extjs750 treepicker 绑定store异常

版本

extjs 7.x classic ux包

现象

使用treepicker绑定store时报错：

TypeError: Cannot read properties of null (reading ‘$eventOptions’)
at constructor.addManagedListener (Observable.js?_dc=1641516240871:577)
at constructor.aliasOneMember. [as mon] (Base.js?_dc=1641516240871:1175)
at constructor.initComponent (TreePicker.js?_dc=1641516240875:67)
at constructor (Component.js?_dc=1641516240871:2268)

原因

绑定在beforerender中初始化
treepicker时在initComponent中给store添加事件监听，此时绑定尚未初始化，store值为null,导致异常

解决

覆盖默认实现，改为在updateStore时添加事件监听

Ext.define('PSR.overrides.Ext.ux.TreePicker', {
    override: 'Ext.ux.TreePicker',
    initComponent: function() {
        var me = this;
        this.store = this.store || Ext.data.StoreManager.lookup('ext-empty-store');
        me.callParent(arguments);
    },
    updateStore:function(store){
        this.mon(store, {
            scope: this,
            load: this.onLoad,
            update: this.onUpdate
        });
    },
});

源码

node_modules/@sencha/ext-ux/classic/src/TreePicker.js

initComponent: function() {
    var me = this;
    me.callParent(arguments);
    me.mon(me.store, {
        scope: me,
        load: me.onLoad,
        update: me.onUpdate
    });
},