How to set values in a component model before opening a dialog through a service [Angular 4] -


i have subjectdialogcomponent child of subjectpopupcompoenet , both of them communicate via subjectpopupservice. want change model of subjectdialogcomponent before gets opened, specially have select components , want change model of select component based on conditions using subjectpopupservice. have now.

@component({     selector: 'subject-dialog',     templateurl: `<div class="form-group">          <label for="field_project">project</label>         <select class="form-control" id="field_project" name="project" [(ngmodel)]="subject.project" required>             <option [ngvalue]="null"></option>             <option [ngvalue]="projectoption.id === subject.project?.id ? subject.project : projectoption" *ngfor="let projectoption of projects; trackby: trackprojectbyid">{{projectoption.projectname}}</option>         </select>     </div>`' }) export class subjectdialogcomponent implements oninit {      subject: subject; // can changed      issaving: boolean;     projects: project[]; // want change values of projects      ngoninit() {         if(this.projects==null) {             this.projectservice.query().subscribe(             (res) => {                 this.projects = res.json();             });         }     }     // other methods }

my subjectpopupcompoenet follows. trying change model based on whether have subject, project specific request. 

@component({     selector: 'subject-popup',     template: '' }) export class subjectpopupcomponent implements oninit, ondestroy {      modalref: ngbmodalref;     routesub: any;      constructor(private route: activatedroute,                 private router : router,                 private subjectpopupservice: subjectpopupservice,     ) {     }      ngoninit() {         this.router.routerstate.root.firstchild.url.subscribe(url => {             if(url[0].path === 'project' && url[1].path) {                 this.routesub = this.route.params.subscribe((params) => {                     if (params['id']) {                         this.modalref = this.subjectpopupservice                         .open(subjectdialogcomponent, params['id'] , url[1].path);                     } else {                         this.modalref = this.subjectpopupservice                         .open(subjectdialogcomponent , null ,  url[1].path);                     }                 });             }             else {                 this.routesub = this.route.params.subscribe((params) => {                     if (params['id']) {                         this.modalref = this.subjectpopupservice                         .open(subjectdialogcomponent, params['id']);                     } else {                         this.modalref = this.subjectpopupservice                         .open(subjectdialogcomponent);                     }                 });             }         });      }      ngondestroy() {         this.routesub.unsubscribe();     } }

this relevant , confusing part. in service alter subject model , reflect correctly in ui. not projects. get loaded in ngoninit method. 

@injectable() export class subjectpopupservice {     private isopen = false;     constructor(         private modalservice: ngbmodal,         private router: router,         private subjectservice: subjectservice,         private projectservice: projectservice,      ) {}      open(component: component, id?: number | , projectid?: number | any): ngbmodalref {         if (this.isopen) {             return;         }         this.isopen = true;          if (id) {             this.subjectservice.find(id).subscribe((subject) => {                 this.subjectmodalref(component, subject , projectid);             });         } else {             var subject = new subject();             return this.subjectmodalref(component, subject, projectid);         }     }      subjectmodalref(component: component, subjects: subject , projectid?: number ): ngbmodalref {         const modalref = this.modalservice.open(component, { size: 'lg', backdrop: 'static'});         modalref.componentinstance.subject = subjects; // set subject         if(projectid) {             this.projectservice.find(projectid).subscribe((project) => {                 let projects = [project];                 modalref.componentinstance.projects = projects; // not set here in select component                 console.log('here',modalref.componentinstance.projects)             });         }         return modalref;     } }

so think when modelref.open instance created executes ngoninit, don't know how change in there or set value before open dialog.

can body advice me on how solve this? please kind of advice appreciated , thanking in advance.


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