How to disable button when textfield is empty

Question

I make a textfield named 'nama' and button 'ayo'. I want to make the button disable when the textfield is empty. But when I try this code my button not disable and still working. I want the button disable before the textfield filling.

stop();
menumulaikuis();
var namasiswa:String;
var nama:TextField = new TextField();
namasiswa = nama.text;

nama.addEventListener(Event.CHANGE,handler);
function handler(event:Event){
    if (nama.text) {
        ayo.enabled = true;
        ayo.visible = true;
    } else {
        ayo.enabled = false;
        ayo.visible = false;
    }
}

score 1 · Accepted Answer · answered Dec 17 '15 at 15:37

You have some little problems in your code :

You should add your text filed to the stage using addChild() :

    var nama:TextField = new TextField();
    addChild(nama);

If your text field is for user's input, so its type should be input :

    nama.type = 'input';

To verify if a text field's text is empty, you can simply do :

    if(nama.text == ''){ /* ... */ }

So your text field's change handler can be like this :

function changeHandler(event:Event): void 
{
    if (nama.text != '') {
        ayo.enabled = true;
        ayo.visible = true;
    } else {
        ayo.enabled = false;
        ayo.visible = false;
    }
}

Hope that can help.

score 0 · Answer 2 · answered Dec 17 '15 at 20:08

0

If the Text Field isn't for user input, you cannot use the Event.CHANGE listener.

I suggest changing Event.CHANGE to Event.ENTER_FRAME; that should fix your problem.

answered Dec 17 '15 at 20:08

Naomi Dennis

26
4

That's wrong. The [`TextField`'s `Event.CHANGE`](http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/flash/text/TextField.html#event:change) event is fired with any `TextField` object even with a dynamic one. – akmozo Dec 18 '15 at 14:14
I see, I was referencing: http://stackoverflow.com/questions/977847/as3-textbox-change-event-not-firing – Naomi Dennis Dec 18 '15 at 19:52

How to disable button when textfield is empty

2 Answers2