metachange 事件没有被触发

问题描述

我有一家商店，看起来像这样:

I have a store, which looks like this:

Ext.define('GridGeneral.store.GridGeneralStore',{
    extend:'Ext.data.Store',
    model:'GridGeneral.model.GridGeneralModel',
    autoLoad:true,
    proxy:{
         type:'ajax',
         url:'/api/grid/gridgeneralstore.php',
         reader:{
             type:'json'
         }
    }
});

在控制器中，我想触发 `metachange' 事件.我试着这样做:

Inside a controller I want to fire `metachange' event. I try to do it like this:

init:function(){
    Ext.getStore('GridGeneralStore').addListener('metachange',this.metaChanged, this);
    //^^^not fired
    Ext.getStore('GridGeneralStore').addListener('load',this.loaded, this);
    //^^^ this is ok
},
metaChanged:function(store, meta){
    console.log('metaChanged');  // see nothing in the colsole
},
loaded:function(){
    console.log('loaded');    // everything works fine!
}

那么，我做错了什么?

推荐答案

metachange 事件仅在 rolldrum 元数据发生更改时触发.这意味着当您的 json 数据源包含一个元数据对象时，代理的读取器将看到该对象并触发该事件.

The metachange event is only fired when rolldrum metadata has changed. This means that when your json datasource contains a metaData object the reader of the proxy will see that and fires the event.

http://docs.sencha.com/extjs/5.1/5.1.1-apidocs/#!/api/Ext.data.reader.Reader-property-metaData

JSON:

{
  data: [{ ... }],
  msg: "...",
  total: 99,
  metaData: {
    fields: [{ ... }],
    columns: [{ ... }],
    idProperty: "id",
    messageProperty: "msg",
    root: "data"
  }
}

示例:http://docs.sencha.com/extjs/4.2.3/extjs-build/examples/data/meta-config-basic.html

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