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AngularJS

Sain tehtäväksi tehdä käyttöliittymän tabletille. Valitsimme toteutukseksi AngularJS kirjaston. Se on saanut ristiriitaisen arvion, ainakin mikäli lukee keskustelupalstoja.[1] Tilastojen mukaan sen käyttö on kuitenkin lisääntynyt tasaisesti. [2]

Vaikka olin tehnyt pienempiä kokeiluja Angularilla jo ennenkin, ensimmäisenä lähdin etsimään hyvää guideline miten Angularilla tehdään hyvää koodia. Yksi suositumpia guidelineja on John Papan, josta löytyy jopa oma kurssi Pluralsightista. Päätin ottaa sen käyttöön. Huomioitavaa siinä on mm. controllerAs tyylin käyttäminen sekä kaiken ylimääräisen (mm. taustapalvelukutsujen) siirtäminen pois controllereista.

Käytin myös jonkin verran directivejä. Directiveillä voi tehdä DOM puusta helpommin luettavaa semanttisessa mielessä. Huomioita piti kiinnittää siihen, että nämä toimivat kontekstista riippumatta jos käyttää useita templateja.

AngularJS sanotaan myös verrattain hitaaksi johtuen clienttipuolen HTML templatejen parsimisesta ja digest syklistä. Se varmaan pitääkin paikkansa johonkin toiseen frameworkiin verrattuna (ReactJS?). Toisaalta se että siitä tulisi merkityksellistä vaatii melko suositun ja monipuolisen webbiapplikaation. Varmasti joillakin vanhemmilla puhelimilla tai tableteilla voi olla joitakin ongelmia mutta vaikeaa nähdä todellista ongelmaa itse frameworkissa. Itse en ainakaan muutaman vuoden vanhalla tabletilla havainnut mitään ongelmia tämän suhteen.

Keskusteluissa usein puhutaan uudesta 2.0 versiosta. Ihmetystä on joissakin herättänyt se miten suuria muutoksia frameworkiin on tulossa. Mielestäni major version ei pidäkään olla taaksepäin yhteensopiva. Otan vastaan mielenkiinnolla perustavaa laatua olevat muutokset kuten controllereiden poistaminen ja komponentit

Edit 23.9

Hyvä postaus AngularJS ongelmista http://www.leanpanda.com/blog/2015/09/20/our-criticisms-of-angularjs/

[1] https://www.reddit.com/r/webdev/comments/2qvi6a/eli5_what_is_the_controversy_around_angularjs_and/
[2] http://w3techs.com/technologies/details/js-angularjs/all/all

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