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模拟windows平台的上下文菜单效果代码

　　发布时间：2024-08-31 04:26:11　

标签：上下文,菜单

代码演示：

<!DOCTYPE html> <html> <head> <meta charset="utf-8" /> <title>无标题文档</title> <style> </style> <script type="text/javascript"> //<![CDATA[ function $(id) { return document.getElementById(id); }; var EventUnit = { addHandler: function(element, type, handler) {//添加事件处理程序 if(element.addEventListener) { element.addEventListener(type, handler, false); } else if(element.attachEvent) { element.attachEvent('on' + type, handler); } else { element['on' + type] = handler; }; }, getEvent: function(event) { return event ? event : window.event; }, preventDefault: function(event) {//取消事件默认动作 if(event.preventDefault) { event.preventDefault(); } else { event.returnValue = false; }; } } EventUnit.addHandler(window, 'load', function() { var wrap = $('wrap'); var menu = $('menu'); var menuStyle = menu.style.display; var x = wrap.offsetLeft + wrap.clientWidth, y = wrap.offsetTop + wrap.clientHeight; var w = 0, h = 0; var left = 0, top = 0; EventUnit.addHandler(wrap, 'contextmenu', function(event) { event = EventUnit.getEvent(event); EventUnit.preventDefault(event); menu.style.display = 'block'; w = menu.clientWidth; h = menu.clientHeight; left = (x - event.clientX >= w) ? event.clientX - wrap.offsetLeft : event.clientX - wrap.offsetLeft - w; top = (event.clientY + h <= y) ? event.clientY - wrap.offsetTop : event.clientY - wrap.offsetTop - h; menu.style.left = left + 'px'; menu.style.top = top + 'px'; }); EventUnit.addHandler(document, 'click', function() { menu.style.display = menuStyle; }); }); //]]> </script> </head> <body> <div id="wrap"> <p>单击右键看效果~</p> <ul id="menu"> <li>撤销</li> <li>重做</li> <li>复制</li> <li>粘贴</li> <li>大小写转换</li> <li>回车</li> <li>拼写检查</li> <li>新建</li> <li>自定义</li> <li>图形选项</li> <li class="no">关闭</li> </ul> </div> </body> </html>

结构：

<div id="wrap">
<ul id="menu">
<li><a href="">撤销</a></li>
<li><a href="">重做</a></li>
<li><a href="">复制</a></li>
<li><a href="">粘贴</a></li>
<li><a href="">大小写转换</a></li>
<li><a href="">回车</a></li>
<li><a href="">拼写检查</a></li>
<li><a href="">新建</a></li>
<li><a href="">自定义</a></li>
<li><a href="">图形选项</a></li>
<li class="no"><a href="">关闭</a></li>
</ul>
</div>

code是这样：

function $(id) {
return document.getElementById(id);
};

var EventUnit = {
addHandler: function(element, type, handler) {//添加事件处理程序
if(element.addEventListener) {
element.addEventListener(type, handler, false);
} else if(element.attachEvent) {
element.attachEvent('on' + type, handler);
} else {
element['on' + type] = handler;
};
},
getEvent: function(event) {
return event ? event : window.event;
},
preventDefault: function(event) {//取消事件默认动作
if(event.preventDefault) {
event.preventDefault();
} else {
event.returnValue = false;
};
}
}

EventUnit.addHandler(window, 'load', function() {
var wrap = $('wrap');
var menu = $('menu');
var menuStyle = menu.style.display;
var x = wrap.offsetLeft + wrap.clientWidth, y = wrap.offsetTop + wrap.clientHeight;
var w = 0, h = 0;
var left = 0, top = 0;

EventUnit.addHandler(wrap, 'contextmenu', function(event) {
event = EventUnit.getEvent(event);
EventUnit.preventDefault(event);

menu.style.display = 'block';
w = menu.clientWidth;
h = menu.clientHeight;
left = (x - event.clientX >= w) ? event.clientX - wrap.offsetLeft : event.clientX - wrap.offsetLeft - w;
top = (event.clientY + h <= y) ? event.clientY - wrap.offsetTop : event.clientY - wrap.offsetTop - h;
menu.style.left = left + 'px';
menu.style.top = top + 'px';
});

EventUnit.addHandler(document, 'click', function() {
menu.style.display = menuStyle;
});
});

投稿

模拟windows平台的上下文菜单效果代码

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