bootstrap 4: form validation not working - html

Question

link to plunker
This is what I am trying to implement.
I am using Bootstrap 4. I have a simple contact form. I am trying to implement tooltip validation.
The form validation is not working. It does not show any tooltip validation or any validation for the matter.
Below is the markup. I have all the required css and script files in my index.html
contact.html
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.3/css/bootstrap.min.css" integrity="sha384-Zug+QiDoJOrZ5t4lssLdxGhVrurbmBWopoEl+M6BdEfwnCJZtKxi1KgxUyJq13dy" crossorigin="anonymous">
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.3/js/bootstrap.min.js" integrity="sha384-a5N7Y/aK3qNeh15eJKGWxsqtnX/wWdSZSKp+81YjTmS15nvnvxKHuzaWwXHDli+4" crossorigin="anonymous"></script>
<div ngController="contactController as vm">
<div class="heading text-center">
<h1>Contact Us</h1>
</div>
<div>
<form class="needs-validation" id="contactForm" novalidate name="contactForm" ng-submit="$ctrl.submitRequest();">
<div class="form-group row">
<label for="validationTooltip01" class="col-sm-2 col-form-label">Name</label>
<div class="input-group">
<input type="text" class="form-control" id="validationTooltipName" placeholder="Name" ng-model="$ctrl.details.name" required>
<div class="invalid-tooltip">
Please enter your full name.
</div>
</div>
</div>
<div class="form-group row">
<label for="validationTooltip01" class="col-sm-2 col-form-label">Email</label>
<div class="input-group">
<input type="text" class="form-control" id="validationTooltipName" placeholder="Name" ng-model="$ctrl.details.email" required>
<div class="invalid-tooltip">
Please enter an email.
</div>
</div>
</div>
<div class="form-group row">
<label for="validationTooltip03" class="col-sm-2 col-form-label">Query</label>
<div class="input-group">
<input type="text" class="form-control" id="validationTooltipQuery" ng-model="$ctrl.details.query" placeholder="Query" required>
<div class="invalid-tooltip">
Please write your Query.
</div>
</div>
</div>
<div class="btn-group offset-md-5">
<button class="btn btn-primary" type="submit">Submit</button>
<button class="btn btn-default" type="button" id="homebtn" ng-click="navigate ('home')">Home</button>
</div>
</form>
<span data-ng-bind="Message" ng-hide="vm.hideMessage" class="sucessMsg"></span>
<div>{{$ctrl.details | json}}</div>
</div>

Answer 1

Your code modification is here for :
<https://plnkr.co/edit/r3ABqG3OcmCBczCJjxBa?p=preview >
this is link to plnkr , its so hard to include link , Sorry for design but this works , This is your code , i just did some change in form