I'm developing a music website in Rails. The landing page is divided and has a search form where you can look up bands stored in the DB. Inside the other division I embedded a player reproducing some random videos. I want the search results being displayed on the same landing page.
When I submit the form the page reloads and the player reloads also and starts playing a different video. What I actually want to achieve is that the player doesn't get interrupted while the search form is submitted.
Don't know if and how this is possible the way I want it. If I got it right this link describes one way to do that but I didn't get it to work.
home controller
def index
#bands = Band.search(params[:search]).order("name ASC")
#random_band = Band.order("RANDOM()").limit(1)
end
def preview
#bands = Band.search(params[:search]).order("name ASC")
render :partial => 'preview', :content_type => 'text/html'
end
_preview.html.erb
<table class="table"
<tr>
<th>Title</th>
<th>Year</th>
</tr>
<% #bands.each do |f| %>
<tr>
<td>
<%= f.name %>
</td>
</tr>
<% end %>
</table>
home#index
<!DOCTYPE html>
<html lang="en">
<form class="navbar-form navbar-left" role="search">
<%= form_tag({:action => 'preview'}, id: "search-form", :remote => true, :'data-update-target' => 'update-container') do %>
<%= text_field_tag :search, params[:search], placeholder: "Search Bands" %>
<%= submit_tag "Search" %>
<% end %>
</form>
<div class="row">
<div class="col-md-6">
<div id="update-container">
<%= #random_band.first.name %>
</div>
</div>
<div class="col-md-6">
<%= video_tag("#{#random_band.first.name}.mp4", size: "460x390",
controls: true, autobuffer: true, autoplay: true) %>
</div>
</div>
</html>
application.js
$(function() {
/* Convenience for forms or links that return HTML from a remote ajax call.
The returned markup will be inserted into the element id specified.
*/
$('form[data-update-target]').live('ajax:success', function(evt, data) {
var target = $(this).data('update-target');
$('#' + target).html(data);
});
});
First problem: The form doesn't seem to find the preview action.
Second problem: If I change the content of the index with the preview action it does find the preview action obviously but it doesn't render the search results inside the update-container. Instead it renders them as a whole new page.
By the way, I know my way around Rails a bit but I've got absolutely no experience with Ajax.
You got most of your code very twisted and not really lean as far as I can tell. The short and very lean way to get your search results updated without reloading the rest of the page (including your player) could look like this. The index function should look like this:
//bands_controller.rb
def index
#bands = Band.search(params[:search])
end
You have to create the search-method inside of your Band-Model:
//Band.rb
def self.search(search)
if search
find(:all, :conditions => ['name LIKE ?', "%#{search}%"])
else
find(:all)
end
end
You need to render your _preview.html.erb inside a div with a certain ID somewhere inside your view:
<div id="bands"><%= render 'preview' %></div>
Your form_tag has a lot of arguments that you won't need anymore:
<%= form_tag bands_path, :method => 'get', :id => "search_form" do %>
<%= text_field_tag :search, params[:search] %>
<%= submit_tag "Search", :name => nil %>
<% end %>
The jquery I use for my forms looks like this.. Pretty simple in my opinion:
$(function() {
$("#search_form input").keyup(function() {
$.get($("#search_form").attr("action"), $("#search_form").serialize(), null, "script");
return false;
});
});
This fires the index.js.erb (you will have to create that) everytime you put a letter into your search field:
//index.js.erb (same folder as index.html.erb)
$("#bands").html("<%= escape_javascript(render("preview")) %>");
This should refresh your div. It's maybe a little work but that's the easiest way to implement an ajax search function into your index page that I could think of.
Sources:
Railscast#27
Railscast#240
Related
I want site visitors to be able to view nearby shows within a radius that can be input via dropdown form. I have a view that displays nearby shows using the Geocoder gem:
<h3> Shows near <%= request.location.city %> </h3>
<%= form_for #nearby_shows.first do |f| %>
<p> Radius (in miles): <%= f.select(:radii, [10,20,30,40,50], {},
:style => "width:50px", :selected => f.object.radii, :onchange =>
"location.href = '#{shows_path}'") %> </p>
<% end %>
<ul class="users">
<% #nearby_shows.each do |nearby_show| %>
<li>
<%= link_to nearby_show.show_name, nearby_show %>
</li>
<% end %>
</ul>
Right now the selection doesn't affect anything, and the selection isn't remembered in the form when the page refreshes.
The model, show.rb contains:
attr_accessor :radii
And the shows controller contains:
def index
#shows = Show.all
#radii = 50
#nearby_venues = Venue.near("Boulder, CO",#radii,:select =>
"id").to_a
#nearby_shows = Show.where(show_venue: #nearby_venues)
end
In production, I'll be using request.location.city, but in development I'm just using "Boulder, CO" as an example.
How can I set #radii using the input select form? I am concerned that form_for will not permit me to change a variable for the list of entities #nearby_shows.
If you want a fast AJAX solution, here's what I would do
First, add an ID to your list so it's easy to manipulate
<ul id="my_id" class="users"></ul>
I really don't understand why you need that <%= form_for #nearby_shows.first %> for ? If I understand well, you just want to show a select, and update the list of nearby shows based on what the user selects ?
routes.rb
resource :shows do
get 'update_nearby', on: :collection, constraints: { format: 'js' }
end
# GET /shows/update_nearby, meant to be used only with AJAX
your_view.html.erb
<%= form_tag update_nearby_shows_path, remote: :true do |f| %>
<p> Radius (in miles): <%= select_tag(:radii, [10,20,30,40,50], {},
:style => "width:50px", :selected => #radii, :onchange =>
"location.href = '#{shows_path}'") %> </p>
<% end %>
<!-- On Submit, it will request a JS response
You can add some JS to submit the form everytime the select changes -->
Add some JS specific respone
your_controller.rb
def update_nearby
find_nearby_shows
end
private
def find_nearby_shows
#radii = params[:radii] ? params[:radii] : 50
#nearby_venues = Venue.near("Boulder, CO",#radii,:select =>
"id").to_a
#nearby_shows = Show.where(show_venue: #nearby_venues)
end
update_nearby.js.erb
<% if #nearby_shows %>
// Empty the list
var id = $("#my_id").empty()
<% #nearby_shows.each do %>
// Add one <li> per show
$("<li>", { 'html': "<%= escape_javascript(link_to(nearby_show.show_name, nearby_show)) %>"}).appendTo(id)
<% end %>
<% end %>
Bonus : you said you wanted to save the radius ? You can actually try to add it to the user session
def index
...
#radii = session[:saved_radii] ? session[:saved_radii] : DEFAULT_RADIUS
...
end
def update_nearby
find_nearby_shows
session[:saved_radii] = #radii
end
But if you really want to save it for the user, you should have a preferred_radii field in your User model
Does anyone know a good guide or example for me to follow on how to change data on the screen using ajax?
I have a div that stores the last #event_status and every 5 minutes I want to go get the last event status created and display it in the div using ajax.
<div id="last_status">
Last Status:
<% if #event_status.present? %>
<span id="last_status_content">[<%= #event_status.user.initials %> # <%= #event_status.created_at.strftime("%I:%M%p") %>]<br />
Audio: <%= #event_status.audio ? 'Good' : 'None' %> |
Video: <%= #event_status.video ? 'Good' : 'None' %> |
<% if #event_status.notes.present? %>
Notes: <%= #event_status.notes %>
<% else %>
Notes: No Notes
<% end %>
</span>
<% else %>
<span id="last_status_content">None</span>
<% end %>
</div>
You can use javascript to periodically call an action and place the contents into a div. First extract the content of your last_status div to a partial, then return said partial from a controller action.
Javascript in your page:
$(document).ready(
function() {
setInterval(function() {
$('.last_status').load('/controller_name/action_name');
}, 36000);
}
);
Your controller action needs to then initialize all variables used by the partial, then render the partial.
def my_action
#event_status = get_latest_event
render :partial => 'my_partial'
end
In my Rails app users have folders, and inside these folders are posts that they can add. Right now I have the folders displaying in my view like this:
<% current_user.folders.each do |folder| %>
<a href='#' id="addSubmissions">
<div id="post-container">
<%= folder.title %> <p id="created-time">Created <%= folder.created_at.strftime("%e/%-m") %></p>
</div>
</a>
<% end %>
What I'd like to do is load the submissions associated with a folder into a div when the #addSubmissions link is clicked. I've tried testing it out with this:
$('#addSubmissions').click(function(){
$('#post-container').append('<%= render :partial => 'contents', :locals => {:folder => folder } %>');
});
But it seems like that render code actually needs to be local beforehand.
The _contents.html.erb partial works, and is pretty simple:
<%= folder.title %>
<% folder.submissions.each do |i| %>
<%= i.title %>
<% end %>
How could I go about doing this? Again, I want to be able to click the link of a folder and load the submissions inside the folder into a div in the view. I'm thinking AJAX might be the solution, but I'm pretty new to Ruby so I don't know how to implement this.
This way it won't work. You need contoller method, which responds to JS, because you are fetching pure ruby variables.
Instead of:
<a href='#' id="addSubmissions">
you might try:
<%= link_to folder_content_path(folder), :remote=>true, :class=> "addSubmissions", :id=>folder.title %>
<div class="post-container" id="<%= folder.title %>">
<%= folder.title %> <p id="created-time">Created <%= folder.created_at.strftime("%e/%-m") %></p>
</div>
or other method name you want. Also note, that ID should be unique for page, otherwise you won't get expected result. Here I use folder name as ID, it probably unique, and it is easy way to find div we want modify with JS.
def folder_content
#folder=Folder.find(params[:id])
respond_to do |f|
f.js
end
end
folder_content.js.erb:
$("#"+"<%=#folder.title %>").append('<%= j render :partial => 'contents', :locals => {:folder => #folder } %>');
I'm implementing show/hide feature for users comments.
Discussed here: https://stackoverflow.com/a/10174194/439688
My aim was to:
1. Limit the default shown comments to 2.
2. Have a span with text that states the number of total comments for that particular micropost and when clicked by a user have it expand and show all comments for that micropost. I would be using Jquery/Ajax to hide, show, prepend etc.
The first change was to limit the amount of comments shown to the user and I achieved this by creating a method in my helper called "comments" and here I pass in the id of the micropost the comment belongs to.
def get_comments(micropost_id)
Comment.limit(2).order("created_at DESC").where(:micropost_id => micropost_id)
end
Now the each loop that loops through each comment will only show the 2 most recent comments.
<<% #microposts.each do |m| %>
<% if m.poster_id.nil? %>
<div class="postHolder">
<nav class="micropostOptions">
<ul class="postMenu">
<li class="deletePost"><%= link_to content_tag(:span, "Delete post"), m, :method => :delete, :confirm => "Are you sure?", :title => m.content, :class => "message_delete", :remote => true %>
</li>
<li class="disableCommenting"><%= link_to content_tag(:span, "Pause commenting"), "2" %></li>
<li class="blockCommenter"><%= link_to content_tag(:span, "Block commenter"), "3" %></li>
<li class="openInNewWindow"><%= link_to content_tag(:span, "Open in new window"), "4" %></li>
<li class="reportAbuse"><%= link_to content_tag(:span, "Report abuse"), "5" %></li>
</ul>
</nav>
<%= link_to image_tag(default_photo_for_current_user, :class => "poster_photo"), current_users_username %>
<div class="post_content">
<div class="post_container">
<div class="mainUserNameFontStyle"><%= link_to current_users_username.capitalize, current_users_username %> - <div class="post_time"> <%= time_ago_in_words(m.created_at) %> ago.</div>
</div>
<%= simple_format h(m.content) %> </div>
<div class="commentsCount">
<%= content_tag :span, pluralize(m.comments.count, 'comment'), :class => "view_all_comments" if m.comments.any? %>
</div>
<% if m.comments.any? %>
<% comments(m.id).each do |comment| %>
<div class="comment_container">
<%= link_to image_tag(default_photo_for_commenter(comment), :class => "commenter_photo"), commenter(comment.user_id).username %>
<div class="commenter_content"> <div class="userNameFontStyle"><%= link_to commenter(comment.user_id).username.capitalize, commenter(comment.user_id).username %> - <%= simple_format h(comment.content) %> </div>
</div><div class="comment_post_time"> <%= time_ago_in_words(comment.created_at) %> ago. </div>
</div>
<% end %>
<% end %>
<% if logged_in? %>
<%= form_for #comment, :remote => true do |f| %>
<%= f.hidden_field :user_id, :value => current_user.id %>
<%= f.hidden_field :micropost_id, :value => m.id %>
<%= f.text_area :content, :placeholder => 'Post a comment...', :class => "comment_box", :rows => 0, :columns => 0 %>
<div class="commentButtons">
<%= f.submit 'Post it', :class => "commentButton", :disable_with => "Post it" %>
<div class="cancelButton"> Cancel </div>
</div>
<% end %>
<% end %>
</div>
</div>
From here this is where it gets confusing for me. I got slightly further using link_to but then decided I'd prefer not to have the url to the comments count show in the browser status bar. This is why I switched to using span.. but now it's not quite easy to do what I wish to do as I can't use the link_to/remote => true now.
How do I make it so when a user clicks the comment count span an ajax call is made pointing to:
def load_comments
#load_comments = Comment.where(:micropost_id => params[:id])
respond_to do |format|
format.js { render :load_comments }
end
end
I thought about putting a click function in users.js but how would I pass the params of the micropost that is in the each loop in the code above into users.js? I don't think it's possible.
All my comment posting is done via ajax but because I used forms for these it was so much easier for me to just add remote => true and create some js templates and do something on success of ajax post.
Not sure if I'm even going about this the right way. I'd appreciate some help/advice from more experienced rails programmers.
Kind regards
Rails partial
#Display all the comments based on local passed to this partial
# Initially pass limit as 2(or whatever you want). then on click of span pass limit as nil. then you can check if limit is nil you can query the model without limit specifier.
<% #comments = Comment.custom_find(#your_params) %>
<% #comments.each do |comment| %>
<%= comment.title %>
<% end %>
javascript/jquery
function load_all_comments(id)
{
new Ajax.Updater('show_comments',
'<%=url_for(:controller => "your_controller", :action => "your_action")%>', {
parameters: {'id':id },
method: 'get',
onSuccess: function(request){
div_comments = document.getElementById("partial_comments_list");
div_comments.innerHTML = request.responseText;
}
});
} // you can call this js function on span click. use jquery if you want.
Controller:
Then inside your_action of your_controller, dont forget to render the partial
render :partial => "show_comments", :layout => false
Edit:
you can even pass locals to your partial
render :partial => "show_comments", :locals => {:post => #post}
Using this every time your partial view will get updated, on the basis of locals you pass.
of course this is just an example not a complete code/solution.
There may be better ways. but this worked fine for me.
Another option is to just output all of the comments and hide the ones you don't want to show first. <div class="hidden_comments" style="display:none;"> a comment </div>
Then just have some javascript to show them when the span is clicked?
<script type="text/javascript">
$("#span_id").click(function() {
$('.hidden_comments').show();
});
</script>
This works great if you do not don't have a ton of comments.
If you really want to do it your way, I have done it before but it gets messy.
Put this in your application.js
$('.comment_span').live('click', function () {
$.get(this.data_url, null, update_row, 'json');
return false;
});
Your span would look like this:
<span class="comment_span" data_url="http://website.com/resource/more_comments">
show all comments
</span>
This example returns the data as json, so I used the update_row function to update replace the comments data.
function update_row(data, status) {
$("#comments-table").append(data.html);
};
Here is what my controller looked like:
def more_comments
#comments = Comments.all
if #comments
respond_to do |format|
format.js {
render :json => {
:html => render_to_string(:partial => "comments"),
}.to_json
}
end
end
end
You should do this via your index action.
Pass a param to it to determine if you want to show all comments or just the current set (I'd use will_paginate to handle this.
Haven't looked too deep into your code as I'm on my phone right now, but something like this:
class CommentsController < ApplicationController
def index
If params[:show_all] == "true"
#comments = Comment.all
else
#comments = Comment.where(foo: bar).paginate(per_page: 2, page: params[:page])
end
end
Then you have it respond to JavaScript and send the page param with your Ajax request
At the moment I try to do following:
I created several partials (i.e. _show_signature.html.erb) for my user.
Now I want to show them on clicking a link.
In my user controller, I created a new action:
def show_signature
#is_on_show_signature = true
end
def show_information
#is_on_show_information = true
end
on my user show.html.erb i coded this:
<% if #is_on_show_information %>
<%= render :partial => 'show_information' %>
<% elsif #is_on_show_signature %>
<%= render :partial => 'show_signature' %>
<% end %>
and in my "navigationbar" i wrote:
<ul>
<li class="profile-tab">
<%= link_to 'Information', show_information_path %>
</li>
<li class="profile-tab">
<%= link_to 'Signature', show_signature_path %>
</li>
</ul>
In my routes.rb I wrote:
map.show_information '/user-information', :controller => 'user', :action => 'show_information'
map.show_signature '/user-signature', :controller => 'user', :action => 'show_signature'
now my problem:
clicking on my "information" link will redirect me to http://localhost:3000/user-information (cause I told him this path in routes.rb - I think) and I get an error:
uninitialized constant UserController
But that's not what I want... My user show path is something like:
http://localhost:3000/users/2-loginname
(by coding
def to_param
"#{id}-#{login.downcase.gsub(/[^[:alnum:]]/,'-')}".gsub(/-{2,}/,'-')
end
in my user model)
I want to link to somethink like http://localhost:3000/users/2-test/user-information.
Any ideas how it will work? Any ideas why I get this error?
As far as Rails conventions go, the model itself is singular (User) but the table (users) and controller (UsersController) are both pluralized. This can cause a significant amount of confusion at first, and even after years of working with Rails I still make the mistake of trying things like 'user = Users.first' which is, of course, not valid, as often you get to thinking about table names instead of class names.
Also, for toggling the display of elements on a page, you probably want to use the link_to_remote method which uses AJAX for updates instead of a page refresh. If you're okay with a full page refresh, those actions will need to redirect_to something, such as the page referrer, or you will get a blank page or error since the page template does not exist.
Typically what you do is:
<ul>
<li class="profile-tab">
<%= link_to_remote 'Information', show_information_path %>
</li>
<li class="profile-tab">
<%= link_to_remote 'Signature', show_signature_path %>
</li>
</ul>
Then each action is as you have specified, however, the page template show_information.rjs would look like:
page.replace_html('extra_information', :partial => 'show_information')
Keep in mind you will need to have a placeholder to receive the partial contents, so simply wrap your optional sections in an element with a specific ID:
<div id="extra_information">
<% if #is_on_show_information %>
<%= render :partial => 'show_information' %>
<% elsif #is_on_show_signature %>
<%= render :partial => 'show_signature' %>
<% end %>
</div>