Javascript 阻止移动网页上的设备旋转

Blocking device rotation on mobile web pages

提问by qqryq

Is it possible to detect on my page, for example using Javascript, when user visit it using mobile device in portrait mode, and stop orientation changing when user rotate its phone to landscape? There is game on my page, optimized for portrait display only and I don't want it in landscape.

是否可以在我的页面上检测到，例如使用 Javascript，当用户在纵向模式下使用移动设备访问它时，并在用户将手机旋转到横向时停止方向改变？我的页面上有游戏，仅针对纵向显示进行了优化，我不想让它横向显示。

回答by DemiImp

New API's are developing (and are currently available)!

新的 API 正在开发中（目前可用）！

screen.orientation.lock();   // webkit only

and

和

screen.lockOrientation("orientation");

Where "orientation" can be any of the following:

其中“方向”可以是以下任何一项：

portrait-primary- It represents the orientation of the screen when it is in its primary portrait mode. A screen is considered in its primary portrait mode if the device is held in its normal position and that position is in portrait, or if the normal position of the device is in landscape and the device held turned by 90° clockwise. The normal position is device dependant.

Portrait-primary- 它表示屏幕处于主要纵向模式时的方向。如果设备处于其正常位置并且该位置处于纵向，或者如果设备的正常位置处于横向并且设备顺时针旋转 90°，则屏幕被视为处于其主要纵向模式。正常位置取决于设备。

portrait-secondary- It represents the orientation of the screen when it is in its secondary portrait mode. A screen is considered in its secondary portrait mode if the device is held 180° from its normal position and that position is in portrait, or if the normal position of the device is in landscape and the device held is turned by 90° anticlockwise. The normal position is device dependant.

Portrait-secondary- 它表示屏幕处于辅助纵向模式时的方向。如果设备从其正常位置保持 180° 并且该位置是纵向，或者如果设备的正常位置是横向并且被保持的设备逆时针旋转 90°，则屏幕被视为处于辅助纵向模式。正常位置取决于设备。

landscape-primary- It represents the orientation of the screen when it is in its primary landscape mode. A screen is considered in its primary landscape mode if the device is held in its normal position and that position is in landscape, or if the normal position of the device is in portrait and the device held is turned by 90° clockwise. The normal position is device dependant.

Landscape-primary- 它表示屏幕处于主要横向模式时的方向。如果设备处于其正常位置并且该位置处于横向，或者如果设备的正常位置处于纵向并且所持设备顺时针旋转 90°，则屏幕被视为处于其主要横向模式。正常位置取决于设备。

landscape-secondary- It represents the orientation of the screen when it is in its secondary landscape mode. A screen is considered in its secondary landscape mode if the device held is 180° from its normal position and that position is in landscape, or if the normal position of the device is in portrait and the device held is turned by 90° anticlockwise. The normal position is device dependant.

Landscape-secondary- 它表示屏幕处于辅助横向模式时的方向。如果手持设备与其正常位置成 180° 且该位置处于横向，或者如果设备的正常位置为纵向且手持设备逆时针旋转 90°，则屏幕被视为处于其次要横向模式。正常位置取决于设备。

portrait- It represents both portrait-primary and portrait-secondary.

肖像- 它代表肖像主要和肖像次要。

landscape- It represents both landscape-primary and landscape-secondary.

景观- 它代表景观主要和景观次要。

default- It represents either portrait-primary and landscape-primary depends on natural orientation of devices. For example, if the panel resolution is 1280*800, default will make it landscape, if the resolution is 800*1280, default will make it to portrait.

默认- 它代表纵向主要和横向主要取决于设备的自然方向。例如，如果面板分辨率为 1280*800，则默认为横向，如果分辨率为 800*1280，则默认为纵向。

Mozilla recommends adding a lockOrientationUniversal to screen to make it more cross-browser compatible.

Mozilla 建议在屏幕上添加一个 lockOrientationUniversal 以使其更具跨浏览器兼容性。

screen.lockOrientationUniversal = screen.lockOrientation || screen.mozLockOrientation || screen.msLockOrientation;

Go here for more info: https://developer.mozilla.org/en-US/docs/Web/API/Screen/lockOrientation

去这里了解更多信息：https: //developer.mozilla.org/en-US/docs/Web/API/Screen/lockOrientation

回答by Lèse majesté

In JavaScript-enabled browsers it should be easy to determine if the screen is in landscape or portrait mode and compensate using CSS. It may be helpful to give users the option to disable this or at least warn them that device rotation will not work properly.

在支持 JavaScript 的浏览器中，应该很容易确定屏幕是横向还是纵向模式，并使用 CSS 进行补偿。为用户提供禁用此功能的选项或至少警告他们设备旋转无法正常工作可能会有所帮助。

Edit

编辑

The easiest way to detect the orientation of the browser is to check the width of the browser versus the height of the browser. This also has the advantage that you'll know if the game is being played on a device that is naturally oriented in landscape mode (as some mobile devices like the PSP are). This makes more sense than trying to disable device rotation.

检测浏览器方向的最简单方法是检查浏览器的宽度与浏览器的高度。这还有一个优势，即您将知道游戏是否正在以横向模式自然定向的设备上运行（如某些移动设备，如 PSP）。这比尝试禁用设备旋转更有意义。

Edit 2

编辑 2

Daz has shown how you can detect device orientation, but detecting orientation is only half of the solution. If want to reverse the automatic orientation change, you'll need to rotate everything either 90° or 270°/-90°, e.g.

Daz 展示了如何检测设备方向，但检测方向只是解决方案的一半。如果要反转自动方向更改，则需要将所有内容旋转 90° 或 270°/-90°，例如

$(window).bind('orientationchange resize', function(event){
  if (event.orientation) {
    if (event.orientation == 'landscape') {
      if (window.rotation == 90) {
        rotate(this, -90);
      } else {
        rotate(this, 90);
      }
    }
  }
});

function rotate(el, degs) {
  iedegs = degs/90;
  if (iedegs < 0) iedegs += 4;
  transform = 'rotate('+degs+'deg)';
  iefilter = 'progid:DXImageTransform.Microsoft.BasicImage(rotation='+iedegs+')';
  styles = {
    transform: transform,
    '-webkit-transform': transform,
    '-moz-transform': transform,
    '-o-transform': transform,
    filter: iefilter,
    '-ms-filter': iefilter
  };
  $(el).css(styles);
}

Note: if you want to rotate in IE by an arbitrary angle (for other purposes), you'll need to use matrix transform, e.g.

注意：如果你想在 IE 中旋转任意角度（用于其他目的），你需要使用矩阵变换，例如

rads = degs * Math.PI / 180;
m11 = m22 = Math.cos(rads);
m21 = Math.sin(rads);
m12 = -m21;
iefilter = "progid:DXImageTransform.Microsoft.Matrix("
  + "M11 = " + m11 + ", "
  + "M12 = " + m12 + ", "
  + "M21 = " + m21 + ", "
  + "M22 = " + m22 + ", sizingMethod = 'auto expand')";
styles['filter'] = styles['-ms-filter'] = iefilter;

—or use CSS Sandpaper. Also, this applies the rotation style to the window object, which I've never actually tested and don't know if works or not. You may need to apply the style to a document element instead.

— 或使用CSS Sandpaper。此外，这将旋转样式应用于 window 对象，我从未实际测试过，也不知道是否有效。您可能需要将样式应用于文档元素。

Anyway, I would still recommend simply displaying a message that asks the user to play the game in portrait mode.

无论如何，我仍然建议简单地显示一条消息，要求用户以纵向模式玩游戏。

回答by Facundo Colombier

seems weird that no one proposed the CSS media query solution:

似乎很奇怪，没有人提出 CSS 媒体查询解决方案：

@media screen and (orientation: portrait) {
  ...
}

and the option to use a specific style sheet:

以及使用特定样式表的选项：

<link rel="stylesheet" type="text/css" href="css/style_p.css" media="screen and (orientation: portrait)">

MDN: https://developer.mozilla.org/en-US/docs/Web/Guide/CSS/Media_queries#orientation

MDN：https: //developer.mozilla.org/en-US/docs/Web/Guide/CSS/Media_queries#orientation

回答by Daz Williams

Simple Javascript code to make mobile browser display either in portrait or landscape..

使移动浏览器以纵向或横向显示的简单 Javascript 代码..

(Even though you have to enter html code twice in the two DIVs (one for each mode), arguably this will load faster than using javascript to change the stylesheet...

（即使您必须在两个 DIV 中输入两次 html 代码（每个模式一个），可以说这比使用 javascript 更改样式表加载速度更快...

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<title>Mobile Device</title>
<script type="text/javascript">
// Detect whether device supports orientationchange event, otherwise fall back to
// the resize event.
var supportsOrientationChange = "onorientationchange" in window,
    orientationEvent = supportsOrientationChange ? "orientationchange" : "resize";

window.addEventListener(orientationEvent, function() {
    if(window.orientation==0)
    {
      document.getElementById('portrait').style.display = '';
      document.getElementById('landscape').style.display = 'none';
    }
    else if(window.orientation==90)
    {
      document.getElementById('portrait').style.display = 'none';
      document.getElementById('landscape').style.display = '';
    }
}, false);
</script>
<meta name="HandheldFriendly" content="true" />
<meta name="viewport" content="width=device-width, height=device-height, user-scalable=no" />
</head>
<body>
<div id="portrait" style="width:100%;height:100%;font-size:20px;">Portrait</div>
<div id="landscape" style="width:100%;height:100%;font-size:20px;">Landscape</div>

<script type="text/javascript">
if(window.orientation==0)
{
  document.getElementById('portrait').style.display = '';
  document.getElementById('landscape').style.display = 'none';
}
else if(window.orientation==90)
{
  document.getElementById('portrait').style.display = 'none';
  document.getElementById('landscape').style.display = '';
}
</script>
</body>
</html>

Tested and works on Android HTC Sense and Apple iPad.

已在 Android HTC Sense 和 Apple iPad 上测试并运行。

回答by Qvcool

With the new CSS3 features, you could rotate the page the opposite orientation that they rotated. Sorry, no IE7- support. :(.

使用新的 CSS3 功能，您可以将页面旋转到与它们旋转的方向相反的方向。抱歉，不支持 IE7。:(。

var rotate = 0 - window.orientation;
setAttribute("transform:rotate("+rotate+"deg);-ms-transform:rotate("+rotate+"deg);-webkit-transform:rotate("+rotate+"deg)", "style");

回答by bhairava

#rotate-device {
    width: 100%;
    height: 100%;
    position: fixed;
    z-index: 9999;
    top: 0;
    left: 0;
    background-color: #000;
    background-image: url(/path to img/rotate.png);
    background-size: 100px 100px;
    background-position: center;
    background-repeat: no-repeat;
    display: none;
}

@media only screen and (max-device-width: 667px) and (min-device-width: 320px) and (orientation: landscape){
 #rotate-device {
  display: block;
 }
}

<div id="rotate-device"></div>

回答by NinjaCat

You could use the screenSize.width and screenSize.height properties and detect when the width > height and then handle that situation, either by letting the user know or by adjusting your screen accordingly.

您可以使用 screenSize.width 和 screenSize.height 属性并检测宽度 > 高度的时间，然后通过让用户知道或相应地调整屏幕来处理这种情况。

But the best solution is what @Doozer1979 says... Why would you override what the user prefers?

但最好的解决方案是@Doozer1979 所说的......你为什么要覆盖用户喜欢的内容？

回答by Browsera

You can detect the orientation change, but I don't think you can prevent it.

您可以检测到方向变化，但我认为您无法阻止它。

• https://developer.apple.com/library/content/documentation/AppleApplications/Reference/SafariWebContent/HandlingEvents/HandlingEvents.html
• http://articles.sitepoint.com/article/iphone-development-12-tips/2

• https://developer.apple.com/library/content/documentation/AppleApplications/Reference/SafariWebContent/HandlingEvents/HandlingEvents.html
• http://articles.sitepoint.com/article/iphone-development-12-tips/2