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
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!
其他回答
This is slightly tricky as you have to know when the iframe page has loaded, which is difficuly when you're not in control of its content. Its possible to add an onload handler to the iframe, but I've tried this in the past and it has vastly different behaviour across browsers (not guess who's the most annoying...). You'd probably have to add a function to the iframe page that performs the resize and inject some script into the content that either listens to load events or resize events, which then calls the previous function. I'm thinking add a function to the page since you want to make sure its secure, but I have no idea how easy it will be to do.
使用jQuery:
parent.html
<body>
<script type="text/javascript" src="https://code.jquery.com/jquery-2.1.4.min.js"></script>
<style>
iframe {
width: 100%;
border: 1px solid black;
}
</style>
<script>
function foo(w, h) {
$("iframe").css({width: w, height: h});
return true; // for debug purposes
}
</script>
<iframe src="child.html"></iframe>
</body>
child.html
<body>
<script type="text/javascript" src="https://code.jquery.com/jquery-2.1.4.min.js"></script>
<script>
$(function() {
var w = $("#container").css("width");
var h = $("#container").css("height");
var req = parent.foo(w, h);
console.log(req); // for debug purposes
});
</script>
<style>
body, html {
margin: 0;
}
#container {
width: 500px;
height: 500px;
background-color: red;
}
</style>
<div id="container"></div>
</body>
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/
最后，我找到了一些其他的解决方案，从iframe使用窗口发送数据到父网站。postMessage(消息、targetOrigin);。下面我来解释一下我是怎么做到的。
站点A = http://foo.com 站点B = http://bar.com
sitb在网站内部加载
SiteB网站有这条线
window.parent.postMessage("Hello From IFrame", "*");
or
window.parent.postMessage("Hello From IFrame", "http://foo.com");
然后site ea有如下代码
// Here "addEventListener" is for standards-compliant web browsers and "attachEvent" is for IE Browsers.
var eventMethod = window.addEventListener ? "addEventListener" : "attachEvent";
var eventer = window[eventMethod];
var messageEvent = eventMethod == "attachEvent" ? "onmessage" : "message";
// Listen to message from child IFrame window
eventer(messageEvent, function (e) {
alert(e.data);
// Do whatever you want to do with the data got from IFrame in Parent form.
}, false);
如果你想添加安全连接，你可以在事件输入中使用这个If条件(messageEvent, function (e) {})
if (e.origin == 'http://iframe.example.com') {
alert(e.data);
// Do whatever you want to do with the data got from IFrame in Parent form.
}
对于IE
IFrame内:
window.parent.postMessage('{"key":"value"}','*');
外:
eventer(messageEvent, function (e) {
var data = jQuery.parseJSON(e.data);
doSomething(data.key);
}, false);
我在这里读了很多答案，但几乎每个人都给出了一些交叉起源的框架块。
错误示例:
未捕获的DOMException:阻止了一个原点为“null”的帧 访问跨原点框架。
在相关线程中的答案也是一样的:
使iframe自动调整高度根据内容而不使用滚动条?
我不想使用第三方库，如iFrame Resizer或类似的库。
来自@ChrisJacob的答案很接近，但我缺少一个完整的工作示例，而不仅仅是链接。@Selvamani和@latitov也是很好的互补。
https://stackoverflow.com/a/3219970/3850405
我使用width="100%"的iframe，但代码可以修改为宽度以及工作。
这是我如何解决设置自定义高度的iframe:
iframe嵌入:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta name="description"
content="Web site" />
<title>Test with embedded iframe</title>
</head>
<body>
<noscript>You need to enable JavaScript to run this app.</noscript>
<div id="root"></div>
<iframe id="ifrm" src="https://localhost:44335/package/details?key=123" width="100%"></iframe>
<script type="text/javascript">
window.addEventListener('message', receiveMessage, false);
function receiveMessage(evt) {
console.log("Got message: " + JSON.stringify(evt.data) + " from origin: " + evt.origin);
// Do we trust the sender of this message?
if (evt.origin !== "https://localhost:44335") {
return;
}
if (evt.data.type === "frame-resized") {
document.getElementById("ifrm").style.height = evt.data.value + "px";
}
}
</script>
</body>
</html>
iframe源代码，示例来自创建React应用程序，但只使用HTML和JS。
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta name="description"
content="Web site created using create-react-app" />
<title>React App</title>
</head>
<body>
<noscript>You need to enable JavaScript to run this app.</noscript>
<div id="root"></div>
<script type="text/javascript">
//Don't run unless in an iframe
if (self !== top) {
var rootHeight;
setInterval(function () {
var rootElement = document.getElementById("root");
if (rootElement) {
var currentRootHeight = rootElement.offsetHeight;
//Only send values if height has changed since last time
if (rootHeight !== currentRootHeight) {
//postMessage to set iframe height
window.parent.postMessage({ "type": "frame-resized", "value": currentRootHeight }, '*');
rootHeight = currentRootHeight;
}
}
}
, 1000);
}
</script>
</body>
</html>
带有setInterval的代码当然可以修改，但它与动态内容一起工作得非常好。setInterval仅在内容嵌入iframe时激活，postMessage仅在高度改变时发送消息。
你可以在这里阅读更多关于Window.postMessage()的内容，但描述非常适合我们想要实现的目标:
The window.postMessage() method safely enables cross-origin communication between Window objects; e.g., between a page and a pop-up that it spawned, or between a page and an iframe embedded within it. Normally, scripts on different pages are allowed to access each other if and only if the pages they originate from share the same protocol, port number, and host (also known as the "same-origin policy"). window.postMessage() provides a controlled mechanism to securely circumvent this restriction (if used properly).
https://developer.mozilla.org/en-US/docs/Web/API/Window/postMessage
