Ext.Component组件学习

1：基本

    Base class for all Ext components. All subclasses of Component may participate in the automated Ext component lifecycle of creation, rendering and destruction which is provided by the Container class. Components may be added to a Container through the items config option at the time the Container is created, or they may be added dynamically via the add method.The Component base class has built-in support for basic hide/show and enable/disable behavior.

   该类继承于Ext.util.Observable，是Ext Js中所有组件的基类，它的所有子类都自动享有了标准Ext Js组件的生命周期，包括创建，渲染和销毁等，它们都自动支持了标准的隐藏/显示以及启用/禁用等操作

    All Components are registered with the Ext.ComponentMgr on construction so that they can be referenced at any time via Ext.getCmp, passing the id.

   All user-developed visual widgets that are required to participate in automated lifecycle and size management should subclass Component (or Ext.BoxComponent if managed box model handling is required, ie height and width management).

   所有组件都允许在Ext.Container及其子类中进行延迟渲染，也可以把组件注册到Ext.ComponentMgr中，这就可以在任何地方使用Ext.getCmp()函数，同时使用id获得对应的组件

2：属性中需要注意的

fieldLabel : String

The label text to display next to this Component (defaults to ''). Note: this config is only used when this Component...

The label text to display next to this Component (defaults to '').

Note: this config is only used when this Component is rendered by a Container which has been configured to use the FormLayout layout manager (e.g. Ext.form.FormPanel or specifying layout:'form').

Also see hideLabel and Ext.layout.FormLayout.fieldTpl.

Example use:

new Ext.FormPanel({    height: 100,    renderTo: Ext.getBody(),    items: [{        xtype: 'textfield',        fieldLabel: 'Name'    }]});