我正在开发一个类似igoogle的应用程序。来自其他应用程序(在其他域中)的内容使用iframe显示。

我如何调整iframes的大小以适应iframes的内容的高度?

我试图破译的javascript谷歌使用,但它是模糊的,搜索网络至今一无所获。

更新:请注意,内容是从其他域加载的,因此适用同源策略。


当前回答

David Bradshaw和Chris Jacob已经建议使用postMessage方法。我完全同意,做这些事情的正确方法。

我只是想发布一个例子,真实的代码,以防它对一些人来说是现成的答案。

在iframed面:

<body onload="docResizePipe()">
<script>
var v = 0;
const docResizeObserver = new ResizeObserver(() => {
    docResizePipe();
});
docResizeObserver.observe(document.querySelector("body"));
function docResizePipe() {
    v += 1;
    if (v > 5) {
        return;
    }
    var w = document.body.scrollWidth;
    var h = document.body.scrollHeight;
    window.parent.postMessage([w,h], "*");
}
setInterval(function() {
    v -= 1;
    if (v < 0) {
        v = 0;
    }
}, 300);
</script>

注意递归阻塞机制——这显然是必要的,因为Firefox中有一个bug,但不管怎样,让它存在吧。

在父文档端:

<iframe id="rpa-frame" src="3.html" style="border: none;"></iframe>
<script>
var rpaFrame = document.getElementById("rpa-frame");

window.addEventListener("message", (event) => {
    var width = event.data[0];
    var height = event.data[1];
    rpaFrame.width = parseInt(width)+60;
    rpaFrame.height = parseInt(height)+60;
    console.log(event);
}, false);
</script>

希望对大家有用。

其他回答

https://developer.mozilla.org/en/DOM/window.postMessage

window.postMessage() window.postMessage is a method for safely enabling cross-origin communication. Normally, scripts on different pages are only allowed to access each other if and only if the pages which executed them are at locations with the same protocol (usually both http), port number (80 being the default for http), and host (modulo document.domain being set by both pages to the same value). window.postMessage provides a controlled mechanism to circumvent this restriction in a way which is secure when properly used. Summary window.postMessage, when called, causes a MessageEvent to be dispatched at the target window when any pending script that must be executed completes (e.g. remaining event handlers if window.postMessage is called from an event handler, previously-set pending timeouts, etc.). The MessageEvent has the type message, a data property which is set to the string value of the first argument provided to window.postMessage, an origin property corresponding to the origin of the main document in the window calling window.postMessage at the time window.postMessage was called, and a source property which is the window from which window.postMessage is called. (Other standard properties of events are present with their expected values.)

iFrame- resizzer库使用postMessage来保持iFrame的大小与其内容一致,并使用MutationObserver来检测内容的变化,而不依赖于jQuery。

https://github.com/davidjbradshaw/iframe-resizer

jQuery:跨域脚本的优点

http://benalman.com/projects/jquery-postmessage-plugin/

有调整iframe窗口大小的演示…

http://benalman.com/code/projects/jquery-postmessage/examples/iframe/

这篇文章展示了如何消除对jQuery的依赖…Plus有很多有用的信息和链接到其他解决方案。

http://www.onlineaspect.com/2010/01/15/backwards-compatible-postmessage/

Barebones操作...

http://onlineaspect.com/uploads/postmessage/parent.html

HTML 5工作草案在window.postMessage

http://www.whatwg.org/specs/web-apps/current-work/multipage/comms.html#crossDocumentMessages

John Resig谈跨窗口消息传递

http://ejohn.org/blog/cross-window-messaging/

找不到能完美处理大文本+大图像的东西,但我最终得到了这个,似乎这是对的,或者几乎是对的,每一次:

    iframe.addEventListener("load",function(){
        // inlineSize, length, perspectiveOrigin, width
        let heightMax = 0;
        // this seems to work best with images...
        heightMax = Math.max(heightMax,iframe.contentWindow.getComputedStyle(iframe.contentWindow.document.body).perspectiveOrigin.split("px")[0]);
        // this seems to work best with text...
        heightMax = Math.max(heightMax,iframe.contentWindow.document.body.scrollHeight);
        // some large 1920x1080 images always gets a little bit off on firefox =/
        const isFirefox = navigator.userAgent.toLowerCase().indexOf('firefox') > -1;
        if(isFirefox && heightMax >= 900){
            // grrr..
            heightMax = heightMax + 100;
        }

        iframe.style.height = heightMax+"px";
        //console.log(heightMax);
    });

我正在实现ConroyP的帧中帧解决方案,以取代基于设置文档的解决方案。域,但发现它是相当困难的确定iframe的内容的高度在不同的浏览器(测试与FF11, Ch17和IE9现在)。

ConroyP uses:

var height = document.body.scrollHeight;

但这只适用于初始页面加载。我的iframe有动态内容,我需要在某些事件上调整iframe的大小。

我最终为不同的浏览器使用了不同的JS属性。

function getDim () {
    var body = document.body,
        html = document.documentElement;

    var bc = body.clientHeight;
    var bo = body.offsetHeight;
    var bs = body.scrollHeight;
    var hc = html.clientHeight;
    var ho = html.offsetHeight;
    var hs = html.scrollHeight;

    var h = Math.max(bc, bo, bs, hc, hs, ho);

    var bd = getBrowserData();

    // Select height property to use depending on browser
    if (bd.isGecko) {
        // FF 11
        h = hc;
    } else if (bd.isChrome) {
        // CH 17
        h = hc;
    } else if (bd.isIE) {
        // IE 9
        h = bs;
    }

    return h;
}

getBrowserData()是受Ext Core http://docs.sencha.com/core/source/Ext.html#method-Ext-apply启发的浏览器检测函数

这在FF和IE上运行得很好,但在Chrome上就出现了问题。其中一个是时间问题,显然Chrome需要一段时间来设置/检测iframe的高度。如果iframe比内容高,Chrome也不会正确返回iframe中内容的高度。当高度降低时,这将不适用于动态内容。

为了解决这个问题,我总是在检测内容高度之前将iframe设置为较低的高度,然后将iframe高度设置为正确的值。

function resize () {
    // Reset the iframes height to a low value.
    // Otherwise Chrome won't detect the content height of the iframe.
    setIframeHeight(150);

    // Delay getting the dimensions because Chrome needs
    // a few moments to get the correct height.
    setTimeout("getDimAndResize()", 100);
}

代码没有优化,这是从我的devel测试:)

希望有人觉得这有用!

http://www.phinesolutions.com/use-jquery-to-adjust-the-iframe-height.html上的解决方案很好(使用jQuery):

<script type=”text/javascript”>
  $(document).ready(function() {
    var theFrame = $(”#iFrameToAdjust”, parent.document.body);
    theFrame.height($(document.body).height() + 30);
  });
</script>

我不知道你是否需要在长度上加上30…我为我工作过。

仅供参考:如果你已经在你的iFrame上有一个“height”属性,这只是添加了style="height: xxx"。这可能不是你想要的。

这个答案只适用于使用Bootstrap的网站。Bootstrap的响应式嵌入特性完成了这项工作。它是基于内容的宽度(而不是高度)。

<!-- 16:9 aspect ratio -->
<div class="embed-responsive embed-responsive-16by9">
  <iframe class="embed-responsive-item" src="http://www.youtube.com/embed/WsFWhL4Y84Y"></iframe>
</div>

jsfiddle: http://jsfiddle.net/00qggsjj/2/

http://getbootstrap.com/components/#responsive-embed