javascript - 通过滚动移动 DIV

Question

我正在创建一个 jQuery 滚动条，它滚动

中的内容。有点像 jQuery ScrollPane .

我已经到了需要移动滚动按钮的地步。我的问题是:没有任何 UI 插件的最佳方法是什么？因此，当用户单击滚动按钮时，它可以通过 mousedown 事件在其父容器中垂直移动。我怎么能那样做？

最佳答案

这是一个起点，希望这就是您所追求的:

$(function() {
    $('.slider').slider();
});

$.fn.slider = function() {
    return this.each(function() {
        var $el = $(this);
        $el.css('top', 0);
        var dragging = false;
        var startY = 0;
        var startT = 0;
        $el.mousedown(function(ev) {
            dragging = true;
            startY = ev.clientY;
            startT = $el.css('top');
        });
        $(window).mousemove(function(ev) {
            if (dragging) {
                // calculate new top
                var newTop = parseInt(startT) + (ev.clientY - startY);
                
                //stay in parent
                var maxTop =  $el.parent().height()-$el.height();          
                newTop = newTop<0?0:newTop>maxTop?maxTop:newTop;
                $el.css('top', newTop );
            }
        }).mouseup(function() {
            dragging = false;
        });
    });
}

.container{
    position:relative;
    border:1px solid red;
    height:100px;
}
.slider{
    height:20px;
    width:20px;
    background:green; 
    position:absolute;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div>
  <div class="container">
    <div class="slider" />
  </div>
</div>
<br/>
<div class="container">
  <div class="slider" />
</div>

关于javascript - 通过滚动移动 DIV，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/6610388/

Answer 1

这是一个起点，希望这就是您所追求的:

$(function() {
    $('.slider').slider();
});

$.fn.slider = function() {
    return this.each(function() {
        var $el = $(this);
        $el.css('top', 0);
        var dragging = false;
        var startY = 0;
        var startT = 0;
        $el.mousedown(function(ev) {
            dragging = true;
            startY = ev.clientY;
            startT = $el.css('top');
        });
        $(window).mousemove(function(ev) {
            if (dragging) {
                // calculate new top
                var newTop = parseInt(startT) + (ev.clientY - startY);
                
                //stay in parent
                var maxTop =  $el.parent().height()-$el.height();          
                newTop = newTop<0?0:newTop>maxTop?maxTop:newTop;
                $el.css('top', newTop );
            }
        }).mouseup(function() {
            dragging = false;
        });
    });
}

.container{
    position:relative;
    border:1px solid red;
    height:100px;
}
.slider{
    height:20px;
    width:20px;
    background:green; 
    position:absolute;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div>
  <div class="container">
    <div class="slider" />
  </div>
</div>
<br/>
<div class="container">
  <div class="slider" />
</div>