上下文菜单是指在用户交互（例如右键点击）时出现的菜单。 HTML5允许我们自定义此菜单。 这里有一些实现示例，包括嵌套菜单。
示例
HTML
<body contextmenu="share">
<menu type="context" id="share">
<menu label="share">
<menuitem label="Twitter" onclick="shareViaTwitter()"></menuitem>
<menuitem label="Facebook" onclick="shareViaFacebook()"></menuitem>
</menu>
</menu>
<ol>
<li>
Anywhere in the example you can share the page on Twitter and
Facebook using the Share menu from your context menu.
</li>
<li contextmenu="changeFont" id="fontSizing">
On this specific list element, you can change the size of the text
by using the "Increase/Decrease font" actions from your context menu
</li>
<menu type="context" id="changeFont">
<menuitem label="Increase Font" onclick="incFont()"></menuitem>
<menuitem label="Decrease Font" onclick="decFont()"></menuitem>
</menu>
<li contextmenu="ChangeImage" id="changeImage">
On the image below, you can fire the "Change Image" action
in your Context Menu.<br />
<img src="https://developer.mozilla.org/media/img/promote/promobutton_mdn5.png"
contextmenu="ChangeImage" id="promoButton" />
<menu type="context" id="ChangeImage">
<menuitem label="Change Image" onclick="changeImage()"></menuitem>
</menu>
</li>
</ol>
</body>
JavaScript
function shareViaTwitter() {
window.open("https://twitter.com/intent/tweet?text=" +
"Hurray! I am learning ContextMenu from MDN via Mozilla");
}
function shareViaFacebook() {
window.open("https://facebook.com/sharer/sharer.php?u=" +
"https://developer.mozilla.org/en/HTML/Element/Using_HTML_context_menus");
}
function incFont() {
document.getElementById("fontSizing").style.fontSize = "larger";
}
function decFont() {
document.getElementById("fontSizing").style.fontSize = "smaller";
}
function changeImage() {
var index = Math.ceil(Math.random() * 39 + 1);
document.images[0].src =
"https://developer.mozilla.org/media/img/promote/promobutton_mdn" +
index + ".png";
}
结果
说明
| Specification | Status | Comment |
|---|---|---|
| HTML Living Standard contextmenu |
Living Standard | No change from latest snapshot, HTML 5.1 |
| HTML 5.1 contextmenu |
Recommendation | Snapshot of HTML Living Standard, initial definition. |
浏览器兼容性
| Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|
| Basic support | 未实现[1] | 9 (9) | 未实现 | 未实现[1] | 未实现 |
| Feature | Android | Chrome for Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|---|
| Basic support | 未实现 | 未实现 | 20 (20) | 未实现 | 未实现 | ? |
[1]通过命令行选项--enable-blink-features = ContextMenu可以获得实验性实现。直到Chrome 52和Opera 39之前，它还是一个可选的、实验性功能，但由于Web兼容性问题，现已被删除。在2017年6月，它从这两个浏览器里被完全移除了。这些记录在 Chromium bug 87553。