在rails asset pipeline中的js.coffee文件中使用erb时出错 [英] Error using erb in js.coffee files in the rails asset pipeline
问题描述
我有以下代码:
/assets/javascripts/home.js.coffee.erb
jQuery - >
addClickListeners = - >
$(document).on'click','#add-chord-link',addChord
$(document).on'click','#remove-chord-link',removeChord
addChord =(e) - >
e.preventDefault()
console.log(<%= asset_path('rails.png')%>)
console.log(<%= link_to'立即注册!','#'%>)
console.log('addChord clicked')
$('#chord-choices')。append('addedChord')
removeChord =(e) - >
e.preventDefault()
$('#chord-choices select')。last()。remove()
console.log('removeChord clicked')
addClickListeners()
console.log <%= asset_path('rails.png')%>)
是 /assets/rails.png
。但是,每当我包含 console.log(<%= link_to'立即注册!','#'%>)
未定义的方法`link_to'for#<#< Class:0x007f9095960938>:0x007f9095b78ab8&
为什么这不工作?
问题
原因是Sprockets是Assets pineline背后的宝石,不依赖于Rails来处理erb。 查看可用的本机帮手 https://github.com/sstephenson/sprockets #invoking-ruby-with-erb
Rails在ActiveSupport中为资产Pineline添加了更多帮助,他们都是您可以使用的。您可以在这里找到它们: http://api.rubyonrails.org/classes/ActionView /Helpers/AssetUrlHelper.html
link_to
是属于ActionView的帮手,因此不包括资产小队。
hacks
有一些解决方案允许您在资产Pineline中使用ActionView助手:
https://github.com/sstephenson/ sprockets / issues / 218
我的建议
如果你需要的是有问题的链接或多一点,没有必要麻烦了。使用纯文本或Javascript帮助器。就够了。
//纯文本
< a href ='#'>注册& a>
// JS helper
Link = {}
Link.sign_up =< a href ='#'>注册< / a&
Link.link_to =(url,anchor) - >
< a href = \#{url} \>#{anchor}< / a>
console.log(Link.sign_up)
console.log(Link.link_to(#,注册))
I have the following code:
/assets/javascripts/home.js.coffee.erb
jQuery ->
addClickListeners = ->
$(document).on 'click', '#add-chord-link', addChord
$(document).on 'click', '#remove-chord-link', removeChord
addChord = (e) ->
e.preventDefault()
console.log("<%= asset_path('rails.png') %>")
console.log("<%= link_to 'Sign up now!', '#' %>")
console.log('addChord clicked')
$('#chord-choices').append('addedChord')
removeChord = (e) ->
e.preventDefault()
$('#chord-choices select').last().remove()
console.log('removeChord clicked')
addClickListeners()
The console output for the console.log("<%= asset_path('rails.png') %>")
is /assets/rails.png
, which is what I expect. However, whenever I include console.log("<%= link_to 'Sign up now!', '#' %>")
I get an error when the page is loaded stating:
undefined method `link_to' for #<#<Class:0x007f9095960938>:0x007f9095b78ab8>
Why is this not working?
The problem
The reason is Sprockets, the gem behind Assets pineline, doesn't depend on Rails to process erb. See the native helpers available https://github.com/sstephenson/sprockets#invoking-ruby-with-erb
Rails added some more helpers to Assets Pineline in ActiveSupport, they are all you can use. You can find them here: http://api.rubyonrails.org/classes/ActionView/Helpers/AssetUrlHelper.html
link_to
is a helper belonging to ActionView, so it's not included in Assets Pineline.
The hacks
There are some solutions to allow your using ActionView helpers within Assets Pineline:
Route helpers in asset pipeline
https://github.com/sstephenson/sprockets/issues/218
How to include ActionView helpers in the assets pipeline?
My suggestions
If all you need is the link in question or a little bit more, no need the trouble to hack around. Use plain text or a Javascript helper. That's enough.
//plain text
"<a href='#'>Sign up</a>"
//JS helper
Link = {}
Link.sign_up = "<a href='#'>Sign up</a>"
Link.link_to = (url, anchor) ->
"<a href=\"#{url}\">#{anchor}</a>"
console.log(Link.sign_up)
console.log(Link.link_to("#", "Sign up"))
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