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How do I convert this jquery code to JavaScript?

This is the jquery code below:
$('div').on('click', function() {
$(this).toggleClass('show-description');
});
I want to convert it to JavaScript because I get this error message:
"$ is undefined "
when I put the jquery code in the JavaScript section of codepen.io.
Is there a reason the jquery code is producing an error? How can I fix this?
If it is not possible to fix, how can I convert the Jquery code to JavaScript?
I'm trying to use toggleClass on all the divs when the div is clicked.
Here is a link to the codepen for reference: https://codepen.io/sophiesucode/pen/jOExXKw

Option 1: Use should push the jquery lib above </body>, Here is your demo
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
Option 2: Use pure javascript like below
document.querySelector('div').onclick = function(){
this.classList.toggle("show-description");
};

$('div').on('click', function() {
$(this).toggleClass('show-description');
});
Can be represented by vanilla javascript as:
var divs = document.querySelectorAll('div'); //Get a list of all div elements
for (const div of divs){ //Loops through every div element
div.onclick = function(e) { //Adds the on click function to each
e.currentTarget.classList.toggle('show-description'); //Defines the function as toggling a class on the element of the click function
}
}
Jquery code actually is javascript. Jquery is a library built for javascript. To solve the error "$ is undefined" you would have to add jquery to your webpage, or import it in your script.
There is this wonderful article on W3 Schools which teaches multiple ways to add jquery to your webpages.

Your code doesn't work because you linked your script path as a relative path.
Change this
<script src="/assets/jquery.js"></script>
into this
<script src="https://code.jquery.com/jquery-3.4.1.min.js"></script>
another way is to link the jquery file using the settings menu in codepen.
Settings > Javascript > then search jquery in the CDNsearch bar

Run Javascript based on HTML class clicked

I have a tiny script I'm working on :)
The idea is if the span tag just contains autocompleteitem and not autocompleteitem autocompleteitemwithcontainer then it'll display the word hello. Right now it displays hello for both :(
Demo: https://jsfiddle.net/L33mqqtp/
$(document).ready(function() {
$(document).on('click','.autocompleteitem',function(){
$("div").show();
});
});
How do I update my code to do this?

Try this
'click','.autocompleteitem:not(.autocompleteitemwithcontainer)'

They both have .autocompleteitem class! To obtain what you want, use a different selector, which only applies to first one:
$(document).ready(function() {
$(document).on('click','.autocompleteitem:not(".autocompleteitemwithcontainer")',function(){
$("div").show();
});
});

try this
$(document).ready(function() {
$("span").on('click', function(){
if(this.className == "autocompleteitem")
$("div").show();
});
});

Use the attribute selector syntax. That will allow you to directly match an entire attribute. This way you don't have to make a bunch of different combinations for each thing that you don't want to be selected.
Example selector: jQuery('[class="autocompleteitem"]')
Working Example:
$(document).ready(function() {
$(document).on('click','[class="autocompleteitem"]',function(){
$("div.containertoshow").toggle();
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
Should work<br>
Should not work
<div class="containertoshow" style="display:none;">That button does toggle me on/off!</div>

innerHTML.replace works in jsfiddle but not in browser

I have such problem:
I have a software which make an order confirmation in .html . I had to figure out how to delate some strings which I do not want to have on confirmation. Because of fact that I have not enough knowledge, I made something like that :
<script type="text/javascript">
document.body.innerHTML=document.body.innerHTML.replace(/<div id="boxik"><div class="nazwa">SZ.*font>/, '');
</script>
Very unprofessional code to remove everything between some div, but it is enough for my solution. It works perfectly in jsfiddle, but not in any browser. Maybe I should load so jquery libary ? I am not sure it is why I am asking for help.
http://jsfiddle.net/LTfyH/79/

Be aware of the fact you're using the id boxik two times. You can only use a id once.
If you want to remove only one element you can use something like:
var el = document.getElementById('boxik');
el.parentNode.removeChild(el);
If you want to remove multiple elements you can select them based on a class for example:
var elementsToRemove = document.querySelectorAll('.remove-me');
A example of both methods:
http://jsfiddle.net/LTfyH/81/
Notice that i added the class remove-me on two elements.

Try to do it in the document onload if you are using pure javascript:
(function () {
document.body.innerHTML=document.body.innerHTML.replace(/<div id="boxik"><div class="nazwa">SZ.*font>/, '');
})();
Or if you are using jQuery:
$(function() {
document.body.innerHTML=document.body.innerHTML.replace(/<div id="boxik"><div class="nazwa">SZ.*font>/, '');
});

Auto click a link by class name using javascript or jquery?

I am trying to auto click a link using a class name instead of the ID name.
however my approach doesn't do anything!
Here is what I have done:
<script type="text/javascript">
$(document).ready(function(){
document.getElementsByClassName("some-iclass").click();
});
</script>
Could someone point me in the right direction please?
EDIT:
I've used the following code and still doesn't work:
<script type="text/javascript">
$(document).ready(function(){
$(".myLink").click();
});
</script>
<a class="myLink" href="http://yahoo.com"> CLICK HERE NOW </a>
and I have this right at the top of my page header:
<script src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.10.3/jquery-ui.min.js"></script>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
EIDT:
i've tried this as well and still doesn't work:
<script type="text/javascript">
$(document).ready(function(){
$('.myLink').trigger('click');
});
</script>

here you go:
<script type="text/javascript">
$(function(){
$('.className').trigger('click');
});
</script>
hope that helps.
UPDATE:
try:
<script type="text/javascript">
$(function(){
window.location.href = $('.className').attr('href');
});
</script>
after your edit, i think this is what you need.

getElementsByClassName doesn't return an element but a NodeList which may contain more than one element.
You may do this :
document.getElementsByClassName("some-iclass")[0].click();
or if you want to click all elements :
var list = document.getElementsByClassName("some-iclass");
for (var i=0; i<list.length; i++) list[i].click();
But as you use jQuery, it would be simpler to do
$('.some-iclass').click();
but only when the click event handler was added with jQuery (in other cases, like for example in case of an href attribute, use the standard dom functions).

$(document).ready(function(){
$(".some-iclass").trigger('click');
});

Simple with jquery $(".some-iclass").click();
if you have a lot of elements with this class - point to the wanted element:
i.e. $($(".some-iclass")[0]).click();

for auto-clicking a button or a link
"<"body onload="document.getElementById('some-class')[0].click()" ">"
this works...:)

if you want to autoclick a link and you are using jQuery, you could use
$('.yourClass').click();
if you need this to be one link in a collection of multiple links, you could do this:
$($('.yourClass')[0]).click();
Where 0 is the index of the element in the jQuery object.
document.getElementsByClassName('yourClass'); does not work in older browsers so it's best to use jQuery here for cross-browser compatibility.

For me, I managed to make it work that way. I deployed the automatic click in 5000 milliseconds and then closed the loop after 1000 milliseconds. Then there was only 1 automatic click.
<script>
var myVar = setInterval(function ({document.getElementById("test").click();}, 500);
setInterval(function () {clearInterval(myVar)}, 1000);
</script>

Run JavaScript function on element defined with jQuery

Not sure I titled this well.. show's that I'm in unfamiliar territory. How can I run a JavaScript function based off of the element called in a jQuery function?
Theory:
<script type="text/javascript">
$.fillit('video');
</script>
(run fillit on video tag present in page.. interchangable with other elements)
$.fillit = function(){
this is where it says "run on the tag defined in the jQuery function"
}):

$.fn.extend({
fillit : function(){...}
});
then...
$('.video').fillit();
Edit (after comments)
To fill a dom element with other elements/html:
var img = document.createElement('img');
img.setAttribute('src', 'somesrc.jpg');
$('.video').append(img);
or
$('.video').html('<img src="somesrc.jpg"/>');

You can do it the way you described like so
<script type="text/javascript" language="javascript">
$.fillit = function(content)
{
$("result").html(content);
}
//call function
$.fillit("HELLO WORLD");
</script>
or as Alexander just posted if you want to do it on the selected element.
I don't think adding functions directly to jquery with $.func = is a good idea though. If jQuery ever adds a fillit method your method will conflict with theirs.

technopeasant, it sounds like you are using a jquery plugin (in your example, a plugin called 'fillit') and it is asking you to run the plugin on a tag or series of tags. Sorry if I misunderstood your question.
If that is the case, all you need to do is one of two things. If you are trying to run it on a very specific element in the HTML page (one with an id like <div id="myvideo"></div>) then all you need to do is run:
$('#myvideo').fillit();
//Notice the '#' symbol, that looks up the element with an id of 'myvideo'
If you want to run the plugin on a series of elements (like all <p> tags in the entire document, you'd run something like:
$('p').fillit()
//notice no '#', it's just looking up all <p> tags regardless of ID.
Take a look at the jQuery documentation regarding selectors to get a more concrete idea of how these selectors work:
http://docs.jquery.com/How_jQuery_Works

Someone answered with a link to this: http://docs.jquery.com/Plugins/Authoring
exactly what I was looking for. claim your kudos!
(function( $ ){
$.fn.fillit = function() {
this.fadeIn('normal', function(){
var container = $("<div />").attr("id", "filled")
.appendTo(container);
});
};
})( jQuery );