Detailed introduction to the application of XML in FLASH

Click here to browse the Flash Tutorial column Regarding the application of XML in FLASH, I have written several articles before. I also collected several articles from the Internet. However, they are all very simple and commonly used ones. Here, I summarize other related explanations of XML. If there are any shortcomings, I hope everyone can complement each other. Just for a common purpose: to improve together. 1. Requirements for writing standard XML Click here to browse the Flash Tutorial column Regarding the application of XML in FLASH, I have written several articles before. I also collected several articles from the Internet. However, they are all very simple and commonly used ones. Here, I summarize other related explanations of XML. If there are any shortcomings, I hope everyone can complement each other. Just for a common purpose: to improve together.
1. When writing standard XML, you need to pay attention to the following points:

1. list

2. - paddingleft-2">

3. A standard XML document must start with "" on the first line and end with "/>" , the beginning of which needs to declare the XML version, such as: version="1.0", and should also include a statement about encoding: "encoding="utf-8""; XML requires that all tags must be closed before the end of the document. If the tag contains content, it must be written in the format of "contentname>". If the content is empty, it should be written in The format of name>; that is, it must be followed by . Every XML has a root element, also called the root node. Nodes have node values ​​and attributes. If the XML node value contains the same characters as XML tag keywords, XML will not be able to parse the document. For example, if a node value is a greater than or less than sign, the interpreter will generate an error.

2. Create a simple instance in FLASH:

//创建一个新的XML类实例
var my_XML:XML=new XML();
//创建一个TextArea组件，用于显示此XML内容
var my_TextArea:mx.controls.TextArea;
//加载外部XML文件
my_XML.load("my_xml.xml");
//为load函数定义onLoad函数---此处是必须的。只有当加载成功后，才能控制XML。否则不能。
my_XML.onLoad=function(ok:Boolean){
if(ok){
my_TextArea.text =this;
}else{
my_TextArea.text ="加载失败..."
}
}
//忽略空白：
my_XML.ignoreWhite=true;

3. Detailed explanation on FLASH parsing XML, To put it bluntly, it is the reading of nodes.
First of all, let’s take a look at this picture and add a little impression.

Below, I will give a detailed introduction to the parsing of XML files.
For the convenience of explanation, here I give a simple example.

1、新建一个记事本文件，在里面输入如下内容：
<购买物品>
<衬衣 颜色="白色" 品牌="雅戈尔">1件</衬衣>
<裤子 颜色="深蓝" 品牌="王子裤">2件</裤子>
<鞋子 颜色="黑色" 品牌="红蜻蜓">3双</鞋子>
<总花费金额>
<打的费>50元</打的费>
<货物金>1000元</货物金>
</总花费金额>
</购买物品>
然后保存为"goods.xml"，注意，在编码处，要选择"Unicode"。
2、下面，就对里面的各项值进行解读。
读取整个XML文件的方法：
在刚才的XML的同级目录下新建一FLA文件，然后在场景中放置一TextArea组件。并赋实例名“my_TextArea”，
然后在第一帧中添加如下代码：
var my_XML:XML=new XML();
System.useCodepage=true;
var my_TextArea:mx.controls.TextArea;
my_XML.load("goods.xml")
my_XML.onLoad=function(ok:Boolean){
if(ok){
my_TextArea.text =this;
}else{
my_TextArea.text ="加载失败"
}
}
按CTRL ENTER测试，即可以看效果。
首先,我们来看看如何对XML中的节点名称或者节点属性进行读取呢?
比如,我们要读取如例子中的"购买物品"这几个字符,该如何操作呢?
我们使用如下语句：
this.firstChild.nodeName;
如果要读取"衬衣"：
this.firstChild.childNodes[0].nodeName;
如果要读取"1条"：
this.firstChild.childNodes[1].childNodes[0].nodeValue;
如果要读取裤子的品牌：
this.firstChild.childNodes[1].attributes.品牌;
将XML读取进LIST组件中：
System.useCodepage = true;
var my_TextArea:mx.controls.TextArea;
var my_List:mx.controls.List;
var my_XML:XML = new XML();
my_XML.ignoreWhite = true;
my_XML.load("shopping.xml");
my_XML.onLoad = function(ok:Boolean) {
 if (ok) {
 var childnodes = this.firstChild.childNodes;
 for (i=0; i<childnodes.length; i  ) {
 my_List.addItem({label:childnodes.nodeName});
 }
 } else {
 my_TextArea.text  = "加载失败";
 }
};
第一个节点：firstChild:
用法：this.firstChild;
最后一个节点：lastChild
用法：this.firstChild;
兄弟节点：nextSibling:
用法：this.firstChild.childNodes[0].nextSibling;
另一个兄弟节点：previousSibling:
用法：this.firstChild.childNodes[0].previousSibling;
区别：nextSibling是朝后,而previousSibling是当前之前;
父类节点：parentNode:
用法:this.firstChild.parentNode;

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