表格多选 [英] form multiple select

问题描述

我正在学习 Rails，并且已经为此苦苦挣扎了一天多，无法弄清楚如何让它发挥作用.我想要一个可以选择多个元素的表单中的选择框.我用这个代码工作:

<%= f.label :products%><br/><%= f.select :products, {"A"=>1, "B"=>2, "C"=>3, "D"=>4},{},:size=>5,:multiple=>true%>

这可以正常工作并生成此 HTML:

<label for="script_products">产品</label><br/><select id="script_products" multiple="multiple" name="script[products][]" size="5"><option value="1">A</option><option value="2">B</option><option value="3">C</option><option value="4">D</option></select>

我能弄清楚的是如何发送/存储结果.在我看来，显示"操作，如果我只是打印出 :products 我会得到这个:

产品:--- - '1' - '2' - '3'

如果我打印:products.inspect，我会得到这个:

产品:"---\n- '1'\n- '2'\n- '3'\n"

并且类是一个字符串.我认为它会存储为一个数组，但我无法让它工作.我不知道破折号或换行符从何而来.

解决方案

我会考虑将选项添加为模型上的多个关系.因此，您可以遍历它们，附加它们并以(IMO)更好的方式将它们包含在多重选择中.

我会在我的模型中做类似的事情:

has_many :special_options

在我看来:

f.select :special_options, :multiple =>真的

这将避免在存储对象之前必须序列化和反序列化对象的问题.

I am learning rails and have been struggling with this for over a day now and can not figure out how to get this to work. I want a select box in my form that can select multiple elements. I have this working with this code:

<div class="field">
<%= f.label :products %><br />
<%= f.select :products, {"A"=>1, "B"=>2, "C"=>3, "D"=>4},{},:size=>5,:multiple=>true %>
</div>

This works fine and produces this HTML:

<div class="field"> 
<label for="script_products">Products</label><br /> 
<select id="script_products" multiple="multiple" name="script[products][]" size="5">         
<option value="1">A</option> 
<option value="2">B</option> 
<option value="3">C</option> 
<option value="4">D</option></select> 
</div>

What I can figure out is how the results get sent/stored. In my view for the "show" action, if I simply print out :products I get this:

Products: --- - '1' - '2' - '3'

If I print out :products.inspect I get this:

Products: "---\n- '1'\n- '2'\n- '3'\n"

and the class is a string. I would think it would be stored as an array, but I can not get it to work. I don't know where the dashes or the newlines come from.

解决方案

I would consider adding the options as a has-many relationship on the model. Thus you can iterate through them, attach them and involve them in a multiple select in a (IMO) better way.

I would do something like in my model:

has_many :special_options

In my view:

f.select :special_options, :multiple => true

This would avoid the problem of having to serialize and deserialize the objects before storing them.

这篇关于表格多选的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！