Copy the contents of the div into a new iframe

Question

Ultimately I'm trying a technique to print a specific div, but I'm stuck on this part of the question. I have some code that should be copied from a div to a new iframe: variframe=document.createElement('iframe');vardiv=document.querySelector('div#sidebar');varcontent=div.innerHTML;iframe.srcdoc= `${con

P粉306523969 · Answer

Okay, I have an answer. I should know better as I just finished teaching a similar topic.

The code is valid, but it runs too early. I need to wait for the document to finish loading.

This is a working version:

var iframe = document.createElement('iframe');
var div = document.querySelector('div#sidebar');
var content = div.innerHTML;
iframe.srcdoc = `${content}`;

document.body.append(iframe);

//  等待iframe加载完成：
    iframe.onload = () => {
        iframe.contentWindow.print();
        iframe.contentWindow.addEventListener('afterprint', event => {
            iframe.remove();
        });
    };

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