本文分享一个基于 JavaScript 实现的简单右键菜单类，用于屏蔽浏览器默认右键菜单。该类包含触发元素 ID、菜单容器 ID、菜单项列表及样式类名四个参数，支持鼠标悬停效果。文章提供了完整代码示例及在线演示地址，便于开发者参考集成。
JavaScript 自定义右键菜单类介绍
本文通过一个具体的实例，介绍如何使用 JavaScript 编写一个简单的右键菜单类。该示例代码可供读者参考学习。
这是一个自定义编写的右键菜单类，主要功能是屏蔽 Internet Explorer 浏览器默认的右键菜单。该类初始化时接收四个参数：第一个参数指定触发显示右键菜单的 DOM 元素的 ID。
第二个参数指定右键菜单容器的 ID，程序会根据此 ID 动态创建一个新的层。menuList 参数用于定义菜单项列表，对应点击各个菜单项后需要触发的回调函数。classList 参数用于定义菜单整体及菜单项的 CSS 类名，其中包括鼠标悬停时高亮显示的类名。
运行效果截图如下：
在线演示地址如下：
http://demo.jb51.net/js/2015/js-right-button-menu-class-codes/
具体代码如下：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>右键菜单</title>
<style type="text/css">
.cmenu
{
position:absolute;
top:100px;
left:100px;
width:200px;
height:200px;
background-color:white;
border:1px solid pink;
}
.liAble
{
font-family:"宋体";
color:#6699CC;
margin-left:10px;
margin-top:5px;
list-style-type:none;
cursor:default;
}
.liMouseOver
{
margin-left:10px;
margin-top:5px;
background-color:#CCFFFF;
list-style-type:none;
cursor:default;
}
</style>
</head>
<body>
<div style="margin-left:auto; margin-right:auto; height:300px; width:60%;background-color:#CC6699" id="x">
</div>
<input type="hidden" id="value1" value="4" />
<input type="hidden" id="value2" value="5" />
<script type="text/javascript">
//右键菜单类
function RightHandMenu(div,menuDiv,menuList,classList)
{
var oThis = this;
this._menuList =
{
}
this._classList =
{
objClass:'',
MenuClass:'',
liAbleClass:'',
liMouseOverClass:''
}
this.Init = function()
{
this._obj = $(div);
this._obj.oncontextmenu = function(e){oThis.ShowMenu(e)};
this._obj.className = this._classList.objClass;
document.onclick = function(){oThis.HiddenMenu()};
objToObj(this._classList, classList);
objToObj(this._menuList, menuList);
}
this.CreateMenu = function()
{
if($(menuDiv))
{
alert("该ID已被占用");
return;
}
this._menu = document.createElement("DIV");
this._menu.id = menuDiv;
this._menu.oncontextmenu = function(e){stopBubble(e)};
this._menu.className = this._classList.MenuClass;
this._menu.style.display = "none";
document.body.appendChild(this._menu);
}
this.CreateMenuList = function()
{
for(var pro in this._menuList)
{
var li = document.createElement("LI");
li.innerHTML = pro;
this._menu.appendChild(li);
li.className = this._classList.liAbleClass;
li.onclick = this._menuList[pro];
li.onmouseover = function(){oThis.ChangeLiClass(this,oThis._classList.liMouseOverClass)}
li.onmouseout = function(){oThis.ChangeLiClass(this,oThis._classList.liAbleClass)}
}
}
this.ChangeLiClass = function(obj,name)
{
obj.className = name
}
this.ShowMenu = function(e)
{
var e = e || window.event;
stopBubble(e);
var offsetX = e.clientX;
var offsetY = e.clientY;
with(this._menu.style)
{
display = "block";
top = offsetY + "px";
left = offsetX + "px";
}
}
this.HiddenMenu = function()
{
this._menu.style.display = "none";
}
this.Init();
this.CreateMenu();
this.CreateMenuList();
}
function stopBubble(oEvent)
{
if(oEvent.stopPropagation) oEvent.stopPropagation();
else oEvent.cancelBubble = true;
if(oEvent.preventDefault) oEvent.preventDefault();
else oEvent.returnValue = false;
}
function $(div)
{
return 'string' == typeof div ? document.getElementById(div) : div;
}
function objToObj(destination,source)
{
for(var pro in source)
{
destination[pro] = source[pro];
}
return destination;
}
//构造右键菜单
function Edit()
{
alert("edit");
}
function Delete()
{
alert("delete");
}
var menuList =
{
编辑:Edit,
删除:Delete
}
var classList =
{
MenuClass:'cmenu',
liAbleClass:'liAble',
liMouseOverClass:'liMouseOver'
}
var x = new RightHandMenu("x","testDiv",menuList,classList)
</script>
</body>
</html>希望本文所述内容对大家的 JavaScript 程序设计有所帮助。