我正在使用如下的JSON数据。
{
"divisions": [{
"name": "division1",
"id": "div1",
"subdivisions": [{
"name": "Sub1Div1",
"id": "div1sub1",
"schemes": [{
"name": "Scheme1",
"id": "scheme1"
}, {
"name": "Scheme2",
"id": "scheme2"
}]
}, {
"name": "Sub2Div1",
"id": "div1sub2",
"schemes": [{
"name": "Scheme3",
"id": "scheme3"
}]
}
]
}]
}
我想将其读入TreeStore,但无法将子字段(divisions
,subdivisions
,schemes
)更改为相同(例如children
)。
如何实现这个目标?
答案 0 :(得分:7)
当嵌套的JSON加载到TreeStore中时,基本上通过TreeStore.fillNode()
方法和NodeInterface.appendChild()
之间的递归调用加载子节点。
每个节点的子字段的实际检索在此行的TreeStore.onNodeAdded()
内完成:
dataRoot = reader.getRoot(data);
阅读器的getRoot()
是在阅读器的buildExtractors()
方法中动态创建的,为了处理嵌套JSON中不同的子字段,您需要覆盖该方法。以下是它的完成方式:
Ext.define('MyVariJsonReader', {
extend: 'Ext.data.reader.Json',
alias : 'reader.varijson',
buildExtractors : function()
{
var me = this;
me.callParent(arguments);
me.getRoot = function ( aObj ) {
// Special cases
switch( aObj.name )
{
case 'Bill': return aObj[ 'children' ];
case 'Norman': return aObj[ 'sons' ];
}
// Default root is `people`
return aObj[ 'people' ];
};
}
});
这将能够解释这样的JSON:
{
"people":[
{
"name":"Bill",
"expanded":true,
"children":[
{
"name":"Kate",
"leaf":true
},
{
"name":"John",
"leaf":true
}
]
},
{
"name":"Norman",
"expanded":true,
"sons":[
{
"name":"Mike",
"leaf":true
},
{
"name":"Harry",
"leaf":true
}
]
}
]
}
有关完整的代码,请参阅this JsFiddle。