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Extjs4.2纯前台导出excel中不支持treepanel

Extjs4.2纯前台导出excel代码中,Button.js的构造函数中

this.on("afterrender", function () { // We wait for the combo to be rendered, so we can look up to grab the component containing it
            self.setComponent(self.store || self.component || self.up("gridpanel") || self.up("treepanel"), config);
        });

目测应该是支持treepanel的,结果测试结果为不支持treepanel,经查原来是在Worksheet.js中,关于buildRows方法中有这么一段代码

  buildRows: function () {
    var rows = [];
    this.store.each(function (record, index) {
      rows.push(this.buildRow(record, index));
    }, this);
    return rows;
  }

如果是treepanel,那个这里的store为TreeStore,但是TreeStore并没有each方法,所以导致这段代码无法继续执行。

Extjs4.2纯前台导出excel中不支持treepanel