div边框拖拽改变宽度

r囧r小猫 2023-10-06 21:58 2阅读 0赞

css盒子如下图：

![8cd51f258a9f76172975385572da29a1.png][]

**注意：**

刚开始测试效果不是很好，原因**行内块元素之间有缝隙**

消除行内块元素左右之间的间隙:**给父元素设置为弹性布局flex**

<!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>Title</title>
        <style>
            .box {
                width: 90%;
                height: 90vh;
                border: solid 1px black;
                display: flex; /*消除行内块元素左右之间的间隙:给父元素设置为弹性布局*/
            }
    
            .left {
                width: 49%;
                height: 100%;
                background: lightgrey;
                float: left;
            }
    
            .resize {
                width: 2%;
                height: 100%;
                background-color: orange;
                cursor: w-resize;
                float: left;
            }
    
            .right {
                width: 49%;
                height: 100%;
                background: lightgrey;
                float: left;
            }
        </style>
    </head>
    <body>
    <div>
        <div class="box" id="box">
            <div class="left" id="left">左边</div>
            <div class="resize" id="resize"></div>
            <div class="right" id="right">右边</div>
        </div>
    </div>
    
    <script>
        window.onload = function () {
            let box = document.getElementById('box');
            let left = document.getElementById('left');
            let resize = document.getElementById('resize');
            let right = document.getElementById('right');
    
            let w = box.offsetWidth;//获取 div 元素的宽度，包含内边距（padding）和边框（border）
            let rw = resize.offsetWidth;//获取 div 元素的宽度，包含内边距（padding）和边框（border）
    
            //按下鼠标事件
            resize.onmousedown = function (e) {
                let startX = e.clientX;//鼠标指针的水平坐标
                resize.left = resize.offsetLeft;//分割线节点元素的左边界的偏移值
                // 鼠标拖动事件
                document.onmousemove = function (e) {
                    let change = e.clientX - startX;//鼠标移动的偏移值
                    let moveLen = resize.left + change;//鼠标移动后，分割线节点元素的左边界的偏移值
                    resize.style.left = moveLen;
                    left.style.width = moveLen + 'px';
                    right.style.width = (w - moveLen - rw) + 'px';// 容器宽度 - 左边区域的宽度 - 分割线的宽度 = 右边区域的宽度
                }
                // 鼠标松开事件
                document.onmouseup = function (evt) {
                    evt.stopPropagation();
                    document.onmousemove = null;
                    document.onmouseup = null;
                    //当你不在需要继续获得鼠标消息就要应该调用ReleaseCapture()释放掉
                    resize.releaseCapture && resize.releaseCapture();
                }
                //该函数在属于当前线程的指定窗口里设置鼠标捕获
                resize.setCapture && resize.setCapture();
                //对于上面出现的setCapture()和releaseCapture()的用法。必须成对出现。
            }
        }
    </script>
    </body>
    </html>

![9e9ebba596dd457884e384885c2f9e4b.gif][]

jquey方式

注意：鼠标按下才开始记录坐标值。

<!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>Title</title>
        <script src="http://libs.baidu.com/jquery/1.9.1/jquery.min.js"></script>
        <style>
            body {
                padding: 20px;
            }
    
            th, td {
                width: 100px;
            }
    
            .drag-1 {
                display: inline-block;
                border-left: 3px solid red;
                height: 25px;
                position: fixed;
                left: 130px;
                cursor: w-resize;
            }
    
            .drag-2 {
                display: inline-block;
                border-left: 3px solid red;
                height: 25px;
                position: absolute;
                left: 233px;
                cursor: w-resize;
            }
        </style>
    </head>
    <body>
    <div>
        <div class="drag-1"></div>
        <div class="drag-2"></div>
        <table border="1" style="border-collapse: collapse;">
            <thead>
            <tr>
                <th class="col-1">表头1</th>
                <th class="col-2">表头2</th>
                <th class="col-3">表头3</th>
            </tr>
            </thead>
            <tbody>
            <tr>
                <td class="col-1">数据1</td>
                <td class="col-2">数据2</td>
                <td class="col-3">数据3</td>
            </tr>
            <tr>
                <td class="col-1">数据1</td>
                <td class="col-2">数据2</td>
                <td class="col-3">数据3</td>
            </tr>
            </tbody>
        </table>
    </div>
    
    <script>
        $(function () {
            drag1();
            drag2();
        });
    
        function drag1() {
            let resize = document.getElementsByClassName('drag-1')[0];
            //按下鼠标事件
            resize.onmousedown = function (e) {
                let startX = e.clientX;//鼠标指针的水平坐标
                let drag_1 = $('.drag-1').offset().left;
                let drag_2 = $('.drag-2').offset().left;
                let col_1 = $('.col-1').width();
                // 鼠标拖动事件
                document.onmousemove = function (e) {
                    let change = e.clientX - startX;//鼠标移动的偏移值
                    $('.drag-1').offset({'left': drag_1 + change})
                    $('.drag-2').offset({'left': drag_2 + change})
                    $('.col-1').width(col_1 + change);
                }
                // 鼠标松开事件
                document.onmouseup = function (evt) {
                    evt.stopPropagation();
                    document.onmousemove = null;
                    document.onmouseup = null;
                    //当你不在需要继续获得鼠标消息就要应该调用ReleaseCapture()释放掉
                    resize.releaseCapture && resize.releaseCapture();
                }
                //该函数在属于当前线程的指定窗口里设置鼠标捕获
                resize.setCapture && resize.setCapture();
                //对于上面出现的setCapture()和releaseCapture()的用法。必须成对出现。
            }
        }
    
        function drag2() {
            let resize = document.getElementsByClassName('drag-2')[0];
            //按下鼠标事件
            resize.onmousedown = function (e) {
                let startX = e.clientX;//鼠标指针的水平坐标
                let drag_2 = $('.drag-2').offset().left;
                let col_2 = $('.col-2').width();
                // 鼠标拖动事件
                document.onmousemove = function (e) {
                    let change = e.clientX - startX;//鼠标移动的偏移值
                    $('.drag-2').offset({'left': drag_2 + change})
                    $('.col-2').width(col_2 + change);
                }
                // 鼠标松开事件
                document.onmouseup = function (evt) {
                    evt.stopPropagation();
                    document.onmousemove = null;
                    document.onmouseup = null;
                    //当你不在需要继续获得鼠标消息就要应该调用ReleaseCapture()释放掉
                    resize.releaseCapture && resize.releaseCapture();
                }
                //该函数在属于当前线程的指定窗口里设置鼠标捕获
                resize.setCapture && resize.setCapture();
                //对于上面出现的setCapture()和releaseCapture()的用法。必须成对出现。
            }
        }
    
    </script>
    </body>
    </html>

![5dc7748e160f4a16ae5eb61b93b52c01.gif][]

[8cd51f258a9f76172975385572da29a1.png]: https://img-blog.csdnimg.cn/img_convert/8cd51f258a9f76172975385572da29a1.png
[9e9ebba596dd457884e384885c2f9e4b.gif]: https://img-blog.csdnimg.cn/9e9ebba596dd457884e384885c2f9e4b.gif
[5dc7748e160f4a16ae5eb61b93b52c01.gif]: https://img-blog.csdnimg.cn/5dc7748e160f4a16ae5eb61b93b52c01.gif