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

Aug 11, 2018 pm 03:49 PM

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:

&lt;!DOCTYPE html&gt;
&lt;html lang=&quot;en&quot;&gt;

&lt;head&gt;
    &lt;meta charset=&quot;UTF-8&quot;&gt;
    &lt;meta name=&quot;viewport&quot; content=&quot;width=device-width, initial-scale=1.0&quot;&gt;
    &lt;meta http-equiv=&quot;X-UA-Compatible&quot; content=&quot;ie=edge&quot;&gt;
    &lt;title&gt;计算滚动条宽度&lt;/title&gt;
&lt;/head&gt;

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

&lt;/html&gt;

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