Treepanel :Treepanel selectionChange之后会触发哪个事件？

Question

我想在ExtJS TreePanel中强制选择RootNode，然后在treepanel的selectionchange事件中执行一些操作。之后，我想从treepanel中获取选定的行，并将其作为事件参数进行传递。我可以使用给定的代码来实现它，但有时'selModel.getSelection()‘不能获得所有选定的行。可能在完成selectionchange事件之前，它正在执行下一行。

var tree = this.getTree();
var selModel = tree.getSelectionModel();
selModel.select(tree.getRootNode()); // fires selectionchange event

var selectedRows = selModel.getSelection(); 
if (selectedRows.length > 0) {
//Here I fire another event by passing selectedRows as parameter
}

selectionchange: function(){
//some looping operation
}

如果有人能帮我的话就太好了。谢谢

Answer 1

不知道为什么要调用这段代码：selModel.select(tree.getRootNode());

这样做不会更有效率

替换为：

var tree = this.getTree();
var selModel = tree.getSelectionModel();
selModel.select(tree.getRootNode()); // fires selectionchange event

var selectedRows = selModel.getSelection(); 
if (selectedRows.length > 0) {
//Here I fire another event by passing selectedRows as parameter
}

selectionchange: function(){
//some looping operation
}

然后这样做：

var tree = this.getTree();
var selectedRows= tree.getSelectionModel().getSelection();//This line grab all selected items by user.
//rest code the same
if (selectedRows.length > 0) {
//Here I fire another event by passing selectedRows as parameter
}