最佳做法：显示通过多行文本框输入的文本

问题描述

我有一个多行文本框。当用户输入时，文本框会将文本包装起来，并保存为一行。用户可能会输入换行符，例如当输入一个项目符号列表时：

 这里有一些建议： 
  - 修复此
  - 移除
  - 另一件事
  

现在，当我尝试显示此字段的值时，就会出现问题。为了保持格式化，我现在将演示文稿包装在< pre> 中 - 这可以保留用户提供的中断，但是当有大量文本保存为单行，它将整个文本块显示为单行，导致需要水平滚动来查看所有内容。

是否有一种优雅的方式来处理这两种情况？

解决方案

处理这个问题的最简单方法是将所有换行符 \\\
转换为< br> 换行符。以PHP为例，这是通过使用 nl2br（）函数完成的。

如果你想要一些更加奇特的东西 - 比如你引用的列表被转换成一个实际的HTML < ul>



 ＃标题1 
 ##标题2 
 ###标题3 
 
 *无序列表项目
 *无序列表项目
 
 1.编号列表项目
 2.编号列表项目
  code> 

etc ....

I have a multi-line text box. When users simply type away, the text box wraps the text, and it's saved as a single line. It's also possible that users may enter line breaks, for example when entering a "bulleted" lists like:

Here are some suggestions:
 - fix this
 - remove that
 - and another thing

Now, the problem occurs when I try to display the value of this field. In order to preserve the formatting, I currently wrap the presentation in <pre> - this works to preserve user-supplied breaks, but when there's a lot of text saved as a single line, it displays the whole text block as single line, resulting in horizontal scrolling being needed to see everything.

Is there a graceful way to handle both of these cases?

解决方案

The easiest way of dealing with this is turning all line breaks \n into <br> line breaks. In PHP for example, this is done using the nl2br() function.

If you want something a bit more fancy - like the list you quote getting converted into an actual HTML <ul> for example - you could consider a simple "language" like Markdown that SO uses. It comes with natural, simple rules like

# Heading 1
## Heading 2
### Heading 3

* Unordered List item
* Unordered List item

1. Numbered List item
2. Numbered List item

etc....

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