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让pre和textarea等HTML元素去掉滚动条自动换行自适应文本内容高度

 5 years ago
source link: https://www.tuicool.com/articles/aqAzuez
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HTML中pre和textarea可以显示预格式化的文本。即保留空格和换行符。而不必添加<br>和&nbsp;等HTML元素来添加换行和打印空格。

pre去掉滚动条

pre显示文本内容时是不会自动换行的，此时可以添加一些CSS来解决：

<pre>ourjs this is very very very very very very very very very very very very very very very logn contents.</pre>
pre {
    word-wrap: break-word;
    white-space: pre-wrap;

    padding: 9.5px;
    background-color: #f5f5f5;
    border: 1px solid #ccc;
}

textarea让高度自适应内容高度

textarea也能跟prev一样保留内容格式，但是元素高度是固定的，并且无法用CSS来调整。此时可以借助scrollHeight这个属性。

var textarea = document.getElementsByTagName('textarea')[0];
textarea.setAttribute('style','height:'+(textarea.scrollHeight + 12)+'px');

这里加了12px的padding。


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