CODEWITHSUNDEEP
htmlangular
bshah
bshah

Reputation: 49

Setting the div in angular to different color on click

So though my question might sound familiar the case is a bit different. I have a screen with multiple tasks. To show the tasks I am iterating via the data and my code looks something like 

  

  <div *ngFor="let task of tasks" class="scheduleContainer inline-block shadow">
      <div id="myHeader" #myHeader class="activeHeader">
        {{task.title}}
      </div>
      <div class="detailsBox">
        <div class="row">
          <div class="offset-md-1 col-md-auto">
            Last Date:
          </div>
          <div class="col-md-auto">
            {{task.lastDate}}
          </div>
        </div>
        <div class="row">
          <div class="offset-md-1 col-md-auto">
            Duration:
          </div>
          <div class="col-md-auto">
            {{task.duration}}
          </div>
        </div>
        <div class="row">
          <div class="offset-md-1 col-md-auto">
            Total Runs:
          </div>
          <div class="col-md-auto">
            {{task.totalRun}}
          </div>
        </div>
      </div>
      <div class="footer">
        <a [routerLink]="['edit-scheduled-tasks']">edit schedule</a> &nbsp;
        <a [routerLink]="['view-history-scheduled-tasks']">view history</a> &nbsp;
        <a (click)="onClick()">enable task</a> &nbsp;
        <a href="" *ngIf="flag==task.isRunNow">run now</a>
      </div>
    </div>

    <router-outlet></router-outlet>

Now when I click on the enabled task, I would like the color of that particular div to be changed. In my component, I tried something like 

   onClick() {
        this.myHeader.nativeElement.style.background = 'red';
      }

So this did change the color but it did not change the current task but rather some other task. Suggestions?

Upvotes: 1

Views: 3409

Answers (3)

Muhammed Albarmavi
Muhammed Albarmavi

Reputation: 24472

you can access myHeader from template so you can change the color something like this 

  <div id="myHeader" #myHeader class="activeHeader">
        Change the color by myHeader variable
  </div>

  <button (click)="myHeader.style.background='red'">click</button>

or you can use a property with ngStyle like this 

<div [ngStyle]="{'background-color':color}" >
          Another way by ngStyle
 </div>

 <button (click)="color='red'">click</button>

or you can use a property to toggle class with ngClass

<div [ngClass]="{'red':isClicked}" >
  Set class 
</div>

<button (click)="isClicked=!isClicked">Toggle class</button>

Example toggle color of taskList by useing ngClass

template 

<div *ngFor="let task of taskList" 
    [ngClass]="{'red':selectedTasks[task.id]}" 
    (click)="selectedTasks[task.id]= !selectedTasks[task.id]" class="task">
   {{task.name}}
</div>

or you can use button to toggle the state

<div *ngFor="let task of taskList" 
    [ngClass]="{'red':selectedTasks[task.id]}" 
     class="task">
   {{task.name}} 
   <button (click)="selectedTasks[task.id]= !selectedTasks[task.id]">toggle {{task.name}}</button>
</div>

if you want to set the state without toggle on click event just set the state to true like this selectedTasks[task.id] =true

component

  taskList =[
    {id:1 , name:'Task 01'},
    {id:2 , name:'Task 02'},
    {id:3 , name:'Task 03'},
    {id:4 , name:'Task 04'},
    {id:5 , name:'Task 05'},
  ];

  selectedTasks = {};

stackblitz demo

Upvotes: 2

Vikas
Vikas

Reputation: 12036

It's not a good practice to manipulate DOM directly.
Angular: Stop manipulating DOM with ElementRef!

As an alternate, It's easy to bind inline style in your Angular templates using style binding.

Since you would like the color of that particular div to be changed. Use A boolean array:

component:

 export class AppComponent  {
  name = 'Angular';
  public styleArray=new Array<boolean>(10);

  onClick(i)
  {
    this.styleArray[i]=true;
  }
}

While Iterating pass index to onClick(i) to set particular index of array true and apply style dynamically

[style.color]="styleArray[i] ? 'green':'black'"  



  <div *ngFor="let task of tasks; let i=index" class="scheduleContainer inline-block shadow">
          <div id="myHeader" [style.color]="styleArray[i] ? 'green':'black'"  class="activeHeader">
            {{task.title}}
          </div>
........rest of the code
 <a (click)="onClick(i)">enable task</a> &nbsp;

Live Demo

Upvotes: 0

Amit Chigadani
Amit Chigadani

Reputation: 29795

Not a clean way to do, but it still works. Send an index of selected element to onClick(i) and add the color to selected div. So that you don't mess with template reference.

html

<div *ngFor="let task of tasks; let i=index;" class="scheduleContainer inline-block shadow">
    <div id="myHeader" #myHeader class="activeHeader">
        {{task}}
    </div>
    <div class="footer">
        <a (click)="onClick(i)">enable task</a> &nbsp;
    </div>
</div>

component.ts

 onClick(index: number) {
     document.querySelectorAll('#myHeader')[index]
      .style.background = 'red';
  }

DEMO

Upvotes: 0

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