问题
I have a textarea field where users can enter content. When it comes to displaying their entry on a page, rails returns \n for each line break, which appears as no break at all for html on the page.
From what I gather, the standard way of getting around this is a .gsub command, replacing \n with <br />, and then a .html_safe on the end to ensure the <br /> renders.
The problem is, I don't want to html_safe the content - html should still be replaced, but <br /> tags should be injected into the (non-escaped) content.
Suggestions appreciated.
回答1:
The simple_format method is good for formatting line breaks. It wraps text blocks in <p> tags, and converts newline characters into line breaks (<br>) (double newlines breaks the following text into a second paragraph).
It doesn't however escape other html characters, and instead just allows them. For what you're after a combination of simple_format along with sanitize should do nicely. Try using this:
<%=raw sanitize(simple_format(@article.body), :tags => %w(br p) ) %>
回答2:
If you want HTML tags entered in the text area visible, but still want line breaks to show, try this:
<%= simple_format(h @article.body) %>
The "h" quotes all the HTML special chars and "simple_format" then converts the line breaks to <br>.
回答3:
Depending on what you want to do, you can store the \n as it is, and then, when displaying the content on screen, use (h @comment.content).gsub("\n", '<br>'), which is to first escape all HTML tags, and then replace the \n with the <br>
回答4:
All this can be avoided by using <pre> tags. This has the advantage of preserving tabbing as well. eg
<pre><%= @article.body %></pre>
来源：https://stackoverflow.com/questions/4253689/parsing-newline-characters-in-textareas-without-allowing-all-html-tags