Troubleshooting: ng-If directive malfunctioning in an Ionic Cordova project with Angular

Project details: Using Ionic Cordova Version of Ionic: 7 Angular version: 18.0.3

The *ngIf directive is not functioning as expected.

page.html

<ion-segment [(ngModel)]="segment" (ionChange)="typeChange($event)">
    <ion-segment-button value="right">
        <ion-label>Right</ion-label>
    </ion-segment-button>
    <ion-segment-button value="missing">
        <ion-label>Missing</ion-label>
    </ion-segment-button>
    <ion-segment-button value="damaged">
        <ion-label>Damaged</ion-label>
    </ion-segment-button>
</ion-segment>

<div *ngIf="segment == 'right'">
    Right
  </div>

  <div *ngIf="segment == 'missing'">
    Missing
  </div>

  <div *ngIf="segment == 'damaged'">
    Damaged
  </div>

page.ts:


segment = "right";

typeChange(event) {
    console.log(this.segment);
}

Above represents my code snippet.

Expected result image link

Actual output image link Seeking assistance in resolving the issue.

Thank you for your help!

angulartypescriptcordovaionic-frameworkangular-ng-if

Answer №1

Make sure to implement the following code snippet inside your page.ts:

segment: string = 'right';  // Setting default value to 'right'
    
    typeChange(event: any) {
        this.segment = event.detail.value;  // Updating segment value on change
        console.log(this.segment);  // Useful for debugging purposes
    }

Remember to utilize the strict equality operator (===) in place of ==.

<ion-segment [(ngModel)]="segment" (ionChange)="typeChange($event)">
  <ion-segment-button value="right">
    <ion-label>Right</ion-label>
  </ion-segment-button>
  <ion-segment-button value="missing">
    <ion-label>Missing</ion-label>
  </ion-segment-button>
  <ion-segment-button value="damaged">
    <ion-label>Damaged</ion-label>
  </ion-segment-button>
</ion-segment>

<div *ngIf="segment === 'right'">
  Right
</div>

<div *ngIf="segment === 'missing'">
  Missing
</div>

<div *ngIf="segment === 'damaged'">
  Damaged
</div>

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