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How to make use of an external Js file in .net core 2.1 and Angular 6

I am new to Angular 6 and .Net Core 2.1. I've created a some application but now I need to make use of jquery events. I have installed Jquery packages to node_modules as well.
Could anyone please help me!!
Thanks in advance
Even in the angular-cli.json file, I've added the jquery files and my custom js file.
But still not working.
Below are my configuration and code
Solution Structure

You will find here an example link
I would recommend to keep JQuery out of your Angular project. You have to understand how Angular 2+ works and you will see that there is no need for JQuery.
With JQuery you were selecting an element in the page and modify it but with Angular the UI changes based on a model property. It is another way of thinking about the UI.
You can read more about the differences between the two here link. I also tried to use JQuery when I began using Angular because of my previous experience but I learned that was a mistake.

if you want to use jQuery u will need to put the files in the wwwroot folder. You can link it from there.

How to use external js library functions in Angular 7 project?

We are creating one project in angular 7. We want to use jquery based library as image picker.
We have imported the library correctly as
import * as 'image-picker' from '..asset/image-picker.min.js'
Also it has been imported as script in index.js with correct path.
Now we are getting stuck about the correct use of this file in Typescript environment.
For example how to use the below example method of the above library in
Angular Module in component and templates.

You CANNOT use jquery based libs in Angular context.
It was clearly not a good practice with the old fashionned AngularJS 1.**, now it's not even possible.
EDIT :
According to this source, it's seem's possible.
But for me, it's clearly not a good idea to insist on using Jquery with Angular 7

I saw this library using jquery so
If you using external library you need to include script of that library in your website using script tag or if you using angular cli you need to edit your angular.json and include that script
then use it in your method
$("select").imagepicker()
You can go to my blog to read detail how to integrate third party library to angular here

Using jquery 2.2.2 in a grails project

I'm trying to change javascript library versions in a grails project to use compatible versions. We've added Angularjs 1.5.2 to the project. That requires jquery 2.1+ (https://docs.angularjs.org/misc/faq). We're currently using jquery 1.10.2, but 2.2.2 is the latest. The grails way to update this is to edit BuildConfig.groovy and run grails refresh-dependencies. HOWEVER, the grails jquery plugin only supports jquery up through 1.11.1. (https://grails.org/plugin/jquery) Is there a proper grails way to address this?
I'm using grails 2.2.5.

I applied #vahid's suggestion. First step was to download jquery and jquery-ui, and put the necessary files in place. For us, that was:
js/libs/jquery-1.10.2.min.js
js/libs/jquery-ui-1.10.4.custom.min.js
css/blitzer/jquery-ui.custom.css
Then, removed the grails-jquery plugin references from BuildConfig.groovy:
runtime ":jquery:1.10.2"
compile ":jquery-ui:1.10.4"
And added the jquery and jquery-ui modules to Config.groovy:
jquery {
resource url: 'js/libs/jquery-1.10.2.min.js'
}
'jquery-ui' {
resource url: 'js/libs/jquery-ui-1.10.4.custom.min.js'
resource url: 'css/blitzer/jquery-ui.custom.css'
}
The ticks around jquery-ui are essential. I removed our jquery-theme override as well.
The final step was to adjust the versions as needed.

Bootstrap framework without jquery

I have requirement to develop a front end project. I am planning to use angular + bootstrap. I don't have to use jquery, but bootstrap javascript components require jquery. my question is,
1)Can we have bootstrap built on javacript.
2)Can we have bootstrap built on angular.
please provide related good documents on any above two related topics.

For angular project you can user UI Bootstrap which have bootstrap CSS file with a set of native AngularJS directives.It does not require jQuery or Bootstrap's Javascript.The only required dependencies are:
AngularJS
Angular-animate
Bootstrap CSS
Check it here

Have no worry, the internet is full of scripts and tutorials, native JavaScript is the coolest programing language ever! Far more powerful and requires almost zero maintenance on very long periods of time.
Also some features are even better.
If you are looking for Bootstrap without jQuery or vanilla Javascript for Bootstrap, you can use bootstrap.native

The Bootstrap plugins are jQuery plugins, so no, strictly speaking, you can't use them without jQuery. There is this project, however, which may help you.

When building out Angular projects, you should not add on the full jQuery library. jQlite is already included in Angular and this should be all the jQuery that is necessary.
Reference

Which is the right way to add Jquery and Angularjs in one project

I am starting to add Jquery and AngularJs in our next project.
I seen some article say use Jquery before AngularJs and Some article used Jquery after AngularJs. so, I am little confuse about which one is right.
see KendoUI used jquery before AngularJs and their own library after it.
<script src="jquery.min.js"></script>
<script src="angular.min.js"></script>
<script src="kendo.all.min.js"></script>
What is the concept behind use jquery before AngularJs and Kendo or other library after AngularJs.
And why kendoUI will not work if we use it before AngularJs, what is the concept behind it.

Angular can work with or without jQuery. If loaded without jQuery already loaded, it'll use jQLite which only has a handful of jQuery functions. Reference
So if you plan to use jQuery in your JS it makes sense to load it before Angular which will prevent jQLite from being loaded at all.
Kendo UI includes Angular directives, which won't work correctly unless the Angular framework is loaded before it.
The same principle would apply to any library that uses the Angular framework. If a library does not use it then the load order has no effect.

If you load jQuery after AngularJS, AngularJS attaches itself to jqLite but you can still access jQuery through $. This is not a good situation to be in. If you are going to use jQuery then you should always load it before AngularJS.