Flex Examples » selectionChanging http://blog.flexexamples.com Just a bunch of Adobe Flex Examples Wed, 26 Jan 2011 18:09:51 +0000 en hourly 1 Preventing specific item selection on a Spark DropDownList control in Flex 4 http://blog.flexexamples.com/2009/04/11/preventing-specific-item-selection-on-a-spark-dropdownlist-control-in-flex-gumbo/ http://blog.flexexamples.com/2009/04/11/preventing-specific-item-selection-on-a-spark-dropdownlist-control-in-flex-gumbo/#comments Sun, 12 Apr 2009 06:59:37 +0000 Peter deHaan http://blog.flexexamples.com/2009/04/11/preventing-specific-item-selection-on-a-spark-dropdownlist-control-in-flex-gumbo/ The following example shows how you can prevent selection of specific items in a Spark DropDownList control in Flex 4 by listening for the changing event and calling the preventDefault() method.

<?xml version="1.0" encoding="utf-8"?> <!-- http://blog.flexexamples.com/2009/04/11/preventing-specific-item-selection-on-a-spark-dropdownlist-control-in-flex-gumbo/ --> <s:Application name="Spark_DropDownList_selectionChanging_test" xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark" xmlns="library://ns.adobe.com/flex/mx">   <fx:Script> <![CDATA[ import mx.controls.Alert; import spark.events.IndexChangeEvent;   protected function dropDownList_changingHandler(evt:IndexChangeEvent):void { [...]]]> The following example shows how you can prevent selection of specific items in a Spark DropDownList control in Flex 4 by listening for the changing event and calling the preventDefault() method.

The following example(s) require Flash Player 10 and the Adobe Flex 4 SDK. To download the Adobe Flash Builder 4 trial, see http://www.adobe.com/products/flex/. To download the latest nightly build of the Flex 4 SDK, see http://opensource.adobe.com/wiki/display/flexsdk/Download+Flex+4.
For more information on getting started with Flex 4 and Flash Builder 4, see the official Adobe Flex Team blog.

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2009/04/11/preventing-specific-item-selection-on-a-spark-dropdownlist-control-in-flex-gumbo/ -->
<s:Application name="Spark_DropDownList_selectionChanging_test"
        xmlns:fx="http://ns.adobe.com/mxml/2009"
        xmlns:s="library://ns.adobe.com/flex/spark"
        xmlns="library://ns.adobe.com/flex/mx">
 
    <fx:Script>
        <![CDATA[
            import mx.controls.Alert;
            import spark.events.IndexChangeEvent;
 
            protected function dropDownList_changingHandler(evt:IndexChangeEvent):void {
                var ddl:DropDownList = evt.currentTarget as DropDownList;
                if ((ddl.selectedItem != null) && (ddl.selectedItem.hasOwnProperty("selectable")) && (!ddl.selectedItem.selectable)) {
                    evt.stopImmediatePropagation();
                    evt.preventDefault();
                }
            }
 
            protected function dropDownList_changeHandler(evt:IndexChangeEvent):void {
                Alert.show("Spark DropDownList selection was changed.");
            }
        ]]>
    </fx:Script>
 
    <s:DropDownList id="dropDownList"
            labelField="label"
            prompt="Please select a string..."
            changing="dropDownList_changingHandler(event);"
            change="dropDownList_changeHandler(event);"
            width="200"
            horizontalCenter="0"
            top="10">
        <s:dataProvider>
            <s:ArrayList>
                <fx:Object label="The" selectable="false" />
                <fx:Object label="  Quick" />
                <fx:Object label="  Brown" />
                <fx:Object label="  Fox" />
                <fx:Object label="  Jumps" />
                <fx:Object label="  Over" />
                <fx:Object label="The" selectable="false" />
                <fx:Object label="  Lazy" />
                <fx:Object label="  Dog" />
            </s:ArrayList>
        </s:dataProvider>
    </s:DropDownList>
 
</s:Application>

View source is enabled in the following example.

This entry is based on a beta version of the Flex 4 SDK and therefore is very likely to change as development of the Flex SDK continues. The API can (and will) change causing examples to possibly not compile in newer versions of the Flex 4 SDK.

 
]]> http://blog.flexexamples.com/2009/04/11/preventing-specific-item-selection-on-a-spark-dropdownlist-control-in-flex-gumbo/feed/ 0 Determining when the selected item changes on the FxButtonBar control in Flex Gumbo http://blog.flexexamples.com/2009/02/10/determining-when-the-selected-item-changes-on-the-fxbuttonbar-control-in-flex-gumbo/ http://blog.flexexamples.com/2009/02/10/determining-when-the-selected-item-changes-on-the-fxbuttonbar-control-in-flex-gumbo/#comments Wed, 11 Feb 2009 07:57:19 +0000 Peter deHaan http://blog.flexexamples.com/2009/02/10/determining-when-the-selected-item-changes-on-the-fxbuttonbar-control-in-flex-gumbo/ The following example shows how you can determine when the selected item changes on the Flex Gumbo FxButtonBar control by listening for the selectionChanging or selectionChanged events.

Full code after the jump.

To use the following code, you must have Flash Player 10 and a Flex Gumbo SDK installed in your Flex Builder [...]]]> The following example shows how you can determine when the selected item changes on the Flex Gumbo FxButtonBar control by listening for the selectionChanging or selectionChanged events.

Full code after the jump.

To use the following code, you must have Flash Player 10 and a Flex Gumbo SDK installed in your Flex Builder 3. For more information on downloading and installing the Gumbo SDK into Flex Builder 3, see “Using the beta Gumbo SDK in Flex Builder 3″.

View MXML

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2009/02/10/determining-when-the-selected-item-changes-on-the-fxbuttonbar-control-in-flex-gumbo/ -->
<Application name="FxButtonBar_selectionChanged_test"
        xmlns="http://ns.adobe.com/mxml/2009"
        layout="vertical"
        verticalAlign="middle"
        backgroundColor="white">

    <Script>
        <![CDATA[
            import mx.events.IndexChangedEvent;

            private function btn_selectionChanging(evt:IndexChangedEvent):void {
                arrColl.addItem(evt);
            }

            private function btn_selectionChanged(evt:IndexChangedEvent):void {
                arrColl.addItem(evt);
            }
        ]]>
    </Script>

    <Declarations>
        <ArrayCollection id="arrColl" />
    </Declarations>

    <ApplicationControlBar dock="true">
        <Form styleName="plain">
            <FormItem label="requiresSelection:">
                <FxCheckBox id="checkBox" />
            </FormItem>
            <FormItem>
                <FxButtonBar id="btnBar"
                        requiresSelection="{checkBox.selected}"
                        selectionChanging="btn_selectionChanging(event);"
                        selectionChanged="btn_selectionChanged(event);">
                    <dataProvider>
                        <ArrayCollection source="[One,Two,Three,Four,Five]" />
                    </dataProvider>
                </FxButtonBar>
            </FormItem>
        </Form>
    </ApplicationControlBar>

    <DataGrid id="dataGrid"
            dataProvider="{arrColl}"
            width="100%">
        <columns>
            <DataGridColumn dataField="type" />
            <DataGridColumn dataField="oldIndex" />
            <DataGridColumn dataField="newIndex" />
        </columns>
    </DataGrid>

</Application>

This entry is based on a beta version of the Flex Gumbo SDK and therefore is very likely to change as development of the Flex SDK continues. The API can (and will) change causing examples to possibly not compile in newer versions of the Flex Gumbo SDK.

 
]]> http://blog.flexexamples.com/2009/02/10/determining-when-the-selected-item-changes-on-the-fxbuttonbar-control-in-flex-gumbo/feed/ 1