CDK | Angular Material

The Component Dev Kit (CDK) is a set of tools that implement common interaction patterns whilst being unopinionated about their presentation. It represents an abstraction of the core functionalities found in the Angular Material library, without any styling specific to Material Design. Think of the CDK as a blank state of well-tested functionality upon which you can develop your own bespoke components.
material.angular.io/cdk/categories

3 Ways to Pass Async Data to Angular 2+ Child Components ― Scotch.io

Let’s start with a common use case. You have some data you get from external source (e.g. by calling API). You want to display it on screen.However, instead of displaying it on the same component, you would like to pass the data to a child component to display.The child component might has some logic to pre-process the data before showing on screen.
…
Solution 1: Use *ngIf
Solution 2: Use ngOnChanges
Solution 3: Use RxJs BehaviorSubject

Source: 3 Ways to Pass Async Data to Angular 2+ Child Components ― Scotch.io

Internet Explorer 11 and Angular 2+ – Agilix – Medium

IE 11 and Angular don’t always mix. I must say that there’s quite the support provided by the Angular dev team and community. But, there are things that really aren’t up for the Angular devs to fix.

I’ve created a small list of issues I’ve encountered when developing and Angular 5 application for an IE 11 client.

Source: Internet Explorer 11 and Angular 2+ – Agilix – Medium

Javascript debugging helper – Count number of eventlisteners in Chrome console

Paste and run one of the code blocks below in chrome console to get eventlisteners count.

//eventlisteners counter - grouped summary
Array.from(document.querySelectorAll('*'))  .reduce(function(pre, dom){
    var evtObj = getEventListeners(dom)
    Object.keys(evtObj).forEach(function (evt) {
      if (typeof pre[evt] === 'undefined') {
        pre[evt] = 0
      }
      pre[evt] += evtObj[evt].length
    })
    return pre
  }, {})
  
//_-------------------------------------------
  
  // //eventlisteners - totalcount
  var totalCount = 0;
  Array.from(document.querySelectorAll('*')).reduce(function(pre, dom){
    var evtObj = getEventListeners(dom)
    Object.keys(evtObj).forEach(function (evt) {
      if (typeof pre[evt] === 'undefined') {
        pre[evt] = 0
      }
      // pre[evt] += evtObj[evt].length
	  totalCount += evtObj[evt].length;
    })
    return totalCount;
  }, {})
  
  
  //---------------------------------------

 

Angular: Tips. The importance of Pipes – codeburst

What we all like in Angular primarily is that it all mostly about templates. Templates are smart, dynamic, they use change detection to update themselves on a moment’s notice when a model is updated, the can manage HTML elements and nested components, enrich the markup with directives and make on-the fly data transformations, and the template syntax is amazing. The tools provided are vast and rich, but is it up to us to use them wisely.

Source: Angular: Tips. The importance of Pipes – codeburst

How to avoid website jank: a lot of performance tips

We see more and more websites that do not care of the performances.
They are slow, fat, embed lots of resources, make you download several MBs, are not fluid when you scroll down, are not fluid when you click on something, are not responsive, have slow animations. It’s easy to make a website, but it’s harder to make it good. A slow website will have a big churn in its users, because the navigation was crappy.
www.sderosiaux.com/articles/2015/03/01/perfmatters/