javascript - ExtJs 4，有没有办法找到控件？ (不是 "id")

Question

我有一个带有 id = 'someid' 的按钮，我可以通过 Ext.getCmp('someid') 找到它...

有没有办法为该按钮设置某种“extraId”，并通过“extraId”找到该按钮？

Answer 1

问题是您想在哪里搜索以获取您的元素。

另一种方式可能是 itemId。

An itemId can be used as an alternative way to get a reference to a component when no object reference is available. Instead of using an id with Ext.getCmp, use itemId with Ext.container.Container.getComponent which will retrieve itemId's or id's. Since itemId's are an index to the container's internal MixedCollection, the itemId is scoped locally to the container -- avoiding potential conflicts with Ext.ComponentManager which requires a unique id.

来源和更多文档:http://docs.sencha.com/ext-js/4-0/#/api/Ext.AbstractComponent-cfg-itemId

ComponentQuery(由 wombleton 提到)也是一种好方法，但性能可能不如 itemId。