Flex Question: Can I use a ComboBox in Flex to change a view stack?

Question

I am trying to use a combobox in flex with an array to change to a canvas in a view stack. Can I do this with some custom action script? The UI I am designing could really benefit form this.

Answer 1

Here's a little demo app that demonstrates what you are trying to do:

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="vertical">

    <mx:Script>
        <![CDATA[
            import mx.core.Container;

            private function onComboBoxChange():void
            {
                stackNav.selectedChild = this[comboNav.selectedItem];
            }            

     ]]>
    </mx:Script>

    <mx:ComboBox id="comboNav" dataProvider="{['canvas1','canvas2']}" change="onComboBoxChange()"/>

    <mx:ViewStack id="stackNav" width="400" height="300">
     <mx:Canvas id="canvas1" width="100%" height="100%">
        <mx:Label text="Hello" horizontalCenter="0" verticalCenter="0"/>
     </mx:Canvas>
     <mx:Canvas id="canvas2" width="100%" height="100%">
           <mx:Label text="World!" horizontalCenter="0" verticalCenter="0"/>
        </mx:Canvas>
 </mx:ViewStack>

</mx:Application>

You can change the logic in onComboBoxChange() to use selectedIndex as well:

stackNav.selectedIndex = comboNav.selectedIndex;

Answer 2

Or you can bind the selectedIndex of the viewStack to the selectedIndex property of the combo:

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="vertical">
    <mx:ComboBox id="comboNav" dataProvider="{['canvas1','canvas2']}"/>

    <mx:ViewStack id="stackNav" width="400" height="300"
        selectedIndex="{comboNav.selectedIndex}">
        <mx:Canvas id="canvas1" width="100%" height="100%">
           <mx:Label text="Hello" horizontalCenter="0" verticalCenter="0"/>
        </mx:Canvas>
        <mx:Canvas id="canvas2" width="100%" height="100%">
           <mx:Label text="World!" horizontalCenter="0" verticalCenter="0"/>
        </mx:Canvas>
    </mx:ViewStack>

</mx:Application>

Answer 3

the other solution is not good you can not pike a word with space try to change "canvas1" to "canvas 1" and you will see !!!

[Bindable] private  var models:Array =  ["tasks","users","bugs"];
public function changeViewStackModel():void
{ //this.modelViewStack.selectedChild=users; //works
  //this.modelViewStack.selectedChild="users"; //does not work
  //this.modelViewStack.selectedChild=this.modelsCombo.selectedItem; //does not work
  switch(modelsCombo.selectedItem){
    case "tasks": modelViewStack.selectedChild=tasks; break;
    case "users": modelViewStack.selectedChild=users; break;
    case "bugs": modelViewStack.selectedChild=bugs; break;
  }
}

code MXML

<mx:ComboBox id="modelsCombo" dataProvider="{models}" selectedIndex="0" change="changeViewStackModel()"/>
    <mx:ViewStack x="29.25" y="55" id="modelViewStack" width="90%" height="200">
        <mx:Canvas id="tasks" label="Tasks"><mx:Label text="Tasks stack view!!"/></mx:Canvas>
        <mx:Canvas id="users" label="Users"><mx:Label text="Users stack view!!"/></mx:Canvas>
        <mx:Canvas id="bugs" label="Bugs"><mx:Label text="Bugs stack view!!"/></mx:Canvas>
    </mx:ViewStack>