ext继承的两种写法
转自：http://liuna718-163-com.iteye.com/blog/805377在使用extjs时，因为特殊的业务要求，extjs提供的功能不能满足业务逻辑，所以需要对其进行扩展，也就是所谓的继承，
在extjs中继承有两种写法
1。在ExtJS中使用Ext.extend()函数实现继承功能：
/* *扩展树的多选模式，加了写业务逻辑方法validNodeHasFolder，并重写了select方法加入了业务逻辑 **/Ext.ns("Ext.targsoft");Ext.targsoft.MultiSelectionModel = function(config){ Ext.apply(this, config); Ext.targsoft.MultiSelectionModel.superclass.constructor.call(this);}; Ext.extend(Ext.targsoft.MultiSelectionModel , Ext.tree.MultiSelectionModel,{ validCount : 0 , select : function(node, e, keepExisting){ if(keepExisting !== true){ this.clearSelections(true); } if(this.isSelected(node)){ this.lastSelNode = node; return node; } if(!node.isLeaf() && keepExisting ){ return ; } if(keepExisting && node.isLeaf() && this.validCount == 0 ){ alert(this.validCount ); this.validNodeHasFolder(); } this.selNodes.push(node); this.selMap = node; this.lastSelNode = node; node.ui.onSelectedChange(true); this.fireEvent("selectionchange", this, this.selNodes); return node; }, //判断选择的节点中是否含有文件夹，如果有那么就进行反选 validNodeHasFolder : function(){ this.validCount = 1 ; for(var i=0 ; i< this.selNodes.length ; i++){ if(!this.selNodes.isLeaf()){ this.unselect(this.selNodes); } } } });
2.Extjs中替换constructor，写法如下：
Ext.ns('Ext.formdesign');Ext.formdesign.FormSort = Ext.extend(Ext.Window ,{ constructor : function(_cfg){ Ext.apply(this,_cfg); this.grid = this.createGrid(); Ext.formdesign.FormSort.superclass.constructor.call(this,{ title : '表单类别' , width : 280 , height : 270 , closeAction : 'close' , items : , buttons : [ { text : '关闭' , scope : this , handler : function(){ this.close(); } } ] }) }, //创建表格 createGrid : function(){ //搜索 var searchObjRecs = Ext.data.Record.create([ {name: 'formSortUuid', mapping: 'formSortUuid'}, {name: 'sortName', mapping: 'sortName'}, {name: 'description', mapping: 'description'} ]); var searchObjSm = new Ext.grid.CheckboxSelectionModel({header : '' ,singleSelect: true}); var searchObjStore = new Ext.data.Store({ url : this.contextPath+'/formsort.do?method=getFormSortDatas', autoLoad : false , reader: new Ext.data.JsonReader( { totalProperty: "total", root: 'data', id: 'formSortUuid' },searchObjRecs ) }); /* var pagingBar = new Ext.PagingToolbar({ pageSize: rowLimit_1, store: searchObjStore, displayInfo: true, displayMsg: '总数: {2}', emptyMsg: '没有数据' }); */ var searchObjGrid = new Ext.grid.GridPanel({ id: 'searchObjGridId', store: searchObjStore, height : 202 , autoScroll : true , cm: new Ext.grid.ColumnModel([ searchObjSm, {header: "编号", width: 100, dataIndex: 'formSortUuid', sortable: true,hidden: true}, {header: "名称", width: 105, dataIndex: 'sortName', sortable: true} , {header: "描述", width: 105, dataIndex: 'description', sortable: true} ]), tbar : [ { text :'添加', handler : this.createRecord.createDelegate(this) },'-',{ text :'修改', handler : this.updateRecord.createDelegate(this) },'-',{ text :'删除', handler : this.delteRecord.createDelegate(this) } ] , frame: false, loadMask:{msg:"数据加载中...."}, sm:searchObjSm }); return searchObjGrid ; } , //新建 createRecord : function(){ this.getWindow().show(); this.getWindow().setTitle('新建表单类别'); this.getForm().baseParams = { create : true } ; } , //修改 updateRecord : function(){ var r = this.getGridSeleted(); if(r){ this.getWindow().show(); this.getWindow().setTitle('修改表单类别'); this.getForm().baseParams = { create : false } ; this.getForm().loadRecord(r); } } , //删除记录 delteRecord: function(){ var sort = this.protectId ? this.protectId : 'temp' ; var rec = this.getGridSeleted(); if(rec){ Ext.Msg.confirm('提示','确认删除<b>'+rec.get('sortName')+'</b>吗？',function(btn){ if(btn == 'yes'){ if(rec.get('formSortUuid') == sort){ Ext.Msg.alert('提示','<b>'+rec.get('sortName')+'</b>是系统默认类别不能删除！'); }else{ Ext.Ajax.request({ url : this.contextPath+'/formsort.do?method=delFormSort', params : {sortId : rec.get('formSortUuid')} , scope : this , callback :function(options ,success ,response ){ if(success){ var text = response.responseText ; if(text == '1'){ Ext.Msg.alert('提示','删除成功！',function(btn){ if(btn == 'ok'){ this.grid.getSelectionModel().clearSelections(); this.grid.getStore().reload(); } },this); }else if(text == '2'){ Ext.Msg.alert('提示','<b>'+rec.get('sortName')+'</b>已经被业务对象使用不能进行删除！'); }else{ Ext.Msg.alert('提示','删除数据失败！'); } }else{ Ext.Msg.alert('提示','删除数据失败！'); } } }); } } },this) } }, createForm : function(){ var form = new Ext.form.FormPanel({ frame : true , defaultType : 'textfield' , buttonAlign : 'center' , labelAlign : 'right' , labelWidth : 70 , items : [ { fieldLabel : 'id' , xtype : 'hidden', name : 'formSortUuid' }, { fieldLabel : '名称' , name : 'sortName' },{ fieldLabel : '描述' , xtype : 'textarea' , name : 'description' } ] , buttons : [ { text : '确定' , scope : this , handler : function(){ form.getForm().submit({ url: this.contextPath+'/formsort.do?method=saveOrUpdateFormSort', waitTitle : '请等待' , waitMsg: '正在提交中', scope : this , success:function(form,action){ this.getForm().reset(); this.grid.getSelectionModel().clearSelections(); this.grid.getStore().reload(); this.getWindow().hide(); }, failure:function(form,action){ Ext.Msg.alert('提示','保存失败！'); } }); } } , { text : '取消' , scope : this , handler : function(){ this.getForm().reset(); this.getWindow().hide(); } } ] }); return form ; } , getForm : function(){ var form = this.getFormPanel().getForm(); return form ; } , getFormPanel : function(){ if(!this.gridForm){ this.gridForm = this.createForm(); } return this.gridForm ; } , createWindow : function(){ var form = this.getFormPanel(); var win = new Ext.Window({ title : 'info' , closeAction : 'hide' , width : 300 , height : 180 , modal : true , items : }); return win ; }, getWindow : function(){ if(!this.gridWindow){ this.gridWindow = this.createWindow(); } return this.gridWindow ; } , //取到grid选择的记录 getGridSeleted : function(){ var sm = this.grid.getSelectionModel(); if(sm.hasSelection()){ return sm.getSelected() ; }else{ Ext.Msg.alert('提示','请选择一条记录！'); return null ; } } })
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