javascript - JavaScript DOM移除元素(JavaScript DOM remove element)

Question

I'm trying to test if a DOM element exists, and if it does exist delete it, and if it doesn't exist create it.

(我正在尝试测试DOM元素是否存在，是否存在，将其删除，如果不存在，则创建它。)

var duskdawnkey = localStorage["duskdawnkey"];
var iframe = document.createElement("iframe");
var whereto = document.getElementById("debug");
var frameid = document.getElementById("injected_frame");
iframe.setAttribute("id", "injected_frame");
iframe.setAttribute("src", 'http://google.com');
iframe.setAttribute("width", "100%");
iframe.setAttribute("height", "400");

if (frameid) // check and see if iframe is already on page
{ //yes? Remove iframe
    iframe.removeChild(frameid.childNodes[0]);
} else // no? Inject iframe
{
    whereto.appendChild(iframe);
    // add the newly created element and it's content into the DOM
    my_div = document.getElementById("debug");
    document.body.insertBefore(iframe, my_div);
}

Checking if it exists works, creating the element works, but deleting the element doesn't.

(检查是否存在，创建元素有效，但删除该元素无效。)

Basically all this code does is inject an iframe into a webpage by clicking a button.

(基本上，所有这些代码所做的就是通过单击按钮将iframe注入网页。)

What I would like to happen is if the iframe is already there to delete it.

(我想发生的是，如果iframe已经存在，可以删除它。)

But for some reason I am failing.

(但是由于某种原因，我失败了。)

  ask by Joshua Redfield translate from so

Answer 1

removeChild should be invoked on the parent, ie:

(应该在父级上调用removeChild ，即：)

parent.removeChild(child);

In your example, you should be doing something like:

(在您的示例中，您应该执行以下操作：)

if (frameid) {
    frameid.parentNode.removeChild(frameid);
}