.newText)?
Thank you

Thank you. With out having much knowledge on JS, i wrote the below JS
myFomr.Page2.mySubform21.myCheckBox211::exit - (JavaScript, client)
// To  check this check box, bank acct # is must to enter by user
if (this.rawValue == "X"){
if ((xfa.resolveNode("myFomr.Page2.mySubform21.BankNumber").rawValue == null) || (xfa.resolveNode("myFomr.Page2.mySubform21.BankNumber").rawValue == "")) {
    xfa.event.change = "";
My impression was, i can change a value (in the above case am unchecking the check box by populating it with ""/space) of any (text, check box, drop-down) field on the form explicitly by using this script
(xfa.event.change = "";),
i already placed in around 20 locations, so, pls. suggest me do i need to correct all these 20 locations, kind of risk/tediuos at this point or is it ok that leave as is?
Thank you

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