Ruby-on-rails 在 Rails 的文本框中格式化日期时间
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Format DateTime in Text Box in Rails
提问by jerhinesmith
Is there an easy way to format the display of a DateTimevalue in a Rails view?
有没有一种简单的方法来格式化DateTimeRails 视图中值的显示？
For example, if I'm doing something like:
例如，如果我正在做类似的事情：
<%= text_field :my_object, :start_date %>
and only want to display the Date part of the :start_date(i.e. I want to hide the time part), is there a way to format the :start_datestring inside of the view such that it will work for creating new my_objectitems and updating new my_objectitems?
并且只想显示日期部分:start_date（即我想隐藏时间部分），有没有办法格式化:start_date视图内的字符串，以便它可以用于创建新my_object项目和更新新my_object项目？
Just a clarification:
只是澄清一下：
Doing
正在做
<%= text_field
:my_object,
:start_date,
:value => @my_object.start_date.strftime('%m/%d/%Y') %>
works beautifullywhen the object already exists (i.e. on item updates), however, when creating a newitem, since start_date will initially be nil, the view will throw an error
当对象已经存在时（即项目更新时）效果很好，但是，当创建新项目时，由于 start_date 最初为 nil，视图将抛出错误
while evaluating nil.strftime
回答by Dave Rapin
Some great suggestions here, however in those cases where you really do want your text field date formatted a specific way (say you're integrating with a javascript date picker), and you're dealing with nils, I think simply making a minor tweak to your existing method would do the trick:
这里有一些很好的建议，但是在那些您确实希望以特定方式格式化文本字段日期的情况下（假设您正在与 javascript 日期选择器集成），并且您正在处理 nils，我认为只需进行小幅调整到您现有的方法可以解决问题：
:value => (@object.start_date.blank? ? '' : @object.start_date.strftime('%m/%d/%Y'))
回答by Alessandra Pereyra
I can think of three ways:
我可以想到三种方式：
1) Creating a new method on the model that would format your date however you need it to be
1）在模型上创建一个新方法来格式化你的日期，但是你需要它
2) Creating a helper method that would do the same
2）创建一个可以做同样事情的辅助方法
3) Have you tried doing:
3）您是否尝试过：
<%= text_field
:my_object,
:start_date,
:value => @my_object.try(:start_date).try(:strftime,'%m/%d/%Y') %>
回答by Eimantas
If your form is tied to an object, (something like <% form_for(:object) do |f| %>) you should use <%= f.text_field :start_date, :value => f.object.start_date.to_s(:date_format) %>
如果您的表单绑定到一个对象，（类似<% form_for(:object) do |f| %>），您应该使用<%= f.text_field :start_date, :value => f.object.start_date.to_s(:date_format) %>
then you can register your :date_formatin config/environment.rb
然后你可以:date_format在 config/environment.rb 中注册你的
Not sure why you want to do this, but i hope it's for presentation purposes only.
不知道您为什么要这样做，但我希望它仅用于演示目的。
回答by Thomas Schmidt
In my application_helper.rb I put
在我的 application_helper.rb 我把
def nice_date_form(the_date)
return the_date.strftime('%d-%m-%Y')
end
In any edit.html.erb view file with a jQuery datepicker I then use:
在任何带有 jQuery datepicker 的 edit.html.erb 视图文件中，我然后使用：
<% if @activity.end_date? %>
<%= f.text_field :end_date, :value => nice_date_form(@activity.end_date) %>
<% else %>
<%= f.text_field :end_date %>
<% end %>
回答by pdobb
This can be handled DRYly at the model layer using the Rails-provided <attribute>_before_type_castmethod variant. Rails already uses this method for doing just this type of formatting, so we're just overwriting the default. For example:
这可以使用 Rails 提供的<attribute>_before_type_cast方法变体在模型层进行 DRY 处理。Rails 已经使用这种方法来进行这种类型的格式化，所以我们只是覆盖了默认值。例如：
class MyModel
def start_date_before_type_cast
return unless self[:start_date]
self[:start_date].strftime('%m/%d/%Y')
end
end
This way, anywhere you have a text field for the MyModel#start_date field you get formatting for "free".
这样，在任何有 MyModel#start_date 字段的文本字段的地方，您都可以“免费”格式化。
回答by montrealmike
In a helper
在帮手
def l(value, options = {})
return nil unless value.present?
value = value.to_date if value.is_a? String
super(value, options)
end
Then in the view
然后在视图中
<%= f.text_field :end_date, class: "datepicker" :value => l(@activity.end_date) %>
Here lis a rails helper (I18n.l) which can be locale specificand can take a format. Examples:
这l是一个 rails helper ( I18n.l)，它可以是特定于语言环境的并且可以采用一种格式。例子：
l(@activity.end_date, format: :short)
l(@activity.end_date, format: "%d-%m-%Y")
回答by ax.
if you don't want to enter the date in a textfield, but in a less error prone select field, you could use the ActionView::Helpers::DateHelper, select_date(). see Accessing date() variables send from the date helper in railshere on SO on how to process the return values.
如果您不想在文本字段中输入日期，但在不太容易出错的选择字段中，您可以使用ActionView::Helpers::DateHelper、select_date()。关于如何处理返回值，请参阅访问从 rails 中的日期助手发送的 date() 变量。
