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POReferenceError: $ is not defined function error
 

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  1. POReferenceError: $ is not defined function error
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    <p>I'm getting trouble with my jquery script .Who's suppose to count the number of character on the old twitter way . i'm getting <code>ReferenceError: $ is not defined</code> pointing </p> <pre><code>$(function() { </code></pre> <p>here is the script by the way i'm on a rails app .</p> <p><strong>index.hml.erb</strong></p> <pre><code>&lt;% title "Welcome #{current_user.username}" %&gt; &lt;script type="text/javascript"&gt; $(function() { $('#flit_message').keyup(function(){ var content_lenght = $(this).val().length; var remaining = 140 - content_length $('#char_count').html(remaining); }) }) &lt;/script&gt; &lt;%= form_for Flit.new, :html =&gt; {:id =&gt; 'new_flit_form'} do |f| %&gt; &lt;h3 style="float: left;"&gt;What are you doing?&lt;/h3&gt; &lt;h3 id="char_count" style="float: right;font-size: 23px; font-weight: bold; color: #aaa;"&gt;140&lt;/h3&gt; &lt;div class="clear"&gt;&lt;/div&gt; &lt;!-- &lt;div id="new_flit_form"&gt; --&gt; &lt;%=h f.text_area :message %&gt; &lt;div id="latest_message"&gt; &lt;strong&gt;Latest: &lt;/strong&gt;&lt;%=h @last_flits.message %&gt; &lt;%= distance_of_time_in_words_to_now(@last_flits.created_at)%&gt; ago &lt;/div&gt; &lt;div id="submit_button_container"&gt; &lt;%=h f.submit "update", :class =&gt; "button" %&gt; &lt;/div&gt; &lt;div class="clear"&gt;&lt;/div&gt; &lt;!-- &lt;/div&gt; --&gt; &lt;% end %&gt; &lt;ul id= "flits_list"&gt; &lt;% @flits.each do |flit| %&gt; &lt;li&lt;% if @flits.first == flit %&gt; class="first"&lt;% end %&gt;&gt; &lt;%= image_tag flit.user.gravatar_url %&gt; &lt;div class="flit_message_container"&gt; &lt;%=h link_to flit.user.username %&gt; &lt;%=h flit.message %&gt; &lt;div class="time_ago"&gt; &lt;%= distance_of_time_in_words_to_now(flit.created_at)%&gt; ago &lt;/div&gt; &lt;/div&gt; &lt;div class="clear"&gt;&lt;/div&gt; &lt;/li&gt; &lt;% end %&gt; &lt;/ul&gt; </code></pre> <p><strong>here is the application.js file</strong></p> <pre><code>// This is a manifest file that'll be compiled into application.js, which will include all the files // listed below. // // Any JavaScript/Coffee file within this directory, lib/assets/javascripts, vendor/assets/javascripts, // or vendor/assets/javascripts of plugins, if any, can be referenced here using a relative path. // // It's not advisable to add code directly here, but if you do, it'll appear at the bottom of the // the compiled file. // // WARNING: THE FIRST BLANK LINE MARKS THE END OF WHAT'S TO BE PROCESSED, ANY BLANK LINE SHOULD // GO AFTER THE REQUIRES BELOW. // //= require jquery //= require jquery_ujs //= require jquery-ui //= require_tree . </code></pre> <p><strong>html page source code</strong></p> <pre><code>&lt;!DOCTYPE html&gt; &lt;html&gt; &lt;head&gt; &lt;title&gt;Welcome breanne&lt;/title&gt; &lt;link href="/assets/application.css?body=1" media="screen" rel="stylesheet" type="text/css" /&gt; &lt;link href="/assets/flits.css?body=1" media="screen" rel="stylesheet" type="text/css" /&gt; &lt;link href="/assets/home.css?body=1" media="screen" rel="stylesheet" type="text/css" /&gt; &lt;link href="/assets/welcome.css?body=1" media="screen" rel="stylesheet" type="text/css" /&gt; &lt;script src="/assets/defaults.js" type="text/javascript"&gt;&lt;/script&gt; &lt;meta content="authenticity_token" name="csrf-param" /&gt; &lt;meta content="JnHvVRrW5Ts6TQf+D35OByvXxEY+Gl6P5NU5dVs8r3o=" name="csrf-token" /&gt; &lt;/head&gt; &lt;body&gt; &lt;div id="container"&gt; &lt;h1&gt;Welcome breanne&lt;/h1&gt; &lt;script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js" &gt; $(function() { $('#flit_message').keyup(function(){ var content_lenght = $(this).val().length; var remaining = 140 - content_length; $('#char_count').html(remaining); }) }) &lt;/script&gt; </code></pre>
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    1. COYou need to import jQuery with a `<script>` tag.
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    2. COhow do i do it .It suppose to be already define on the application.js file
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    3. COUpdated my answer, I think you need to uncomment the require jquery lines
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