Flex:以编程方式设置组合框中的所选项目 [英] Flex: Programatically Setting the Chosen Item in a ComboBox

问题描述

我需要一些帮助，以编程方式设置组合框中的所选项目.

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>

我有一个关于深度链接的函数.如果有人输入网址:www.mysite.com/#view=2，他们将被带到网站的适当部分(无需在组合框中选择标签 2).如何以编程方式设置组合框，使其与用户查看的内容相对应?

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?

在我函数的 switch 语句中，我想将组合框设置为与视图对应的标签.如果view=2"，则组合框应显示标签 2"为选中状态.

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();

我试过这个: MyComboBox.selectedItem.label="Label 1" 但它不起作用.有什么建议?

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

谢谢.

-Lax​​midi

推荐答案

你不想改变 selectedItem 的对象；您想更改 selectedItem 或 selectedIndex.试试这个:

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();

如果您想设置 selectedItem 而不是 selectedIndex，您必须遍历 dataProvider 以根据大小写/URL 值查找实际项目.像这样:

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;
 }
}

从长远来看，第二种方法更加灵活.

The second approach is more flexible long term.

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