最近做了一个号称很炫的B/S展示软件,展示所用浏览器为Google Chrome。
要求展示时全屏,但是页面要有退出全屏按钮(液晶屏没有键盘)。
搜索实现方式几乎前篇一律,即两个JS函数一个实现全屏一个退出全屏:
function requestFullScreen(element)
{
if (element.requestFullscreen)
element.requestFullscreen();
else if (element.msRequestFullscreen)
element.msRequestFullscreen();
else if (element.mozRequestFullScreen)
element.mozRequestFullScreen();
else if (element.webkitRequestFullscreen)
element.webkitRequestFullscreen();
} function cancelFullScreen()
{
if (document.exitFullscreen)
document.exitFullscreen();
else if (document.msExitFullscreen)
document.msExitFullscreen();
else if (document.mozCancelFullScreen)
document.mozCancelFullScreen();
else if (document.webkitExitFullscreen)
document.webkitExitFullscreen();
}
但是在实际调用中发现cancelFullScreen只对requestFullScreen实现的全屏有效而对F11实现的全屏没有效果。
所以就想到使用requestFullScreen实现全屏,但是问题又来了requestFullScreen实现的全屏仅对当页有效,
在页面跳转时全屏效果就会消失,所以还是只能通过F11实现全屏。
又搜索其中一种退出方式为除了上面两个函数外又添加两个函数:
function isFullScreen()
{
return (document.fullScreenElement && document.fullScreenElement !== null)
|| document.mozFullScreen
|| document.webkitIsFullScreen;
} function toggleFullScreen(element)
{
if (isFullScreen())
cancelFullScreen();
else
requestFullScreen(element || document.documentElement);
}
通过调用toggleFullScreen函数实现退出全屏。
实现原理为:虽然之前已经F11全屏,但是isFullScreen检测结果依然为false,所以会调用requestFullScreen再次全屏。
而在刚开始实现全屏时会弹出退出全屏话框间接实现退出功能。
但是该方法也有个问题即会弹出两次退出全屏对话框,一次是JS调用全屏退出对话框一次是F11调用全屏对话框,如下:
修改toggleFullScreen如下便只弹出一次对话框:
function toggleFullScreen(element)
{
requestFullScreen(element || document.documentElement);
cancelFullScreen();
}
完整代码参考:
<html>
<head>
<meta charset="utf-8">
<title></title>
<script src="../js/jquery-1.10.1.min.js"></script>
<script>
function isFullScreen()
{
return (document.fullScreenElement && document.fullScreenElement !== null)
|| document.mozFullScreen
|| document.webkitIsFullScreen;
} function requestFullScreen(element)
{
if (element.requestFullscreen)
element.requestFullscreen();
else if (element.msRequestFullscreen)
element.msRequestFullscreen();
else if (element.mozRequestFullScreen)
element.mozRequestFullScreen();
else if (element.webkitRequestFullscreen)
element.webkitRequestFullscreen();
} function cancelFullScreen()
{
if (document.exitFullscreen)
document.exitFullscreen();
else if (document.msExitFullscreen)
document.msExitFullscreen();
else if (document.mozCancelFullScreen)
document.mozCancelFullScreen();
else if (document.webkitExitFullscreen)
document.webkitExitFullscreen();
} function toggleFullScreen(element)
{
requestFullScreen(element || document.documentElement);
cancelFullScreen();
} $(document).ready(function(){
$("#exit").click(function(){
toggleFullScreen(document.body);
});
});
</script>
</head>
<body>
<div style="padding-top:300px;"></div>
<button id="exit">退出</button>
</body>
</html>