动态属性(嵌套)用作ExtJS中的网格列
我试图在我的原型mongoDB应用程序中使用动态属性方法.
基本上这种方法只是给你这样的东西:
{
SKU: "Y32944EW",
type: "shoes",
attr: [
{ "k": "manufacturer",
"v": "ShoesForAll",
},
{ "k": "color",
"v": "blue",
},
{ "k": "style",
"v": "comfort",
},
{ "k": "size",
"v": "7B"
}
]
}
(来源:http://askasya.com/post/dynamicattributes).
问题是,例如Kendo Grid不支持其数据源中的此类嵌套结构.
有谁知道Sencha ExtJS Grid Component是否可以做到这一点？
更新: SKU应该是一列,attr数组的每个v应该是一列.
更新:我试图在你的答案的帮助下设置一个sencha小提琴.
https://fiddle.sencha.com/#fiddle/evc
app.js(rev2)
// create the new type
Ext.data.Types.DYNAMIC = {
convert: function(value, record) {
for (var i = 0, ln = value.length; i < ln; i++) {
var item = value[i];
record.set(item.k, item.v);
}
return '';
},
type: 'dynamic',
sortType: Ext.data.SortTypes.none
};
// define a model
Ext.define('TestModel', {
extend: 'Ext.data.Model',
fields: [{name: "_id",type: "string"},
{name: "attr",type: Ext.data.Types.DYNAMIC}],
idProperty: '_id'
});
// create a store with the model assigned
Ext.create('Ext.data.Store', {
storeId: 'MyStore',
model: 'TestModel',
autoLoad: true,
proxy: {
type: 'ajax',
url: '/data.json',
reader: {
idProperty: '_id',
type: 'json',
root: 'data'
}
}
});
Ext.create('Ext.grid.Panel', {
title: 'Grid',
store: Ext.data.StoreManager.lookup('MyStore'),
columns: []
});
Ext.widget('window',{height: 200,width: 400, items: [grid ] }).show();
store.on('metachange', function(store, meta) {
grid.reconfigure(store, meta.columns);
});
data.json(rev2)
{
"metaData": {
"idProperty": "_id",
"rootProperty": "data",
"fields": [
{ "name": "_id","type": "string" },
{ "name": "de", "type":"string" },
{ "name": "en", "type":"string" },
{ "name": "fr", "type":"string" },
{ "name": "attr", "type": "dynamic"}
],
"columns": [
{
"header": "de",
"dataIndex": "de"
},
{
"header": "en",
"dataIndex": "en"
}
,
{
"header": "fr",
"dataIndex": "fr"
}
]
},
"data":
[
{"_id": "MyTextId1",
"attr":[
{
"k": "de",
"v": "GermanText Sample"
},
{
"k": "en",
"v": "English Text Sample"
},
{
"k": "fr",
"v": "French Text Sample"
},
]
},
{"_id": "MyTextId2",
"attr":[
{
"k": "de",
"v": "GermanText Sample 1"
},
{
"k": "en",
"v": "English Text Sample 1"
},
{
"k": "fr",
"v": "French Text Sample1 1"
},
]
}
]
}
错误信息:
Uncaught Error: [Ext.createByAlias] Unrecognized alias: data.field.[object Object]
更新: 使用sra的最后一次编辑中发布的片段.谢谢!
是的你可以.其中大部分已经是Build in.让我们从基础开始
除记录数据外,服务器还可以在其响应中返回元数据,这些元数据描述数据集本身的属性或用于重新配置Reader.要在响应中传递元数据,只需将metaData属性添加到响应数据的根目录即可.metaData属性可以包含任何内容,但支持一组特定的属性,如果它们存在,则由Reader处理:
root: the property name of the root response node containing the record data
totalProperty: property name for the total number of records in the data
successProperty: property name for the success status of the response
messageProperty: property name for an optional response message
fields: Config used to reconfigure the Model's fields before converting the response data into records
包含所有这些属性的初始Reader配置可能如下所示("fields"将包含在Model定义中,未显示):
reader: {
type : 'json',
root : 'root',
totalProperty : 'total',
successProperty: 'success',
messageProperty: 'message'
}
如果要传递包含与上面最初定义的属性不同的属性的响应对象,则可以使用metaData属性动态重新配置Reader.例如:
{
"count": 1,
"ok": true,
"msg": "Users found",
"users": [{
"userId": 123,
"name": "Ed Spencer",
"email": "ed@sencha.com"
}],
"metaData": {
"root": "users",
"totalProperty": 'count',
"successProperty": 'ok',
"messageProperty": 'msg'
}
}
您还可以将所需的任何其他任意数据放入metaData属性中,这将被Reader忽略,但可以通过Reader的metaData属性访问(也可以通过Proxy的metachange事件传递给侦听器(也由商店中继)然后,应用程序代码可以以它选择的任何方式处理传递的元数据.
如何使用它的一个简单示例是自定义绑定到网格的模型的字段.通过传递fields属性,Reader将在内部自动更新Model,但除非您还更新列配置,否则该更改不会自动反映在网格中.您可以手动执行此操作,也可以将标准网格列配置对象作为metaData属性的一部分传递,然后将其传递给网格.这是一个非常简单的例子,说明如何实现:
// response format:
{
...
"metaData": {
"fields": [
{ "name": "userId", "type": "int" },
{ "name": "name", "type": "string" },
{ "name": "birthday", "type": "date", "dateFormat": "Y-j-m" }
],
"columns": [
{ "text": "User ID", "dataIndex": "userId", "width": 40 },
{ "text": "User Name", "dataIndex": "name", "flex": 1 },
{ "text": "Birthday", "dataIndex": "birthday", "flex": 1, "format": 'Y-j-m', "xtype": "datecolumn" }
]
}
}
Reader将自动读取元字段配置并根据新字段重建模型,但是为了处理新的列配置,您需要处理应用程序代码中的元数据.这可以通过在商店或代理上处理metachange事件来完成,例如:
var store = Ext.create('Ext.data.Store', {
...
listeners: {
'metachange': function(store, meta) {
myGrid.reconfigure(store, meta.columns);
}
}
});
那是基础知识.现在您的数据结构的详细信息:
首先,我们需要一个转换器函数来读取自定义数据
convert: function(value,record) {
for(var i=0,ln=value.length;i<ln;i++) {
var item = value[i];
record.set(item.k,item.v);
}
return ''; let's save memory an drop it
}
我们可以发布基本字段(和列(未显示)) - 但我们不需要因为metachange可以处理所有
{ name: "SKU", type:"string") }, // don't forget to mark this as the idProperty in the reader and in the model
{ name: "type", type:"string") },
{ name: "attr", type:"auto", convert: convert() }
下面的所有字段和列都由服务器使用metachange发布
"metaData": {
"fields": [
{ name: "SKU", type:"string") },
{ name: "type", type:"string") },
{ name: "attr", type:"auto", convert: convert() },
// and the dynamic datafields
{ name: "manufacturer", type:"string" },
{ name: "style", type:"string" },
// ... and so on
],
"columns": [
{ "text": "ID", "dataIndex": "SKU", "width": 40 },
{ "text": "ID", "dataIndex": "SKU", "width": 40 },
// and the dynamic datacolumns
{ "text": "Manufacturer", "dataIndex": "manufacturer" },
{ "text": "Style", "dataIndex": "stlye" },
// ... and so on
]
}
编辑:
我建议您创建自己的阅读器,在将数据进一步处理之前将数据转换为规范化的JSON,或者您自己的Ext.data.Types类型.因为我认为它有点快,我建议您创建自己的数据类型.您的情况的缺点是,具有此属性的字段需要始终在动态字段之后,否则读取器将覆盖动态字段.
这是我用4.2.3测试过的剪辑
// create the new type
Ext.data.Types.DYNAMIC = {
convert: function(value, record) {
for (var i = 0, ln = value.length; i < ln; i++) {
var item = value[i];
record.data[item.k] = item.v;
}
return '';
},
type: 'dynamic',
sortType: Ext.data.SortTypes.none
};
// define a model
Ext.define('TestModel', {
extend: 'Ext.data.Model',
fields: [{name: "_id",type: "string"},
{name: "attr",type: "dynamic"}],
idProperty: '_id'
});
// create a store with the model assigned
Ext.create('Ext.data.Store', {
storeId: 'MyStore',
model: 'TestModel',
autoLoad: true,
proxy: {
type: 'ajax',
url: '/data.json',
reader: {
idProperty: '_id',
type: 'json',
root: 'data'
}
}
});
Ext.create('Ext.grid.Panel', {
title: 'Grid',
store: Ext.data.StoreManager.lookup('MyStore'),
columns: []
});
Ext.widget('window',{height: 200,width: 400, items: [grid ] }).show();
store.on('metachange', function(store, meta) {
grid.reconfigure(store, meta.columns);
});
和数据
{
"metaData": {
"idProperty": "_id",
"rootProperty": "data",
"fields": [
{ "name": "_id","type": "string" },
{ "name": "de", "type":"string" },
{ "name": "en", "type":"string" },
{ "name": "fr", "type":"string" },
{ "name": "attr", "type": "dynamic" }
],
"columns": [
{
"header": "de",
"dataIndex": "de"
},
{
"header": "en",
"dataIndex": "en"
}
,
{
"header": "fr",
"dataIndex": "fr"
}
]
},
"data":
[
{"_id": "MyTextId1",
"attr":[
{
"k": "de",
"v": "GermanText Sample"
},
{
"k": "en",
"v": "English Text Sample"
},
{
"k": "fr",
"v": "French Text Sample"
},
]
},
{"_id": "MyTextId2",
"attr":[
{
"k": "de",
"v": "GermanText Sample 1"
},
{
"k": "en",
"v": "English Text Sample 1"
},
{
"k": "fr",
"v": "French Text Sample1 1"
},
]
}
]
}
编辑:
这个剪辑在5.1中测试,它的工作原理
Ext.data.Types.DYNAMIC = {
convert: function(value, record) {
for (var i = 0, ln = value.length; i < ln; i++) {
var item = value[i];
record.data[item.k] = item.v;
}
return '';
},
type: 'dynamic',
sortType: Ext.data.SortTypes.none
};
Ext.define('Ext.data.field.Dynamic', {
extend: 'Ext.data.field.Field',
alias: 'data.field.dynamic',
sortType: 'none',
isDynamicField: true,
convert: function(value, record) {
for (var i = 0, ln = value.length; i < ln; i++) {
var item = value[i];
record.data[item.k] = item.v;
}
return '';
},
getType: function() {
return 'dynamic';
}
});
Ext.define('TestModel', {
extend: 'Ext.data.Model',
fields: [{name: "_id",type: "string"},{name: "attr",type: "dynamic"}],
idProperty: '_id'
});
var store = Ext.create('Ext.data.Store', {
storeId: 'MyStore',
model: 'TestModel',
autoLoad: true,
proxy: {
type: 'ajax',
url: '/qat/Content/TST/data.js',
reader: {
idProperty: '_id',
type: 'json',
rootProperty: 'data'
}
}
});
var grid = Ext.create('Ext.grid.Panel', {
title: 'Grid',
store: Ext.data.StoreManager.lookup('MyStore'),
dockedItems: [{xtype: 'pagingtoolbar',store: Ext.data.StoreManager.lookup('MyStore'), dock: 'bottom',displayInfo: false}],
columns: []
});
Ext.widget('window',{height: 200,width: 400, items: [grid ] }).show();
store.on('metachange', function(store, meta) {
// Apply the column definitions to the Grid
grid.reconfigure(store, meta.columns);
});