HTML5拖放教程 - 可排序列表

Question

有谁知道一个非常好的HTML5拖放教程？我正在制作一个待办事项列表,我希望能够使用此API对其进行重新排序/排序.我一直在谷歌搜索它像一个疯子,现在我开始放弃......欢迎任何提示!谢谢!

ps我真的想用html5拖放API,而不是jQuery-sortable()

Answer 1

我试图让这个样本尽可能简单.

如果您创建HTML列表:

<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>

...以及以下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;
}

...你应该得到一个可排序的列表.

您可以在https://codepen.io/askfinney/pen/qKXgap上尝试代码

请注意FireFox中的以下错误:https: //developer.mozilla.org/en-US/docs/Web/Events/dragenter

希望这可以帮助.

Answer 2

有关开始到结束的教程,请查看:http://taximeeting.tumblr.com/post/26539340142/lightweight-jquery-plugin-for-html5-sortable-lists.

它基于html5sortable:http://farhadi.ir/projects/html5sortable/.关于HTML5拖放的另一个很棒的教程可以在这里找到:http://www.html5rocks.com/en/tutorials/dnd/basics/.

Answer 3

如果您希望对表行执行此操作,则需要稍作更改:

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';
}