动态创建 DataGrid 列

最新推荐文章于 2022-08-11 17:39:39 发布

最新推荐文章于 2022-08-11 17:39:39 发布 · 125 阅读

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#Nokia #XML #Mobile #UP #Flash

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本文介绍了一种使用Flex的DataGrid组件动态构建表格列的方法。通过分析XML数据源中产品的属性来定义DataGrid的列属性，如宽度、是否可编辑等，并展示了如何根据不同字段设置特定的显示样式。

<?xml version="1.0" encoding="utf-8"?>

<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="vertical"

creationComplete="initApp()">

<mx:Script><![CDATA[

import mx.controls.dataGridClasses.DataGridColumn;

import mx.controls.DataGrid;

import mx.collections.XMLListCollection;

import mx.controls.Alert;

[Bindable]

private var _xlcCatalog:XMLListCollection; //the dataProvider for the DG

//run by creationComplete

public function initApp():void

{

_xlcCatalog = new XMLListCollection(xmlCatalog.product); //wrap the XML product nodes in an XMLListCollection

buildDG(); //creates the dataGrid

}//initApp

private function buildDG():void

{

var aColumnDef:Array = getColumnDefArray(); //returns a noraml array of objects that specify DtaGridColumn properties

var oColumnDef:Object;

var dg:DataGrid = new DataGrid; //instantiate a new DataGrid

var dgc:DataGridColumn;

var aColumnsNew:Array = dg.columns

var iTotalDGWidth:int = 0;

for (var i:int=0;i<aColumnDef.length;i++) { //loop over the column definition array

oColumnDef = aColumnDef[i];

dgc = new DataGridColumn(); //instantiate a new DataGridColumn

dgc.dataField = oColumnDef.dataField; //start setting the properties from the column def array

dgc.width = oColumnDef.width;

iTotalDGWidth += dgc.width; //add up the column widths

dgc.editable = oColumnDef.editable;

dgc.sortable = oColumnDef.sortable

dgc.visible = oColumnDef.visible;

dgc.wordWrap = oColumnDef.wordWrap;

aColumnsNew.push(dgc) //push the new dataGridColumn onto the array

}

dg.columns = aColumnsNew; //assign the array back to the dtaGrid

dg.editable = true;

dg.width = iTotalDGWidth;

dg.dataProvider = _xlcCatalog; //set the dataProvider

this.addChild(dg); //add the dataGrid to the application

}//buildDG

//uses the first product node to define the columns

private function getColumnDefArray():Array

{

//Alert.show("colcount:" + xmlCatalog.toXMLString());

var aColumns:Array = new Array();

var node0:XML = xmlCatalog.product[0]; //get the first "product" node

var xlColumns:XMLList = node0.children(); //get its child nodes (columns) as an XMLList

var xmlColumn:XML

var oColumnDef:Object;

for (var i:int=0;i<xlColumns.length();i++) { //loop over the xmlList

xmlColumn = xlColumns[i];

oColumnDef = new Object();

oColumnDef.dataField = xmlColumn.localName(); //make the dataField be the node name

switch (oColumnDef.dataField) { //conditional column property logic

case "name":

oColumnDef.width = 80;

oColumnDef.sortable = false;

oColumnDef.visible = true;

oColumnDef.editable = false;

oColumnDef.wordWrap = false;

break;

case "description":

oColumnDef.width = 200;

oColumnDef.sortable = false;

oColumnDef.visible = true;

oColumnDef.editable = false;

oColumnDef.wordWrap = true;

break;

case "price":

oColumnDef.width = 40;

oColumnDef.sortable = true;

oColumnDef.visible = true;

oColumnDef.editable = true;

oColumnDef.wordWrap = false;

break;

case "image":

oColumnDef.width = 100;

oColumnDef.sortable = false;

oColumnDef.visible = false;

oColumnDef.editable = false;

oColumnDef.wordWrap = false;

break;

default:

oColumnDef.width = 50;

oColumnDef.sortable = true;

oColumnDef.visible = true;

oColumnDef.editable = false;

oColumnDef.wordWrap = false;

break;

}

aColumns.push(oColumnDef);

}

return aColumns; //return the array

}//getColumnDefArray

]]></mx:Script>

<mx:XML id="xmlCatalog">

<name>Nokia 6010</name>

<description>Easy to use without sacrificing style, the Nokia 6010 phone offers functional voice communication supported by text messaging, multimedia messaging, mobile internet, games and more</description>

<image>assets/pic/Nokia_6010.gif</image>

<triband>false</triband>

<camera>false</camera>

<video>false</video>

<highlight2>Large color display</highlight2>

</product>

<name>Nokia 3100 Blue</name>

<description>Light up the night with a glow-in-the-dark cover - when it's charged with light you can easily find your phone in the dark. When you get a call, the Nokia 3100 phone flashes in tune with your ringing tone. And when you snap on a Nokia Xpress-on™ gaming cover*, you'll get luminescent light effects in time to the gaming action.</description>

<image>assets/pic/Nokia_3100_blue.gif</image>

<camera>false</camera>

<video>false</video>

<highlight2>Flashing lights</highlight2>

</product>

<name>Nokia 3100 Pink</name>

<image>assets/pic/Nokia_3100_pink.gif</image>

<camera>false</camera>

<video>false</video>

<highlight2>Flashing lights</highlight2>

</product>

<name>Nokia 3120</name>

<description>Designed for both business and pleasure, the elegant Nokia 3120 phone offers a pleasing mix of features. Enclosed within its chic, compact body, you will discover the benefits of tri-band compatibility, a color screen, MMS, XHTML browsing, cheerful screensavers, and much more.</description>

<image>assets/pic/Nokia_3120.gif</image>

<camera>false</camera>

<video>false</video>

<highlight1>Multimedia messaging</highlight1>

<highlight2>Animated screensavers</highlight2>

</product>

<name>Nokia 3220</name>

<description>The Nokia 3220 phone is a fresh new cut on some familiar ideas - animate your MMS messages with cute characters, see the music with lights that flash in time with your ringing tone, download wallpapers and screensavers with matching color schemes for the interface.</description>