Extjs grid checkbox selected based on data Initialization

Background: Based on business needs, you need to load a lot of data in the grid, and then determine whether the data is selected based on a certain attribute of each data.

Process: google found that a foreigner provided the following methods.

Ext. ajax. request ({method: 'post', url: 'index. php/mapper/get_tag_subfields/', scope: this, params: {id: this. gridB. getSelectionModel (). getSelection () [0]. data. id,}, success: function (xhr) {var json = Ext. decode (xhr. responseText); // make sure to decode for loadData to work // data is formatted, just needto load data storeMapperSubfields. loadData (json. data); // mark checkboxes if (json. data. length) {for (var I = 0; I
 
  

  

  

  
 
  
Source Document
   
  


  
However, an error is reported in the red line when I use it. Views [0] cannot be found.
  
The following is my code:
  

  
Ext. ajax. request ({url: '/aaaaaaaaaaa/bbbbbbbbbbbbbbb. do ', method: 'post', params: {methodName: 'aaaaaaaaaaaaa', policyid: policyid, appid: appid}, success: function (response, options) {var result = Ext. JSON. decode (response. responseText); var editTitle = "collection policy" + policyName + 'Operation request modified'; var editPolicyPanelOpers = new PM. view. policy. policyEditOpers ({title: editTitle //, // data: result. data}); // set polic Yid Ext. componentQuery. query ('window # policyeditopers textfield # selectpolicyid') [0]. setValue (policyid); Ext. componentQuery. query ('window # policyeditopers textfield # selectAppid ') [0]. setValue (appid); var operGrid = Ext. componentQuery. query ('window # policyeditopers grid # oper_grid ') [0]; var opersStore = Ext. getStore ('businessoperstore'); if ("undefined "! = Typeof opersStore) {opersStore. loadData (result. data); operGrid. reconfigure (opersStore); for (var I = 0; I <result. data. length; I ++) {var rec = operGrid. store. getById (result. data [I]. businessoperid); // json. data [I]. getId () if (rec. data. selected = true) {// select all records have's 'opergrid. getSelectionModel (). select (rec, true, false) ;}}// you can specify appid editPolicyPanelOpers. show () ;}, failure: function () {var o = Ext. JSON. decode (response. responseText); // alert (o. msg); Ext. msg. alert ('prompt information', o. message );}});
  

  
Check the select (rec, true, false) method. The rec parameter is either an index or a record instance.
At the same time, he said it was a rendering problem. It indicates that I am calling something wrong.
The next step is self-defeating: I checked the source code and found that the property selected is private. It cannot be used to set whether to select or not.
After several hours, I thought of my colleague again.
Finally, I practiced it patiently. This is indeed the problem. The problem was solved, but it took one afternoon and one night.
  
The following is a code snippet:
  

  
init:function(){this.control({  'policyeditopers grid#oper_grid':{  afterrender:this.selectModel  }});},selectModel:function(){Ext.Msg.alert('selectModel','test'); var operGrid = Ext.ComponentQuery.query('window#policyeditopers grid#oper_grid')[0];for (var i = 0; i < operGrid.getSelectionModel().store.data.items.length; i++){            var rec = operGrid.store.getById(operGrid.getSelectionModel().store.data.items[i].data.businessoperid); // json.data[i].getId()            if (rec.data.selected == true){ // select all records have have 's'            operGrid.getSelectionModel().select(rec,true,false);            }        }}