Element: mousewheel event

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The detail property
wheelDelta, wheelDeltaX and wheelDeltaY value
规范
浏览器兼容性
另请参阅
相关话题

弃用
This feature is no longer recommended. Though some browsers might still support it, it may have already been removed from the relevant web standards, may be in the process of being dropped, or may only be kept for compatibility purposes. Avoid using it, and update existing code if possible; see the 兼容性表格 at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.

非标
此特征是非标准的，且不在标准轨道中。不要在面向 Web 的生产站点中使用它：它不适用于每个用户。实现之间可能存在大的不兼容性，且行为将来可能改变。

obsolete and non-standard mousewheel event is fired asynchronously at an 元素 to provide updates while a mouse wheel or similar device is operated. The mousewheel event was never part of any standard, and while it was implemented by several browsers, it was never implemented by Firefox.

重要： Instead of this obsolete event, use the standard wheel 事件。

冒泡	Yes
可取消	Yes
接口	`MouseWheelEvent`
事件处理程序特性	`onmousewheel`

The detail property

值对于 detail property is always zero, except in Opera, which uses detail similarly to the Firefox-only DOMMouseScroll event's detail value, which indicates the scroll distance in terms of lines, with negative values indicating the scrolling movement is either toward the bottom or toward the right, and positive values indicating scrolling to the top or left.

注意： On macOS, the scroll distance (and therefore the value of detail ) is computed based on the accelerated scroll distance.

在 Linux， 2 or -2 is set per native wheel event.

wheelDelta, wheelDeltaX and wheelDeltaY value

wheelDelta attribute value is an abstract value which indicates how far the wheel turned. If the wheel has rotated away from the user, it's positive, otherwise negative. This means that the delta value sign is different from DOM Level 3 Event's wheel . However, the meaning of the amount of these values is not the same between browsers. See following explanation for the detail.

IE and Opera (Presto) only support wheelDelta attribute and do not support horizontal scroll.

wheelDeltaX attribute value indicates the wheelDelta attribute value along the horizontal axis. When a user operates the device for scrolling to right, the value is negative. Otherwise, i.e., if it's to left, the value is positive.

wheelDeltaY attribute value indicates the wheelDelta attribute value along the vertical axis. The sign of the value is the same as the wheelDelta attribute value.

Internet Explorer

The value is the same as the delta value of Windows' WM_MOUSEWHEEL or WM_MOUSEHWHEEL . It means that if the mouse wheel doesn't support high resolution scroll, the value is 120 per notch. The value isn't changed even if the scroll amount of system settings is page scroll.

Chrome

On Windows, the value is the same as the delta value of WM_MOUSEWHEEL or WM_MOUSEHWHEEL . And also, the value isn't changed even if the scroll amount of system settings is page scroll, i.e., the value is the same as IE on Windows.

On Linux, the value is 120 or -120 per native wheel event. This makes the same behavior as IE and Chrome for Windows.

On Mac, the value is complicated. The value is changed if the device that causes the native wheel event supports continuous scroll.

If the device supports continuous scroll (e.g., trackpad of MacBook or mouse wheel which can be turned smoothly), the value is computed from accelerated scroll amount. In this case, the value is the same as Safari.

If the device does not support continuous scroll (typically, old mouse wheel which cannot be turned smoothly), the value is computed from non-accelerated scroll amount (120 per notch). In this case, the value is different from Safari.

This difference makes a serious issue for web application developers. That is, web developers cannot know if mousewheel event is caused by which device.

见 WebInputEventFactory::mouseWheelEvent 的 Chromium's source code for the detail.

Safari

The value is always computed from accelerated scroll amount. This is really different from other browsers except Chrome with continuous scroll supported device.

Opera (Presto)

The value is always the detail attribute value ✕ 40 .

On Windows, since the detail attribute value is computed from actual scroll amount, the value is different from other browsers except the scroll amount per notch is 3 lines in system settings or a page.

On Linux, the value is 80 or -80 per native wheel event. This is different from other browsers.

On Mac, the detail attribute value is computed from accelerated scroll amout of native event. The value is usually much bigger than Safari's or Chrome's value.

规范

Not part of any specification.

浏览器兼容性

更新 GitHub 上的兼容性数据

	桌面						移动
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`mousewheel` event 弃用非标	Chrome 31	Edge ≤79	Firefox No	IE ?	Opera ?	Safari ?	WebView Android ?	Chrome Android ?	Firefox Android No	Opera Android ?	Safari iOS ?	Samsung Internet Android ?

图例

完整支持
不支持
兼容性未知 ?
非标。预期跨浏览器支持较差。
弃用。不要用于新网站。

另请参阅

MouseWheelEvent
Gecko's legacy mouse wheel events: DOMMouseScroll , MozMousePixelScroll
Standardized wheel event: wheel

元数据

最后修改： Jul 11, 2019

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