Flex：在ComboBox中编程设置选择的项目 [英] Flex: Programatically Setting the Chosen Item in a ComboBox

问题描述

我需要一些帮助，在组合框中以编程方式设置所选项。

I need some help programatically setting the selected item in a combobox.

我有一个这样的组合框：

I've got a combobox like this:

<mx:ComboBox  id="MyComboBox" change="puzzleHandler(event);"   prompt="Make a Selection">
    <mx:ArrayCollection id="myDP">
        <mx:Object  id="first" label="Label 1" series="2"  pageTitle="Title 1"/>
        <mx:Object  id="second" label="Label 2" series="7" pageTitle="Title 2"/>                                        
        <mx:Object  id="third" label="Label 3" series="9"  pageTitle="Title 3"/>                                        
    </mx:ArrayCollection>
</mx:ComboBox>

我有一个关于深层链接的函数。如果有人放入网址：www.mysite.com/#view=2，他们将被带到网站的适当部分（没有在组合框中选择标签2）。我如何以编程方式设置comboBox，以便它对应于它正在查看的用户？

I've got a function that regards deep linking. If someone puts in the url: www.mysite.com/#view=2 they'll be taken to the appropriate part of the site (without having selected Label 2 in the comboBox). How do I set the comboBox programatically, so that it corresponds with what the user it looking at?

在我的函数的switch语句中，我想设置comboBox为标签对应于视图。如果view = 2，那么组合框应该显示Label 2。

In my function's switch statement, I want to set the comboBox to the label that corresponds with the view. If "view=2" then the comboBox should show "Label 2" as selected.

    case "view=1":
        MyComboBox.selectedItem.label="Label 1";
        parseUrl();

    case "view=2":
        MyComboBox.selectedItem.label="Label 2";
        parseUrl();

    case "view=3":
        MyComboBox.selectedItem.label="Label 3";
        parseUrl();

我试过这样：MyComboBox.selectedItem.label =Label 1但它不工作。有什么建议么？

I tried this: MyComboBox.selectedItem.label="Label 1" But it's not working. Any suggestions?

谢谢。

-Laxmidi

推荐答案

您不想更改selectedItem的对象;您要更改selectedItem或selectedIndex。尝试此操作：

You don't want to change the selectedItem's object; you want to change the selectedItem or the selectedIndex. Try this:

case "view=1":
    MyComboBox.selectedIndex=0;
    parseUrl();

case "view=2":
    MyComboBox.selectedIndex=1;
    parseUrl();

case "view=3":
    MyComboBox.selectedIndex=2;
    parseUrl();

如果你想设置selectedItem而不是selectedIndex，你必须循环遍历dataProvider才能找到实际项目基于case / URL值。类似这样：

IF you want to set the selectedItem instead of the selectedIndex you'll have to loop over dataProvider to find the actual item based on the case / URL value. Something like this:

for each(var tempObject : Object in myList.dataProvider){
  if(tempObject.label == urlValue){
    MyComboBox.selectedItem = tempObject;
    break;
 }
}

第二种方法是更灵活的长期。

The second approach is more flexible long term.

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