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Im trying to do a custom validation on Angular 5 but I'm facing the following error  Expected validator to return Promise or Observable   I just want to return an error to the form if the value doesnt match the required, heres my code:  This is t...
I am quite new to Angular 5 and have just started learning it. Recently, I have been trying to create a menu bar with multiple menus for my app using Angular 5 Material. The menu will be triggered/opened during mouse enter and closed when the mouse l...
I am working on to add jsplumb community js library version with the angular 5 application (Angular CLI: 1.6.1).   With the first build without any configuration to tsconfig.json I get the following error.  ERROR in src/app/jsplumb/jsplumb.component....
In my application If data is undefined or null which is coming from service, my html will not load and I will get "data is undefined" error so I am tring to use lodash, but dont know how to use it..  In my below ts file      this._PartService...
I am using Angular 5 and I have this:  // app.component.ts import { Component } from '@angular/core';  @Component({   selector: 'app-root',   templateUrl: './app.component.html',   styleUrls: ['./app.component.css'] })...
I am working on an Angular CLI Project where I need to call some jQuery functions.  I have included my js in the angular.json file:  "scripts": [     "node_modules/jquery/dist/jquery.min.js",     "src/custom.js" ]   jQuery fun...
Selection list becomes empty when datasource is updated.  steps: 1. select some users  steps: 2. select second tab  steps: 3. come back to the first tab  selected users are available in chips but not selected in datatable.  look at https://stackblitz...
While working with Angular CDK and developing a custom component, I am trying to implement stagger animation with ngIf and ngFor. The animation is a sequence of simple fade in.  The following simplified HTML:  <button (click)="visible = !visib...
I'm trying to make the service worker in angular work with API requests. I'd like the app to work offline and I've the below config:      {         "name": "api",         "urls": ["https://x.com/**"],...

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