ExtJS:如何将子节点动态添加到treepanel

时间:2010-07-07 11:56:34

标签: javascript extjs openlayers

如何使用JavaScript以编程方式将子节点添加到现有TreePanel?

我有一个TreePanel,显示地图的活动图层(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添加覆盖图层,但我似乎无法找到有关如何实现此目的的任何示例。

有什么想法吗?

3 个答案:

答案 0 :(得分:3)

getNodeByIdgetRootNode抓取父节点,并使用appendChild添加子节点。

答案 1 :(得分:0)

请参阅以下示例:

http://dev.geoext.org/geoext/trunk/geoext/examples/layercontainer.html

是否定义了treePanel的layers属性?

treePanel.layers.add(layer);

答案 2 :(得分:0)

这是动态附加子树到树面板的示例代码

Ext.getCmp('treeid').getRootNode().appendChild(response from database);