Javascript检测textarea中的滚动条 [英] Javascript detect scrollbar in textarea

问题描述

我想知道是否有人知道如何检测滚动条何时出现在 textarea 中。

I was wondering if anybody knows how I would go about detecting when the scrollbar appears inside a textarea.

我目前正在为我的JavaScript使用mootools，我在检测滚动条时遇到问题。

I am currently using mootools for my JavaScript and I am having issues getting it to detect a scrollbar.

推荐答案

function has_scrollbar(elem_id)
{
    const elem = document.getElementById(elem_id);
    if (elem.clientHeight < elem.scrollHeight)
        alert("The element has a vertical scrollbar!");
    else
        alert("The element doesn't have a vertical scrollbar.");
}

看到这个jsFiddle http://jsfiddle.net/qKNXH/

See this jsFiddle http://jsfiddle.net/qKNXH/

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