CODEWITHSUNDEEP
angular
LearnToday
LearnToday

Reputation: 2902

How to check is checkbox is checked angular2

I want to check is checkbox is checked or unchecked in an if and else statement.

<md-checkbox id="mon" (change)="mon($event)" [checked]="true">Checked</md-checkbox>



mon(e){
    if(e.target.checked){
      console.log("This is checked")
    } else {
      console.log("unchecked");
    }
  }

I think I am doing it really wrong. I keep getting can't get checked of undefined. How is the way to do this?

Upvotes: 4

Views: 23574

Answers (2)

Amit kumar
Amit kumar

Reputation: 6147

declare a variable called it filter

filter: boolean= false;

then use ngModel in html part to access and assign its value.

<input type="checkbox" [(ngModel)]="filter" (click)="filterData()">

it will call a function filterData() which you can use to do all your functionality

filter(){
  this.filter = !this.filter;// this will change value of it true and false 
}

for more checkbox you can use declare more variable like filter1: boolean

Upvotes: 6

yurzui
yurzui

Reputation: 214295

We can look at source code of material checkbox:

event.source = this;
event.checked = this.checked;

this._controlValueAccessorChangeFn(this.checked);
this.change.emit(event);

https://github.com/angular/material2/blob/2.0.0-alpha.11/src/lib/checkbox/checkbox.ts#L288-L292

So you can do it like:

mon(e){
  if(e.checked){
    console.log("This is checked")
  } else {
    console.log("unchecked");
  }
}

Upvotes: 5

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