在Safari iOS上拖放:不会拖动,不会响应桌面/ iPad上的掉落

Question

在Safari iOS上拖放:不会拖动,不会响应桌面/ iPad上的掉落

saz*_*azr 15 html javascript css safari drag-and-drop

我正在编写一个可在iPad上查看的网页.它使用Safaris/Webkits拖放.我已经完全复制了Safari的示例拖放代码,但它无法正常工作.

我的问题:当我在Safari桌面上或在iPad上的Safari上运行网页(HTML,CSS和Javascript)时,永远不会触发ondrop事件.在ipad上我甚至无法拖动元素(当我握住并将手指移到元素上时,显微镜会出现并且它不会拖动).拖动确实在桌面上工作.

出了什么问题？

可以在本页的最底部找到小代码示例:https://developer.apple.com/library/archive/documentation/AppleApplications/Conceptual/SafariJSProgTopics/DragAndDrop.html

<!DOCTYPE html>
<html>

<head>
  <title>Drag-and-Drop</title>

  <script>
    <!--
    var dragitem = undefined;

    function setdragitem(item, evt) {
      dragitem = item;
      // alert('item: '+item);
      // item is an HTML DIV element.
      // evt is an event.

      // If the item should not be draggable, enable this next line.
      // evt.preventDefault();

      return true;
    }

    function cleardragitem() {
      dragitem = undefined;
      // alert('item: '+item);
    }

    function dodrag() {
      // alert('item: '+dragitem);
    }

    // This is required---used to tell WebKit that the drag should
    // be allowed.
    function handledragenter(elt, evt) {
      evt.preventDefault();
      return true;
    }

    function handledragover(elt, evt) {
      evt.preventDefault();
      return true;
    }


    function handledragleave(elt, evt) {

    }

    function handledrop(elt, evt) {
      // alert('drop');
      dragitem.style.display = "none";
      var newid = dragitem.id + '_dest';
      var dest = document.getElementById(newid);
      dest.innerHTML = dragitem.innerHTML;
    }


    // -->
  </script>

  <style>
    <!-- .wordbox {
      border: 1px solid black;
      text-align: center;
      width: 50px;
      float: left;
      -webkit-user-drag: element;
      -webkit-user-select: none;
    }
    
    .spacer {
      clear: both;
    }
    
    .target {
      margin-top: 30px;
      padding: 30px;
      width: 70px;
      border: 1px solid black;
      background: #c0c0ff;
      margin-bottom: 30px;
      -webkit-user-drop: element;
    }
    
    .word {
      margin: 30px;
      min-height: 30px;
      border-bottom: 1px solid black;
      width: 50px;
      float: left;
    }
    
    -->
  </style>

</head>

<body>

  <p>Drop words onto target area to put them in their places.</p>

  <div class='wordbox' id='this' ondragstart='setdragitem(this, event);' ondrag='dodrag();' ondragend='cleardragitem();'>This</div>
  <div class='wordbox' id='is' ondragstart='setdragitem(this, event);' ondrag='dodrag();' ondragend='cleardragitem();'>is</div>
  <div class='wordbox' id='a' ondragstart='setdragitem(this, event);' ondrag='dodrag();' ondragend='cleardragitem();'>a</div>
  <div class='wordbox' id='test' ondragstart='setdragitem(this, event);' ondrag='dodrag();' ondragend='cleardragitem();'>test</div>

  <div class='spacer'></div>
  <div class='target' ondragenter='handledragenter(this, event);' ondragover='handledragover(this, event);' ondragleave='handledragleave(this, event);' ondrop='handledrop(this, event);'>TARGET</div>

  <div class='words'>
    <div class='word' id='this_dest'></div>
    <div class='word' id='is_dest'></div>
    <div class='word' id='a_dest'></div>
    <div class='word' id='test_dest'></div>
  </div>


</body>

</html>

Run Code Online (Sandbox Code Playgroud)

这是JSFiddle(记住拖放是Webkit所以只适用于Safari-这个网页仅适用于ipad):https://jsfiddle.net/eyM3y/