script.aculo.us 拖放 onDrop 选项

这个 script.aculo.us拖放 onDrop 选项用于调用回调函数，当合适的可拖动元素被拖放到放置目标上并且目标接受它时调用该回调函数。

句法：

Droppables.add('element', 
    {onDrop: 'callbackFunction'}
);

价值观：

• 函数：此选项采用回调函数。

例子：

HTML

  

    
    
      
    
    
      
    
        window.onload = function () {
            $A($('draggables').getElementsByTagName('img'))
                .each(function (item) {
                    new Draggable(item, { 
                        revert: true, 
                        ghosting: true 
                    });
                });
  
            Droppables.add('droparea', { 
                hoverclass: 'hoverActive', 
                onDrop: moveItem 
            });
              
            // Set drop area default non cleared.
            $('droparea').cleared = false;
        }
  
        function moveItem(draggable, droparea) {
            if (!droparea.cleared) {
                droparea.innerHTML = '';
                droparea.cleared = true;
            }
  
            draggable.parentNode.removeChild(draggable);
            droparea.appendChild(draggable);
            alert("Image dropped successully")
        }
    
  
    
        #draggables {
            width: 550px;
            height: 73px;
        }
  
        #gfg {
            width: 550px;
            height: 73px;
        }
  
        #droparea {
            float: left;
            width: 650px;
            height: 90px;
            border: 2px solid gray;
            text-align: center;
            font-size: 16px;
            padding: 12px;
        }
    

  

    
        
            GeeksforGeeks
        
  
        A Computer Science Portal for Geeks
    
  
    
        script.aculo.us Drag & Drop 
        onDrop Option
    
      
    
        
    
      
    
    
        Drag the Image and Drop Your 
        Image in this area
    

  

输出：您可以看到成功删除图像后显示的警报。