创建树如 所示，Ext JS 还提供树控件，这种控件提供用户熟悉的与文件系统相似的视图。Ext JS 树控件完全支持拖放功能。图 3 所示树控件的源代码见 清单 4。
图 3. Ext JS 树控件 清单 4. Ext JS 树控件的源代码1
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| var TreeTest = function(){
// shorthand
var Tree = Ext.tree;
return {
init : function(){
// yui-ext tree
var tree = new Tree.TreePanel({
el:'tree',
animate:true,
autoScroll:true,
loader: new Tree.TreeLoader({dataUrl:'get-nodes.php'}),
enableDD:true,
containerScroll: true,
dropConfig: {appendOnly:true}
});
// add a tree sorter in folder mode
new Tree.TreeSorter(tree, {folderSort:true});
// set the root node
var root = new Tree.AsyncTreeNode({
text: 'Ext JS',
draggable:false, // disable root node dragging
id:'source'
});
tree.setRootNode(root);
// render the tree
tree.render();
root.expand(false, /*no anim*/ false);
//-------------------------------------------------------------
// YUI tree
var tree2 = new Tree.TreePanel({
el:'tree2',
animate:true,
autoScroll:true,
loader: new Ext.tree.TreeLoader({
dataUrl:'get-nodes.php',
baseParams: {lib:'yui'} // custom http params
}),
containerScroll: true,
enableDD:true,
dropConfig: {appendOnly:true}
});
// add a tree sorter in folder mode
new Tree.TreeSorter(tree2, {folderSort:true});
// add the root node
var root2 = new Tree.AsyncTreeNode({
text: 'My Files',
draggable:false,
id:'yui'
});
tree2.setRootNode(root2);
tree2.render();
root2.expand(false, /*no anim*/ false);
}
};
}();
Ext.EventManager.onDocumentReady(TreeTest.init, TreeTest, true);
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网格最强大的 Ext JS 用户界面元素可能是网格控件。可以通过它显示来自后端数据源的数据和其他结构化数据，比如 XML 和数组。如 所示，Ext JS 网格可以实现分页和列排序。这个示例接收来自 ExtJS.com 论坛的最新主题，强调了 Ext JS 框架的 Ajax 功能。图 4 所示网格的源代码见 。
图 4. Ext JS 网格控件 清单 5. Ext JS 网格控件的源代码1
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| Ext.onReady(function(){
// create the Data Store
var store = new Ext.data.Store({
// load using script tags for cross domain, if the data in on the same domain as
// this page, an HttpProxy would be better
proxy: new Ext.data.ScriptTagProxy({
url: 'http://extjs.com/forum/topics-browse-remote.php'
}),
// create reader that reads the Topic records
reader: new Ext.data.JsonReader({
root: 'topics',
totalProperty: 'totalCount',
id: 'threadid',
fields: [
'title', 'forumtitle', 'forumid', 'author',
{name: 'replycount', type: 'int'},
{name: 'lastpost', mapping: 'lastpost', type: 'date',
dateFormat: 'timestamp'},
'lastposter', 'excerpt'
]
}),
// turn on remote sorting
remoteSort: true
});
store.setDefaultSort('lastpost', 'desc');
// pluggable renders
function renderTopic(value, p, record){
return String.format(
'<b><a href="http://extjs.com/forum/showthread.php?t={2}"
target="_blank">{0}</a></b>
<a href="http://extjs.com/forum/forumdisplay.php?f={3}"
target="_blank">{1} Forum</a>',
value, record.data.forumtitle, record.id, record.data.forumid);
}
function renderLast(value, p, r){
return String.format('{0}<br/>by {1}', value.dateFormat('M j, Y, g:i a'),
r.data['lastposter']);
}
// the column model has information about grid columns
// dataIndex maps the column to the specific data field in
// the data store
var cm = new Ext.grid.ColumnModel([{
id: 'topic',
header: "Topic",
dataIndex: 'title',
width: 420,
renderer: renderTopic
},{
header: "Author",
dataIndex: 'author',
width: 100,
hidden: true
},{
header: "Replies",
dataIndex: 'replycount',
width: 70,
align: 'right'
},{
id: 'last',
header: "Last Post",
dataIndex: 'lastpost',
width: 150,
renderer: renderLast
}]);
// by default columns are sortable
cm.defaultSortable = true;
var grid = new Ext.grid.GridPanel({
el:'topic-grid',
width:700,
height:500,
title:'ExtJS.com - Browse Forums',
store: store,
cm: cm,
trackMouseOver:false,
sm: new Ext.grid.RowSelectionModel({selectRow:Ext.emptyFn}),
loadMask: true,
viewConfig: {
forceFit:true,
enableRowBody:true,
showPreview:true,
getRowClass : function(record, rowIndex, p, store){
if(this.showPreview){
p.body = '<p>'+record.data.excerpt+'</p>';
return 'x-grid3-row-expanded';
}
return 'x-grid3-row-collapsed';
}
},
bbar: new Ext.PagingToolbar({
pageSize: 25,
store: store,
displayInfo: true,
displayMsg: 'Displaying topics {0} - {1} of {2}',
emptyMsg: "No topics to display",
items:[
'-', {
pressed: true,
enableToggle:true,
text: 'Show Preview',
cls: 'x-btn-text-icon details',
toggleHandler: toggleDetails
}]
})
});
// render it
grid.render();
// trigger the data store load
store.load({params:{start:0, limit:25}});
function toggleDetails(btn, pressed) {
var view = grid.getView();
view.showPreview = pressed;
view.refresh();
}
});
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