Which files should be included to define the variable $? in jQuery/JavaScript?

I am looking to create a sliding Div over another div in a simple way. The example provided in this Fiddle is exactly what I have in mind, but as someone new to coding, I encountered the warning 

Uncaught ReferenceError: $ is not defined
after transferring the code to my own files.

<div class="hidden" id="slide">INFORMATION ABOUT IMAGE APPEARS ON CLICK</div> 
<div class="image"><br>THERE'S A NICE IMAGE HERE</div>

$(document).ready(function() {$('#slide').click(function() {
var hidden = $('.hidden');
if (hidden.hasClass('visible')) {
  hidden.animate({"top": "160px"}, "slow").removeClass('visible');
} 
else {
    hidden.animate({"top": "0px"}, "slow").addClass('visible');
}
});
});

It's clear to me now that I need to link one or more files in the HTML head to define my $. Can anyone assist me in identifying the correct files and guiding me on how to incorporate them into my html?

javascriptjqueryhtmlcss

Answer №1

Looks like you are currently utilizing jQuery without importing it. To start using jQuery, make sure to include the jQuery library in your code:

<script src="https://code.jquery.com/jquery-2.2.1.min.js"></script>

Answer №2

For those looking for the jQuery distribution file, it can be found here or on various CDNs.

The code in your question now includes jQuery to address the issue of '$' not being defined. While this doesn't fully resolve the problem of clicking a hidden element, it marks progress towards a solution.

$(document).ready(function() {
  $('#slide').click(function() {
    var hidden = $('.hidden');
    if (hidden.hasClass('visible')) {
      hidden.animate({
        "top": "160px"
      }, "slow").removeClass('visible');
    } else {
      hidden.animate({
        "top": "0px"
      }, "slow").addClass('visible');
    }
  });
});
<div class="hidden" id="slide">INFORMATION ABOUT IMAGE APPEARS ON CLICK</div>
<div class="image">
  <br>THERE'S A NICE IMAGE HERE</div>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>

If you're looking to gain a deeper understanding of these concepts, I suggest going through tutorials as Stack Overflow is primarily meant for questions and answers.

Answer №3

In order to use the $ sign, it is necessary to load jQuery first.

One way to ensure jQuery is loaded before you start using it is by including the following script at the beginning:

<script src="http://code.jquery.com/jquery-latest.min.js" type="text/javascript"></script>

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