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$(...).sideNav is not a function

I have just downloaded mdbootstrap. Upon following the instructions for implementing a side-nav on my webpage I get the following error when I try to initialize it:
Uncaught TypeError: $(...).sideNav is not a function
at index.html:133).
Kindly help. I have tried rearranging the order of my files but this doesn't seem to help.
<script type="text/javascript" src="js/mdb.min.js"></script>
<script>
$(".button-collapse").sideNav();
var sideNavScrollbar = document.querySelector('.custom-scrollbar');
Ps.initialize(sideNavScrollbar);
</script>

Watch out, the sideNav component is only for pro users.
Perhaps you try to import a premium component with the "cheap" version of mdbootstrap

You need to load jQuery first.
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script type="text/javascript" src="js/mdb.min.js"></script>
<script>
$(".button-collapse").sideNav();
var sideNavScrollbar = document.querySelector('.custom-scrollbar');
Ps.initialize(sideNavScrollbar);
</script>
And make sure you refresh the file in the web browser without cache. You can refresh it by hiting Shitf + F5 in Chrome.

You need to load jQuery sideNav first. Do like this:
$(function(){
const Ps = new PerfectScrollbar();
$(".button-collapse").sideNav();
var sideNavScrollbar = document.querySelector('.custom-scrollbar');
Ps.initialize(sideNavScrollbar);
})

jQuery not running locally

I have the following links declared inside the head tag:
<script type="text/javascript" src="javascript/jquery-3.1.0.min.js"></script>
<script type="text/javascript" src="javascript/scripts.js"></script>
And the following code inside the scripts file:
$("#person").hover(function() {
// trigger the mouseover event
$("#person-text span").addClass("important-info");
}, function() {
// trigger the mouseout event
$("#person-text span").removeClass("important-info");
});
$(document).ready(function(){
console.log( "ready!" );
});
I have also tried adding the jQuery library through Google and Microsoft CDNs, but it didn't work as well.
Here is a screenshot from the console errors:

I had a similar problem few days back. I moved the custom script tag at the end of the HTML page and the code worked. It generally happens for the $(document).ready() function.
<script type="text/javascript" src="javascript/scripts.js"></script>
Move the above line to the end of your Html page and that should work.

try using $(document).ready(function(){/*your code*/}) and try to change if your browser console showing 404 error for jQuery file
<script type="text/javascript" src="javascript/jquery-3.1.0.min.js"></script>
to
<script type="text/javascript" src="https://code.jquery.com/jquery-3.1.0.min.js
"></script>

Boostrap lightbox not working as expected

I'm trying to get a functional lightbox to work on my page using code from 'bootply.com/' but it does't seem to work. It works as a link, but not as a lightbox. I get an error relating to the Javascript which states '$ is not defined', but I can't seem to locate the issue. I'm simply replicating the code, so not sure what I'm missing!
<script type="text/JavaScript">
$('.thumbnail').click(function(){
$('.modal-body').empty();
var title = $(this).parent('a').attr("title");
$('.modal-title').html(title);
$($(this).parents('div').html()).appendTo('.modal-body');
$('#myModal').modal({show:true});
});
http://www.bootply.com/71401
Any help is appreciated.

you have to include jQuery.
if you have jQuery lib then
<script src="jquery-1.11.2.min.js"></script>
or
use jQuery CDN
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.min.js"></script>

You are missing the jQuery library..
Include this in the top of your HTML before you attempt to use the $
<script src="https://code.jquery.com/jquery-2.1.3.min.js"></script>
Alternatively you can download the jQuery library and reference it yourself.
This should resolve the issue.

$('body').layout is not a function

I'm using the jQuery UI Layout plugin and I keep getting this error in Firebug: $('body').layout is not a function. I also get the same error in IE8 and below.
Obviously, it's being caused by the line where I initiate the layout UI in my scripts file:
$('body').layout({ *options here* });
Is there a way to prevent this error from showing? I'm pretty sure I need the BODY selector for this particular plugin to run.
** SOLUTION **
As the helpful answers say below, I had this line: $('body').layout({ *options here* }); BEFORE I included my jQuery and jQuery UI Layout Plugin files. Once I put the body.layout after those two inclusions, the error went away.

You seem to either
1) have not included the plugin properly (script tag missing/typo in the url, included it before loading jquery itself, whatever else could go wrong)
 or
2) calling $("body").layout too early - wrap it with $(document).ready(function() { });
it should be
<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript" src="jquery.layout.js"></script>
...
<script type="text/javascript">
$(document).ready(function() {
$("body").layout() // will work now
});
</script>

Make sure you're including the lines:
<SCRIPT type="text/javascript" src="/path/to/jquery-latest.js"></SCRIPT>
<SCRIPT type="text/javascript" src="/path/to/jquery.layout-latest.js"></SCRIPT>
Prior to the code you placed in your question. Otherwise, layout will have been undefined before use.

jQuery tooltip is not working

I want a tooltip to show when I rollover on particular links. It's not working. The commented out alert is working, so event is not the issue. This is my javascript code:
$(window).load( function() {
$("a").each(function() {
if(this.text==" View image") {
$(this).mouseover(function() {
// alert("blabla");
$(this).tooltip();
});
}
});
});
on my html file the includes are:
<script type="text/javascript" language="javascript" src="http://code.jquery.com/jquery-latest.js"></script>
<script type="text/javascript" language="javascript" src="jquery.tooltip.min.js"></script>
<script type="text/javascript" language="javascript" src="mainscript.js"></script>
I'd appreciate some help.
UPDATE: removing mouseover doesn't help

Remove the mouseover function. The plugin doesn't require you to add a custom mouseover function. It's done from the plugin for you.
if(this.text==" View image") {
$(this).tooltip();
}
Hope this helps ^^
Change the main jQuery function to $(document).ready(function(){});
This will probably work now~

Try this:
$("a").each(function() {
if(this.innerHTML == " View image") {
$(this).tooltip();
}
}
Also, there's a space before the View in "View image". I'm not sure if that's intentional or not.

I used jQuery tipsy on my recent projects. Quite easy to understand and integrate.