Javascript:鼠标事件(转贴)_elmenuitem 添加鼠标焦点事件-优快云博客

该博客展示了如何使用JavaScript和HTML实现自定义上下文菜单。通过设置菜单背景样式，编写弹出菜单、高亮显示、点击触发事件等函数，还介绍了不同条件下显示或抑制上下文菜单的方法，如按Ctrl键显示默认菜单、右键点击显示自定义菜单等。

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<TITLE>oncontextmenu Event Sample</TITLE>
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function displayMenu() {
   whichDiv=event.srcElement;
   menu1.style.leftPos+=10;
   menu1.style.posLeft=event.clientX;
   menu1.style.posTop=event.clientY;
   menu1.style.display="";
   menu1.setCapture();
}

function switchMenu() {
   el=event.srcElement;
   if (el.className=="menuItem") {
      el.className="highlightItem";
   } else if (el.className=="highlightItem") {
      el.className="menuItem";
   }
}

function clickMenu() {
   menu1.releaseCapture();
   menu1.style.display="none";　　　　//点击后隐藏菜单
   el=event.srcElement;
   if (el.id=="mnuRed") {
      whichDiv.style.backgroundColor="red";
   } else if (el.id=="mnuGreen") {　　　　　　　　　　
      whichDiv.style.backgroundColor="green";   　　//选择Green时背景变为绿色
   } else if (el.id=="mnuBlue") {
      whichDiv.style.backgroundColor="blue";          //选择blue时背景变为蓝色
   } else if (el.id=="mnuYellow") {
      whichDiv.style.backgroundColor="yellow";       //选择yellow时背景变为黄色

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<H1>oncontextmenu Event Sample</H1>
<P>This sample shows how to use the <B>oncontextmenu</B> event handler, available in Microsoft® Internet Explorer 5 and later, to display both standard and custom context menus and prevent context menus from displaying. Experiment with each of the following boxes to see how you can apply different methods either to display or to inhibit context menus. Each box provides instructions for you to follow.
</P>

<SPAN class="clickableSpan">
1. The default context menu always displays when you right-click in this box.
<b><br>Code: </b>
//no code necessary
</SPAN><br><br>

<SPAN class="clickableSpan" oncontextmenu="return event.ctrlKey">
2. The default context menu displays only if you right-click in this box while holding down the Ctrl key. This is useful for developing and debugging purposes.
<b><br>Code: </b>
oncontextmenu="return event.ctrlKey"
</SPAN><br><br>

<SPAN class="clickableSpan" oncontextmenu="return false">
3. A context menu never displays when you right-click in this box.
<b><br>Code: </b>
oncontextmenu="return false"
</SPAN><br><br>

<SPAN class="clickableSpan" oncontextmenu="displayMenu();return false">
4. A custom context menu displays when you right-click in this box.
<b><br>Code: </b>
oncontextmenu="showMenu();return false;"
</SPAN><br><br>

<SPAN class="clickableSpan" oncontextmenu="if (!event.ctrlKey){displayMenu();return false;}">
5. A custom menu displays when you right-click in this box. If you right-click while holding down the Ctrl key, the default context menu displays.
<b><br>Code: </b>
oncontextmenu="if (!event.ctrlKey){displayMenu();return false;}"
</SPAN><br>

<div id=menu1 onclick="clickMenu()" onmouseover="switchMenu()" onmouseout="switchMenu()" style="position:absolute;display:none;width:100;background-Color:menu; border: outset 3px gray">
<div class="menuItem" id=mnuRed>Red</div>
<div class="menuItem" id=mnuGreen>Green</div>
<div class="menuItem" id=mnuBlue>Blue</div>
<div class="menuItem" id=mnuYellow>Yellow</div>
</div>

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