HTML5 drag and copy?

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I\'ve seen some working code for HTML5 drag and drop but has anyone an example of a drag and copy? I want to drag an element onto a drop element but only copy the element to

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遇见更好的自我

2020-12-08 07:35

I will stick to the example shown here: http://www.w3schools.com/html/html5_draganddrop.asp

Assuming we have this document:

<!DOCTYPE HTML>
<html>
 <head>
  <script>
    <!-- script comes in the text below -->
  </script>
 </head>
 <body>

  <div id="div1" ondrop="drop(event)"
  ondragover="allowDrop(event)"></div>

  <img id="drag1" src="img_logo.gif" draggable="true"
  ondragstart="drag(event)" width="336" height="69">

 </body>
</html>

Normal Drag & Drop

Normal drag and drop has such functions assigned to the respective elements:

function allowDrop(ev) {
  /* The default handling is to not allow dropping elements. */
  /* Here we allow it by preventing the default behaviour. */
  ev.preventDefault();
}

function drag(ev) {
  /* Here is specified what should be dragged. */
  /* This data will be dropped at the place where the mouse button is released */
  /* Here, we want to drag the element itself, so we set it's ID. */
  ev.dataTransfer.setData("text/html", ev.target.id);
}

function drop(ev) {
  /* The default handling is not to process a drop action and hand it to the next 
     higher html element in your DOM. */
  /* Here, we prevent the default behaviour in order to process the event within 
     this handler and to stop further propagation of the event. */
  ev.preventDefault();
  /* In the drag event, we set the *variable* (it is not a variable name but a 
     format, please check the reference!) "text/html", now we read it out */
  var data=ev.dataTransfer.getData("text/html");
  /* As we put the ID of the source element into this variable, we can now use 
     this ID to manipulate the dragged element as we wish. */
  /* Let's just move it through the DOM and append it here */
  ev.target.appendChild(document.getElementById(data));
}

Drag & Copy

Whereas you'll have to alter the drop function so that it copies the DOM element instead of moving it.

/* other functions stay the same */

function drop(ev) {
  ev.preventDefault();
  var data=ev.dataTransfer.getData("text/html");
  /* If you use DOM manipulation functions, their default behaviour it not to 
     copy but to alter and move elements. By appending a ".cloneNode(true)", 
     you will not move the original element, but create a copy. */
  var nodeCopy = document.getElementById(data).cloneNode(true);
  nodeCopy.id = "newId"; /* We cannot use the same ID */
  ev.target.appendChild(nodeCopy);
}

Try this page: http://www.w3schools.com/html/tryit.asp?filename=tryhtml5_draganddrop
And then append a .cloneNode(true) to getElementById(data).

Switch between Copy & Paste

You could even do things like in file managers: Ctrl-Key switches from moving to copying:

function drop(ev) {
  ev.preventDefault();
  var data=ev.dataTransfer.getData("text/html");
  /* Within a Mouse event you can even check the status of some Keyboard-Buttons
     such as CTRL, ALT, SHIFT. */
  if (ev.ctrlKey)
  {
    var nodeCopy = document.getElementById(data).cloneNode(true);
    nodeCopy.id = "newId"; /* We cannot use the same ID */
    ev.target.appendChild(nodeCopy);
  }
  else
    ev.target.appendChild(document.getElementById(data));
}

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天命终不由人

2020-12-08 07:39
If you wanted an example using JQuery I have provided this jsFiddle. Essentially you just need to bind to the drop, dragover and dropstart events for the DOM objects. You can then use JQuery's build in clone() method to duplicate the element.

JQuery also returns it's own events wrapper so you must get the originalevent from the JQuery event
```
$('#x').bind('dragstart', function(e) {
    e.originalEvent.dataTransfer.effectAllowed = 'copy';
    e.originalEvent.dataTransfer.setData('Text', '#x');
});

$('#drop-box').bind('drop', function(e) {
    e.preventDefault();
    e.stopPropagation();

    $(this).html($(e.originalEvent.dataTransfer.getData('Text')).clone());

    return false;
}).bind('dragover', false);
```
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