I'm stacked. Have model User and Event and also fullcalendar.
$(document).ready ->
$("#calendar").fullCalendar(
events: '/events.json'
)
Here is my coffeescript file but it doesnt work because it needs to be events: '<%=#user.id%>/events.json'. But ruby-code can't be in coffeescript file, so I need to get user_id.
How should I do this?
It is possible when the html is being generated. One way is to put in the bottom of your file js code which assigns user's id to globally available configuration and then read this id from this variable.
for example in your erb
<%= javascript_tag do %>
window.Configuration = {};
window.Configuration.UserId = <%= #user.id %>
<% end %>
And later in your coffee file
events: "#{window.Configuration.UserId}/events.json"
Related
I've seen some similar question, but still don't know how achieve my goal.
I want to do that thing:
Display modal with products represented by divs.
User choose some products (I add .active class to chosen products)
Then I use jQuery to make array of chosen products ids.
In the end I want to create div for each product, which will be include some informations about this product from database. I'm using js .append() to do it. And here is a problem.
This code is in my script tag in proper view.
var chosen_products_array;
$('.product-to-choose').click(function() {
$(this).toggleClass("active");
$(this).find('i').toggleClass("visible");
});
$('#chosen-products-confirm').click(function() {
var chosen_products = $('.product-to-choose.active');
chosen_products_array = jQuery.makeArray( chosen_products );
});
$('#confirm').click(function() {
var textToInsert = '<div><h4>Products:</h4>';
$.each(chosen_products_array, function(count, item) {
var id = $(item).attr('id').substr(8); // id is product_number
textToInsert += '<div><li name="chosen-product"> <%= current_user.products.find(' + id +').name %></li></div>';
});
textToInsert += '</div>';
$('#div-example').append(textToInsert);
});
My controller create action:
def create
#meal = current_user.meals.build(meal_params)
if #meal.save
current_user.type_tags.each do |type_tag|
key = "type#{type_tag.id}"
if params[key]
#meal.type_tags << type_tag # zapis do bazy danych
end
end
flash[:success] = "Create new meal!"
redirect_to meals_path
else
#render 'meals/new'
end
end
This line generates error:
textToInsert += '<div><li name="chosen-product"> <%= current_user.products.find(' + id +').name %></li></div>';
Error:
Couldn't find Product with 'id'=+id+ [WHERE "products"."user_id" = ?]
I know there is a problem in passing js variables to rails erb, but how can I solve it in this case? I tried with gon too.
In my controller, I added:
gon.products = current_user.products
and then try
alert(gon.products)
it's ok - array of objects, but when I try
alert(gon.products.find(1))
it doesn't work.
Have you got any idea how can I put this javascript id variable to erb code? Or maybe is any different solution?
Probably the best would be to add a remote form (it may be hidden) that posts whatever you want (javascript values) and then it is handled by a controller. Then you can render it with js views.
This would probably be the most "rails-like" solution.
Here's some code:
In the routes:
resource :my_form, only: :create
In the view:
<%= form_tag(my_form_path, remote: true, method: :post) do %>
<%= hidden_field_tag :val %>
<% end %>
You alter the val dynamically by javascript, and submit the form whenever you want to.
Then, in the controller you have something like this:
respond_to :js
def create
# do something with params['val']
#my_val = params['val']
end
And you would also add create.js.erb view, where you could add some javascript that can use any of the instance variables created in the controller.
//create.js.erb
$('#someElement').html('<%= #my_val %>');
Let me stress if it is not clear, the form is remote (ajax), so it is sent in the background and the page is not reloaded.
When the browser receives the response, it may contain any javascript you decide to render (the contents of create.js.erb), and then the browser executes that javascript.
So, you can add there any jquery commands with arguments that you changed dynamically by rails, or you could also render html partials and replace any elements with them, like this:
//create.js.erb
$('#my_id').html('<%= j(render partial: 'my_form/_some_partial.html.erb', locals: { my_val: #my_val }) %>');
More details on Working with JavaScript in Rails
UPDATE
Another, inferior but simpler to implement solution would be to always render all products, but have them hidden initially, and then show them by jQuery on demand. You would just need to add appropriate css classes or data attributes to those products, as well as the links you use to select them.
The problem is that erb code is evaluated on the server before the browser even fetches the javascript file, so it doesn't make sense to use this way. It's recommended that you only use erb in your javascript for simple things like asset_path
I think first make your model visible to the browser as js variable(json object) . Some thing like below at the end of your view file(below is the haml syntax):
:javascript
var userProducts = #{#current_user.products.to_json};
Then use it in javascript expression
I'm trying to use some View instance variables inside Javascript.
My JS file is included in the head tag of my HTML. And it's a *.js file in assets/javascript.
When I try to...
console.log(<%= #some_instance_variable %>)
... I get syntax error. And if I try to...
console.log('<%= #some_instance_variable %>')
... the output is just the string <%= #some_instance_variable %>. How can I do to obtain the instance variable's actual value?. I'd really appreciate any help!.
Regards!.
You can include it with:
<%= javascript_include_tag('file_name.js.erb'.sub('.erb', '')) %>
But in fact it's a very ugly solution. If you want to use rails variables in JS scripts, use gon gem.
I have the next variable in my main_controller.rb:
def create:
#token = "24vgd32"
end
in my views/create.erb, I wrote:
<%= javascript_tag do %>
window.my_token = '<%= j #token %>';
<% end %>
by this way, I can use this variable in any of the JavaScript files that this page references.
but how can I use it in my application.js?
this is my application.js:
$(document).ready(function(){
licensario.getLicense({
wizardToken: my_token
});
});
any help appreciated!
In your create.html.erb use this
<%= hidden_field_tag :my_token, #token, :id => 'some_field_id' %>
replace the some_field_id and my_token with desired names.
In your javascript file
$(document).ready(function(){
token = $('#some_field_id').val();
//use your token for any other means.
});
I see 3 ways :
You can use erb in your js file, naming it application.js.erb. However, the data you want to pass must be available when the file is compiled, so this is probably not what you want to do;
You can make a XHR request to your server to fetch the value you want;
You can embed the value in the dom of your view. Some will suggest using a hidden field, I rather tend to use data attributes. For instance, <body data-my-value="32">.... You can retrieve it in your js by doing $('body').data('my-value'). Be careful to call this once the dom is loaded.
I tend to use the latter.
window.my_token makes my_token a variable on the global scope; once it's been defined it is available to application.js as simply my_token.
I am having problems returning javascript from helper functions. I am unable to get the following test case to work:
function in helpers/application_helper.rb
def show_stuff
return '$("div#flash").html("<p> stuff </p>");'
end
now I try to call this helper function in general.js.erb
<%= show_stuff %>
Here is the output
$("div#flash").html("<p> stuff </p>");
I've also tried show_stuff.html_safe and raw show_stuff and had no luck. I feel the issue is Rails auto-escaping html but have been unable to find a solution.
ERB is escaping the characters in your outputted Javascript.
To prevent this happening use the raw method in your template.
<%= javascript_tag do %>
<%= raw(show_stuff) %>
<% end %>
I've added the javascript_tag method around this for context.
When rendering a javascript file (not RJS, just a regular JS file) from a rails controller, is there a way to pass variables to it, which can then be used by functions in the JS file being called? I've tried :locals => {} but that doesn't work.
If you're rendering inside a js file you should use rjs. If you really don't like rjs (understandable) then how about rendering your variables first, then including your script?
<% javascript_tag do %>
var my_var = <%= #my_var.to_json %>;
<% end %>
<% javascript_include_tag 'your-js-file-that-expects-my_var-to-exist.js' %>