首先,我要求你对我宽容:我只是一个糟糕的ext-js和javascript新手...
我试图在ext-js中适应我的需求infinite scroll grid example。我在sencha ext-js中定义了以下商店:
Ext.define('AM.store.M2MResources', {
extend: 'Ext.data.Store',
requires: 'Ext.direct.*', // use ext-direct for binding
model: 'AM.model.M2MResource',
autoLoad: true,
paramsAsHash:false,
autoSave: false,
pageSize: 25,
// allow the grid to interact with the paging scroller by buffering
buffered: true,
proxy: {
type: 'direct',
api: {
// create : undefined,
read : M2MResourceServlet.getM2Mresources,
// update : undefined,
// destroy : undefined
},
extraParams: {
total: 100
},
root: 'data',
fields: [{name:'label'}, {name:'address_unique'}, {name:'address_network'}, {name:'status'}],
paramOrder: 'page, start, limit',
reader: {
type: 'json',
root: 'data',
successProperty: 'success',
totalProperty: 'totalCount'
},
writer: new Ext.data.JsonWriter({
encode: false,
writeAllFields: true,
listful: true
}
)
}
});
与这个directJNgine服务器对应:
public class M2MResourceServlet {
public static class ResourceData{
public String label;
public String address_unique;
public String address_network;
public String status;
}
public static class DirectStoreResult{
ResourceData[] data;
public int totalCount;
public boolean success = true;
public DirectStoreResult(ResourceData[] data, int totalCount) {
super();
this.data = data;
this.totalCount = totalCount;
}
}
static int counter = 0;
@DirectMethod
public DirectStoreResult getM2Mresources( Integer page, Integer start, Integer limit ) {
ArrayList<ResourceData> result = new ArrayList<ResourceData>();
// fill result list...
DirectStoreResult r = new DirectStoreResult(result.toArray(new ResourceData []{}),limit);
return r;
}
}
然后我指定了以下模型:
Ext.define('AM.model.M2MResource', {
extend: 'Ext.data.Model',
fields: [
{name:'label' },
{name:'address_unique' },
{name:'address_network' },
{name:'status' }
]
});
我希望将数据加载到以下网格中:
Ext.define('AM.view.resgrid.M2MResources', {
extend: 'Ext.grid.Panel',
alias: 'widget.m2mresources',
title: 'All Resources Here',
verticalScrollerType: 'paginggridscroller',
store: 'M2MResources',
initComponent: function() {
console.log('initComponent function in View has been called...');
this.columns = [
{header: 'friendly name',dataIndex: 'label',flex: 1, sortable: true},
{header: 'address unique', dataIndex: 'address_unique',flex: 1},
{header: 'address network', dataIndex: 'address_network', flex: 1},
{header: 'node status',dataIndex: 'status',flex: 1}
];
this.callParent(arguments);
Ext.getStore('M2MResources').guaranteeRange(0, 100);
}
});
不幸的是,商店似乎永远不会加载数据:网格面板显示&#34; loading ...&#34;符号和没有数据项显示。我怀疑问题是在我的直接方法返回的json中。客户端我得到以下json数据记录:
您能否建议如何解决这个问题?谢谢!
答案 0 :(得分:0)
响应数据与您的阅读器配置不匹配。您已使用 root:'data'为您配置了阅读器,但我在响应中可以看到它没有数据节点。您显示的展开节点是: root:'result.data'。我既看不到属性 successProperty 也不看 totalProperty 。
答案 1 :(得分:0)
好的,可以找到这个问题的理性答案here。基本上,服务器端直接方法必须是
形式@DirectMethod
public PartialResult<ResourceData> getM2Mresources(int start, int limit) {
ResourceData[] m2mResources = ...
//...
return new PartialResult<ResourceData>(Arrays.asList(m2mResources),
m2mResources.length);
}
其中PartialResult类如下:
public class PartialResult<T> {
/** the partial result set */
private Collection<T> result;
/** the size of the complete result set */
private int total;
public Collection<T> getResult() {
return this.result;
}
public int getTotal() {
return this.total;
}
public void setResult(Collection<T> result) {
this.result = result;
}
public void setTotal(int total) {
this.total = total;
}
public PartialResult(Collection<T> result, int total) {
super();
this.result = result;
this.total = total;
}
}
我在ResourceData类中添加了一些getter,就像在原始示例中一样。
js商店
Ext.define('AM.store.M2MResources', {
extend: 'Ext.data.DirectStore',
requires: 'Ext.direct.*', // use ext-direct for binding
model: 'AM.model.M2MResource',
autoLoad: true,
buffered: true,
pageSize: 20,
purgePageCount: 0,
leadingBufferZone: 60,
trailingBufferZone: 0,
constructor : function(config) {
config = config || {};
config.proxy = {
type: 'direct',
directFn : M2MResourceServlet.getM2Mresources,
reader: {
type: 'json',
root: 'result'
},
paramOrder: 'start,limit',
paramsAsHash: false
};
this.callParent([config]);
},
toString: function() {
return 'M2MResources: count = ' + this.getCount() + ', totalCount = '
+ this.getTotalCount();
}
});
显然,这正是我想做的事情。亚历山大戴维斯,谢谢你!无论如何,如果有人能解释为什么必须使用directFn
元素而不是api
,我将不胜感激...