Flex动态读取XML文件并显示在DataGrid中

<?xml version="1.0" encoding="utf-8"?>
<!-- 演示了Flex在编译阶段，利用mx:XML将XML数据读入，并且将其在DataGrid控件中显示-->

<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
        layout="vertical"
        verticalAlign="top"
        backgroundColor="white">   

    <mx:XML id="tempXML"
            source="assets/math.xml" />

    <mx:XMLListCollection id="mathXMLList"
            source="{tempXML.student}" />
    <mx:XMLListCollection id="familyMembersXMLList"
            source="{scoreDataGrid.selectedItem.familyMembers.familyMember}" />   

    <mx:Script>
        <![CDATA[
            private function getFamilyMembersCount(item:Object, column:DataGridColumn):String {
                return item.familyMembers.familyMember.length();
            }   

            private function numericSortCompareFunction(objA:Object, objB:Object):int {
                var itemA:Number = parseInt(objA.Time.text()) as Number;
                var itemB:Number = parseInt(objB.Time.text()) as Number; 

                if (itemA > itemB) {
                    return 1;
                } else if (itemA < itemB) {
                    return -1;
                } else {
                    return 0;
                }
            }
        ]]>
    </mx:Script>   

    <mx:VBox>
        <mx:DataGrid id="scoreDataGrid"
                dataProvider="{mathXMLList}"
                width="100%"
                rowCount="{mathXMLList.length + 1}">
            <mx:columns>
                <mx:DataGridColumn id="nameCol"
                        dataField="name"
                        headerText="姓名"/>
                <mx:DataGridColumn id="sexCol"
                        dataField="sex"
                        headerText="性别" />
                <mx:DataGridColumn id="scoreCol"
                        dataField="score"
                        headerText="成绩"
                        sortCompareFunction="numericSortCompareFunction"  />
                <mx:DataGridColumn id="familyMembers"
                        dataField="familyMembers"
                        headerText="家庭成员个数"
                        labelFunction="getFamilyMembersCount" />
            </mx:columns>
        </mx:DataGrid>

        <mx:DataGrid id="familyMembersDataGrid"
                dataProvider="{familyMembersXMLList}"
                width="100%"
                visible="{familyMembersXMLList.length > 0}"
                rowCount="{familyMembersXMLList.length + 1}">
            <mx:columns>
                <mx:DataGridColumn id="familyMemberNameCol"
                        dataField="name"
                        headerText="姓名" />
                <mx:DataGridColumn id="familyMemberRelationshipCol"
                        dataField="relationship"
                        headerText="关系" />
            </mx:columns>
        </mx:DataGrid>
    </mx:VBox>

</mx:Application>

xml文件如下：

<?xml version="1.0" encoding="UTF-8" standalone="no" ?>
<Math>   

    <student>
        <name>lzx</name>
        <sex>male</sex>
        <score>85</score>
        <familyMembers>
            <familyMember>
                <name>lyj</name>
                <relationship>father</relationship>
            </familyMember>
        </familyMembers>
    </student>   

    <student>
        <name>zj</name>
        <sex>female</sex>
        <score>87</score>
        <familyMembers>
            <familyMember>
                <name>zjfather</name>
                <relationship>father</relationship>
            </familyMember>
        </familyMembers>
    </student>  

    <student>
        <name>cb</name>
        <sex>male</sex>
        <score>74</score>
    </student>    
    
</Math>