Extjs 数据读取对象ArrayReader/JsonReader/XmlRead -

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Extjs 数据读取对象ArrayReader/JsonReader/XmlRead

json EXT JavaScript XML XHTML

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>无标题页</title>
<script src="ExtJs/ext-base.js" type="text/javascript"></script>
<script src="ExtJs/ext-all.js" type="text/javascript"></script>
<script type="text/javascript">...
<!--
//数据源为数组的ArrayReader
function ArrayData()
...{
//定义数组
var arr=[ [ 'Bill', 'Gardener',1],['Ben', 'Horticulturalist',2]];
var reader = new Ext.data.ArrayReader(
//以第一个元素做为recordid,这个是必须得要的
...{id: 2},
//定义数组到record的映射关系
//name:属性名称
//mapping:映射到数据源的序列，即索引
[
...{name: 'name', mapping: 0},//对应字符:Bill
...{name: 'metier', mapping: 1},//对应字符:Gardener
...{name: 'id',mapping:2}//对应数字:1,如果第一个元素定义，则可以省略
]
);
//生成元数据
var data=reader.readRecords(arr);
var str="";
for(var i=0;i<data.records.length;i++)
...{
//标识列保存的数组被转换为对象 Json数据
str = str.concat(
" totalRecords:"+data.totalRecords +//数据总条数
" ID:"+data.records[i].id +
" Data: .id="+data.records[i].data.id +
" Data: .name="+data.records[i].data.name +
" Data: .metier="+data.records[i].data.metier +
" json:"+data.records[i].json+" ");
}
alert(str);
}
function JsonData()
...{
var json=...{ 'results': 2, //设定此对象的总个数,与rows数组长度一致，需要手动设定
'rows': [
...{ id: 1, name: 'Bill', metier: 'Gardener' },
...{ id: 2, name: 'Ben', metier: 'Horticulturalist' }
]
};
var reader=new Ext.data.JsonReader(
...{
totalProperty: "results",//totalRecords属性由json.results得到(省略此参数也能得到总条数)
root: "rows", //构造元数据的数组由json.rows得到
id: "id" //id由json.id得到
},[
...{name:'id',mapping:'id'},
...{name: 'name', mapping: 'name'},
...{name: 'metier'} //如果name与mapping同名,可以省略mapping
]
)
var data=reader.readRecords(json);
var str="";
for(var i=0;i<data.records.length;i++)
...{
//标识列保存的数组被转换为对象 Json数据
str = str.concat(
" totalRecords:"+data.totalRecords +//数据总条数
" ID:"+data.records[i].id +
" Data: .id="+data.records[i].data.id +
" Data: .name="+data.records[i].data.name +
" Data: .metier="+data.records[i].data.metier +
" json:"+data.records[i].json+" ");
}
alert(str);
}
function XmlData()
...{
var str=["<?xml version="1.0" encoding="utf-8" ?>",
"<dataset>",
"<results>2</results>",
"<row>",
"<id>1</id>",
"<name>Bill</name>",
"<occupation>Gardener</occupation>",
"</row>",
"<row>",
"<id>2</id>",
"<name>Ben</name>",
"<occupation>Horticulturalist</occupation>",
"</row>",
"</dataset>"].join("");
//生成xmldocument对象
var xmlDocument;
if(Ext.isIE)...{
xmlDocument = new ActiveXObject("Msxml2.FreeThreadedDOMDocument")
xmlDocument.async=false;
xmlDocument.resolveExternals = false;
xmlDocument.loadXML(str)
}
else...{
xmlDocument = (new DOMParser()).parseFromString(str, "text/xml");
}
//然后开始...和其它两个reader一样的用法,只是这儿换了一种写法,recordtype也可以是一个record对象
//record对象的属性映射
var record = Ext.data.Record.create([
...{name: 'name', mapping: 'name'}, // "mapping" property not needed if it's the same as "name"
...{name: 'metier',mapping:'occupation'}, // This field will use "occupation" as the mapping.
...{name:'id'}
])
var reader = new Ext.data.XmlReader(...{
totalRecords: "results",
record: "row", //row是节点选择器
id: "id"
}, record);
var data=reader.readRecords(xmlDocument);
var outstr="";
for(var i=0;i<data.records.length;i++)
...{
//标识列保存的数组被转换为对象 Json数据
outstr = outstr.concat(
" totalRecords:"+data.totalRecords +//数据总条数
" ID:"+data.records[i].id +
" Data: .id="+data.records[i].data.id +
" Data: .name="+data.records[i].data.name +
" Data: .metier="+data.records[i].data.metier +
" json:"+data.records[i].json+" ");
}
alert(outstr);
}
//-->
</script>
</head>
<body>
<input id="Button1" onclick="ArrayData()" type="button" value="数组源数据" />
<input id="Button2" onclick="JsonData()" type="button" value="Json源数据" />
<input id="Button3" onclick="XmlData()" type="button" value="XML源数据" />
</body>
</html>