Having difficulties with JavaScript in Rails 4, receiving the error message: "undefined is not a function"

I have been using the gem chosen-rails (or chosen-sass-bootstrap-rails) in my Rails application. In my gemfile, I included the following line:

gem 'chosen-sass-bootstrap-rails'

Previously, everything was functioning correctly, but now I am encountering this error message consistently and I am unsure of its cause:

[Error] TypeError: undefined is not a function (evaluating '$('.chosen-  select').chosen({
  allow_single_deselect: true,
  no_results_text: 'No results matched',
  width: '100%'
})')

This is how my application.js file looks:

//= require jquery
//= require jquery_ujs
//= require bootstrap

//= require jquery.turbolinks
//= require chosen-jquery
//= require scaffold
//= require jquery.purr
//= require best_in_place
//= require bootstrap-datepicker
//= require jquery-fileupload
//= require autocomplete-rails
//= require jquery-ui
//= require jquery.countdown
//= require autocomplete-rails
//= require bootstrapValidator.min

//= require turbolinks

//= require_tree .

In my application.css.scss file, I have included the following line:

*= require chosen_bootstrap

The HTML (or HAML) code appears like this:

= select_tag "tag", options_from_collection_for_select(@team_tags, 'name', 'name', params[:tag]), prompt: "All tags", class: 'form-control chosen-select select-ideas-tag', onchange: "window.location.replace('/teams/#{@team.id}/tags/' + this.value + '?search=#{params[:search]}');"

And here is what the JavaScript (or CoffeeScript) code looks like:

# enable chosen js
$('.chosen-select').chosen
  allow_single_deselect: true
  no_results_text: 'No results matched'
  width: '100%'

Can anyone provide insights into why it is failing to work?

Update

It seems that not only chosen-rails has ceased to function properly, but all of my JavaScript functionalities are not working as expected. Despite rebuilding and cleaning my assets, the issue persists.

I am uncertain about the root cause of this problem or how to diagnose it effectively.

Any suggestions on resolving this issue would be greatly appreciated.

Answer №1

Consider the Following:

One possible reason for the error could be including both jquery and chosen multiple times in your application. This duplication may lead to issues.

You can also attempt the following approach:

//= require jquery

//= require jquery.turbolinks

//= require jquery_ujs

//= require chosen-jquery

//= require scaffold

//= require jquery.purr

//= require jquery-ui

//= require bootstrap

//= require jquery.countdown

//= require turbolinks

//= require_tree .

Question why do you need both jquery.turbolinks and turbolinks? Try disabling turbolinks and see if that resolves the issue.

Answer №2

After some investigation, I discovered that jQuery was being included twice in my project. Specifically, it was present in both application.html and application.js. Removing the duplicate inclusion in application.html resolved the issue.

Answer №3

It seems that the issue with all JS stopping may be due to an error in your initialization code that is preventing further evaluation of the JS code. The presence of extra spacing between 'chosen- select' could indicate a nonprintable character causing the problem.

To troubleshoot the problem, consider following these steps:

  1. First, verify if JS is functioning by adding an alert popup before and after your code to see if it is being reached.
  2. Check if your initialization code is in the correct location, as Turbolinks has specific requirements for this. However, this may not be the issue until running the production version.
  3. The error message may not pinpoint the exact problem area. It could be that the 'select' section of the string is being evaluated. Try splitting the command and assigning an obviously incorrect value to ensure you are targeting the right property. Also, confirm if #('chosen-select') is returning a usable result.

Keep in mind that if this script crashes during initialization, other JS functions may not be executed afterward.

I hope this guidance helps steer you in the right direction...

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