拖动元素时滚动div而不移动鼠标

Question

我开发了一个代码,包括一个表,其所有单元格都是可放置的.表容器是div,具有固定高度和滚动条.

我想将一个元素(在我的例子中为黄色方块)拖到我桌子底部的最后一个表格单元格中.一切正常,但是当我拖动元素时激活我的div容器的滚动条,我必须一直移动鼠标.

当我的元素在我的div容器底部附近拖动而不移动鼠标时,是否有可能自动向下滚动？

这是我的例子:http://jsbin.com/upunek/19/edit

提前致谢

Answer 1

我今天早上弄清楚了.

setInterval当拖动事件位置位于边框的70px 时,我创建了函数

这是我制作的小提琴:http://jsfiddle.net/pPn3v/22/

var yellow = $('#yellow');
var offset = yellow.offset();
var offsetWidth = offset.left + yellow.width();
var offsetHeight = offset.top + yellow.height();

var red = $('#red');

var intRightHandler = null;
var intLeftHandler = null;
var intTopHandler= null;
var intBottomHandler= null;
var distance = 70;
var timer = 100;
var step = 10;


function clearInetervals()
{
    clearInterval(intRightHandler);
    clearInterval(intLeftHandler);
    clearInterval(intTopHandler);
    clearInterval(intBottomHandler);    
}

red.draggable({
    start : function(){},
    stop: function(){clearInetervals(); },    
    drag : function(e){
        var isMoving = false;        
        //Left
        if((e.pageX - offset.left) <= distance)
        {
            isMoving = true;
            clearInetervals();            
            intLeftHandler= setInterval(function(){
                yellow.scrollLeft(yellow.scrollLeft() - step)
            },timer);
            console.log('left')
        }

        //Right
        if(e.pageX >= (offsetWidth - distance))
        {
            isMoving = true;
            clearInetervals();            
            intRightHandler = setInterval(function(){
                yellow.scrollLeft(yellow.scrollLeft() + step)
            },timer);
            console.log('right')
        }

        //Top
        if((e.pageY - offset.top) <= distance)
        {
            isMoving = true;
            clearInetervals();            
            intTopHandler= setInterval(function(){
                yellow.scrollTop(yellow.scrollTop() - step)
            },timer);
            console.log('top')
        }                          

        //Bottom
        if(e.pageY >= (offsetHeight - distance))
        {
            isMoving = true;
            clearInetervals();            
            intBottomHandler= setInterval(function(){
                yellow.scrollTop(yellow.scrollTop() + step)
            },timer);
            console.log('bottom')
        }     

        //No events
        if(!isMoving)
           clearInetervals();  
    }
});

​