angularjs | angular angularjs angularjs1.x angular1 | Command Line Interface library

After AngularJS update to 1.8, once I click and call DayTypechange(2) method, the radio button value does not update. Here is my html:

Here's my angularjs Controller

I'm trying to make a very simple websocket service in Angular 12 but I can't seem to find any working examples. I have tried a number of tutorials including this more recent one, but even the example they give does not seem to be working for me (I have tried to implement it on my own, and have also tried to git clone their example. Neither have worked)

I am trying to learn Angular 12 by porting an old AngularJS app in which I used websockets and the ng-websocket package. RxJS seems to one of the more popular libraries used for websockets so I went with that. So far I have only been able to get the following example working:

I'm working in an Angular 11 Project.

I know there's the ngIf directive, which will only show the html element if set to true, but doesn't preserve spacing.

In the old AngularJS, there was ng-show and ng-hide. These properties would show/hide an element, but keep its spacing (effectively setting the css to visibility to hidden). But Angular no longer has those properties. Instead they recommend binding to the hidden property (https://angular.io/guide/ajs-quick-reference#ng-show).
However, this doesn't preserve the spacing (which is strange IMO).
Does Angular have a directive that hides the element while also preserving its spacing?

I can add a conditional class, where the class has a visibility of hidden, but I trying to confirm if Angular has a directive/property for this.

I wiped up a demo here: https://stackblitz.com/edit/hide-element-angular?file=src/app/autocomplete-auto-active-first-option-example.html
This shows the hidden and ngIf do not perserve spacing, while the conditional class will.

Consider a UI that has a custom component - for now assume its just text.

The BOOMR.plugins.Angular plugin seems to be used for AngularJS 1.x and so far I failed to find a Angular example or plugin I could use. Based on the docs I came up with the following solution:

Controller.js

I am new to Django and API creation. I am trying to figure out if it is better to use djangorestframework or just use JsonResponse. I got the suggestion of djangorestframework from Digital Ocean's tutorial but also found out about JsonResponse, which seems simpler given that I don't have to install another package.

Goal: I would like to be able to provide user information for both web and mobile applications.

I see that there are some reasons provided on this post for djangorestframework, which I pasted below for posteriority.

The common cases for using DRF are:

1)You're creating a public-facing external API for third-party developers to access the data in your site, and you want to output JSON they can use in their apps rather than HTML.

2)You're doing mobile development and you want your mobile app to make GET/PUT/POST requests to a Django backend, and then have your backend output data (usually as JSON) to the mobile app. Since you don't want to pass back HTML to the mobile app, you use DRF to effectively create a REST API that your mobile app can call.

3)You're creating a web app, but you don't want to use the Django templating language. Instead you want to use the Django ORM but output everything as JSON and have your frontend created by a JavaScript MVC framework such as React, Backbone, AngularJS, etc. In those cases, you can use DRF to output JSON that the JavaScript framework can process.

I hope you guys are doing good in this pandemic time and spare some time to help me out.

I am trying to filter the data based on the drop-down selections of a drop-down list. Here I will get the data from the JSON input.

Here in the Filing Date, I have selected 06/30/2022 so for this date the below region offices are available.

So if I change the date to any another date like 07/30/2022 it is showing only 2 region offices

And if we expand the + icon it should display the values like below. That is the requirement and I am done with writing the code for expanding collapse functionality.

However, I am not sure how I need to bind the data associated with the date and display below. Here is the code I have written