我正在尝试使用此 guide 制作动态选择菜单;但是,它似乎并没有改变 select select 语句。
这是我所拥有的代码:
#characters_controller.rb
def new
@skills = Skill.all
@classes = Classe.all
@background = Background.all
@character = Character.new
end
def update_classe_skills
classe = Classe.find(params[:character][:classe_id])
@skills = classe.skills.map{|a| [a.name,a.name]}.insert(0,"Select a Skill")
respond_to do |format|
format.js
end
end
#routes.rb
Rails.application.routes.draw do
resources :characters
get 'characters/update_classe_skills', :as => 'update_classe_skills'
end
这是 .js.erb 文件:
#update_classe_skills.js.erb
$('#character_classe_skill_option_one').html("<%= escape_javascript(options_for_select(@skills)) %>");
这是我的 AJAX 脚本:
#skills_select_handler.js
$(document).ready(function() {
$(document).on('change','#character_classe_id', function() {
$.ajax({
url: "#{update_classe_skills_path}",
data: {
classe_id : $('#character_classe_id').val()
},
dataType: "script",
type: 'GET'
});
});
});
最后,这是我的选择菜单:
#new.html.erb
<%= javascript_include_tag "skills_select_handler.js" %>
<%= form_for :character, url: characters_path, method: :post do |f| %>
<%= render :partial => "info_step", :locals => {:f => f} %>
<%= render :partial => "rand_prompt_step", :locals => {:f => f} %>
<%= render :partial => "skills_step", :locals => {:f => f}%>
<% end %>
#_info_step.html.erb
<p>
<%= f.label :classe_id, "Class" %><br>
<%= f.select :classe_id, options_for_select([["Barbarian", 1], ["Bard", 2], ["Cleric", 3], ["Druid", 4], ["Fighter", 5], ["Monk", 6], ["Paladin", 7], ["Ranger", 8], ["Rogue", 9], ["Sorcerer", 10], ["Warlock", 11], ["Wizard", 12]], selected: "#{@character.classe_id}"), include_blank: true, id:'character_classe_id' %>
<span><%= @character.errors[:classe_id][0] %></span>
</p>
#_skills_step.html.erb
<div id="classe_skill_proficiency_one">
<p>
<%= f.label :classe_skill_option_one, "Skill Proficiency" %>
<br>
<%= f.collection_select(:classe_skill_option_one, @skills, :name, :name,{:prompt => "Select a Skill"}, {id: 'character_classe_skill_option_one'})%>
</p>
</div>
我曾经将所有部分渲染为"new" View ,但是,这不起作用。我自己尝试过排除故障,所以事情可能变得有点不稳定。
当我更改类后查看服务器控制台时,我确实看到了以下内容:
Processing by CharactersController#new as JS
Parameters: {"classe_id"=>"1", "_"=>"1454977094482"}
[list of stuff being loaded and rendered]
Skill Load (0.0ms) SELECT "skills".* FROM "skills"
因此,这让我相信它领先于 AJAX 请求,但随后只是加载整个技能列表,而不是加载到特定类的技能。
连接表已正确创建,因此这不是问题。
有人对如何让选择菜单更改其选项有任何想法吗?
最佳答案
这样做:
#config/routes.rb
resources :characters
get "update_classe_skills/:classe_id", as: 'update_classe_skills', on: :collection #-> url.com/characters/update_classe_skills/:classe_id
end
#skills_select_handler.js
$(document).on("change","#character_classe_id", function(e) {
var classe_id = $(this).val();
$.ajax({
url: "characters/update_classe_skills/" + classe_id,
data: { classe_id : classe_id },
dataType: "script",
type: 'GET'
});
});
#app/controllers/characters_controller.rb
class CharactersController < ApplicationController
def update_classe_skills
@classe = Classe.find params[:classe_id]
respond_to do |format|
format.js
end
end
end
#app/views/characters/update_classe_skills.js.erb
$('select#character_classe_skill_option_one').empty.append("<%=j options_from_collection_for_select(@skills, 'name', 'name') %>");
<小时/>
我相信您的代码中有几个错误:
- 您的
ajax
URL 依赖于 JS 值 (classe_id
),但您没有它 - 您的
update_classe_skills
JS 不会更新select
(仅更新容器div
) - 您的 Controller 方法效率低下
关于javascript - 动态选择菜单 Rails 4,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/35282143/