Ext treepanel 加载时 默认选中第一条叶子节点
这篇文章的标题已经很清楚的表明这篇文章是要干嘛了，工作中遇到的问题，解决之后做个笔记，给其他的朋友一个思路的建议也不错，废话不多说，请看代码
//默认选中第一条叶子节点并展开 var panelStore = this.store; panelStore.on('load',function(store,node,records,successful,eOpts){if(successful && records.length>0 && node){for(var i = 0; i<records.length;i++){var leafNode = getLeafNode(node);if(leafNode!=''){Ext.getCmp('queryList').getSelectionModel().select(leafNode);if(!leafNode.get('expanded')){ leafNode.expand(); }break;}}} });getLeafNode = function(node){var leafNode='';if(node){if(!node.isLeaf()&&node.hasChildNodes()){var childrenNodes = node.childNodes;for(var i = 0;i<childrenNodes.length;i++){var childrenNode = childrenNodes[i];leafNode = getLeafNode(childrenNode);if(leafNode==''||leafNode==null){continue;}return leafNode;}}else if(node.isLeaf()){return node;}}//console.log('end:'+leafNode);return leafNode;}