内容菜单 | contextmenu (attribute)

contextmenu (attribute)

contextmenu全局属性是指用于某个元素的“上下文菜单”的<menu>的ID属性

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

规范

规范	状态	评论
HTML生活标准该规范中的'contextmenu'的定义。	生活水平	最新的快照，HTML 5.1没有变化
HTML 5.1该规范中'contextmenu'的定义。	建议	HTML Living Standard的快照，最初的定义。

浏览器兼容性

Feature	Chrome	Firefox (Gecko)	Internet Explorer	Opera	Safari
Basic support	No support1	9 (9)	No support	No support1	No support

Feature	Android	Chrome for Android	Firefox Mobile (Gecko)	IE Mobile	Opera Mobile	Safari Mobile
Basic support	No support	No support	20 (20)	No support	No support	?