我正在为移动设备建立一个网站。有一页特别适合在横屏模式下浏览。
是否有一种方法来检测访问该页面的用户是否在纵向模式下查看它，如果是的话，显示一条消息通知用户该页面在横向模式下查看最好?如果用户已经在横屏模式下查看，则不会出现任何消息。
所以基本上，我想让网站检测视口的方向，如果方向是纵向，然后显示一个警告消息，建议用户这个页面最好在横向模式下查看。
当前回答
你可以使用CSS3:
@media screen and (orientation:landscape)
{
body
{
background: red;
}
}
其他回答
//see also http://stackoverflow.com/questions/641857/javascript-window-resize-event
//see also http://mbccs.blogspot.com/2007/11/fixing-window-resize-event-in-ie.html
/*
Be wary of this:
While you can just hook up to the standard window resize event, you'll find that in IE, the event is fired once for every X and once for every Y axis movement, resulting in a ton of events being fired which might have a performance impact on your site if rendering is an intensive task.
*/
//setup
window.onresize = function(event) {
window_resize(event);
}
//timeout wrapper points with doResizeCode as callback
function window_resize(e) {
window.clearTimeout(resizeTimeoutId);
resizeTimeoutId = window.setTimeout('doResizeCode();', 10);
}
//wrapper for height/width check
function doResizeCode() {
if(window.innerHeight > window.innerWidth){
alert("Please view in landscape");
}
}
不是270，而是-90(-90)。
$(window).on("orientationchange",function( event ){
alert(screen.orientation.type)
});
这就是我用的。
function getOrientation() {
// if window.orientation is available...
if( window.orientation && typeof window.orientation === 'number' ) {
// ... and if the absolute value of orientation is 90...
if( Math.abs( window.orientation ) == 90 ) {
// ... then it's landscape
return 'landscape';
} else {
// ... otherwise it's portrait
return 'portrait';
}
} else {
return false; // window.orientation not available
}
}
实现
window.addEventListener("orientationchange", function() {
// if orientation is landscape...
if( getOrientation() === 'landscape' ) {
// ...do your thing
}
}, false);
不要尝试固定窗口。方向查询(0,90等并不意味着纵向，横向等):
http://www.matthewgifford.com/blog/2011/12/22/a-misconception-about-window-orientation/
即使在iOS7上，0也不总是竖屏的，这取决于你进入浏览器的方式
