单击时如何仅更改离子列表中的一种离子项目颜色？

Question

I have tried multiple things but I can't seem to figure this one out. I have an ion-list with multiple ion-items that I get from an array with the help of * ngFor . When I click on one item, I only want its' color to be changed. I've managed to be able to change all the ion-item colors when I click one of them but that's not what I want.

This is a code snippet:

      <ion-col>
         <ion-item *ngFor="let exercise of exercisesArray" (click)="onClick(exercise)"  [ngStyle]="{color: color}"> 
          {{exercise.title}}
        </ion-item>
      </ion-col>
    </ion-list>

As you can see, I tried changing the color variable when clicking in the function onClick(exercise). I need the exercise as a parameter for other purposes. Anyways, that works but all the items in the exerciseArray get that color. But as I said, I would like to only change the color of the item that has been clicked.

Thank you in advance for your help!

Answer 1

In order to do that, create the exercisesArray like this for example -

exercisesArray = [
    {
      title: "A",
      color: "green"
    },
    {
      title: "B",
      color: "green"
    },
    {
      title: "C",
      color: "green"
    }
  ];

and in onclick function, send the id of the array that has been clicked and based on that id, change the color of that object. for example,

this.exercisesArray[index].color = 'red';

For further reference, take a look at this

Answer 2

Take a Variable and check index of your *ngFor if item gets clicked change color.

.ts

selectedItem: any;

.html

<ion-item *ngFor="let exercise of exercisesArray; let i = index" (click)="onClick(exercise); selectedItem = i"  [ngStyle]="{color: selectedItem == i ? YourNewColor : null}">
{{exercise.title}}
</ion-item>

update you selectedItem variable when Item gets clicked and check it in your ngStyle to apply new Color.