How to get the scroll bar width in js (code example)-JS Tutorial-php.cn

How to get the scroll bar width in js (code example)

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Release： 2018-08-11 15:49:00

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The content of this article is about how to obtain the scroll bar width in js (code example). It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

Idea: By creating an element, do not set a border for the element, then set overflowY:scroll for the element, and then calculate the scroll bar width based on the element's offsetWidth-clientWidth.

Code:

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>计算滚动条宽度</title>
</head>

<body>
    <script>
        // 封装获取滚动条宽度的方法
        function getScrollBarWidth() {
            var el = document.createElement("p"),
                styles = {
                    width: "100px",
                    height: "100px",
                    overflowY: "scroll"
                },
                i;

            // 这里很巧妙呀，先定义了一个styles对象，里面写了各种样式值，然后通过for in将这个对象的值赋给p元素的style对象
            // 而不用通过style.width=***等来给p的样式对象赋值。
            for (i in styles) {
                el.style[i] = styles[i];
            }

            // 将元素加到body里面
            document.body.appendChild(el);

            var scrollBarWidth = el.offsetWidth - el.clientWidth;
            //将添加的元素删除
            el.remove();
            return scrollBarWidth;
        }

        console.log(getScrollBarWidth()); // 注意这里imac得到的结果为0，因为imac的滚动条是没有宽度的。
    </script>
</body>

</html>

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