Change ion-col breakpoint in *ngFor - ionic-framework

Question

Hello i want to change the ion-col breakpoint and width while i display rows from my db.
I want rows with item.type= 'B' to be col-12 but rows with item.type A,C,D to be col-6. Any idea?
<ion-grid>
<ion-row>
<ion-col col-6 *ngFor="let item of items;" >
<ion-card>
<ion-card-content>
<div *ngIf="item.type==='A'">
some data
</div>
<div *ngIf="item.type==='B'">
some data 2
</div>
<div *ngIf="item.type==='C'">
some data 3
</div>
<div *ngIf="item.type==='D'">
some data 4
</div>
</ion-card-content>
</ion-card>
</ion-col>
</ion-row>
</ion-grid>

Answer 1

you can achieve this using size attribute in ionic 4.
<ion-col *ngFor="let item of items;" [size]="item.type == 'B' ? 12 : 6 ">
<ion-card>
<ion-card-content>
<div *ngIf="item.type==='A'">
some data
</div>
<div *ngIf="item.type==='B'">
some data 2
</div>
<div *ngIf="item.type==='C'">
some data 3
</div>
<div *ngIf="item.type==='D'">
some data 4
</div>
</ion-card-content>
</ion-card>
</ion-col>
refrence https://ionicframework.com/docs/layout/grid#all-breakpoints
for ionic 3 you can use this code
<ion-grid>
<ion-row *ngFor="let item of items;">
<ng-container *ngIf="item.type == 'B'">
<ion-col col-12 >
<ion-card>
<ion-card-content>
<div *ngIf="item.type==='A'">
some data
</div>
<div *ngIf="item.type==='B'">
some data 2
</div>
<div *ngIf="item.type==='C'">
some data 3
</div>
<div *ngIf="item.type==='D'">
some data 4
</div>
</ion-card-content>
</ion-card>
</ion-col>
</ng-container>
<ng-container *ngIf="item.type != 'B'">
<ion-col col-6 >
<ion-card>
<ion-card-content>
<div *ngIf="item.type==='A'">
some data
</div>
<div *ngIf="item.type==='B'">
some data 2
</div>
<div *ngIf="item.type==='C'">
some data 3
</div>
<div *ngIf="item.type==='D'">
some data 4
</div>
</ion-card-content>
</ion-card>
</ion-col>
</ng-container>
</ion-row>
</ion-grid>

Answer 2

You can use this technique:
https://angular.io/api/common/NgIf
If you read through you will see something called the else block:
<div class="hero-list" *ngIf="heroes else loading">
...
</div>
<ng-template #loading>
<div>Loading...</div>
</ng-template>
So in your case it would be
<div *ngIf="item.type=='B' else sixRow">
...
</div>
<ng-template #sixRow>
...
</ng-template>