“SelectDatabase”和“SelectTable”下拉菜单不起作用。
_header.html.erb 文件
<header class="navbar navbar-fixed-top navbar-inverse">
<div class="container">
<%= link_to "Database Management", root_path, id: "logo" %>
<nav>
<ul class="nav navbar-nav navbar-right">
<li><%= link_to "Home", root_path %></li>
<li class="dropdown">
<a href="#" class="dropdown-toggle" data-toggle="dropdown">
SelectTable <b class="caret"></b>
</a>
<ul class="dropdown-menu">
<% if $l == 1 %>
<% for items in $selectedtable %>
<li><%= link_to items, currenttable_path %> </li>
<% $gh = item %>
<% end %>
<% end %>
</ul>
<li class="dropdown">
<a href="#" class="dropdown-toggle" data-toggle="dropdown">
SelectDatabase <b class="caret"></b>
</a>
<ul class="dropdown-menu">
<% for item in $selecteddatabase %>
<li><%= link_to item, currentdatabase_path %></li>
<% $gy = item %>
<% end %>
</ul>
<li><%= link_to "NewTable", newtable_path %></li>
<li><%= link_to "NewDatabase", newdatabase_path %></li>
<li><%= link_to "DeleteTable", deletetable_path %></li>
<li><%= link_to "DeleteDatabase", deletedatabase_path %></li>
<li><%= link_to "Connect", connect_path %></li>
<li><%= link_to "Disconnect", disconnect_path %></li>
<li><%= link_to "Administration", administration_path %></li>
<li><%= link_to "Quit", quit_path %></li>
</ul>
</nav>
</div>
</header>
application.html.erb 文件
<!DOCTYPE html>
<html>
<head>
<title><%= full_title(yield(:title)) %></title>
<%= stylesheet_link_tag 'application', media: 'all',
'data-turbolinks-track' => true %>
<%= javascript_include_tag 'application', 'data-turbolinks-track' => true %>
<%= csrf_meta_tags %>
<%= render 'layouts/shim' %>
</head>
<body>
<%= render 'layouts/header' %>
<div class="container">
<% flash.each do |message_type, message| %>
<%= content_tag(:div, message, class: "alert alert-#{message_type}") %>
<% end %>
<%= yield %>
<%= render 'layouts/footer' %>
<%= debug(params) if Rails.env.development? %>
</div>
</body>
</html>
application_controller.rb 文件
require 'mysql2'
class ApplicationController < ActionController::Base
# Prevent CSRF attacks by raising an exception.
# For APIs, you may want to use :null_session instead.
protect_from_forgery with: :exception
$con = Mysql2::Client.new(host: "localhost", username: "root", password: "new_password", database: "mysql")
before_filter :assign_header_variables
def assign_header_variables
rs = $con.query("SHOW databases")
i = 0
for y in rs
i = i + 1
end
c = 0
$selecteddatabase = Array.new(i)
for item in rs
$selecteddatabase[c] = item
c = c + 1
end
if $l == 1
ts = $con.query("SHOW tables")
i = 0
for y in ts
i = i + 1
end
k = 0
$selectedtable = Array.new(i)
for items in ts do
$selectedtable[k] = items
k = k + 1
end
end
end
end
答案1
我找到了问题的答案。
将 Bootstrap JavaScript 库添加到 application.js。app/assets/javascripts/application.js
- //= 需要 jquery
- //= 需要 jquery_ujs
//= require bootstrap- //= 需要 turbolinks
- //= 需要树。