Ext 学习之旅 简单学习快乐学习之tree菜单优化和页面加载讲解
上一节中有写bug没有解决，这一节中将解决掉它，第一次写可能不够详细，有问题qq邮寄给我：380837242@qq.com，
先上代码：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><link type="text/css" rel="stylesheet" href="../../resources/css/ext-all.css" /><script type="text/javascript" src="../../adapter/ext/ext-base.js"></script><script type="text/javascript" src="../../ext-all.js"></script><link type="text/css" rel="stylesheet" href="../shared/examples.css" /><script type="text/javascript" src="../shared/examples.js"></script><title>index</title></head><body><script type="text/javascript">var tab = new Ext.TabPanel({id:'centerPage',region:'center',deferredRender:false,activeTab:0,title:"中央面板",resizeTabs:true, // turn on tab resizingminTabWidth: 115,tabWidth:135,enableTabScroll:true});Ext.onReady(function(){ new Ext.Viewport({enableTabScroll:true,layout:"border",items:[{id:'topPage',region:"north",//html: '<h1 style="overflow:auto;width:100%;height:100%"></div>'},{title: 'Item 2',border:false,html: '<div id="tree2" style="overflow:auto;width:100%;height:100%"></div>'},{title: 'Item 3',border:false,html: '<div id="tree3" style="overflow:auto;width:100%;height:100%"></div>'}]},{id:'rightPage',region:"east",width:100,collapsible: true,collapseMode: 'mini',//split: true,title:"右边面板"}]}); var root2=new Ext.tree.TreeNode({id:"root2",text:"树的根"});var c1=new Ext.tree.TreeNode({id:'c1',icon:'../../resources/images/yourtheme/menu/group-checked.gif',text:'源码网',listeners:{ 'click':function(node, event) { event.stopEvent(); var n = tab.getComponent(node.id); if (!n) { //判断是否已经打开该面板 n = tab.add({ 'id':node.id, 'title':node.text, closable:true, //通过html载入目标页 html:'<iframe scrolling="auto" frameborder="0" width="100%" height="100%" src="http://www.codefans.net"></iframe>' }); } tab.setActiveTab(n); } }});var c2=new Ext.tree.TreeNode({id:'c2',icon:'../../resources/images/yourtheme/menu/group-checked.gif',text:'博客园',listeners:{ 'click':function(node, event) { event.stopEvent(); var n = tab.getComponent(node.id); if (!n) { //判断是否已经打开该面板 n = tab.add({ 'id':node.id, 'title':node.text, closable:true, //通过html载入目标页 html:'<iframe scrolling="auto" frameborder="0" width="100%" height="100%" src="http://www.cnblogs.com/"></iframe>' }); } tab.setActiveTab(n); } }});var c3=new Ext.tree.TreeNode({id:'c3',icon:'../../resources/images/yourtheme/menu/group-checked.gif',text:'JavaEye',listeners:{ 'click':function(node, event) { event.stopEvent(); var n = tab.getComponent(node.id); if (!n) { //判断是否已经打开该面板 n = tab.add({ 'id':node.id, 'title':node.text, closable:true, //通过html载入目标页 html:'<iframe scrolling="auto" frameborder="0" width="100%" height="100%" src="http://www.iteye.com"></iframe>' }); } tab.setActiveTab(n); } }});var c4=new Ext.tree.TreeNode({id:'c4',icon:'../../resources/images/yourtheme/menu/group-checked.gif',text:'网易',listeners:{ 'click':function(node, event) { event.stopEvent(); var n = tab.getComponent(node.id); if (!n) { //判断是否已经打开该面板 n = tab.add({ 'id':node.id, 'title':node.text, closable:true, //通过html载入目标页 html:'<iframe scrolling="auto" frameborder="0" width="100%" height="100%" src="http://www.163.com"></iframe>' }); } tab.setActiveTab(n); } }});var c5=new Ext.tree.TreeNode({id:'c5',icon:'../../resources/images/yourtheme/menu/group-checked.gif',text:'新浪',listeners:{ 'click':function(node, event) { event.stopEvent(); var n = tab.getComponent(node.id); if (!n) { //判断是否已经打开该面板 n = tab.add({ 'id':node.id, 'title':node.text, closable:true, //通过html载入目标页 html:'<iframe scrolling="auto" frameborder="0" width="100%" height="100%" src="http://www.sina.com.cn"></iframe>' }); } tab.setActiveTab(n); } }});var c6=new Ext.tree.TreeNode({id:'c6',icon:'../../resources/images/yourtheme/menu/group-checked.gif',text:'百度',listeners:{ 'click':function(node, event) { event.stopEvent(); var n = tab.getComponent(node.id); if (!n) { //判断是否已经打开该面板 n = tab.add({ 'id':node.id, 'title':node.text, closable:true, //通过html载入目标页 html:'<iframe scrolling="auto" frameborder="0" width="100%" height="100%" src="http://www.baidu.com"></iframe>' }); } tab.setActiveTab(n); } }});var c7=new Ext.tree.TreeNode({id:'c7',icon:'../../resources/images/yourtheme/menu/group-checked.gif',text:'AddTable',listeners:{ 'click':function(node, event) { event.stopEvent(); var n = tab.getComponent(node.id); if (!n) { //判断是否已经打开该面板 n = tab.add({ title: 'New Tab ' + (++index),iconCls: 'tabs',html: 'Tab Body ' + (index) + '<br/><br/>'+ Ext.example.bogusMarkup,closable:true }); } tab.setActiveTab(n); } }});var c8=new Ext.tree.TreeNode({id:'c8',icon:'../../resources/images/yourtheme/menu/group-checked.gif',text:'upload',listeners:{ 'click':function(node, event) { event.stopEvent(); var n = tab.getComponent(node.id); if (!n) { //判断是否已经打开该面板 n = tab.add({ 'id':node.id, 'title':node.text, closable:true, //通过html载入目标页 html:'<iframe scrolling="auto" frameborder="0" width="100%" height="100%" src="upload.html"></iframe>' }); } tab.setActiveTab(n); } }});//c1.appendChild(c2);//c1.appendChild(c22);root2.appendChild(c1);root2.appendChild(c2);root2.appendChild(c3);root2.appendChild(c4);root2.appendChild(c5);root2.appendChild(c6);root2.appendChild(c7);root2.appendChild(c8);//root2.appendChild(c3)var tree2=new Ext.tree.TreePanel({renderTo:"tree1",root:root2, //对应 根节点animate:true,enableDD:false,border:false,rootVisible:false,lines:false,containerScroll: true});var index = 0; while(index < 7){ addTab(); } function addTab(){ tab.add({ title: 'New Tab ' + (++index), iconCls: 'tabs', html: 'Tab Body ' + (index) + '<br/><br/>' + Ext.example.bogusMarkup, closable:true }).show(); }new Ext.Button({ text: 'Add Tab',width:198, handler: addTab //iconCls:'new-tab' }).render(document.body, 'tree2');/*dialog = new Ext.ux.UploadDialog.Dialog({ url: 'upload-dialog-request.php', reset_on_hide: false, allow_close_on_upload: true, upload_autostart: true});dialog.show('tree3');*/function getDes(){alert(123);}new Ext.Button({ text: 'upload',width:198, handler: getDes //iconCls:'new-tab' }).render(document.body, 'tree3');});</script></body></html>把文件的路径后移了两个目录就可以直接显示数的菜单了，之前是图片照成的，我把代码注释一下讲解。但我觉得代码没有什么要说的，看一下就懂，我把上传文件的页面给加载进来，有不懂得直接发邮件给我，<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>Firefox3,IE6,IE7,IE8上传图片预览</title><style type="text/css">#preview_wrapper{display:inline-block;width:150px;height:150px;background-color:#CCC;}#preview_fake{ /* 该对象用于在IE下显示预览图片 */filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale);}#preview_size_fake{ /* 该对象只用来在IE下获得图片的原始尺寸，无其它用途 */filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=image);visibility:hidden;}#preview{ /* 该对象用于在FF下显示预览图片 */width:150px;height:150px;}</style><script type="text/javascript">function onUploadImgChange(sender){if( !sender.value.match( /.jpg|.gif|.png|.bmp/i ) ){alert('图片格式无效！');return false;}var objPreview = document.getElementById( 'preview' );var objPreviewFake = document.getElementById( 'preview_fake' );var objPreviewSizeFake = document.getElementById( 'preview_size_fake' );if( sender.files && sender.files[0] ){objPreview.style.display = 'block';objPreview.style.width = 'auto';objPreview.style.height = 'auto';// Firefox 因安全性问题已无法直接通过 input[file].value 获取完整的文件路径objPreview.src = sender.files[0].getAsDataURL();}else if( objPreviewFake.filters ){ // IE7,IE8 在设置本地图片地址为 img.src 时出现莫名其妙的后果//（相同环境有时能显示，有时不显示），因此只能用滤镜来解决// IE7, IE8因安全性问题已无法直接通过 input[file].value 获取完整的文件路径sender.select();var imgSrc = document.selection.createRange().text;objPreviewFake.filters.item('DXImageTransform.Microsoft.AlphaImageLoader').src = imgSrc;objPreviewSizeFake.filters.item('DXImageTransform.Microsoft.AlphaImageLoader').src = imgSrc;autoSizePreview( objPreviewFake, objPreviewSizeFake.offsetWidth, objPreviewSizeFake.offsetHeight );objPreview.style.display = 'none';}}function onPreviewLoad(sender){autoSizePreview( sender, sender.offsetWidth, sender.offsetHeight );}function autoSizePreview( objPre, originalWidth, originalHeight ){var zoomParam = clacImgZoomParam( 150, 150, originalWidth, originalHeight );objPre.style.width = zoomParam.width + 'px';objPre.style.height = zoomParam.height + 'px';objPre.style.marginTop = zoomParam.top + 'px';objPre.style.marginLeft = zoomParam.left + 'px';}function clacImgZoomParam( maxWidth, maxHeight, width, height ){var param = { width:width, height:height, top:0, left:0 };if( width>maxWidth || height>maxHeight ){rateWidth = width / maxWidth;rateHeight = height / maxHeight;if( rateWidth > rateHeight ){param.width = maxWidth;param.height = height / rateWidth;}else{param.width = width / rateHeight;param.height = maxHeight;}}param.left = (maxWidth - param.width) / 2;param.top = (maxHeight - param.height) / 2;return param;}</script></head><body><input id="upload_img" type="file" onchange="onUploadImgChange(this)"/><div id="preview_wrapper"><div id="preview_fake"><img id="preview" onload="onPreviewLoad(this)"/></div></div><br/><br/><img id="preview_size_fake"/></body></html> 
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