Javascript->使用postMessage方法调整iframe的大小 [英] Javascript --> iframe resizing using postMessage method
问题描述
我正在尝试理解另一个Stackoverflow答案(跨域iframe调整器?)，旨在解决如何根据其高度调整iframe(位于与其嵌入的域不同的域中)的大小.想知道是否有人可以在下面回答我的问题.
I'm trying to understand another Stackoverflow answer (cross-domain iframe resizer?) that purports to solve how to resize an iframe (hosted on a domain separate from the domain it's embedded in) according to its height. Wondering if anyone could answer my questions below.
解决方案:
iframe:
<!DOCTYPE html>
<head>
</head>
<body onload="parent.postMessage(document.body.scrollHeight, 'http://target.domain.com');">
<h3>Got post?</h3>
<p>Lots of stuff here which will be inside the iframe.</p>
</body>
</html>
包含iframe(并希望知道其高度)的父页面:
The parent page which contains the iframe (and would like to know its height):
<script type="text/javascript">
function resizeCrossDomainIframe(id, other_domain) {
var iframe = document.getElementById(id);
window.addEventListener('message', function(event) {
if (event.origin !== other_domain) return; // only accept messages from the specified domain
if (isNaN(event.data)) return; // only accept something which can be parsed as a number
var height = parseInt(event.data) + 32; // add some extra height to avoid scrollbar
iframe.height = height + "px";
}, false);
}
</script>
<iframe src='http://example.com/page_containing_iframe.html' id="my_iframe" onload="resizeCrossDomainIframe('my_iframe', 'http://example.com');">
</iframe>
我的问题:
- http://target.domain.com 指的是iframe所在的域
嵌入其中吧?不是iframe托管的域? -
在
function resizeCrossDomainIframe(id, other_domain) {行中，我不应该将"id"与iframe的id和"other_domain"与iframe托管的域名互换，对吗?它们只是我稍后在调用函数时指定的参数.
- http://target.domain.com refers to the domain the iframe is
embedded within, right? NOT the domain that the iframe is hosted on? In the
function resizeCrossDomainIframe(id, other_domain) {line, I'm not supposed to interchange "id" with theidof theiframeand "other_domain" with the domain name that the iframe is hosted on, right? They're only parameters that I specify later when I call the function.
不是在iframe标记中使用onload，而是在jQuery中编写了等效的代码，该jQuery在嵌入iframe的页面上加载:
Instead of using onload within the iframe tag, I wrote the equivalent in jQuery, which loads on the page that embeds the iframe:
$('#petition-embed').load(function() {
resizeCrossDomainIframe('petition-embed','http://target.domain.com');
});
$('#petition-embed').load(function() {
resizeCrossDomainIframe('petition-embed','http://target.domain.com');
});
我在return周围添加了括号:
I added brackets around return:
if (event.origin !== other_domain) {return;} // only accept messages from the specified domain
if (isNaN(event.data)) {return;} // only accept something which can be parsed as a number
if (event.origin !== other_domain) {return;} // only accept messages from the specified domain
if (isNaN(event.data)) {return;} // only accept something which can be parsed as a number
看起来不错吗?
推荐答案
I needed to do something similar, and found this example that seems simpler: using postmessage to refresh iframe's parent document
这就是我在iframe中得到的结果:
Here is what I ended up with in the iframe:
window.onload = function() {
window.parent.postMessage(document.body.scrollHeight, 'http://targetdomain.com');
}
在接收方的父母中:
window.addEventListener('message', receiveMessage, false);
function receiveMessage(evt){
if (evt.origin === 'http://sendingdomain.com') {
console.log("got message: "+evt.data);
//Set the height on your iframe here
}
}
这篇关于Javascript->使用postMessage方法调整iframe的大小的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
