CODEWITHSUNDEEP
angularionic3
Verthon
Verthon

Reputation: 3247

Ionic 3 How to select specific ion-chip on click event?

I have bunch of ion-chips generated by ngFor loop. I have added select all ion-chips functionality using tagDefaultColor variable. Right now when I want to select single ion-chip it selects all of them.

What I'm trying to achieve is being able to use toggle all button to select every ion-chip or select them one by one with click event. Once ion-chip is selected it changes its color to primary. Thank you in advance.

constructor(public navCtrl: NavController, public navParams: NavParams) {
    this.information = navParams.data.data;
    this.children = [{ id: 1, name: 'Ginny Weasley' }, { id: 2, name: 'Harry Potter' }, { id: 3, name: 'Ronald Weasley' }, { id: 4, name: 'Luna Lovegood' }];
    this.selectButtonText = 'SELECT ALL';
    //this.tagSelectedColor = "primary";
    this.tagDefaultColor = "secondary";
    this.quantity = 0.0;
    this.shareWithFamily = true;
  }

selectAll() {
    if (this.selectButtonText === 'SELECT ALL') {
      this.selectButtonText = 'UNSELECT ALL'
      this.tagDefaultColor = "primary";
    } else {
      this.selectButtonText = 'SELECT ALL'
      this.tagDefaultColor = "secondary"
    }
  }

changeTagColor(event) {
    console.log(event.target);
    if (this.tagDefaultColor === "secondary") {
      this.tagDefaultColor = "primary"
    } else {
      this.tagDefaultColor = "secondary"
      event.target.setAttribute('color', 'secondary')
    }
  }

HTML part

<ion-item no-lines>
      <ion-row>
        <ion-col style="display: flex;align-items: center; justify-content: center">
          <strong>Tag Students</strong>
          <button ion-button full color="primary" class="select-all-btn" (click)="selectAll()">{{selectButtonText}}
          </button>
        </ion-col>
      </ion-row>
    </ion-item>

    <div class="students-tags">
      <ion-chip [id]="child.id" [color]="tagDefaultColor" (click)="changeTagColor($event)" *ngFor="let child of children">
        <ion-label>{{child. name}}</ion-label>
      </ion-chip>
    </div>

Upvotes: 5

Views: 3806

Answers (1)

Eldar
Eldar

Reputation: 10790

All your chips bind to same property so if you change that they will all change. Instead you should use array to assign them individually like below :

<ion-chip [id]="child.id" [color]="tagDefaultColor[i]" (click)="changeTagColor(i)" *ngFor="let child of children;let i = index">
        <ion-label>{{child. name}}</ion-label>
      </ion-chip>

changeTagColor(i:number) {
    console.log(event.target);
    if (this.tagDefaultColor[i] === "secondary") {
      this.tagDefaultColor[i] = "primary"
    } else {
      this.tagDefaultColor[i] = "secondary"
      // event.target.setAttribute('color', 'secondary') this is redundant
    }
  }

Edit: Since ionic doesn't export a component sadly you cant use template ref to change color directly with component.

And as you asked in comments there is an easy way to populate colors array like below :

  tagDefaultColor = Array(this.children.length).fill("secondary");

Here is the Stackblitz sample.

Upvotes: 5

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