Ruby-on-rails 使用默认值检查 rails check_box_tag 设置
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rails check_box_tag set checked with default value
提问by Jeff Storey
I currently have a rails check_box_tag call that looks like
我目前有一个 rails check_box_tag 调用，看起来像
check_box_tag #{name}
I want to include a checked attribute, which I know I can do with
我想包含一个检查属性，我知道我可以用
check_box_tag name, value, checked
But what if I want to set it to checked without explicitly specifying value(I just want to use the default). Or similarly, what if I wanted to specify html options without specifying the checkedattribute. Is there a way to do this?
但是如果我想在没有明确指定value的情况下将它设置为选中（我只想使用默认值）怎么办。或者类似地，如果我想指定 html 选项而不指定checked属性怎么办。有没有办法做到这一点？
回答by KPheasey
Just wanted to update this. The third parameter for check_box_tagis a boolean value representing the checked status.
只是想更新这个。for的第三个参数check_box_tag是一个布尔值，表示检查状态。
check_box_tag name, value, true
回答by user2516008
If you want the checkbox to be checked, then
如果您希望选中复选框，则
check_box_tag name, value, {:checked => "checked"}
otherwise
除此以外
check_box_tag name, value
回答by shilovk
check_box_tag(name, value = "1", checked = false, options = {})
check_box_tag（名称，值=“1”，选中=假，选项={}）
Examples:
例子：
check_box_tag 'receive_email', 'yes', true
# => <input checked="checked" id="receive_email" name="receive_email" type="checkbox" value="yes" />
check_box_tag 'tos', 'yes', false, class: 'accept_tos'
# => <input class="accept_tos" id="tos" name="tos" type="checkbox" value="yes" />
check_box_tag 'eula', 'accepted', false, disabled: true
# => <input disabled="disabled" id="eula" name="eula" type="checkbox" value="accepted" />
回答by dimuch
There are no ways to do it directly. But the check_box_tagimplementation is trivial, you can monkey patch it or create own helper.
没有办法直接做到这一点。但是check_box_tag实现是微不足道的，你可以给它打补丁或创建自己的助手。
Original implementation:
原始实现：
def check_box_tag(name, value = "1", checked = false, options = {})
html_options = { "type" => "checkbox", "name" => name, "id" => sanitize_to_id(name), "value" => value }.update(options.stringify_keys)
html_options["checked"] = "checked" if checked
tag :input, html_options
end
回答by viks
If anyone have column type boolean then look at this. is_checked? will be default boolean value. It worked for me.
如果有人有列类型 boolean 然后看看这个。is_checked？将是默认的布尔值。它对我有用。
<%= hidden_field_tag :name, 'false' %>
<%= check_box_tag :name, true, is_checked? %>
<%= hidden_field_tag :name, 'false' %>
<%= check_box_tag :name, true, is_checked? %>
回答by Taylor Roozen
If you pass in a value of "1" to the value field, it will pass-on the value of the real state of the checkbox, regardless of the checked default value:
如果向 value 字段传递值“1”，它将传递复选框的真实状态值，而不管选中的默认值：
is_checked = <default boolean>
check_box_tag :show_defaults, '1', is_checked
(now always reflects user input)
（现在总是反映用户输入）
