Javascript 如何在extjs中动态创建组合框multiselect/singleselect

我正在使用extjs4.1中从组合框扩展的Boxselect。根据某些条件，我需要选择单个或多个

这是我的密码

bool result;
result = getData();
if(result)
{
  Ext.getCmp("combo1").multiSelect =true
}

---

这不会将组合框更改为multiselect。有什么想法吗

尝试使用Ext.apply方法

combo = Ext.getCmp.....  
Ext.apply(combo, {multiSelect: true});

---

当

multiSelect

选项更改时，必须强制重新创建选择器。为此，您需要删除组合的属性

picker

：

 combo.multiSelect = true;
 delete combo.picker;

完整示例：

Ext.widget('panel', {
    renderTo: Ext.getBody(),
    layout: {type: 'vbox', align: 'center'},
    margin: 10,
    defaults: {width: 200, margin: 5},
    items: [{
        xtype: 'combo',
        store: ['Foo', 'Bar', 'Baz']
    },{
        xtype: 'displayfield',
        fieldLabel: 'Multiselect is',
        value: "OFF"
    },{
        xtype: 'button',
        text: "Toggle multiselect",
        handler: function() {
            var panel = this.up(),
                combo = panel.down('combo'),
                outField = panel.down('displayfield'),
                newValue = !combo.multiSelect;
            combo.multiSelect = newValue;
            // force recreation of picker
            delete combo.picker;
            outField.setValue(newValue ? "ON" : "OFF");
        }
    }]
});

-1，apply（）将具有与问题中的代码完全相同的效果。