Make custom HTML elements droppable in iframe

问题

I like to have a list which elements can be dropped in a list in an iframe similar to this example. I found a working solution via this thread but in my case I need other elements than <li>'s.

Here's my setup:

<div id="container">
    <ul>
        <li>To drop 1</li>
        <li>To drop 2</li>
    </ul>
</div>
<iframe id="frame" src=""></iframe>

and the iframe content:

<ul id="sortable">
    <li>Element</li>
    <li>Element</li>
    <li>Element</li>
</ul>

This works as you can see here.

It even works when changing the <ul> and <li>'s to <div> (example and iframe).

When I use custom tags it's working with <foo> and <bar> tags but what I really need is to get it working with <modules> and <module> tags.

<foo id="sortable">  //WORKS!!
    <bar>Element</bar>
    <bar>Element</bar>
    <bar>Element</bar>
</foo>

<modules id="sortable"> //DOESN'T WORK!!
    <module>Element</module>
    <module>Element</module>
    <module>Element</module>
</modules>

Here's the fiddle and the iframe of what I actually need to work.

So basically the draggable and sortable method is not working with my custom html tags. What's so different between <foo>, <bar> and <modules>, <module>?

UPDATE

It seems this is an issue on webkit browsers only since it's working fine on FF - wasn't able to test on a Windows machine yet.

When dragging the element it will create a "helper" which gets some inline style:

position:absolute;left:XXXpx;right:XXXpx;width:XXXpx;heightXXXpx;z-index:1000

while on webkits it only get position, left and right:

position:absolute;left:XXXpx;right:XXXpx;

回答1:

Try using HTML5 Drag and Drop

<script id="dnd">
  function over(e) {
    e.preventDefault();
  }

  function drag(e) {
    e.dataTransfer.setData("text", e.target.dataset.id);
  }

  function drop(e) {
    e.preventDefault();
    var data = e.dataTransfer.getData("text");
    e.target.appendChild(
      parent.document.querySelector("[data-id='" + data + "']")
    );
  }

  window.onload = function() {
    var mods = document.querySelector("modules");    
    var script = document.getElementById("dnd");   
    var iframe = document.querySelector("iframe");
    iframe.src = URL.createObjectURL(
      new Blob(
        ["<!doctype html>" + script.outerHTML + mods.outerHTML]
        , {"type": "text/html"}
      )
    );
  }
</script>
<div id="container">
  <ul>
    <li data-id="1" ondragstart="drag(event)" draggable="true">To drop 1</li>
    <li data-id="2" ondragstart="drag(event)" draggable="true">To drop 2</li>
  </ul>
</div>
<modules ondrop="drop(event)" ondragover="over(event)">
  <module>Element</module>
  <module>Element</module>
  <module>Element</module>
  <style>
    module, li {
      border:1px solid #000;
      display:block;
      list-style:none;
      margin:0;
      padding:5px;
    }
  </style>
</modules>
<iframe src=""></iframe>

jsfiddle http://jsfiddle.net/zo2bx4f7/

回答2:

The same issue appears with Sortable.
I found that its because of the length of the tag. It must not be longer than 4 chars total.

Check out this fiddle:

Sortable.create(document.getElementById('sortable-1'), {});
Sortable.create(document.getElementById('sortable-2'), {});
Sortable.create(document.getElementById('sortable-3'), {});
Sortable.create(document.getElementById('sortable-4'), {});

foo,
modu, modul, modules {
    display: block;
}

foo > bar,
modu > module,
modul > module,
modules > module {
    display: block;
    padding: 10px;
    border: 1px solid blue;
    margin: 5px 0;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/Sortable/1.4.2/Sortable.min.js"></script>

<foo id="sortable-1">
    <bar>foo 1</bar>
    <bar>foo 2</bar>
    <bar>foo 3</bar>
</foo>

<br/><br/>

<modu id="sortable-2">
    <module>modu 1</module>
    <module>modu 2</module>
    <module>modu 3</module>
</modu>

<br/><br/>

<modul id="sortable-3">
    <module>modul 1</module>
    <module>modul 2</module>
    <module>modul 3</module>
</modul>

<br/><br/>

<modules id="sortable-4">
    <module>modules 1</module>
    <module>modules 2</module>
    <module>modules 3</module>
</modules>

来源：https://stackoverflow.com/questions/33214810/make-custom-html-elements-droppable-in-iframe

标签

jquery

html

jquery-ui

iframe