动态添加项目到边框视口 [英] dynamic add items to border viewport

问题描述

我想先创建一个空的视口（layout：border），然后添加项目，最后渲染和显示。
但是当我创建了viewport元素时，会抛出一个错误，说：

I want to create a empty viewport(layout:border) first, then add items to it, finally render and show. but when I created the viewport element, it throw an error, says:

未捕获TypeError：无法读取属性flex未定义

Uncaught TypeError: Cannot read property 'flex' of undefined

这是我的代码：

<script type="text/javascript" src="ext-4.0.2a/bootstrap.js"></script>
<script>
Ext.require(['*']);
Ext.onReady(function() {
    Ext.QuickTips.init();

    var viewport = Ext.create('Ext.container.Viewport', {
        layout: 'border'
    });

    var north = blablabla...
    viewport.add([north,south]);

    viewport.doLayout();
});
</script>

推荐答案

根据从 docs ：

BorderLayout的区域在渲染时固定，此后，其子组件可能无法删除或添加。要在BorderLayout中添加/删除组件，请它们由一个由BorderLayout直接管理的附加容器包裹。

The regions of a BorderLayout are fixed at render time and thereafter, its child Components may not be removed or added.To add/remove Components within a BorderLayout, have them wrapped by an additional Container which is directly managed by the BorderLayout.

顺便说一下

任何使用边框布局的容器必须有一个子项，区域为：'center'

Any Container using the Border layout must have a child item with region:'center'

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