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edit text maximum length

Participant ,
Dec 22, 2016 Dec 22, 2016

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Do not write more than 8 characters

How to limit character

var w= new Window ("Section");

var prefix = w.add("edittext", undefined, "")

prefix.onChanging = function () {

if(prefix.text.length >=9){

    prefix.text.substring(0,9); //???

    }

}

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Scripting

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correct answers 1 Correct answer

Community Expert , Dec 23, 2016 Dec 23, 2016

Please don't suggest code that does not work correctly to begin with! The first argument of "Window" must be "dialog", "window", or "palette".

You have (or should have) enough scripting experience to be able to see that your line is only half correct. You take a substring from something ... and then what? You throw it away!

This fixes your immediate problem:

prefix.onChanging = function () {

if(prefix.text.length > 8){

    prefix.text = prefix.text.substring(0,8);

    }

}

But -- as stated in several oth

...

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Engaged ,
Dec 23, 2016 Dec 23, 2016

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Community Expert ,
Dec 23, 2016 Dec 23, 2016

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Please don't suggest code that does not work correctly to begin with! The first argument of "Window" must be "dialog", "window", or "palette".

You have (or should have) enough scripting experience to be able to see that your line is only half correct. You take a substring from something ... and then what? You throw it away!

This fixes your immediate problem:

prefix.onChanging = function () {

if(prefix.text.length > 8){

    prefix.text = prefix.text.substring(0,8);

    }

}

But -- as stated in several other posts that use onChanging -- it's very annoying that the cursor position gets reset. I found this post very illuminating: Edittext and onChanging event  and so I came up with the following.

var w= new Window ("dialog","Section");
var prefix = w.add("edittext", undefined, "")
prefix.characters = 8;
prefix.addEventListener ('keydown', rejectTooLong );

w.show();

function rejectTooLong (event)
{
  var obj = event.currentTarget;
  if (obj.text.length >= obj.characters)
  {
  if ({"Backspace":1,"Escape":1,"Return":1}[event.keyName]==null)
  {
    event.stopPropagation();
  event.preventDefault();
}
  }
}

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Advisor ,
Dec 23, 2016 Dec 23, 2016

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You are close enough.

Just need to remember that in JS strings are immutable, so string.substring returns a new string, does not change the original one.

so..

prefix.text=prefix.text.substring(0,9); //???

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