javascript - ExtJS:如何动态地将子节点添加到树面板

Question

如何使用 JavaScript 以编程方式向现有 TreePanel 添加子节点？

我有一个显示 map 事件图层的 TreePanel(使用 GeoExt):

treeConfig = new OpenLayers.Format.JSON().write([{
    nodeType: "gx_baselayercontainer",
    text: "Base layers",
    expanded: true
    }, {
    nodeType: "gx_overlaylayercontainer",
    text: "Overlays",
    expanded: true,
    loader: {
        baseAttrs: {
            radioGroup: "foo",
            uiProvider: "use_radio"
        }
    }
}], true);

treePanel = new Ext.tree.TreePanel({
    id: 'mainpanel',
    border: true,
    region: "west",
    title: "Map layers",
    width: 200,
    split: true,
    collapsible: true,
    margins: '0 0 5 5',
    collapseMode: "mini",
    autoScroll: true,
    loader: new Ext.tree.TreeLoader({
        applyLoader: false,
        uiProviders: {
            "use_radio": LayerNodeUI
        }
    }),
    root: {
        nodeType: "async",
        children: Ext.decode(treeConfig)
    },
    listeners: {
        "radiochange": function(node){
            alert(node.layer.name + " is now the the active layer.");
        }
    },
    rootVisible: false,
    lines: false
});

用户应该能够通过按下按钮来添加覆盖层，但是我似乎找不到任何关于如何完成此操作的示例。

有什么想法吗？

Answer 1

通过getNodeById抓取父节点或 getRootNode并添加带有 appendChild 的子节点.