iframe在ipad safari的显示

今 天要在web中嵌套一个网址或本地HTML，用到了iframe，在电脑上设置scrolling=‘auto’，宽度高度，会有滚动条出现。而在 ipad上会全部显示整个网页的宽度高度。scrolling属性无效。原来在html5中的iframe已经只有剩下src的属性。 
但是若设置scrolling=‘no’.还是会生效的。页面只显示定义的高度和宽度的大小。设置overflow:hidden都没用。

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/

所以以上方法都无法解决ipad safari中iframe滚动的问题。

解决办法： 
在iframe外加一层div，设置样式-webkit-overflow-scrolling:touch; overflow: scroll; 
让超出div的内容可以通过touch来滚动。

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。

    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');

最终代码

    <!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>

参考： 
http://stackoverflow.com/questions/6139564/iframe-size-on-ipad 
http://jsfiddle.net/CobaltBlueDW/zHR8s/ 
http://stackoverflow.com/questions/4804604/html5-iframe-seamless-attribute