dojo中 的 grid 的改进:增加分页导航条

http://walle1027.iteye.com/blog/945607

dojo.provide("navigationGrid");  
  
dojo.require("dojox.grid.DataGrid");  
dojo.require('dijit.Toolbar');  
dojo.require("dijit.form.Button");  
dojo.require("dijit.ToolbarSeparator");  
dojo.declare("navigationGrid",dojox.grid.DataGrid,{  
    // 当前页码号  
    currentPage:1,totalPage:1,maxPageNum:5,// 页码按钮  
    _pageBtns:null,// 导航条对象  
    _naviBar:null,_firstBtn:null,_prviousBtn:null,_nextBtn:null,_lastBtn:null,_pageLoaded:false,postCreate: function(){  
        this.inherited(arguments);  
        this._pageBtns = [];  
        this._naviBar = new dijit.Toolbar(  
        {  
            style:"width:100%;text-align:right"  
        });  
        this._firstBtn = new dijit.form.Button({  
            label:"首页",disabled:true,iconClass:"navi-first",onClick:dojo.hitch(this,"_locate",'first')  
        });  
        this._prviousBtn = new dijit.form.Button({  
            label:"上一页",iconClass:"navi-previous",'pre')  
        });  
        this._nextBtn = new dijit.form.Button({  
            label:"下一页",dir:"rtl",iconClass:"navi-next",'next')  
            });  
        this._lastBtn = new dijit.form.Button({  
            label:"末页",iconClass:"navi-last",'last')  
        });  
        this._naviBar.addChild(this._firstBtn);  
        this._naviBar.addChild(new dijit.ToolbarSeparator());  
        this._naviBar.addChild(this._prviousBtn);  
        this._naviBar.addChild(new dijit.ToolbarSeparator());  
        this._naviBar.addChild(this._nextBtn);  
        this._naviBar.addChild(new dijit.ToolbarSeparator());  
        this._naviBar.addChild(this._lastBtn);  
        this._naviBar.placeAt(this.domNode,"after");  
        // this._naviBar.startup();  
    },_locate:function(s){  
        switch(s){  
            case 'first':  
                this._navigate(1);  
                break;  
            case 'pre':  
                this._navigate(this.currentPage - 1);  
                break;  
            case 'next':  
                this._navigate(this.currentPage + 1);  
                break;  
            case 'last':  
                this._navigate(this.totalPage);  
                break;  
            default:  
                break;  
        }  
    },_updateBtnStatus:function(pageNo){  
        /* 
         * 更新按钮的状态和样式 
         */  
        if(pageNo > 1){  
            this._firstBtn.set('disabled',false);  
            this._prviousBtn.set('disabled',false);  
        }else{  
            this._firstBtn.set('disabled',true);  
            this._prviousBtn.set('disabled',true);  
        }  
        if(pageNo < this.totalPage){  
            this._nextBtn.set('disabled',false);  
            this._lastBtn.set('disabled',false);  
        }else{  
            this._nextBtn.set('disabled',true);  
            this._lastBtn.set('disabled',true);  
        }  
          
        // 清除当前页的样式  
        /*var currentPageIdx = (this.maxPageNum?this.currentPage%this.maxPageNum:this.maxPageNum) - 1; 
        var pageNoIdx = (this.maxPageNum?pageNo%this.maxPageNum:this.maxPageNum) -1; 
        pageNoIdx = pageNoIdx < 0?this.maxPageNum -1 :pageNoIdx; 
        if(this._pageBtns[currentPageIdx]){ 
            this._pageBtns[currentPageIdx].set('class',''); 
        } 
        if(this._pageBtns[pageNoIdx]){ 
            this._pageBtns[pageNoIdx].set('class','navi-currentPage'); 
        }*/  
    },/** 
     * 重新载入当前页面 
    */  
    reload:function(){  
        var row = this._pageToRow(this.currentPage - 1);  
        this._fetch(row,true);  
    },/* 
     * 指向导航页面 
     */  
    _navigate:function(pageNo){  
        if(this.currentPage==pageNo){return}  
        if(pageNo < 1 || pageNo > this.totalPage){return}  
        this._updateBtnStatus(pageNo);  
        var row = this._pageToRow(pageNo - 1);  
        this.currentPage = pageNo;  
        //this._clearData();  
        this._fetch(row,_onFetchComplete:function(items,req){  
        if(!this.scroller){ return; }  
        if(items && items.length > 0){  
            // console.log(items);  
            /*for(var i=0;i<this.rowsPerPage;i++){ 
                if(items.length > i){ 
                    this._addItem(items[i],i,true); 
                }else{ 
                    this._addItem({},true); 
                } 
            }*/  
            dojo.forEach(items,function(item,idx){  
                this._addItem(item,idx,true);  
            },this);  
              
            if(this._autoHeight){  
                this._skipRowRenormalize = true;  
            }  
            this.updateRowCount(items.length);  
            this.updateRows(0,items.length);  
            if(this._autoHeight){  
                this._skipRowRenormalize = false;  
            }             
            if(req.isRender){  
                this.setScrollTop(0);  
                this.postrender();  
            }else if(this._lastScrollTop){  
                this.setScrollTop(this._lastScrollTop);  
            }  
        }  
        delete this._lastScrollTop;  
        if(!this._isLoaded){  
            this._isLoading = false;  
            this._isLoaded = true;  
        }  
        this._pending_requests[req.start] = false;  
    },// 重写父类的方法，初始化导航数字按钮  
    _onFetchBegin:function(size,req){  
        this._updateButtons(size);  
        if(!size){  
            this.views.render();  
            this._resize();  
            this.showMessage(this.noDataMessage);  
            this.focus.initFocusView();  
            return;  
        }else{  
            this.showMessage();  
        }  
          
        if(!this.scroller){ return; }  
        if(this.rowCount != this.rowsPerPage){  
            if(req.isRender){  
                this.scroller.init(this.rowsPerPage,this.rowsPerPage,this.rowsPerPage);  
                this.rowCount = this.rowsPerPage;  
                this._setAutoHeightAttr(this.autoHeight,true);  
                this._skipRowRenormalize = true;  
                this.prerender();  
                this._skipRowRenormalize = false;  
            }else{  
                this.updateRowCount(this.rowsPerPage);  
            }  
        }  
    },_clearData: function(){  
        this.inherited(arguments);  
        this.currentPage=1;  
        this.totalPage=1;  
        dojo.forEach(this._pageBtns,function(btn){  
            btn.destroy();  
        })  
        this._pageBtns=[];  
        if(this._firstBtn){  
            this._firstBtn.set('disabled',false);  
        }  
        if(this._prviousBtn){  
            this._prviousBtn.set('disabled',false);  
        }  
        if(this._nextBtn){  
            this._nextBtn.set('disabled',false);  
        }  
        if(this._lastBtn){  
            this._lastBtn.set('disabled',false);  
        }  
        this._pageLoaded=false;  
    },_updateButtons:function(size){  
        //TODO 先销毁按钮组  
        if(this._pageBtns){  
            dojo.forEach(this._pageBtns,function(element){  
                element.destroy();  
            })  
            this._pageBtns = [];  
        }  
        // 初始化数字按钮条  
        var totalPage = (this.rowsPerPage ? Math.ceil(size / this.rowsPerPage) : size);  
        var isShow = false;  
        var isFirstRightDot = false;  
        var isFirstLefttDot = false;  
        var beginIndex = 4;  
        for (var i = 1; i <= totalPage; i++){  
            if (i == 1 || i == 2 || i == totalPage || i == totalPage - 1  
                    || i == this.currentPage - 1 || i == this.currentPage - 2  
                    || i == this.currentPage + 1 || i == this.currentPage + 2) {  
                isShow = true;  
            }  
            if (this.currentPage == i) {  
                var numBtn = new dijit.form.Button({  
                    label:i,baseClass:"",tooltip:"第"+i+"页",style:{border:"1px solid #A8AAE2",margin:"1px"},cssStateNodes: {"titleNode":"navi"},"_navigate",i)  
                });  
                this._pageBtns.push(numBtn);  
                numBtn.set('disabled',true);  
                dojo.addClass(numBtn.domNode,'navi-selected');  
                this._naviBar.addChild(numBtn,beginIndex);  
                beginIndex++;  
            } else {  
                if (isShow == true) {  
                    var numBtn = new dijit.form.Button({  
                        label:i,i)  
                    });  
                    this._pageBtns.push(numBtn);  
                    this._naviBar.addChild(numBtn,beginIndex);  
                    beginIndex++;  
                } else {  
                    if (isFirstLefttDot == false && i == this.currentPage - 3) {  
                        var numBtn = new dijit.form.Button({  
                            label:'...',disabled:true  
                        });  
                        this._pageBtns.push(numBtn);  
                        this._naviBar.addChild(numBtn,beginIndex);  
                        beginIndex++;  
                        isFirstLefttDot = true;  
                    }  
                    if (isFirstRightDot == false && i > this.currentPage) {  
                        var numBtn = new dijit.form.Button({  
                            label:'...',beginIndex);  
                        beginIndex++;  
                        isFirstRightDot = true;  
                    }  
                }  
            }  
            isShow = false;  
        }  
                /*var numBtn = new dijit.form.Button({ 
                    label:i+1,tooltip:"第"+(i+1)+"页",i+1) 
                }); 
                this._pageBtns.push(numBtn); 
                this._naviBar.addChild(numBtn,i+4); 
            } 
            this._naviBar.addChild(new dijit.form.Button({label:"...",disabled:true}),btnsNum+3); 
            var lasBtn = new dijit.form.Button({ 
                label:totalPage,tooltip:"第"+(totalPage)+"页",totalPage) 
            }) 
            this._pageBtns.push(lasBtn); 
            this._naviBar.addChild(lasBtn,btnsNum+4); 
             
            */  
        this.totalPage = totalPage;  
        // 设置按钮的状态  
        this._updateBtnStatus(this.currentPage);  
        //this._pageLoaded = true;  
    }  
});  

（编辑：李大同）

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