How would you check if javascript is enabled in Rails? So that I could do something like this in the views:
<div>
<% if javascript_enabled? %>
<p>Javascript Enabled!</p>
<%- else -%>
<p>No Javascript</p>
<%- end -%>
</div>
php //Check if we should check for js if ((! isset($_GET['jsEnabled']) || $_GET['jsEnabled'] == 'true') && ! isset($_SERVER['HTTP_X_REQUESTED_WITH'])){ //Check to see if we already found js enabled if (!
You can detect it, but it isn't pretty.
First, you need a new controller with an action that updates a timeout in the session:
class JavascriptController < ApplicationController
def confirm
session[:javascript_updated] = Time.now
end
end
Next you need to include a javascript action in all your pages so this controller action is called on each page load. The easiest way is to include it on a "javascript-confirm.js" file included in your layout (on this particular example I used Prototype's Ajax.Request, so you need to have it included on your javascripts, too):
function confirmJavascript()
{
// Assuming you are using Prototype
new Ajax.Request('/JavascriptController/confirm');
}
myTimeoutFunction();
setInterval(myTimeoutFunction, 10000); // invoke each 10 seconds
This will invoke the confirm action in all your page views. Finally, you have to control how much time did it pass since your last confirmation in your application controller.
class ApplicationController < ActionController::Base
JAVASCRIPT_TIME_LIMIT = 10.seconds
before_filter :prepare_javascript_test
private
def prepare_javascript_test
if (session[:javascript_updated].blank? or
Time.now - session[:javascript_updated] > ApplicationController::JAVASCRIPT_TIME_LIMIT)
@javascript_active = true
else
@javascript_active = false
end
end
end
You will now have a variable called @javascript_active
in all your controllers.
It should work even when the user activates/deactivates javascript, with a precision of 10 seconds. It might not work if some of your pages take longer than 10 pages to load (i.e. with lots of images). Increase the time limit in that case (on applicationcontroller and your javascript)
Disclaimer: I haven't tested this code, some bugs might be lurking - but it should point you on the right direction.
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With