angularjs - Angular 2 digest fails at executing a function, or finding a change at an object's property -


i have absolutely no idea on what's going on; 2 theories in title. thing is, should working, somehow 1 of core parts of angular, digest cycle, failing hard.

what want do, , how did it

a comments section instantiated in parent view, when click button. comments appear, , behave reddit's: can upvote or downvote them. pretty same! added arrows, , rating of comments between them:

<div class="rating">     <ion-row>     <button class="nocolor" (click)="ratecomment(comment, true)">     <ion-icon large name="arrow-up" [color]="israted(comment.rated, 1)"></ion-icon>     </button>     </ion-row>      <ion-row>      <span [style.margin-left]="pointsmargin(comment.rating)">{{comment.rating}}</span>     </ion-row>      <ion-row>        <button class="nocolor" (click)="ratecomment(comment, false)">     <ion-icon large name="arrow-down" [color]="israted(comment.rated, 2)"></ion-icon>        </button>     </ion-row> </div>

as can see, when click in icons, execute "ratecomment" function, is:

   ratecomment(comment, liked){      if (liked==true){        comment.rating++;        comment.rated=1;        //register      }else{        comment.rating--;        comment.rated=-1;        //register unlike      }    }

ok, pretty straightforward. object's property changed, should somehow change icon's color default gray-like color, more amber. works when data first represented: see voted comments proper arrow, proper colored. great. but if click in arrow, color doesn't change.

the function chooses color of icon, works @ start fails when updating view, one:

   israted(value, component){      if(component == 1 && value == 1){        return 'amber';      }else if(component == 2 && value == -1){        return 'amber';        }    }

basically, can see, upper arrow uses 1 component value , down arrow uses 2, reuse function.

so, what's problem?

as said, problem i'm having here, either "israted" function not being executed in digest's cycle, or change os ion-icon color not working, or property change of object not trigger view update. don't know what's going on; failing hard , can't find error in code.

edit: "israted" function executed, old value, if new 1 doens't registered in object. odd, since gets changed in "ratecomment" function.


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