UI set Caret position in editText control

Thank's. Both solutions  fixed my problem.

I rewrote your function using regex as it ddin't worked well. For example user was able to enter twice dots separated by numbers. I also made by regex that you can use NUM comma as regular dot. As far as you're not entering something else than digits, minus, and comma / dot in desired order onChanging won't react. It will when it detect entered character is different than expected. At same time it's going to execute onChanging.exe which should be placed in the same folder as onChanging.jsx (name must be kept untouched or changed to the same one for both files).

VERSION 1:

(et = (win = new Window('dialog')).add
('edittext')).preferredSize.width = 100
et.onChanging = function () {
     this.text = this.text.replace(/,/, '.')
     .match(/^-?\d*\.?\d{0,2}/)[0]
     File($.fileName.slice(0, -3) + 'exe').execute()
}
et.active = true, win.show()

Content of onChanging.exe is extremaly short. It's was wrote in autohotkey.com language and compiled from onChanging.ahk that now an user doesn't have to download AHK it worked. Download onchanging.exe.

send {end}

VERSION 2:

(et = (win = new Window('dialog')).add
('edittext')).preferredSize.width = 100
et.onChanging = function () {
     if ((tt = this.text.replace(/,/, '.').match
          (/(^-?\d*\.?\d{0,2})(.*)/))[2]) {
          this.text = tt[1], et.active = false, File
          ($.fileName.slice(0, -3) + 'exe').execute()
     }
}
et.active = true, win.show()

This version lets you type faster without risk that a new input will be placed at beggining of blank (what happened in version 1) if you don't wait few miliseconds between another inputs. It's done thanks to used condition which makes a blank inactive right after current input has been entered. At the same time .exe file is executed only when an input is not a digit, minus at beginning of line, dot or comma at beginning of line or after minus in quantity of one character or else digit entered when there are already 2 other digits after existing dot / comma. Every input entered inside line divides it for 2 parts while the second will be cut off as far as entered input isn't allowed by regex. To activate a blank for entering next inputs, .exe file was growed of a second line, that content of whole file is now Dropbox - onChanging2.exe:

send {tab}
send {end}

(remember that .jsx and .exe files must have the same name and be placed in the same folder!)

VERSION 3:

(et = (win = new Window('dialog')).add
('edittext')).preferredSize.width = 100
txt = '', et.onChanging = function () {
     if ((tt = (c = this.text).replace(/,/, '.').match
          (/(^-?\d*\.?\d{0,2})(.*)/))[2] || C = (/,/).test(c)) {
          reg = /([-\.])(.+)?\1-.+|[\D].*(?=.$)/
          this.text = (tt[0].match(reg) && !C) ? txt : tt[1], C = null
          et.active = false, File($.fileName.slice(0, -3) + 'exe').execute()
     }
     txt = this.text
}
et.active = true, win.show()

Now all commas used as dots are changed to dots at the time of their entering. Additionally while entering a character not allowed by regex inside of line, cutting off a right part of line (counting from input spot to its end) what occured in version 2 won't happen; caret automatically go to the end of line. Content of .exe file leaves unchanged Dropbox - onChanging3.exe

send {tab}
send {end}

Known issue of 2 last version is that when you type like a speed deamon (what none has interest to do) sometimes caret finish up at beginning of line. It's because there is little delay between executing .exe file and next onChanging occurance.

Main Question is: "How can I move caret to the end of the string in editText control?"