How to change an element’s CSS class and remove all other classes on click

Question

How do I handle a case in AngularJS 2 where on click of an element it needs to change its own style, and if other elements have that style they need to have it removed — prefera

Answer 1

Html code


    
Log In
    
    
      
        
      
        
      SIGN IN

    
    

      Forgot Password?
    
  

css code

.first-div{
    width: 350px;
    border: 2px solid black;
    margin-left: auto;
    margin-right: auto;
    margin-top: 130px;
    border-radius: 5px;
    height: 400px;
    background-color: black;
    color: white;

}
.heading{
    color: white;
    text-align: center;
    font-weight: 500;
    /* background-color: white; */   
}
.in-cl{
    margin: 20px 20px 0px 20px;
    border: 2px solid white;
    border-radius: 15px;
    height: 40px;
    padding: 5px;
    width: 300px;
    outline: none;
    color: black;
    /* padding-right: 60px; */
}
::placeholder{
    color: black;
}
div button{
    background-color: #3aafa9;
    color:black;
    text-align: center;
    border: none;
}
.forgot{
    margin: 15px;
    text-align: center;
    font-weight: 550;
    color: white;
}

/* .image{
    position: absolute;
    left: 825px;
    top: 222px;
}
.lock-image{
    position: absolute;
    left: 825px;
    top: 282px;
} */
/* edited */
.fa-user:before{
    color: black;
}
.fa-lock:before{
    color: black;
} 
.fa-unlock:before{
    color: black;
}
.fa-edited{
    top: 228px;
    left: 770px;
    position: absolute;
    width: 28px;
}
.fa-lock-edited{
    top: 287px;
    left: 772px;
    position: absolute;
}
a{
    color: white;
}

ts code

import { Component, OnInit } from '@angular/core';
import { Router } from '@angular/router';
import swal from 'sweetalert2';
@Component({
  selector: 'app-login',
  templateUrl: './login.component.html',
  styleUrls: ['./login.component.css']
})
export class LoginComponent{
  username:string="pavithra";
  password:string="8792415337abcd";
  p = document.getElementById('mypassword');

  constructor(private router:Router) {}
  credential(username:string,password:string){

    if(this.username==username && this.password==password ){
      this.router.navigate(['/home'])
      swal.fire({title:'Signed in successfully', confirmButtonColor:'#3aafa9', type:'success'})
    }
    else{
      this.router.navigate(['/login'])
      swal.fire({title:'Invalid Username or Password',type:'warning',position:'top-end'})

    }
  }
  isPassword = true;
  onclick(){
    let body = document.getElementById('lock-id')
    if (body.classList) { 
      body.classList.toggle("fa-unlock");
      this.isPassword = !(this.isPassword);
    } else {
      var classes = body.className.split(" ");
      console.log(classes)
      var i = classes.indexOf("fa-lock");

      if (i >= 0) 
        classes.splice(i, 1);
      else 
        classes.push("fa-unlock");
        body.className = classes.join(" "); 
    }


  }




}