Andreas Plahn Blog

Angular Bootstrap

Angular widgets built from the ground up using only Bootstrap 4 CSS with APIs designed for the Angular ecosystem.
No dependencies on 3rd party JavaScript.
ng-bootstrap.github.io/#/home

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/

jasmine parameterized unit test – Stack Overflow

Based on piotrek’s answer and the article Parameterized testing in Javascript, you could also use the following approach which uses ES6 syntax:
[ 
['abc', 3], 
['ab', 2], 
['', 0],
].forEach(([string, expectedLength]) => { 
it(`should return length ${expectedLength} for string "${string}"`, 
() => { expect(string.length).toBe(expectedLength); });
});
I have tested it with the Jest test framework, but it should work with Jasmine as well.

Source: jasmine parameterized unit test – Stack Overflow

keyboard shortcuts – Locate current file in IntelliJ/WebStorm – Stack Overflow

Select current file in project view
The current version of IntelliJ has renamed this to “Select In” under the Navigate category. The default shortcut is still ALT-F1

Source: keyboard shortcuts – Locate current file in IntelliJ – Stack Overflow