Behavior of ComboBox?

Hello

I use Flash Builder 4.0.

I'm confused about the behavior of the combobox when an item is deleted in the dataprovider.

Here is the intervention of the user

Step 1: The user has entered a name in the texfield

Step 2: The user clicks on a button

Step 3. Name is added to the ComboBox by using the ArrayCollection data provider collection (converter use element to display the button remove for each item)

Step 4. Repeat steps above three times to fill three items in the combobox

Step 5: Select the second element.

Step 6: Open the drop-down list and deletes the first element

Step 7: Now the selected item is the third point! ... not the second item that was selected in step 5.

How the last item gets selected?

I think that flex doesn't bother around which the article previously selected, it goes ahead and selects the index selected previously.

I reason?

If Yes, what is the work around?

______________________________

Thanks for your time.

Rabin.

Here's the code for the 3 files I used for the prototype.

Main application.mxml

<? XML version = "1.0" encoding = "utf-8"? >

" < = xmlns:fx s:Application ' http://ns.Adobe.com/MXML/2009 "

xmlns:s = "library://ns.adobe.com/flex/spark".

xmlns:MX = "library://ns.adobe.com/flex/mx" minWidth = "955" = "600" minHeight

creationComplete = "application1_creationCompleteHandler (event)" >

< fx:Script >

<! [CDATA]

How to import events. UserReportFilterDeleteEvent;

Import mx.collections.ArrayCollection;

Import mx.controls.Alert;

Import mx.core.FlexGlobals;

Import mx.events.FlexEvent;

Import mx.utils.object_proxy;

Import spark.events.IndexChangeEvent;

[Bindable]

private var ac:ArrayCollection = new ArrayCollection();

private var previousObject:Object;

protected function button1_clickHandler(event:MouseEvent):void

{

ac.addItem (ti.text);

}

protected function application1_creationCompleteHandler(event:FlexEvent):void

{

FlexGlobals.topLevelApplication.addEventListener (UserReportFilterDele teEvent.FILTER_DELETED, deletedHandler);

}

private void deletedHandler(e:UserReportFilterDeleteEvent):void

{

var object: = e.data;

ac.removeItemAt (ac.getItemIndex (object));

}

[]] >

< / fx:Script >

< s:layout >

< s:HorizontalLayout / >

< / s:layout >

< s:TextInput id = "ti" / >

< s:Button label = "Add" click = "button1_clickHandler (event)" / >

< s:ComboBox id = "cb" dataProvider = "{ca}" itemRenderer = "converters. FilterRenderer"/ >

< / s:Application >

FilterRenderer.mxml

<? XML version = "1.0" encoding = "utf-8"? >

" < = xmlns:fx s:ItemRenderer ' http://ns.Adobe.com/MXML/2009 "

xmlns:s = "library://ns.adobe.com/flex/spark".

xmlns:MX = "library://ns.adobe.com/flex/mx".

autoDrawBackground = "true" >

< s:layout >

< s:HorizontalLayout / >

< / s:layout >

< fx:Script >

<! [CDATA]

How to import events. UserReportFilterDeleteEvent;

Import mx.core.FlexGlobals;

protected function button1_mouseDownHandler(event:MouseEvent):void

{

var deleteEvent:UserReportFilterDeleteEvent = new UserReportFilterDeleteEvent(UserReportFilterDeleteEvent.FILTER_DELETED,data);

FlexGlobals.topLevelApplication.dispatchEvent (deleteEvent);

}

[]] >

< / fx:Script >

< s:Label text = '{data}' / >

< s:Button label = 'X' width = mouseDown = "button1_mouseDownHandler (event)"28"" / >

< / s:ItemRenderer >

UserReportFilterDeleteEvent.as

package events

{

import flash.events.Event;

SerializableAttribute public class UserReportFilterDeleteEvent extends Event

{

public static const = "filterDeletedUserReportFilterDeleteEvent" FILTER_DELETED:String

public var: data object;

public void UserReportFilterDeleteEvent (type: String, object: data, bubbles: Boolean = true, cancelable: Boolean = false)

{

This.Data = data;

Super (type, bubbles, cancelable);

}

override public function clone (): event

{

return new UserReportFilterDeleteEvent(UserReportFilterDeleteEvent.FILTER_DELETED,data,bubbles,cance lable);

}

}

}



I save the selectedItem before delete, use getItemIndex to find after the deletion, and then set selectedIndex.

Tags: Flex

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                    }
     
                }
     
            }
     
        }
     
     
     
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            public EditingCell() {
     
            }
     
            
     
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                super.startEdit();
     
     
     
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                }
     
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                setGraphic(textField);
     
                textField.selectAll();
     
            }
     
            
     
            @Override public void cancelEdit() {
     
                super.cancelEdit();
     
                setText((String) getItem());
     
                setGraphic(null);
     
            }
     
            
     
            @Override public void updateItem(String item, boolean empty) {
     
                super.updateItem(item, empty);
     
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                    setText(null);
     
                    setGraphic(null);
     
                } else {
     
                    if (isEditing()) {
     
                        if (textField != null) {
     
                            textField.setText(getString());
     
                        }
     
                        setText(null);
     
                        setGraphic(textField);
     
                    } else {
     
                        setText(getString());
     
                        setGraphic(null);
     
                    }
     
                }
     
            }
     
     
     
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        public static void main(String[] args) { launch(args); }
     
    }
     

    I think you should start by defining your model; simply copy the class Person here is obviously not going to work. It is difficult to incorporate the ComobBox until you have data to define this option is selected. Once you have defined your data model, which is a class whose instances represent each row in the table, then it should be much easier to understand how to write the updateItem (...) method.

  • Model of multiple selection for ComboBox

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    "As in the ListView, it is possible to change the SelectionModel which is used, although this is likely to be rarely changed. The default SelectionModel used in ComboBox is a SingleSelectionModel, but that can be sorted on by developers to instead allow multiple selection occur, or to change the behavior of the various methods provided in these APIs. "

    Yet when I try to set the selection model as I would to a listview using the following
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    The javadoc you cite above is in fact wrong and comes from an era where the selectionModel property of type «SelectionModel» ComboBox Since then, it has evolved to be "SingleSelectionModel. Which means, of course, you can put some instance of model selection in the ComboBox, but only choice will be always supported. We did it as multiple selection has no real meaning without drastic changes to the UI and UX, and we thought that a separate control could be developed in the future to better support this use case.

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  • DropDownList / ComboBox DataProvider outcome

    In this example, I have an ArrayCollection (values) collection that serves as a DataProvider and Bindable (value) field.  I want to twoWay binding value and dynamically load values.  When you dynamically load values, my stubborn value is null.

    I have two applications below, in the first example the dataprovider is initialized with all its values and the behavior is correct:

    <? XML version = "1.0"? >

    " < = xmlns:fx s:Application ' http://ns.Adobe.com/MXML/2009 "xmlns:s ="library://ns.adobe.com/flex/spark"> "

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    < / s:layout >

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    A < fx:String > < / fx:String >

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    "{< s:ComboBox id ="comboBox"selectedItem="@{value} "dataProvider ="{values}"/ >

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    " < = xmlns:fx s:Application ' http://ns.Adobe.com/MXML/2009 "xmlns:s ="library://ns.adobe.com/flex/spark"> "

    < fx:Script > <! [CDATA]

    private function comboxCreated (): void {}

    values.addItem ("A");

    values.addItem ("B");

    values.addItem ("C");

    }

    []] > < / fx:Script >

    < s:layout >

    < s:VerticalLayout / >

    < / s:layout >

    < fx:Declarations >

    < fx:String id = 'value' > B < / fx:String >

    < s:ArrayCollection id = "values" / >

    < / fx:Declarations >

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    Kind regards

    I tried this and it seems to work very well - just moved the setting to the value of 'value' to the creationComplete handler:

    http://ns.Adobe.com/MXML/2009"xmlns:s ="library://ns.adobe.com/flex/spark">

    private function comboxCreated (): void {}

    values.addItem ("A");

    values.addItem ("B");

    values.addItem ("C");

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    }

    ]]>

  • AS2 ComboBox Dir crashes when the + 200% scaling

    Hi all

    I used the AS2 ComboBox in an AS2 SWF for Flash Player set nav screen in the range of 7 (and tested up to 9).

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    The SWF has behaviors pre-made - 'Flash Cursor' and 'define the Modes of click '.


    During the observation, I see that the emphasis on selection is slow. The glow of the fireplace both my selections. I noticed that the mouse cursor does not change with the buttons on the combobox control's drop-down list.

    When I select the element, the player withdraws. It seems that most of the time it ends by returns and complete action - action image simple goto.


    I expect to use the ComboBox component to my users non-programming with this project template I created. I don't really want to create a custom, modifiable component if I can avoid it.

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  • Interaction of development ignition ComboBox/TextArea

    I have a ComboBox that is configured to change the font size of the text in a text box.  If I set the ComboBox control to make the focus to the text box in the change event, it causes the ComboBox to require 2 clicks to make a selection.  Here is a simple application showing the behavior I am seeeing:

    <?xml version="1.0" encoding="utf-8"?>
    <s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" 
                      xmlns:s="library://ns.adobe.com/flex/spark" 
                      xmlns:mx="library://ns.adobe.com/flex/mx">
         <fx:Script>     <![CDATA[
                   import flashx.textLayout.edit.IEditManager;
                   import flashx.textLayout.formats.TextLayoutFormat;
    
                   protected function sizeChange():void {
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         ]]>     </fx:Script>
         <s:VGroup>
              <s:TextArea id="textArea" />
              <s:ComboBox id="comboBox" change="sizeChange()">
                   <s:dataProvider>
                        <s:ArrayList>
                             <fx:int>10</fx:int>
                             <fx:int>12</fx:int>
                             <fx:int>14</fx:int>
                             <fx:int>16</fx:int>
                             <fx:int>24</fx:int>
                             <fx:int>32</fx:int>
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                   </s:dataProvider>
              </s:ComboBox>
         </s:VGroup>
         
    </s:Application>
    

    It looks like the editor interaction.  I would not want the ComboBox control to never get

    focus so I would ignore the call to setFocus and fair value tabFocusEnabled = false and

    mouseFocusEnabled = false;

  • Function of processInputField private ComboBox...

    I have a spark ComboBox that shows a list of names of people, in the format: last, first.

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    Please fill in a bug.

  • A new spark ComboBox item does not appear in textInput?

    I played with s:ComboBox and generally like them a lot. A detail is driving me crazy if is - most likely due to my lack of knowledge in this matter - that if I try to add a new item to my dataprovider in a changeHandler (recorded for the change event) the text for the ComboBox, textInput disappears - while adding item works perfectly. Interestingly enough the same operation works very well if it is called by clicking on a button, that is after the change event has been processed and the text does not disappear. To better understand what I'm talking about check out the code of http://help.adobe.com/en_US/flex/using/WS70f0d54f063b9b081aac8d1d1247252e4a0-8000.html#WS7 0f0d54f063b9b08626480d2124725f692c-7fff

    try to add a new item and press ENTER. Taking the same code of myCB_changeHandler and to use it as a button click event instead of a change event handler gives the behavior that I'm looking, i.e. the new element appears in the field of textInput CB and when clicking on the button added to the data provider while does not disappear from the textInput. Is there a way to accomplish this same behavior in the change event handler?

    Thank you!

    f

    Try callLater to postpone adding the item.

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