ngEurope 2016. brief review

Several days ago I had a chance to visit ngEurope conference. It was 2 nice intensive days filled with presentations. If by some reason you were not there and don’t have time to watch all 16 hours I made some notes for you.

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Angular + ES6 Promise

It would be really nice if we could use native ECMAScript 2015 Promises with Angular instead of $q service that is provided from box to be close to pure JavaScript:

[javascript]
//somewhere inside component controller
let promise = new Promise((resolve) => setTimeout(() => resolve(‘resolved’), 2000));
promise.then(x => this.x = x);
[/javascript]

But in this case we will have to run digest manually for each resolve(to synchronise view and model):

[javascript]
let promise = new Promise((resolve) => setTimeout(() => resolve(‘resolved’), 2000));
promise.then(x => {
$scope.apply();
this.x = x;
});
[/javascript]

But what if we hack the Promise and intercept our digest call there:

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ui-router: Deprecated events and hooks

If you are using latest version of ui-router (now it’s 1.0.0-alpha) you probably already noticed that there are no events that we all got used to: $stateChangeCancel,  $stateChangeError, $stateChangeStart$stateChangeSuccess$stateNotFound. All of them are deprecated in 1.0.0-alpha.3 and you can not use them anymore in 1.0.0-alpha.5.

If you want to move to new version of ui-router you should make such changes:

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ui-router: Default child for abstract state

In version 1.0.0alpha0 they finally make it possible! Child for abstract states? No! But now at least it’s possible to create own fix for it due to new $transitionsProvider, in which you could define onBefore hook. You can change the behaviour depends on state options. Let’s use “abstract” property that is boolean and extend it: to make it possible to add child state here:

[javascript]
$transitionsProvider.onBefore({
to: state => !!state.abstract
}, ($transition$, $state) => {
if (angular.isString($transition.to().abstract)) {
return $state.target($transition.to().abstract);
}
});
[/javascript]

basically if abstract param is a string we set it like a target. Example of use:

[javascript]
.state({
name: ‘abstract2’,
url: ‘/abstract2’,
abstract: ‘abstract2.foo’, // redirect to ‘abstract2.foo’
template: ‘abstract2’
})
[/javascript]

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