Ruby on Rails 中文本区域的最大长度 [英] Maximum length on a textarea in Ruby on Rails

问题描述

我尝试在 textarea<上应用 :maxlenght => 40/a> 在我的表格上.但它没有成功.我们可以对 textarea 设置长度限制吗?

I tried applying the :maxlenght => 40 on a textarea on my form. But it didn't work out. Can we have a length limit on a textarea?

文本区域的代码是

<%= f.text_area :data,
                :rows => 2,
                :cols => 60 ,
                :maxlength => 140,
                :autocomplete => :off,
                :class => "textareabytes" %>

推荐答案

就像 Rahul 说，HTML 中的 textarea 没有 maxlength 属性.只有 text input 有那个.

Just like Rahul said, there's no maxlength attribute for textarea in HTML. Only text input's have that.

您需要记住的是，RoR 的 text_area 函数(以及所有 RoR 的 HTML 生成器函数)接受您提供给它们的任何参数.如果他们不识别该参数，则将其转换为 HTML.

The thing you need to remember, is that RoR's text_area function (and all of RoR's HTML-generator functions) accept any argument you'll give them. If they don't recognized the parameter, then the'll just convert it to HTML.

<%=f.text_area :data, :hellothere => "hello to you too"%>

将输出此 HTML:

<textarea name="data" hellothere="hello to you too"></textarea>

我知道这很难记住，但 Ruby on Rails 并不神奇，它只是为您做了很多事情.诀窍是知道它是如何工作的，这样您就可以了解它们为什么起作用，以及在它们不起作用时如何修复它们！

I know it's hard to remember, but Ruby on Rails isn't magic, it just does a lot of things for you. The trick is to know how it does them, so you can understand why they work, and how to fix them when they don't!

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