为datagrid、treegrid增加右键表头菜单，用于显示或隐藏列，注意：冻结列不在此菜单中

 1 var createGridHeaderContextMenu = function(e, field) {
 2     e.preventDefault();
 3     var grid = $(this);/* grid本身 */
 4     var headerContextMenu = this.headerContextMenu;/* grid上的列头菜单对象 */
 5     if (!headerContextMenu) {
 6         var tmenu = $('<div style="100px;"></div>').appendTo('body');
 7         var fields = grid.datagrid('getColumnFields');
 8         console.log('id='+grid.attr('id'));
 9          storage=$.localStorage;if(!storage)storage=$.cookieStorage;
10         var cols = storage.get(grid.attr('id')+'hiddenColumns');
11         var init=true;
12         if(cols){
13             init=false;
14         }
15         for ( var i = 0; i < fields.length; i++) {
16             var fildOption = grid.datagrid('getColumnOption', fields[i]);
17             console.log(fields[i]+'='+fildOption.hidden);
18             if (!fildOption.hidden||fildOption.hidden==false) {
19                 $('<div iconCls="icon-ok" field="' + fields[i] + '"/>').html(fildOption.title).appendTo(tmenu);
20             } else {
21                 if(init==false){
22                     for(var j=0;j<cols.length;j++){
23                         if(cols[j].field==fields[i]&&cols[j].visible!=false){
24                             //console.log(cols[j].field+'=='+cols[j].visible);
25                             $('<div iconCls="icon-empty" field="' + fields[i] + '"/>').html(fildOption.title).appendTo(tmenu);
26                         }
27                     }
28                 }
29             }
30         }
31         headerContextMenu = this.headerContextMenu = tmenu.menu({
32             onClick : function(item) {
33                 var field = $(item.target).attr('field');
34                 if (item.iconCls == 'icon-ok') {
35                     grid.datagrid('hideColumn', field);
36                     $(this).menu('setIcon', {
37                         target : item.target,
38                         iconCls : 'icon-empty'
39                     });
40                 } else if (item.iconCls == 'icon-empty') {
41                     grid.datagrid('showColumn', field);
42                     $(this).menu('setIcon', {
43                         target : item.target,
44                         iconCls : 'icon-ok'
45                     });
46                 }else{
47                     //恢复表头
48                     
49                 }
50             }
51         });
52     }
53     headerContextMenu.menu('show', {
54         left : e.pageX,
55         top : e.pageY
56     });
57 };
58 
59 //$.fn.datagrid.defaults.onHeaderContextMenu = createGridHeaderContextMenu;     //屏蔽掉dagagrid表头右键隐藏列的功能
60 $.fn.treegrid.defaults.onHeaderContextMenu = createGridHeaderContextMenu;