Motivation:
Now let's do a small example of applying XML in IE: solving the linkage problem of double drop-down menus. Perhaps the most common example is to select a province and then change the city options, so let's try to use XML to complete it.
I have implemented some of the functions introduced before directly using XML+XSL files. You may not be very familiar with its usage, so I will use HMTL+XML this time, hoping to make everyone more familiar with it. Clear understanding - "XML can be so simple!":)
Materials:
XML Volume Select Menu Linkage
There are 2 files: Citys.xml and CitySelect.htm
Function:
After selecting a province, the corresponding city can be automatically displayed, which is convenient for users, effectively improves data interaction, and makes your page more colorful.
Effect:
Browse here
Code:
Citys.xml <?xml version="1.0" encoding="gb2312"?> <China> <State id="1" name="江西"> <City>九江</City> <City>南昌</City> <City>庐山</City> <City>景德镇</City> </State> <State id="2" name="北京"> <City>北京西</City> <City>居庸关</City> <City>清华园</City> <City>周口店</City> </State> <State id="3" name="福建"> <City>福州</City> <City>厦门</City> <City>漳州</City> </State> <State id="4" name="甘肃"> <City>兰州</City> <City>洛门</City> <City>嘉峪关</City> </State> <State id="5" name="广东"> <City>广州</City> <City>深圳</City> <City>东莞</City> <City>石牌</City> </State> <State id="6" name="安徽"> <City>合肥</City> <City>黄山</City> <City>九龙岗</City> <City>马鞍山</City> </State> </China>
CitySelect.htm
Custom function: ChooseState
(Read the province in XML data name and added to SelState's drop-down list)
function ChooseState() { var source; var sourceName = "Citys.xml"; var source = new ActiveXObject('Microsoft.XMLDOM'); //创建一个 MSXML解析器实例 source.async = false; source.load(sourceName); //装入XML文档 root = source.documentElement; //设置文档元素为根节点元素 sortField=root.selectNodes("//@name"); //搜索属性中含有name的所有节点 for(var i=0;i<sortField.length;++i) //增加省份名称到下拉列表 { var oOption = document.createElement('OPTION'); oOption.text = " "+sortField[i].text+" "; oOption.value = sortField[i].text; form1.SelState.options.add(oOption); } ChooseCity(); }
Custom function: ChooseCity
(Read the corresponding city in the XML data based on the currently selected province name name and added to SelCity's drop-down list)
function ChooseCity() { x=form1.SelState.selectedIndex; //读取省份下拉框的当前选项 y=form1.SelState.options[x].value; sortField=root.selectNodes("//State[@name='"+y+"']/City&q uot;); //搜索name属性值等于 参数y的State节点下的所有city节点 for(var i=form1.SelCity.options.length-1;i>=0;--i) //撤消原来的列表项 { form1.SelCity.options.remove(i) } for(var i=0;i<sortField.length;++i) //增加城市名称到下拉列表 { var oOption = document.createElement('OPTION'); oOption.text = " "+sortField[i].text+" "; oOption.value = sortField[i].text; form1.SelCity.options.add(oOption); } }
Form source code
<BODY onLoad="ChooseState()"> <FORM action="" method="post" id="form1" name="form1"> <SELECT name="SelState" id="SelState" onchange="ChooseCity()" > </SELECT> <SELECT name="SelCity" id="SelCity" > </SELECT> </FORM> </BODY>
Postscript:
Just started learning When it comes to XML, I also have the same confusion as everyone else - "I have learned XML, but how should I use this XML?" This problem has hindered me for a long, long time...
Because e-commerce and software development are my expertise, I thought it would be better to start with what I am most familiar with. So I implemented some of the most commonly used functions in website construction in XML. You can do it too!
The above is the practical tips for XML volume (4): menu linkage content. For more related content, please pay attention to the PHP Chinese website (m.sbmmt.com)!