Extjs保持当前选择项目在组合和添加新项目

问题描述

我有一个角色组合框，其中已经有3个项目（加载的用户模型）。现在我需要添加第四个项目到选择，但它不保留当前项目，当我添加第四个，它将是组合中选择的唯一项目。

有没有实现这种行为？
我的网格记录选择如下

  doSelectUser：function（grid，record）{
 var me = this; 
 var selectedRoleVals = record.get（'roles'）; 
 me.getUserForm（）。loadRecord（record）; 
  

然后点击用户表单中的组合框：

  manageusers userform combobox [name = roles]'：{
 select：this.doSelectRole 
} 
  
 
 
 
组合处理程序
  doSelectRole：function（combo，记录）{
 var me = 
 var rec = records [0]; 
  
 
 
解决方案
我怀疑你正在做类似
  combo.getStore（）。loadRecords（arrayOfRecords）; 
  
您需要执行
  combo.getStore（）。loadRecords（arrayOfRecords，{addRecords：true}）; 
  
  loadRecords 默认覆盖
 
 
 $ b 
 code> Ext.ComponentQuery.query（'combo [itemId = theComboItemId]'）[0] .getStore（）。add（{value：'aRoleValue'，displayText：'A new role'}）; 
  
 
I have a Role combo box which already have 3 item (loaded User Model). Now I need to add the 4th item to the selection but it doesn't keep the current items, and when I add the 4th one, it will be the only item selected in combo.
Is there anyway to implement this behavior ?    My grid record is selected like this
 doSelectUser: function(grid, record) {
        var me = this;
        var selectedRoleVals = record.get('roles');
        me.getUserForm().loadRecord(record);
And then I click the combo box in User Form:
 manageusers userform combobox[name=roles]': {
                select: this.doSelectRole
            }
combo handler
doSelectRole: function(combo, records) {
        var me =
        var rec = records[0];
 解决方案 
I suspect you are doing something like
combo.getStore().loadRecords(arrayOfRecords);
You need to be doing
combo.getStore().loadRecords(arrayOfRecords, {addRecords: true});
loadRecords by default overwrites the contents of the store with the new data.
And to add a simple record to your combo box
Ext.ComponentQuery.query('combo[itemId=theComboItemId]')[0].getStore().add({value: 'aRoleValue', displayText: 'A new role'});
                        
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