Ruby on Rails：如何在 form_tag 中实现取消按钮
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Ruby on Rails : how to implement Cancel button in form_tag
提问by fred basset
I have a basic form using the form_tag helper working fine, but I want to add a cancel button, what is the syntax for doing this? I want the cancel button to appear as a button, not a link, then take the user to a different URL (indicating they don't want to submit the form).
我有一个使用 form_tag 助手的基本表单工作正常，但我想添加一个取消按钮，这样做的语法是什么？我希望取消按钮显示为按钮，而不是链接，然后将用户带到不同的 URL（表明他们不想提交表单）。
TY, Fred
泰，弗雷德
回答by 99miles
If you want to clear/reset the form fields, do what dchacke suggests.
如果您想清除/重置表单字段，请按照 dchacke 的建议进行操作。
However, I'd generally expect a Cancel button to not clear the form, but to take me away from the form, meaning I don't plan on submitting it.
但是，我通常希望取消按钮不会清除表单，而是让我远离表单，这意味着我不打算提交它。
If you want the latter, I'd just make a link (or button) to the page you want to go to upon cancelling, such as :
如果您想要后者，我只需创建一个链接（或按钮）到您在取消时要转到的页面，例如：
=link_to 'Cancel', my_page_path
Or if you want a button:
或者如果你想要一个按钮：
= button_tag "Cancel", :type => 'button'
Then add this to your controller:
然后将其添加到您的控制器中：
before_filter :check_for_cancel, :only => [:create, :update]
def check_for_cancel
if params[:commit] == "Cancel"
redirect_to my_page_path
end
end
回答by dchacke
If you mean a reset button, paste the following inside your form:
如果您指的是重置按钮，请将以下内容粘贴到您的表单中：
<%= button_tag "Reset", type: :reset %>
Tested it, it works fine and resets all fields in the form.
测试它，它工作正常并重置表单中的所有字段。
回答by Overbryd
Instead of a submit tag, I would suggest a <button>tag, because the parameter :commitmight be localised, thus making it a pain to evaluate in the controller.
我建议使用<button>标签而不是提交标签，因为参数:commit可能是本地化的，因此在控制器中进行评估变得很痛苦。
A button_tagcan have a name/value like any other field, so you can basically create a flag with it.
Abutton_tag可以像任何其他字段一样具有名称/值，因此您基本上可以用它创建一个标志。
The following code is what I would use:
以下代码是我将使用的：
in the view:
在视图中：
<%= button_tag t('buttons.cancel'), type: "submit", name: "cancel", value: true %>
in the controller:
在控制器中：
before_filter :redirect_cancel, only: [:create, :update]
private
def redirect_cancel
redirect_to my_page_path if params[:cancel]
end
Much cleaner imho, because you rely on a flag instead of a (potentially) localised display value.
恕我直言，更干净，因为您依赖于标志而不是（潜在的）本地化显示值。
回答by bert bruynooghe
button_toseems a simple way to achieve the same, but it has to be put outside of the form itself, but that can easily be fixed with css.
button_to似乎是实现相同目标的简单方法，但它必须放在表单本身之外，但这可以通过 css 轻松修复。
Also, to solve this in a more generic way (also working for editing nested resources on a resource that has not been persisted yet), you can create a separate form for the cancel that contains all the original values as hidden fields.
此外，为了以更通用的方式解决此问题（也可用于编辑尚未持久化的资源上的嵌套资源），您可以为取消创建一个单独的表单，其中包含所有原始值作为隐藏字段。
