解决 iframe 在 iPad 上无法滚动的问题

昨天用iframe模拟原生应用的webview功能,嵌套一个网址或本地HTML,今天通过测试,在ipad会出现页面无法滚动的问题。iframe的宽高都为屏幕的宽和高,设置属性scrolling=‘auto’,以及样式overflow: auto都没用,而且iframe元素不支持touch事件,在iframe嵌套的网页内部用js实现滚动也不现实。

怎么让ipad safari 中的iframe的内容在固定大小中可滚动?

网上说要用seamless属性。直接写个seamless。但是这个属性ipad的safari不支持。chrome是支持的。

IE6 – Windows: no support IE7 – Windows: no support IE8 – Windows – Windows: no support IE9 beta – Windows: no support Firefox 3.6 – Windows: no support Firefox 3.6 – OSX: no support Firefox 4.0 – beta Windows: no support Firefox 4.0 – beta OSX: no support Safari OSX: no support Chrome 7 – Windows: no support Chrome 7 – Windows: no support Chrome 9 – OSX: no support Opera 11 – OSX: no support

测试例子: http://www.maxdesign.com.au/jobs/example-seamless/

以上方法都无法解决ipad safari中iframe滚动的问题。

解决方法:

在iframe外加一层div,设置样式

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-webkit-overflow-scrolling:touch; overflow: scroll; 

让超出div的内容可以通过touch来滚动。

了解更多-webkit-overflow-scrolling

另外,如果iframe的src不是网址,而是本地的html,则需要给HTML的DOM添加监听事件,让html的body可以监听到touch事件,让嵌套的html也可以滚动。 js代码:

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var toScrollFrame = function(iFrame, mask) {
	if (!navigator.userAgent.match(/iPad|iPhone/i)){
		return false;
	}
	//do nothing if not iOS devie

	var mouseY = 0;
	var mouseX = 0;
	jQuery(iFrame).ready(function() {//wait for iFrame to load
		//remeber initial drag motition
		jQuery(iFrame).contents()[0].body.addEventListener('touchstart', function(e) {
			mouseY = e.targetTouches[0].pageY;
			mouseX = e.targetTouches[0].pageX;
		});

		//update scroll position based on initial drag position
		jQuery(iFrame).contents()[0].body.addEventListener('touchmove', function(e) {
			e.preventDefault();
			//prevent whole page dragging

			var box = jQuery(mask);
			box.scrollLeft(box.scrollLeft() + mouseX - e.targetTouches[0].pageX);
			box.scrollTop(box.scrollTop() + mouseY - e.targetTouches[0].pageY);
			//mouseX and mouseY don't need periodic updating, because the current position
			//of the mouse relative to th iFrame changes as the mask scrolls it.
		});
	});

	return true;
};

toScrollFrame('.myFrame', '.myMask'); 

html部分代码

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<!DOCTYPE html>
<html>
<head>
	<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
	<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=0, minimum-scale=1.0, maximum-scale=1.0">
	<meta name="apple-mobile-web-app-capable" content="yes">
	<meta name="apple-mobile-web-app-status-bar-style" content="black">
	<title>wrapScroller demo</title>
	<link rel="stylesheet" href="../style/wrapScroller.css" type="text/css" media="screen" />
	<script type="text/javascript" src="../jquery-1.8.0.min.js"></script>
	<script type="text/javascript">
		
	</script>
</head>
<body style="background: #ccc;">
	<div>
		HEADER - use 2 fingers to scroll contents:
	</div>
	<div id="scrollee" style="width:300px;height:300px;-webkit-overflow-scrolling:touch; overflow: scroll;">
		<iframe id="object" height="90%" width="100%" type="text/html" src="http://en.wikipedia.org/"></iframe>
	</div>
</body>

</html>