How to move an iFrame in the DOM without losing it

2020-01-24 06:56发布

站内问答 / JavaScript
647 8 5

Take a look at this simple HTML:

<div id="wrap1">
  <iframe id="iframe1"></iframe>
</div>
<div id="warp2">
  <iframe id="iframe2"></iframe>
</div>

Let's say I wanted to move the wraps so that the #wrap2 would be before the #wrap1. The iframes are polluted by JavaScript. I am aware of jQuery's .insertAfter() and .insertBefore(). However, when I use those, the iFrame loses all of its HTML, and JavaScript variables and events.

Lets say the following was the iFrame's HTML:

<html>
  <head>
    <script type="text/javascript" src="jquery.js"></script>
    <script type="text/javascript">
      // The variable below would change on click
      // This represents changes on variables after the code is loaded
      // These changes should remain after the iFrame is moved
      variableThatChanges = false;
      $(function(){
        $("body").click(function(){ 
          variableThatChanges = true; 
        });
      });
    </script>
  </head>
  <body>
    <div id='anything'>Illustrative Example</div>
  </body>
</html>

In the above code, the variable variableThatChanges would...change if the user clicked on the body. This variable, and the click event, should remain after the iFrame is moved (along with any other variables/events that have been started)

My question is the following: with JavaScript (with or without jQuery), how can I move the wrap nodes in the DOM (and their iframe childs) so that the iFrame's window stays the same, and the iFrame's events/variables/etc stay the same?

8条回答
Luminary・发光体
2楼-- · 2020-01-24 07:43

This question is pretty old... but I did find a way to move an iframe without it reloading. CSS only. I have multiple iframes with camera streams, I dont like when they reload when i swap them. So i used a combination of float, position:absolute, and some dummy blocks to move them around without reloading them and having the desired layout on demand (resizing and all).

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淡お忘
3楼-- · 2020-01-24 07:46

In response to the bounty @djechlin placed on this question, I have forked the jsfiddle posted by @matt-h and have come to the conclusion that this is still not possible.

http://jsfiddle.net/gr3wo9u6/

//this does not work, the frames reload when appended back to the DOM
function swapFrames() {
    var w1 = document.getElementById('wrap1');
    var w2 = document.getElementById('wrap2');
    var f1 = w1.querySelector('iframe');
    var f2 = w2.querySelector('iframe');

    w1.removeChild(f1);
    w2.removeChild(f2);
    w1.appendChild(f2);
    w2.appendChild(f1);
    //f1.parentNode = w2;
    //f2.parentNode = w1;

    //alert(f1.parentNode.id);
}
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