Angular two-way binding for select with object

Question

Actually, i'm trying to bind the array of object to select input. I'm trying in this way, [(ngModel)]="users[i].roles", where 'users' is outer array and 'roles' is another array inside users. Here, roles is array of key value pairs like,

roles = [{'code': 1, 'desc: ''},{'code': 2, 'desc: ''},{'code': 3, 'desc: ''}]

How can i bind the 'code' from this array.

My HTML code,

 <mat-select placeholder="User Roles" [(ngModel)]="users[i].roles" matTooltip="{{users[i].roles}}" multiple>
    <mat-option *ngFor="let role of userRoles" [value]="role.code">{{role.desc}}</mat-option>
 </mat-select>

Do you have *ngFor to loop through users? Could you provide code — Dmitriy Snitko, Sep 12 '18 at 05:50

Ganesh · Answer 1 · 2018-09-14T04:36:32.903

2

try to use *ngFor inside a <div> element

<div *ngFor="let role of roles">
    <input type="number" [(ngModel)]="role.code">
</div>

for more details look here.. How properly bind an array with ngModel in angular 4?

edited Sep 14 '18 at 04:36

answered Sep 12 '18 at 05:24

Ganesh

5,808
2
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41

You have no need use index in template. [(ngModel)]="role.code" – Dmitriy Snitko Sep 12 '18 at 05:43

score 0 · Answer 2 · answered Sep 12 '18 at 05:20

0

put it in an ngFor :

in .ts :

roles= [{'code': 1, 'desc: ''},{'code': 2, 'desc: ''},{'code': 3, 'desc: ''}]

in .html

<div *ngFor="let role of roles;let index=index">
    <input [(ngModel)]="roles[index].code">
</div>

answered Sep 12 '18 at 05:20

SoroushNeshat

656
5
11

score 0 · Accepted Answer · answered Sep 12 '18 at 07:01

thanks for your help. I solved this problem by modifying code in this way...

for (let user of this.users) {
   user.userRoles = [];
   for(let role of user.roles)
   {
     user.userRoles.push(role.code);
   }
}

In html,

<mat-select placeholder="User Roles" [(ngModel)]="users[i].userRoles" matTooltip="{{users[i].userRoles}}" multiple>
    <mat-option *ngFor="let role of userRoles" [value]="role.code">{{role.desc}}</mat-option>
</mat-select>

Angular two-way binding for select with object

3 Answers3