解决Ext JS 4.1版本Tree在刷新时选择第一行的问题

在4.0.7版之前的版本都可通过select方法进行处理，但是4.1之后就不行了。经研究，问题出现在渲染过程上。下面通过一个例子测试一下。

测试示例代码：

<!DOCTYPE html>
<html>
<head>
<title></title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<link rel="stylesheet" type="text/css" href="extjs/resources/css/ext-all.css")" />
<script type="text/javascript" src="extjs/bootstrap.js")"></script>
</head>
<body>
<script>
Ext.onReady(function() {
if(Ext.BLANK_IMAGE_URL.substr(0,4)!="data"){
Ext.BLANK_IMAGE_URL="./images/s.gif";
}
Ext.create("Ext.data.TreeStore",{
proxy: {
type: 'ajax',
url:"tree.js"
},
storeId:"TestStore"
});
Ext.widget("treepanel",{
title: "Tree Test", rootVisible: false, store: "TestStore",
renderTo:Ext.getBody(),
width:400,height:600,
viewConfig:{
listeners:{
refresh:function(view){
view.getSelectionModel().select(0);
}
}
}
});
});
</script>
</body>
</html>

加载的树节点代码（tree.js）：

[
{
"id": "all",
"text": "All",
"leaf": true
},
{
"id": "ALFKI",
"text": "Alfreds Futterkiste",
"leaf": true
},
{
"id": "ANATR",
"text": "Ana Trujillo Emparedados y helados",
"leaf": true
},
{
"id": "ANTON",
"text": "Antonio Moreno Taquería",
"leaf": true
},
{
"id": "AROUT",
"text": "Around the Horn",
"leaf": true
},
{
"id": "BERGS",
"text": "Berglunds snabbk?p",
"leaf": true
},
{
"id": "BLAUS",
"text": "Blauer See Delikatessen",
"leaf": true
},
{
"id": "BLONP",
"text": "Blondesddsl père et fils",
"leaf": true
},
{
"id": "BOLID",
"text": "Bólido Comidas preparadas",
"leaf": true
},
{
"id": "BONAP",
"text": "Bon app'",
"leaf": true
},
{
"id": "BOTTM",
"text": "Bottom-Dollar Markets",
"leaf": true
},
{
"id": "BSBEV",
"text": "B's Beverages",
"leaf": true
},
{
"id": "CACTU",
"text": "Cactus Comidas para llevar",
"leaf": true
},
{
"id": "CENTC",
"text": "Centro comercial Moctezuma",
"leaf": true
},
{
"id": "CHOPS",
"text": "Chop-suey Chinese",
"leaf": true
},
{
"id": "COMMI",
"text": "Comércio Mineiro",
"leaf": true
},
{
"id": "CONSH",
"text": "Consolidated Holdings",
"leaf": true
},
{
"id": "WANDK",
"text": "Die Wandernde Kuh",
"leaf": true
},
{
"id": "DRACD",
"text": "Drachenblut Delikatessen",
"leaf": true
},
{
"id": "DUMON",
"text": "Du monde entier",
"leaf": true
},
{
"id": "EASTC",
"text": "Eastern Connection",
"leaf": true
},
{
"id": "ERNSH",
"text": "Ernst Handel",
"leaf": true
},
{
"id": "FAMIA",
"text": "Familia Arquibaldo",
"leaf": true
},
{
"id": "FISSA",
"text": "FISSA Fabrica Inter. Salchichas S.A.",
"leaf": true
},
{
"id": "FOLIG",
"text": "Folies gourmandes",
"leaf": true
},
{
"id": "FOLKO",
"text": "Folk och f? HB",
"leaf": true
},
{
"id": "FRANR",
"text": "France restauration",
"leaf": true
},
{
"id": "FRANS",
"text": "Franchi S.p.A.",
"leaf": true
},
{
"id": "FRANK",
"text": "Frankenversand",
"leaf": true
},
{
"id": "FURIB",
"text": "Furia Bacalhau e Frutos do Mar",
"leaf": true
},
{
"id": "GALED",
"text": "Galería del gastrónomo",
"leaf": true
},
{
"id": "GODOS",
"text": "Godos Cocina Típica",
"leaf": true
},
{
"id": "GOURL",
"text": "Gourmet Lanchonetes",
"leaf": true
},
{
"id": "GREAL",
"text": "Great Lakes Food Market",
"leaf": true
},
{
"id": "GROSR",
"text": "GROSELLA-Restaurante",
"leaf": true
},
{
"id": "HANAR",
"text": "Hanari Carnes",
"leaf": true
},
{
"id": "HILAA",
"text": "HILARION-Abastos",
"leaf": true
},
{
"id": "HUNGC",
"text": "Hungry Coyote Import Store",
"leaf": true
},
{
"id": "HUNGO",
"text": "Hungry Owl All-Night Grocers",
"leaf": true
},
{
"id": "ISLAT",
"text": "Island Trading",
"leaf": true
},
{
"id": "KOENE",
"text": "K?niglich Essen",
"leaf": true
},
{
"id": "LACOR",
"text": "La corne d'abondance",
"leaf": true
},
{
"id": "LAMAI",
"text": "La maison d'Asie",
"leaf": true
},
{
"id": "LAUGB",
"text": "Laughing Bacchus Wine Cellars",
"leaf": true
},
{
"id": "LAZYK",
"text": "Lazy K Kountry Store",
"leaf": true
},
{
"id": "LEHMS",
"text": "Lehmanns Marktstand",
"leaf": true
},
{
"id": "LETSS",
"text": "Let's Stop N Shop",
"leaf": true
},
{
"id": "LILAS",
"text": "LILA-Supermercado",
"leaf": true
},
{
"id": "LINOD",
"text": "LINO-Delicateses",
"leaf": true
},
{
"id": "LONEP",
"text": "Lonesome Pine Restaurant",
"leaf": true
},
{
"id": "MAGAA",
"text": "Magazzini Alimentari Riuniti",
"leaf": true
},
{
"id": "MAISD",
"text": "Maison Dewey",
"leaf": true
},
{
"id": "MEREP",
"text": "Mère Paillarde",
"leaf": true
},
{
"id": "MORGK",
"text": "Morgenstern Gesundkost",
"leaf": true
},
{
"id": "NORTS",
"text": "North/South",
"leaf": true
},
{
"id": "OCEAN",
"text": "Océano Atlántico Ltda.",
"leaf": true
},
{
"id": "OLDWO",
"text": "Old World Delicatessen",
"leaf": true
},
{
"id": "OTTIK",
"text": "Ottilies K?seladen",
"leaf": true
},
{
"id": "PARIS",
"text": "Paris spécialités",
"leaf": true
},
{
"id": "PERIC",
"text": "Pericles Comidas clásicas",
"leaf": true
},
{
"id": "PICCO",
"text": "Piccolo und mehr",
"leaf": true
},
{
"id": "PRINI",
"text": "Princesa Isabel Vinhos",
"leaf": true
},
{
"id": "QUEDE",
"text": "Que Delícia",
"leaf": true
},
{
"id": "QUEEN",
"text": "Queen Cozinha",
"leaf": true
},
{
"id": "QUICK",
"text": "QUICK-Stop",
"leaf": true
},
{
"id": "RANCH",
"text": "Rancho grande",
"leaf": true
},
{
"id": "RATTC",
"text": "Rattlesnake Canyon Grocery",
"leaf": true
},
{
"id": "REGGC",
"text": "Reggiani Caseifici",
"leaf": true
},
{
"id": "RICAR",
"text": "Ricardo Adocicados",
"leaf": true
},
{
"id": "RICSU",
"text": "Richter Supermarkt",
"leaf": true
},
{
"id": "ROMEY",
"text": "Romero y tomillo",
"leaf": true
},
{
"id": "SANTG",
"text": "Santé Gourmet",
"leaf": true
},
{
"id": "SAVEA",
"text": "Save-a-lot Markets",
"leaf": true
},
{
"id": "SEVES",
"text": "Seven Seas Imports",
"leaf": true
},
{
"id": "SIMOB",
"text": "Simons bistro",
"leaf": true
},
{
"id": "SPECD",
"text": "Spécialités du monde",
"leaf": true
},
{
"id": "SPLIR",
"text": "Split Rail Beer & Ale",
"leaf": true
},
{
"id": "SUPRD",
"text": "Suprêmes délices",
"leaf": true
},
{
"id": "THEBI",
"text": "The Big Cheese",
"leaf": true
},
{
"id": "THECR",
"text": "The Cracker Box",
"leaf": true
},
{
"id": "TOMSP",
"text": "Toms Spezialit?ten",
"leaf": true
},
{
"id": "TORTU",
"text": "Tortuga Restaurante",
"leaf": true
},
{
"id": "TRADH",
"text": "Tradi??o Hipermercados",
"leaf": true
},
{
"id": "TRAIH",
"text": "Trail's Head Gourmet Provisioners",
"leaf": true
},
{
"id": "VAFFE",
"text": "Vaffeljernet",
"leaf": true
},
{
"id": "VICTE",
"text": "Victuailles en stock",
"leaf": true
},
{
"id": "VINET",
"text": "Vins et alcools Chevalier",
"leaf": true
},
{
"id": "WARTH",
"text": "Wartian Herkku",
"leaf": true
},
{
"id": "WELLI",
"text": "Wellington Importadora",
"leaf": true
},
{
"id": "WHITC",
"text": "White Clover Markets",
"leaf": true
},
{
"id": "WILMK",
"text": "Wilman Kala",
"leaf": true
},
{
"id": "WOLZA",
"text": "Wolski Zajazd",
"leaf": true
}
]

如果按以前习惯，使用“view.getSelectionModel().select(0);”，Firebug会提示以下错误：

o is undefined
return o.id; ext-all-debug.js (第 43468 行)

将“view.getSelectionModel().select(0);”修改为“console.log(view)”，Firebug提示以下：

[试用版] Ext.tree.View [0] { id="treeview-1012"} tree.html (第 32 行)
[试用版] Ext.tree.View [1] { id="treeview-1012"} tree.html (第 32 行)

这里居然触发了两次refresh事件，问题就出现在第一次的触发上，修改代码为：

console.log(view.node.firstChild)

Firebug提示：

null
tree.html (第 33 行)
[试用版] Ext.data.Store.ImplicitModel-TestStore { id="Ext.data.Store.ImplicitModel-TestStore-all", internalId="all"}
tree.html (第 33 行)

从这里就很明显看到了，第一触发refresh事件时，根节点的第一个节点为null，执行select方法肯定找不到选择节点。因而要正确进行选择，就必须判断firstChild是否存在，如果存在，才进行选择。因而，将代码修改为如下代码即可正确选择第一行了：

var node=view.node.firstChild;
if(node){
view.getSelectionModel().select(node);
}

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