Question

我有一个部分需要一些相关的脚本，所以我想在使用部分时将这些javascript include标签附加到标题中。所以我做了：

# app/assets/javascripts/tricky_js.js.coffee
alert "I've been required!!"

# app/views/layouts/application.slim
head
  # stuff...
  = yield :head

body
  = yield

# app/views/shared/_tricky_partial.slim
content_for :head do
  = javascript_include_tag :tricky_js

p Bleh

# app/views/shared/unrelated_view.slim
= render 'shared/tricky_partial'
= render 'shared/tricky_partial'
= render 'shared/tricky_partial'

这当然导致javascript标记被追加3次，因此运行alert("I've been required!!") 3次。 如何仅将脚本附加一次？

Answer 1

这个问题来了，所以我决定在这里分享解决方案。这不是一个高复杂性的问题，但可能会让你花费我半小时的时间......：

- unless content_for? :tricky_partial_assets
  - content_for :tricky_partial_assets do
    = stylesheet_link_tag :columns
    = stylesheet_link_tag :feedback_table
    /* v here is (almost) all the JS powering this partial */
    = javascript_include_tag :feedback_table
    = javascript_include_tag :wish_list_items

/* Append only once */
- unless content_for? :tricky_partial_assets_provided
  - content_for :head, content_for(:tricky_partial_assets)
  - content_for :tricky_partial_assets_provided, true

Rails partial：使用content_for只附加一次javascript include标签

1 个答案: