Tutorial for HTML5 drag&drop - sortable list

Question

Do anyone know a really good tutorial for HTML5 drag&drop? Im making a toDo-list and I want to be able to reorder/sort it with this API. I\'ve been googling for it like a ma

Answer 1

If you're going with the solution by adamf (Mar 10 '15 at 11:16), and want to use it on table rows, replace the dragenter function to the following:

function dragenter(e) {
    var target = e.target;
    while (target.parentNode.tagName != 'TBODY') {
        target = target.parentNode;
    }

    if (isbefore(source, target)) {
        target.parentNode.insertBefore(source, target);
    }
    else {
        target.parentNode.insertBefore(source, target.nextSibling);
    }
}

This way the target will only apply for TR elements, and not any of their child elements.

The same thing would apply for ul > li strunctures, if the li elements have children.

If there are img child elements, add a draggable="false" attribute to each.

Answer 2

I've tried to keep this sample as simple as possible.

If you create a HTML list:

<ul>
  <li draggable="true" ondragover="dragOver(event)" ondragstart="dragStart(event)">Apples</li>
  <li draggable="true" ondragover="dragOver(event)" ondragstart="dragStart(event)">Oranges</li>
  <li draggable="true" ondragover="dragOver(event)" ondragstart="dragStart(event)">Bananas</li>
  <li draggable="true" ondragover="dragOver(event)" ondragstart="dragStart(event)">Strawberries</li>
</ul>

...and the following javascript:

var _el;

function dragOver(e) {
  if (isBefore(_el, e.target))
    e.target.parentNode.insertBefore(_el, e.target);
  else
    e.target.parentNode.insertBefore(_el, e.target.nextSibling);
}

function dragStart(e) {
  e.dataTransfer.effectAllowed = "move";
  e.dataTransfer.setData("text/plain", null); // Thanks to bqlou for their comment.
  _el = e.target;
}

function isBefore(el1, el2) {
  if (el2.parentNode === el1.parentNode)
    for (var cur = el1.previousSibling; cur && cur.nodeType !== 9; cur = cur.previousSibling)
      if (cur === el2)
        return true;
  return false;
}

... you should get a sortable list.

You can try the code on https://codepen.io/crouchingtigerhiddenadam/pen/qKXgap

Please be aware of the following bug in FireFox: https://developer.mozilla.org/en-US/docs/Web/Events/dragenter

Hope this helps.

Answer 3

For a beginning to end tutorial, check this out: http://taximeeting.tumblr.com/post/26539340142/lightweight-jquery-plugin-for-html5-sortable-lists.

It's based on html5sortable: http://farhadi.ir/projects/html5sortable/. Another great tutorial on HTML5's drag and drop can be found here: http://www.html5rocks.com/en/tutorials/dnd/basics/.

Answer 4

If you are looking to do this with table rows you need to make a slight change:

https://jsfiddle.net/cmpenney/6rx6u2kf/

<table>
    <tr draggable="true" ondragenter="dragenter(event)" ondragstart="dragstart(event)">
        <td style="border: 1px solid black">Apples</td>
        <td style="border: 1px solid black">A-Column2</td>
    </tr>
    <tr draggable="true" ondragenter="dragenter(event)" ondragstart="dragstart(event)">
        <td style="border: 1px solid black">Oranges</td>
        <td style="border: 1px solid black">O-Column2</td>
    </tr>
    <tr draggable="true" ondragenter="dragenter(event)" ondragstart="dragstart(event)">
        <td style="border: 1px solid black">Bananas</td>
        <td style="border: 1px solid black">B-Column2</td>
    </tr>
    <tr draggable="true" ondragenter="dragenter(event)" ondragstart="dragstart(event)">
        <td style="border: 1px solid black">Strawberries</td>
        <td style="border: 1px solid black">S-Column2</td>
    </tr>
</table>



var source;

function isbefore(a, b) {
    if (a.parentNode == b.parentNode) {
        for (var cur = a; cur; cur = cur.previousSibling) {
            if (cur === b) {
                return true;
            }
        }
    }
    return false;
}

function dragenter(e) {
    var targetelem = e.target;
    if (targetelem.nodeName == "TD") {
       targetelem = targetelem.parentNode;   
    }  

    if (isbefore(source, targetelem)) {
        targetelem.parentNode.insertBefore(source, targetelem);
    } else {
        targetelem.parentNode.insertBefore(source, targetelem.nextSibling);
    }
}

function dragstart(e) {
    source = e.target;
    e.dataTransfer.effectAllowed = 'move';
}