[JavaScript] Checking if iframe contents are loaded? : iframe 로딩 완료 이벤트 확인

[Question] 

Checking if iframe contents are loaded?

[Answer] 

To be notified when the iFrame is loaded, you can still use the onload event today.

Create the iFrame and set an ID for JavaScript:

<iframe id="test" src="SRC_URL"></iframe>

Now access the iFrame with JavaScript and set an EventListener for the load event:

const iframe = document.getElementById("test");
iframe.addEventListener("load", function() {
    console.log("Finish");
});

When the iFrame has finished loading, "Finish" is logged in the console. I have tested it with Google Chrome and it works fine.

Within the EventHandler you can then perform actions. For example, send a message:

iframe.contentWindow.postMessage({ title: "Hi", message: "Seems to work" }, targetOrigin);

Please also make sure that you have permission to embed the web page (X-frame options).

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[출처] https://stackoverflow.com/questions/60461930/checking-if-iframe-contents-are-loaded