script.aculo.us 拖放遏制选项

此script.aculo.us 拖放包含选项用于创建元素数组。这必须是父级，并且放置区域只会接受那些，您可以将可拖动元素拖动到放置区域。在该放置区域中，如果 Containment 与您的可拖动元素的父级的 id 相同，则该元素将被放置。

句法：

Droppables.add('element', 
    {containment: element ID or array of parent's IDs}
);

价值观：

• ID：此选项采用元素 ID 或父 ID 数组。

示例：在此示例中，放置区域接受第二个图像，原因是第二个图像的 Containment 的父级如果 'gfg'。该父母的每个孩子都将被放置区域接受。

HTML

  

    
    
      
    
    
      
    
        window.onload = function () {
            $A($('draggables').getElementsByTagName('img'))
                .each(function (item) {
                    new Draggable(item, { 
                        revert: true, 
                        ghosting: true 
                    });
                });
  
            $A($('gfg').getElementsByTagName('img'))
                .each(function (item) {
                    new Draggable(item, { 
                        revert: true, 
                        ghosting: true 
                    });
                });
  
            Droppables.add('droparea', {
                 hoverclass: 'hoverActive', 
                 containment: 'gfg', 
                 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);
        }
    
  
    
        #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 
        Containment Option
    
      
    
        
    
    
  
    
        
    
  
    
    
        Drag the Image and Drop Your 
        Image in this area
    

  

输出：

• 拖放之前：

• 拖放后：