extjs 4使用PHP和MySQL在treepanel中添加复选框

this is the extjs 4 code:

这是extjs 4代码:

checktree.js

Ext.require([
    'Ext.tree.*',
    'Ext.data.*',
    'Ext.window.MessageBox'
]);

Ext.onReady(function() {
    var store = Ext.create('Ext.data.TreeStore', {
        proxy: {
            type: 'ajax',
            url: 'tree.php',
     node:'id' // send the parent id through GET (default 0)
        }
    });

    var tree = Ext.create('Ext.tree.Panel', {
        store: store,
        rootVisible: false,
        useArrows: true,
        frame: true,
        title: 'Check Tree',
        renderTo: 'tree-div',
        width: 289,
        height: 220,
        dockedItems: [{
            xtype: 'toolbar',
            items: {
                text: 'Get checked nodes',
                handler: function(){
                    var records = tree.getView().getChecked(),
                        names = [];

                    Ext.Array.each(records, function(rec){
                        names.push(rec.get('text'));
                    });

                    Ext.MessageBox.show({
                        title: 'Selected Nodes',
                        msg: names.join('<br />'),
                        icon: Ext.MessageBox.INFO
                    });
                }
            }
        }]
    }); 
});
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