HTML5原生拖放图像，而不是边框

HTML5 Native drag and drop on image as opposed to border?

本文关键字：边框 原生 拖放 图像 HTML5      更新时间：2023-09-26

我已经对一组图像实现了拖放功能。我遇到的问题是，它只工作，当我从图片边界不是图片本身拖动??

我试过各种各样的东西，但似乎不起作用。如果我把图片放到不合适的位置，它也会变成一个裁剪框。

<script type="text/javascript">
var source;
function dragStarted(evt){
//start drag
source=evt.target;
//set data
evt.dataTransfer.setData("image/jpeg", evt.target.innerHTML);
//specify allowed transfer
evt.dataTransfer.effectAllowed = "move";
}

function draggingOver(evt){
//drag over
evt.preventDefault();
//specify operation
evt.dataTransfer.dropEffect = "move";
}
function dropped(evt){
//drop
evt.preventDefault();
evt.stopPropagation();
//update text in dragged item
source.innerHTML = evt.target.innerHTML;
//update text in drop target
 evt.target.innerHTML = evt.dataTransfer.getData("image/jpeg");
}
</script>

<ul class="photos columns-3">
<li draggable="true" ondragstart="dragStarted(event)" ondragover="draggingOver(event)" ondrop="dropped(event)"><img src="images/dsc_6001.jpg" width="200" height="200"/></li>
<li draggable="true" ondragstart="dragStarted(event)" ondragover="draggingOver(event)" ondrop="dropped(event)"><img src="images/dsc_6013.jpg" width="200" height="200"/></li>
<li draggable="true" ondragstart="dragStarted(event)" ondragover="draggingOver(event)" ondrop="dropped(event)"><img src="images/dsc_6081.jpg" width="200" height="200"/></li>
<li draggable="true" ondragstart="dragStarted(event)" ondragover="draggingOver(event)" ondrop="dropped(event)"><img src="images/dsc_6268.jpg" width="200" height="200"/></li>
<li draggable="true" ondragstart="dragStarted(event)" ondragover="draggingOver(event)" ondrop="dropped(event)"><img src="images/dsc_6345.jpg" width="200" height="200"/></li>
<li draggable="true" ondragstart="dragStarted(event)" ondragover="draggingOver(event)" ondrop="dropped(event)"><img src="images/dsc_6378.jpg" width="200" height="200"/></li>
<li draggable="true" ondragstart="dragStarted(event)" ondragover="draggingOver(event)" ondrop="dropped(event)"><img src="images/dsc_6397.jpg" width="200" height="200"/></li>
<li draggable="true" ondragstart="dragStarted(event)" ondragover="draggingOver(event)" ondrop="dropped(event)"><img src="images/dsc_6413.jpg" width="200" height="200"/></li>
    <li draggable="true" ondragstart="dragStarted(event)" ondragover="draggingOver(event)"     ondrop="dropped(event)"><img src="images/dsc_6417.jpg" width="200" height="200"/></li>
   </ul>

实际上，当你将鼠标指针放在图像上时，它正在考虑图像事件并且你已经完成了li标签

的代码

你可以试着修改下面的代码:

var source,imgsrc;
dragStarted = function (evt){
    //start drag
    source=evt.target;
    if(evt.target.tagName == "IMG" ) {
        source=evt.target.parentNode;
        imgsrc=source;
    }
    //set data
    evt.dataTransfer.setData("image/jpeg", source.innerHTML);
    //specify allowed transfer
    evt.dataTransfer.effectAllowed = "move";
}

draggingOver = function (evt){
    //drag over
    evt.preventDefault();
    //specify operation
    evt.dataTransfer.dropEffect = "move";
}
dropped = function (evt){
    //drop
    evt.preventDefault();
    evt.stopPropagation();
    imgsrc=evt.target;
    if(evt.target.tagName == 'IMG' ) {
        imgsrc=evt.target.parentNode;
    }
    //update text in dragged item
    source.innerHTML = imgsrc.innerHTML;
    //update text in drop target
     imgsrc.innerHTML = evt.dataTransfer.getData("image/jpeg");
}
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