Flex - 如果打开警报对话框,下拉列表会停止

时间:2013-05-11 15:41:47

标签: actionscript-3 flex flash-builder

我需要在用户在下拉列表中选择某个选项后显示警告对话框。

这是flex(flash builder 4.6)中的一个简单下拉列表,它打开一个警告对话框。当我这样做时,下拉列表被“卡住”,这意味着在选择选项后,通常下拉列表会关闭,但是当我显示警报时,它会保持打开状态,您必须再次单击选项关闭它。

下拉列表mxml:

       <s:DropDownList id="typeEventDropDownList"
                        change="typeEventDropDownList_changeHandler(event)"
                        selectedIndex="0">
            <s:layout>
                <s:VerticalLayout requestedRowCount="10"/>
            </s:layout>
            <s:dataProvider>
                <s:ArrayList source="[ChooseAction,a,b,c,d,e,f,g,h,i]" />
            </s:dataProvider>
        </s:DropDownList>

下拉列表处理程序:

protected function typeEventDropDownList_changeHandler(event:IndexChangeEvent):void
            {
                     // if this alert is called, the drop down list 'sticks' open.   if the alert is removed, it closes normally
            Alert.show("bla bla bla", "Warning",mx.controls.Alert.OK , this, null);  // does not matter if a method is called from here
                        }

我已经在警告对话框之前和之后尝试了一些使用closeDropDown(甚至调用OpenDropDown)的组合,这似乎没什么区别:

         typeEventDropDownList.openDropDown();  //have tried opening and closing, closing only, before and after alert - no difference
         typeEventDropDownList.closeDropDown(true);  // have tried true and false  no difference

2 个答案:

答案 0 :(得分:1)

您可以使用

protected function typeEventDropDownList_changeHandler(event:IndexChangeEvent):void
{
callLater(DisplayAlert); 
}

protected function DisplayAlert()
{
//Display your alert here , i.e., Alert.show()
}

这对我有用。

答案 1 :(得分:0)

你把关闭列表代码放在哪里?这应该有效:

protected function typeEventDropDownList_changeHandler(event:IndexChangeEvent):void
{
    typeEventDropDownList.closeDropDown(true);
    Alert.show("bla bla bla", "Warning",mx.controls.Alert.OK , this, null);
}