metachange事件未被触发

时间:2015-07-13 11:59:15

标签: javascript extjs extjs5

我有一个商店,看起来像这样:

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'
         }            
    }
});

在控制器内我想要触发'metachange'事件。我试着这样做:

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?

1 个答案:

答案 0 :(得分:2)

仅当 rolldrum 元数据发生更改时才会触发metachange事件。这意味着当您的json数据源包含metaData对象时,代理的读者将看到并触发该事件。

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"
  }
}

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