easyui datagrid 行右键 动态获取并生成toolbar 按钮

var createGridRowContextMenu = function(e, rowIndex, rowData) {
    e.preventDefault();
    var grid = $(this);/* grid本身 */
    var rowContextMenu = this.rowContextMenu;/* grid上的列头菜单对象 */
    grid.datagrid('unselectAll').datagrid('selectRow', rowIndex);
    if (!rowContextMenu) {
        var tmenu = $('<div style="100px;"></div>').appendTo('body');
        var toolbar = grid.datagrid('getToolbar');
        var filedHTML = $('<div iconCls="icon-columns"></div>');
        var span = $('<span>翻页控制</span>');
        var spdiv = $('<div></div>');
        for ( var i = 0; i < toolbar.length; i++) {
            var btn = $(toolbar[i]).linkbutton('options');
            var btnElement = $(toolbar[i]).linkbutton();
            var c = $(btnElement).attr("onclick");
            $("<div data-options=iconCls:'"+btn.iconCls+"',disabled:"+btn.disabled+" fire='" + c + "',/>").html(btn.text).appendTo(tmenu);
            //$('<div data-options=iconCls:"'+btn.iconCls+'",onclick:'+$(btnElement).attr("onclick")+',disabled:'+btn.disabled+'/>').html(btn.text).appendTo(tmenu);
        }
        spdiv.append('<div iconCls="pagination-first">首页</div>');
        spdiv.append('<div iconCls="pagination-prev">上一页</div>');
        spdiv.append('<div iconCls="pagination-next">下一页</div>');
        spdiv.append('<div iconCls="pagination-last">末页</div>');
        span.appendTo(filedHTML);
        spdiv.appendTo(filedHTML);
        filedHTML.appendTo(tmenu);
        rowContextMenu = this.rowContextMenu = tmenu.menu({
            onClick : function(item) {
                var fire = $(item.target).attr('fire');
                if(fire){
                    new Function(fire)();   //eval(fire);  eval 也是可行的;
                }
                var pager = grid.datagrid('getPager').pagination('options');    //拿到pager
                var pagination = $(item.target).attr('iconCls');
                var pageNum = 0
                var page = pager.total / pager.pageSize;    //总行书 / 每页显示行数 =  总页数
                page = Math.ceil(page)
                if(pagination == 'pagination-first'){
                    pageNum = 1;
                }
                if(pagination == 'pagination-prev'){
                    pageNum = pager.pageNumber - 1;
                }
                if(pagination == 'pagination-next'){
                    pageNum = pager.pageNumber + 1;
                }
                if(pagination == 'pagination-last'){
                    pageNum = page;
                }
                grid.datagrid('getPager').pagination('select',pageNum);
            }
        });
    }else{
        
    }
    rowContextMenu.menu('show', {
        left : e.pageX,
        top : e.pageY
    });
    var pager = grid.datagrid('getPager').pagination('options');    //拿到pager
    var itemFirst = rowContextMenu.menu('findItem','首页');
    var itemPrev = rowContextMenu.menu('findItem','上一页');
    var itemNext = rowContextMenu.menu('findItem','下一页');
    var itemLast = rowContextMenu.menu('findItem','末页');
    rowContextMenu.menu('disableItem',itemFirst.target);
    rowContextMenu.menu('disableItem',itemPrev.target);
    rowContextMenu.menu('disableItem',itemNext.target);
    rowContextMenu.menu('disableItem',itemLast.target);
    var page = pager.total / pager.pageSize;    //总行书 / 每页显示行数 =  总页数
    //if(page < 1){    //如果页数小于0  
    //那么页数 = 1 page = 1;    
    //}
    page = Math.ceil(page)
    if(page < 1)
        page=page+1;
    if(1 < pager.pageNumber && pager.pageNumber < page){
        rowContextMenu.menu('enableItem',itemFirst.target);
        rowContextMenu.menu('enableItem',itemPrev.target);
        rowContextMenu.menu('enableItem',itemNext.target);
        rowContextMenu.menu('enableItem',itemLast.target);
    }
    if(page == pager.pageNumber && pager.pageNumber != 1){
        rowContextMenu.menu('enableItem',itemFirst.target);
        rowContextMenu.menu('enableItem',itemPrev.target);
    }
    if(pager.pageNumber == 1 && page != 1){
        rowContextMenu.menu('enableItem',itemNext.target);
        rowContextMenu.menu('enableItem',itemLast.target);
    }
};
$.fn.datagrid.defaults.onRowContextMenu = createGridRowContextMenu;
$.fn.treegrid.defaults.onRowContextMenu = createGridRowContextMenu;