js实现自定义右键菜单--兼容IE、Firefox、Chrome

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

    <title>javascript右键菜单</title>

    <meta http-equiv="content-type" content="text/html; charset=utf-8">

    <style>

        .DreamMenu

        {

            position: absolute;

            visibility: hidden;

            z-index: 100;

            overflow: hidden;

            width: 150px;

            background-color: buttonface;

            border: dimgray 1px solid !important;

            border: buttonhighlight menu menu buttonhighlight 2px outset;

            padding: 1px !important;

            padding: 1px 1px 1px 0px;

            font-size: 12px;

        }

        .DreamMenu ul

        {

            margin: 1px;

            border-bottom: buttonhighlight 1px solid;

            border-top: buttonshadow 1px solid;

        }

        .DreamMenu a

        {

            display: block;

            width: 100%;

            padding: 1px 2px 2px 20px;

            cursor: default;

            text-decoration: none;

            color: #000000;

        }

        .DreamMenu a:hover

        {

            background: highlight;

            color: #ffffff;

        }

    </style>

</head>

<body menu='menu'>

    <!---这段js最好写进文件方便用，为了在51能运行就直接写进来了--->

    <script>

        /***

        DreamCore - JsLib/Menu

        Date : Dec 03, 2006

        Copyright: DreamSoft Co.,Ltd.

        Mail : Dream@Dreamsoft.Ca

        Author : Egmax

        Browser : IE5.0&+,Firefox1.5&+,Netscape7.0&+

        Update:

        ***/

        if (!document.all) document.captureEvents(Event.MOUSEDOWN);

        var _Tmenu = 0;

        var _Amenu = 0;

        var _Type = 'A';

        var _Menu = "null";

        document.onclick = _Hidden;

        function _Hidden() {

            if (_Tmenu == 0) return;

            document.getElementById(_Tmenu).style.visibility = 'hidden';

            _Tmenu = 0;

        }

        document.oncontextmenu = function (e) {

            _Hidden();

            var _Obj = document.all ? event.srcElement : e.target;

            if (_Type.indexOf(_Obj.tagName) == -1) return;

            _Amenu = _Obj.getAttribute('menu');

            if (_Amenu == 'null') return;

            if (document.all) e = event;

            _ShowMenu(_Amenu, e);

            return false;

        }

        function _ShowMenu(Eid, event) {

            _Menu = document.getElementById(Eid);

            var _Left = event.clientX + document.body.scrollLeft;

            var _Top = event.clientY + document.body.scrollTop;

            _Menu.style.left = _Left.toString() + 'px';

            _Menu.style.top = _Top.toString() + 'px';

            _Menu.style.visibility = 'visible';

            _Tmenu = Eid;

            _Menu.onclick = transfer;

            _Menu.oncontextmenu = no_context_menu;

        }

        function transfer(e) {

            e = e || window.event; e.cancelBubble = true;

        }

        function no_context_menu(e) {

            e = e || window.event;

            e = e || window.event; e.cancelBubble = true;

            return;

        }

        /***

        可以支持其他标签INPUT,IMG

        ***/

    </script>

    <script>        _Type = 'INPUT,A,DIV,BODY,IMG';</script>

    <!-----设置一个菜单层---->

    <div id="menu" class='DreamMenu'>

        <a href='javascript:;'>您好</a> <a href='javascript:;'>我是主菜单</a> <a href='javascript:;'>

            在页面上单击</a> <a href='javascript:;'>就可以看到我</a>

        <ul>

        </ul>

        <a href='javascript:;'>打印</a>

    </div>

    <!-----设置一个菜单层---->

    <div id="menu2" class='DreamMenu'>

        <a href='javascript:;'>哈哈</a> <a href='javascript:;'>我是个链接</a> <a href='javascript:;'>

            好开心啊</a> <a href='javascript:;'>查看</a>

        <ul>

        </ul>

        <a href='javascript:;'>打印</a>

    </div>

    <!-----设置一个菜单层---->

    <div id="menu3" class='DreamMenu'>

        <a href='javascript:;'>哈哈</a> <a href='javascript:;'>我是图片</a> <a href='javascript:;'>

            虽然打不开</a> <a href='javascript:;'>查看</a>

        <ul>

        </ul>

        <a href='javascript:;'>打印</a>

    </div>

    <table>

        <tr>

            <td height="100">

                <!-----设置一个菜单menu属性---->

                <a href='javascript:;' menu='menu2'>菜单1</a> <a href='javascript:;' menu='menu2'>菜单2</a>

            </td>

        </tr>

    </table>

    <div style='height: 300;' menu='menu'>

    </div>

    <img src='qiougou.gif' menu='menu3' />

</body>

</html>

经过上面的改编：

if (!document.all) document.captureEvents(Event.MOUSEDOWN);

var _Tmenu = 0;

var _Amenu = 0;

var _Type = 'DIV';

document.onclick = _Hidden;

function _Hidden() {

    if (_Tmenu || _Tmenu == null || _Tmenu == 0) return;

    document.getElementById(_Tmenu).style.visibility = 'hidden';

    _Tmenu = 0;

}

document.oncontextmenu = function (e) {

    _Hidden();

    var _Obj = document.all ? event.srcElement : e.target;

    if (_Type.indexOf(_Obj.tagName) == -1) return;

    _Amenu = _Obj.getAttribute('menu');

    if (_Amenu || _Amenu == null || _Amenu == 'null') return;

    if (document.all) e = event;

    _ShowMenu(_Amenu, e);

    return false;

}

function _ShowMenu(Eid, event, type) {

    var _Menu = document.getElementById(Eid);

    var _Left = event.clientX + document.body.scrollLeft;

    var _Top = event.clientY + document.body.scrollTop;

    var _menuOffsetHeight = parseInt(_Menu.offsetHeight);

    if (parseInt(document.body.clientHeight) - parseInt(_Top) < _menuOffsetHeight) {//

        _Top = _Top - _menuOffsetHeight;

        _Menu.style.left = _Left.toString() + 'px';

        _Menu.style.top = _Top.toString() + 'px';

        _Menu.style.visibility = 'visible';

        _Tmenu = Eid;

    }

    else {

        _Menu.style.left = _Left.toString() + 'px';

        _Menu.style.top = _Top.toString() + 'px';

        _Menu.style.visibility = 'visible';

        _Tmenu = Eid;

    }

}