在边框拖放时调整 div 大小，无需添加额外标记

问题描述 投票：0回答：4

我有一个绝对定位的侧面板，我需要通过拖动此边框来更改其宽度。我还需要更改边框悬停上的光标。是否可以在不添加另一个 div 进行拖动的情况下做到这一点？

这是标记：

#right_panel {
    position: absolute;
    border-left: solid 3px #ccc;
    width: 100px;
    height: 100%;
    right: 0;
    background-color: #f0f0f0;
}
<body>
    <div id="right_panel"></div>
</body>

我不需要完整的解决方案。答 是（有文档参考）/否答案就足够了。我不需要助手的回答

div
。我已经有一个了：

var m_pos;
function resize(e){
    var parent = resize_el.parentNode;
    var dx = m_pos - e.x;
    m_pos = e.x;
    parent.style.width = (parseInt(getComputedStyle(parent, '').width) + dx) + "px";
}

var resize_el = document.getElementById("resize");
resize_el.addEventListener("mousedown", function(e){
    m_pos = e.x;
    document.addEventListener("mousemove", resize, false);
}, false);
document.addEventListener("mouseup", function(){
    document.removeEventListener("mousemove", resize, false);
}, false);
#right_panel {
    position: absolute;
    width: 96px;
    padding-left: 4px;
    height: 100%;
    right: 0;
    background-color: #f0f0f0;
}

#resize {
    background-color: #ccc;
    position: absolute;
    left: 0;
    width: 4px;
    height: 100%;
    cursor: w-resize;
}
<body>
    <div id="right_panel">
        <div id="resize"></div>
    </div>
</body>

这又是我想要的功能，只是我想删除多余的

div
。

javascript html css
4个回答
124
投票

当然可以在没有额外 div 的情况下做到这一点。使用 css 和 

::after
创建边框并更改光标。使用 
MouseEvent.offsetX
 来确定是否处理元素中的单击。

在您的示例中，您希望单击主 div，但仅单击前 4 个像素。您可以通过在点击处理程序中检查 

e.offsetX < 4
来做到这一点：

const BORDER_SIZE = 4;
const panel = document.getElementById("right_panel");

let m_pos;
function resize(e){
  const dx = m_pos - e.x;
  m_pos = e.x;
  panel.style.width = (parseInt(getComputedStyle(panel, '').width) + dx) + "px";
}

panel.addEventListener("mousedown", function(e){
  if (e.offsetX < BORDER_SIZE) {
    m_pos = e.x;
    document.addEventListener("mousemove", resize, false);
  }
}, false);

document.addEventListener("mouseup", function(){
    document.removeEventListener("mousemove", resize, false);
}, false);
#right_panel {
    position: absolute;
    width: 96px;
    padding-left: 4px;
    height: 100%;
    right: 0;
    background-color: #f0f0ff;
}

#right_panel::after {
    content: '';
    background-color: #ccc;
    position: absolute;
    left: 0;
    width: 4px;
    height: 100%;
    cursor: ew-resize;
}
<body>
    <div id="right_panel"></div>
</body>

31
投票

jQuery 解决方案

希望对你有帮助

http://jsfiddle.net/T4St6/82/

var isResizing = false,
        lastDownX = 0;
    
    $(function () {
        var container = $('#container'),
            left = $('#left_panel'),
            right = $('#right_panel'),
            handle = $('#drag');
    
        handle.on('mousedown', function (e) {
            isResizing = true;
            lastDownX = e.clientX;
        });
    
        $(document).on('mousemove', function (e) {
            // we don't want to do anything if we aren't resizing.
            if (!isResizing) 
                return;
            
            var offsetRight = container.width() - (e.clientX - container.offset().left);
    
            left.css('right', offsetRight);
            right.css('width', offsetRight);
        }).on('mouseup', function (e) {
            // stop resizing
            isResizing = false;
        });
    });
body, html {
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
}

#container {
    width: 100%;
    height: 100%;

}

#left_panel {
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    right: 100px;
    background: grey;
}

#right_panel {
    position: absolute;
    right: 0;
    top: 0;
    bottom: 0;
    width: 200px;
    color:#fff;
    background: black;
}

#drag {
    position: absolute;
    left: -4px;
    top: 0;
    bottom: 0;
    width: 8px;
    cursor: w-resize;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.7.1/jquery.min.js"></script>
<div id="container">
    <div id="left_panel"> left content! </div>
    <div id="right_panel">
        <div id="drag"></div> right content!
    </div>
</div>

19
投票

没有 jQuery：

var isResizing = false;

(function() {
  var container = document.getElementById("container"),
    left = document.getElementById("left_panel"),
    right = document.getElementById("right_panel"),
    handle = document.getElementById("drag");

  handle.onmousedown = function(e) {
    isResizing = true;
  };

  document.onmousemove = function(e) {
    // we don't want to do anything if we aren't resizing.
    if (!isResizing) {
      return;
    }

    var offsetRight = container.clientWidth - (e.clientX - container.offsetLeft);

    left.style.right = offsetRight + "px";
    right.style.width = offsetRight + "px";
  }

  document.onmouseup = function(e) {
    // stop resizing
    isResizing = false;
  }
})();
body {
  font-family: Helvetica, Arial;
  font-size: 12px;
}

body,
html {
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0;
}

#container {
  width: 100%;
  height: 100%;
}

#left_panel {
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  right: 100px;
  background: grey;
}

#right_panel {
  position: absolute;
  right: 0;
  top: 0;
  bottom: 0;
  width: 200px;
  color: #fff;
  background: black;
}

#drag {
  position: absolute;
  left: -4px;
  top: 0;
  bottom: 0;
  width: 8px;
  cursor: w-resize;
}
<body>
  <div id="container">
    <div id="left_panel"> left content! </div>
    <div id="right_panel">
      <div id="drag"></div> right content!
    </div>
  </div>
</body>

11
投票

2022 答案：
现在可以通过简单地使用 css 中的“resize”属性来完成，
确保该 div 自动溢出，这样调整大小就可以了。

如本片段所示：

#right_panel {
    position: absolute;
    border-left: solid 3px #ccc;
    width: 100px;
    height: 100%;
    right: 0;
    background-color: #f0f0f0;
    resize: horizontal;
    overflow-x: auto;
  }
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