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How to link JS function to a Bootstrap Text Input Modal?

I have a basic Bootstrap Modal on my page with a text input field, which I will want to trigger upon clicking the "Report A Bug" button shown above.
<div class="btn-group" id="exampleModal" role="group">
<button id="myBtnToReportABug" type="button" class="btn btn-secondary" data-toggle="modal" data-target="#exampleModal"> Report A Problem </button>
</div>
<div class="modal" tabindex="-1" role="dialog">
<div class="modal-dialog" role="document">
<div class="modal-content">
<div class="modal-header">
<h5 class="modal-title">Please Provide A Short Description Of The Issue</h5>
<div class="input-group">
<textarea class="form-control" aria-label="With textarea"></textarea>
</div>
<button type="button" class="close" data-dismiss="modal" aria-label="Close">
<span aria-hidden="true">×</span>
</button>
</div>
<div class="modal-body">
<p>Modal body text goes here.</p>
</div>
<div class="modal-footer">
<button type="button" class="btn btn-primary">Send Report</button>
<button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
</div>
</div>
</div>
</div>
However I'm not sure of the best way to trigger it in Javascript. As you can see project already has a call to a modal, but its not a modal that is created in the HTML as I have with this 'Report A Bug' one.
$("#myBtnToReportABug").click(() => openModalPopup(cCenterUrl));
EDIT
Tried the Data Target method as mentioned below due to it's simplicity, but my Modal is not hidden nor does the click of the button trigger the modal to appear, any ideas?
<div class="btn-group" role="group">
<button id="myBtnToCcenter" type="button" target= '_blank' class="btn btn-primary"> Open CCenter </button>
<button id="myBtnToReportABug" type="button" target= '_blank' class="btn btn-secondary" data-toggle="modal" data-target=".modal-report"> Report A Problem </button>
</div>
<div class="modal-report" tabindex="-1" role="dialog">
<div class="modal-dialog" role="document">
<div class="modal-content">
<div class="modal-header">
<h5 class="modal-title">Report A Bug</h5>
<button type="button" class="close" data-dismiss="modal" aria-label="Close">
<span aria-hidden="true">×</span>
</button>
</div>
<div class="modal-body">
<p>Modal body text goes here.</p>
</div>
<div class="modal-footer">
<button type="button" class="btn btn-primary">Send Report</button>
<button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
</div>
</div>
</div>
</div>

You trigger the modal with: data-target="#exampleModal"
Then you also need the right modal:
<div class="modal fade" id="exampleModal" tabindex="-1" role="dialog" aria-labelledby="exampleModalLabel" aria-hidden="true">
Programmatically you have to do this
$('#exampleModalLabel').modal('show');
You previously need to initialize it with show: false so it won't show until you manually do it.
$('#exampleModalLabel').modal({ show: false})
Where exampleModalLabel is the id of the modal container.

How to make just a part of html 'tabbable'? (Modal Dialog)

I have an Angular App and a custom Modal Dialog implementation. How can I limit the 'tabbablity' of the page so that i can just tab through the Modal, and not everything else in background?
I have set aria-hidden="true" for all other elements directly under the body tag, and thought that has to handle that, but no success. tabindex="-1" also did not work..
Actually I want the exact tab-behaviour of this bootstrap modal:
https://getbootstrap.com/docs/4.0/components/modal/
Click: "launch demo modal" and tab through the modal elements..
How can I achieve this?
Edit: I look at the bootstrap modal, and they do not set anything to other elements, but just to the modal container div (with class="modal fade show") tabindex="-1". And after the last element in modal, tab sets focus to this modal container div. After that the focus is set again to the first modal element. In my case tabindex="-1" strangely does not bring anything, after the last element focus jumps to the Browser's URL Input field and goes on.

I dont know what code you have...but this tabindex behavior works well with bootstarp example.
.modal-backdrop {
background-color: transparent !important;
}
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" rel="stylesheet"/>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"></script>
<!-- Button trigger modal -->
<button type="button" class="btn btn-primary" data-toggle="modal" data-target="#exampleModal">
Launch demo modal (with tab only on modal elements)
</button>
<!-- Modal -->
<div class="modal fade" id="exampleModal" tabindex="-1" role="dialog" aria-labelledby="exampleModalLabel" aria-hidden="true">
<div class="modal-dialog" role="document">
<div class="modal-content">
<div class="modal-header">
<h5 class="modal-title" id="exampleModalLabel">Modal title</h5>
<button type="button" class="close" data-dismiss="modal" aria-label="Close">
<span aria-hidden="true">×</span>
</button>
</div>
<div class="modal-body">
coucou
</div>
<div class="modal-footer">
<button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
<button type="button" class="btn btn-primary">Save changes</button>
</div>
</div>
</div>
</div>
<br><br><br>
<!-- Button trigger modal -->
<button type="button" class="btn btn-primary" data-toggle="modal" data-target="#exampleModal2">
Launch demo modal (with tab on all document elements)
</button>
<!-- Modal -->
<div class="modal fade" id="exampleModal2" role="dialog" aria-labelledby="exampleModalLabel" aria-hidden="true">
<div class="modal-dialog" role="document">
<div class="modal-content">
<div class="modal-header">
<h5 class="modal-title" id="exampleModalLabel">Modal title</h5>
<button type="button" class="close" data-dismiss="modal" aria-label="Close">
<span aria-hidden="true">×</span>
</button>
</div>
<div class="modal-body">
coucou
</div>
<div class="modal-footer">
<button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
<button type="button" class="btn btn-primary">Save changes</button>
</div>
</div>
</div>
</div>

Bootstrap modal not showing up, screen just has black overlay

I'm trying to get a modal to show on my bootstrap site, and when I click the button to trigger it the screen turns dark, but nothing shows up.
<!-- Button trigger modal -->
<button type="button" class="btn btn-primary" data-toggle="modal" data-target="#exampleModal">
Launch demo modal
</button>
<!-- Modal -->
<div class="modal fade" id="exampleModal" tabindex="-1" role="dialog" aria-labelledby="exampleModalLabel" aria-hidden="true">
<div class="modal-dialog" role="document">
<div class="modal-content">
<div class="modal-header">
<h5 class="modal-title" id="exampleModalLabel">Modal title</h5>
<button type="button" class="close" data-dismiss="modal" aria-label="Close">
<span aria-hidden="true">×</span>
</button>
</div>
<div class="modal-body">
...
</div>
<div class="modal-footer">
<button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
<button type="button" class="btn btn-primary">Save changes</button>
</div>
</div>
</div>
</div>
This is the javascript I'm using as well, in addition to JQuery, popper.js, bootstrap js
$('#myModal').on('shown.bs.modal', function() {
$('#myInput').trigger('focus')
})
I literally took this right off the bootstrap site and for some reason it's not working.
$('#myModal').on('shown.bs.modal', function() {
$('#myInput').trigger('focus')
})
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/css/bootstrap.min.css" rel="stylesheet" />
<!-- Button trigger modal -->
<button type="button" class="btn btn-primary" data-toggle="modal" data-target="#exampleModal">
Launch demo modal
</button>
<!-- Modal -->
<div class="modal fade" id="exampleModal" tabindex="-1" role="dialog" aria-labelledby="exampleModalLabel" aria-hidden="true">
<div class="modal-dialog" role="document">
<div class="modal-content">
<div class="modal-header">
<h5 class="modal-title" id="exampleModalLabel">Modal title</h5>
<button type="button" class="close" data-dismiss="modal" aria-label="Close">
<span aria-hidden="true">×</span>
</button>
</div>
<div class="modal-body">
...
</div>
<div class="modal-footer">
<button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
<button type="button" class="btn btn-primary">Save changes</button>
</div>
</div>
</div>
</div>
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.3/umd/popper.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/js/bootstrap.min.js"></script>

The code snippet for the modal is perfectly fine, Check the parent div for both trigger and the modal and raise their z-index, It very likely that the Z-Index of the parent element is interfering with the modal pop up. You can try this`
.parentElementOfModal{
z-index:10000;
}

Bootstrap modal new page

I want to make a modal where in if I click the button the modal pops up and the content of the modal is from a different page. Please help me.
This is my code
Click to open Modal
<div class="modal fade" id="basicModal" tabindex="-1" role="dialog" aria-labelledby="basicModal" aria-hidden="true">
<div class="modal-dialog">
<div class="modal-content">
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal" aria-hidden="true">×</button>
<h4 class="modal-title" id="myModalLabel">Basic Modal</h4>
</div>
<div class="modal-body">
<h3>Modal Body</h3>
</div>
<div class="modal-footer">
<button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
<button type="button" class="btn btn-primary">Save changes</button>
</div>
</div>
</div>
</div>
I want to know what Javascript? and where exactly should I put it?
I'm using bootstrap v 3.03 by the way.

I think this is what you're looking for. You need to pay special attention to this line in particular:
<a data-toggle="modal" class="btn btn-info" href="remote.html" data-target="#myModal">Click me !</a>

Bootstrap and problems with its modal

I have a problem with bootstrap,
I included my modal with these lines of code (I use Jade):
<button data-toggle="modal" href="#myModal" class="btn btn-primary">Launch demo modal</button>
<div id="myModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true" class="modal fade">
<div class="modal-dialog">
<div class="modal-content">
<div class="modal-header">
<button type="button" data-dismiss="modal" class="close"><span aria-hidden="true">×</span><span class="sr-only">Close</span></button>
<h4 id="myModalLabel" class="modal-title">Modal title</h4>
</div>
<div class="modal-body">...</div>
<div class="modal-footer">
<button type="button" data-dismiss="modal" class="btn btn-default">Close</button>
<button type="button" class="btn btn-primary">Save changes</button>
</div>
</div>
</div>
</div>
When I click the button it opens the modal, but when I should close the modal, it just close the modal and leave overlay! I really don't understand why it happens...
These are the screenshot before and after close the modal:
BEFORE:
http://i.stack.imgur.com/UkcSe.jpg
AFTER:
http://i.stack.imgur.com/1Uovr.jpg
According to you what is the problem?
ps: don't touch behind, it still doesn't work well :p