为easyui的datagrid、treegrid增加表头菜单，用于显示或隐藏列

/** * @author 孙宇 *  * @requires jQuery,EasyUI *  * 为datagrid、treegrid增加表头菜单，用于显示或隐藏列，注意：冻结列不在此菜单中 */var createGridHeaderContextMenu = function(e, field) {e.preventDefault();var grid = $(this);/* grid本身 */var headerContextMenu = this.headerContextMenu;/* grid上的列头菜单对象 */if (!headerContextMenu) {var tmenu = $('<div style="width:100px;"></div>').appendTo('body');var fields = grid.datagrid('getColumnFields');for ( var i = 0; i < fields.length; i++) {var fildOption = grid.datagrid('getColumnOption', fields[i]);if (!fildOption.hidden) {$('<div iconCls="icon-ok" field="' + fields[i] + '"/>').html(fildOption.title).appendTo(tmenu);} else {$('<div iconCls="icon-empty" field="' + fields[i] + '"/>').html(fildOption.title).appendTo(tmenu);}}headerContextMenu = this.headerContextMenu = tmenu.menu({onClick : function(item) {var field = $(item.target).attr('field');if (item.iconCls == 'icon-ok') {grid.datagrid('hideColumn', field);$(this).menu('setIcon', {target : item.target,iconCls : 'icon-empty'});} else {grid.datagrid('showColumn', field);$(this).menu('setIcon', {target : item.target,iconCls : 'icon-ok'});}}});}headerContextMenu.menu('show', {left : e.pageX,top : e.pageY});};$.fn.datagrid.defaults.onHeaderContextMenu = createGridHeaderContextMenu;$.fn.treegrid.defaults.onHeaderContextMenu = createGridHeaderContextMenu;