How to communicate between the parent page and the iframe page All In One
How to communicate between the parent page and the iframe page All In One
父页面与 iframe 页面之间如何通信 All In One
postMessage
https://developer.mozilla.org/en-US/docs/Web/API/Window/postMessage
https://caniuse.com/?search=postMessage
// in main window
window.addEventListener('message',function(message){
if(message.data.type=="iframeScrollEvent"){
//do something
}
});
// in iframe
parent.postMessage({
type:"iframeScrollEvent",
other:"other data to pass"
}, "the url of main window");
Broadcast Channel API
https://developer.mozilla.org/en-US/docs/Web/API/Broadcast_Channel_API
https://caniuse.com/?search=Broadcast Channel
https://caniuse.com/?search=Broadcast Channel API
// in main window
const bc = new BroadcastChannel('iframeScrollEvent');
bc.onmessage = function(message){
console.log(message.data);
};
// in iframe
const bc = new BroadcastChannel('iframeScrollEvent');
bc.postMessage('Some data');
iframe.contentDocument
const iframe = document.getElementById('childPage');
console.log('iframe', iframe, iframe.contentDocument);
// iframe <iframe id="childPage" name="childPage" width="300" height="600" src="https://xgqfrms.xyz/preview/18/1294" frameborder="0">…</iframe>#document<!DOCTYPE html><html lang="en" style="font-size: 250%;">…</html></iframe> null
iframe.contentDocument;
// null
iframe.document;
// undefined
https://developer.mozilla.org/en-US/docs/Web/API/HTMLIFrameElement
CORS bug
-
跨域 iframe 通信, 获取不到 iframe document ❌
-
同域 iframe 通信, 可以获取不到 iframe document ✅
CORS
https://developer.mozilla.org/en-US/docs/Web/Security/Same-origin_policy
refs
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标签:
iframe
, Web API
, postMessage
, Broadcast Channel API
, contentDocument
, HTMLIFrameElement
, CORS
, JavaScript
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