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
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);
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>
如果您可以控制iframe内容，我强烈建议使用
调整观察者大小
只需在iframe的srcdoc属性的末尾插入以下内容， 如果需要，可以转义。
<script type="text/javascript">
var ro = new ResizeObserver(entries => {
for (let entry of entries) {
const cr = entry.contentRect;
// console.log(window.frameElement);
window.frameElement.style.height =cr.height +30+ "px";
}
});
ro.observe(document.body);
</script>
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>
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