CSS Flex div随着子textarea的增长而增长(无jquery)

问题描述

想象一下我有以下

div{
  padding: 20px;
}

<div style="display:flex; background: gold; flex-direction: column;">
  <textarea>Do NOT expand this</textarea>
  <textarea class="expand">Expand this baby</textarea>

</div>

我想在textarea上的内容展开"为其扩展父div时产生垂直溢出，而不创建垂直滚动.

I want when content on textarea "expand" creates vertical overflow for it to expand parent div, not to create vertical scroll.

推荐答案

我认为仅靠CSS不能做到这一点，而且由于您不想要jQuery，所以这里是一个纯JS解决方案.这个想法是在每次更新内容时计算文本区域的高度(调整大小)

I think this cannot be done with only CSS, and since you don't want a jQuery one, so here is a pure JS solution. The idea is to calculate the height (resize) the textarea each time you update the content

var tex = document.querySelector('textarea.expand');

tex.addEventListener('keydown', resize);

function resize() {
  setTimeout(function() {
    tex.style.height = 'auto'; //needed when you remove content so we reduce the height
    tex.style.height = tex.scrollHeight + 'px';
  }, 0);
}

div {
  padding: 20px;
}

<div style="display:flex; background: gold; flex-direction: column;">
  <textarea>Do NOT expand this</textarea>
  <textarea class="expand">Expand this baby</textarea>
</div>

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