Ruby On Rails-基于控制器和操作的HTML条件

Question

I have a syntax issue I'm trying to sort out. I'm just trying to check if a controller/action is loaded, and if so do something, and if not do something else, seems simple. This gives me an error:

<% if (:controller => 'home', :action => 'index') do %>
    <div class="header">
<% else %>
    <div class="header-2">
<% end %>  

Can someone assist me with the syntax issue here? Thank you!

Answer 1

You have to modify the if clause like this:

<% if controller_name == 'home' && action_name == 'index' %>

Additionally, if have to call this more than once, I'd suggest you define a helper.

application_helper.rb

def home_index?
  controller_name == 'home' && action_name == 'index'
end

This way your code will be a lot more readable:

some_view.html.erb

<div class='<%= home_index? ? "foo" : "bar" %>'>

Answer 2

You can use a Rails provided helper to check those kind of things (current controller/action, parameters, ...): current_page?

<% if current_page?(controller: 'home', action: 'index') %>
  <div class="header">
<% else %>
  <div class="header-2">
<% end %> 

Documentation: http://api.rubyonrails.org/classes/ActionView/Helpers/UrlHelper.html#method-i-current_page-3F

Using this helper you can also check for specific parameters:

 current_page?(controller: 'home', action: 'index', page: '2')

Answer 3

In the view, you'll need to check for controller_name and action_name . Try this

<% if controller_name == 'home' && action_name == 'index' %>
    <div class="header">
<% else %>
    <div class="header-2">
<% end %> 

Answer 4

Try this in ur view , it will works

<% if (controller_name == 'applications' && action_name == 'index') %>
    <div class="header">
<%else%>
    <div class="header-2">
<%end%>