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
其他回答
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
当你想缩小网页以适应iframe大小时:
您应该调整iframe的大小以适应内容 然后你应该缩小整个iframe与加载的网页内容
这里有一个例子:
<div id="wrap">
<IFRAME ID="frame" name="Main" src ="http://www.google.com" />
</div>
<style type="text/css">
#wrap { width: 130px; height: 130px; padding: 0; overflow: hidden; }
#frame { width: 900px; height: 600px; border: 1px solid black; }
#frame { zoom:0.15; -moz-transform:scale(0.15);-moz-transform-origin: 0 0; }
</style>
下面是一个简单的解决方案，使用与iframe内容相同的服务器提供的动态生成的样式表。很简单，样式表“知道”iframe中有什么，并且知道用于设置iframe样式的维度。这就绕过了同源策略限制。
http://www.8degrees.co.nz/2010/06/09/dynamically-resize-an-iframe-depending-on-its-content/
因此，所提供的iframe代码将有一个附带的样式表，像这样…
<link href=“http://your.site/path/to/css?contents_id=1234&dom_id=iframe_widget” rel=“stylesheet” type=“text/css” /> <iframe id=“iframe_widget” src=“http://your.site/path/to/content?content_id=1234” frameborder=“0” width=“100%” scrolling=“no”></iframe>
这要求服务器端逻辑能够计算iframe呈现内容的尺寸。
使用jQuery的最简单方法:
$("iframe")
.attr({"scrolling": "no", "src":"http://www.someotherlink.com/"})
.load(function() {
$(this).css("height", $(this).contents().height() + "px");
});
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.
