Checkbox angular material checked by default

Question

I am trying to use an Angular Material checkbox  and set it by default as checked  but it is displayed as non-checked  what is wrong    lt mat-checkbox class    example-margin    ngModel     obj impresora gt         lt label gt Printer lt  label gt    lt  mat-checkbox gt    obj impresora property is boolean

User · Answer

Set this in HTML        lt div class  modal-body    formGroup   Form  gt           lt div class    gt               lt mat-checkbox formControlName  a   disabled   true  gt  Display 1 lt  mat-checkbox gt           lt  div gt           lt div class    gt               lt mat-checkbox formControlName  b    disabled   true  gt   Display 2  lt  mat-checkbox gt           lt  div gt           lt div class    gt               lt mat-checkbox formControlName  c    disabled   true  gt   Display 3  lt  mat-checkbox gt           lt  div gt           lt div class    gt               lt mat-checkbox formControlName  d    disabled   true  gt   Display 4 lt  mat-checkbox gt           lt  div gt           lt div class    gt               lt mat-checkbox formControlName  e    disabled   true  gt  Display 5  lt  mat-checkbox gt           lt  div gt       lt  div gt    Changes in Ts file  this Form   this formBuilder group   a  false  b  false  c  false  d  false  e  false        Conditionvalidation in Ur Business logic  if true   this Form patch a  true

User · Answer

If you are using Reactive form you can set it to default like this   In the form model  set the value to false  So if it s checked its value will be true else false   let form   this formBuilder group       is known   false         In HTML    lt mat-checkbox matInput formControlName  is known  gt Known lt  mat-checkbox gt

User · Answer

You need to make sure the checked property to be true inside the component ts  export class CheckboxComponent implements OnInit    checked   true

User · Answer

For check it with ngModel  make a merge between  ngModel  and  value   Example     lt mat-checkbox   ngModel    myVariable   value  1   gt Subscribe lt  mat-checkbox gt    Where  myVariable   1  Greeting

User · Answer

in component ts checked  boolean   true  indeterminate boolean   false  disabled boolean   false  label string   onCheck         this label   this checked  ON   OFF         in component html enter code here   lt mat-checkbox class  example-margin   color   primary    ngModel    checked    indeterminate    indeterminate   labelPosition   after   disabled   disabled   change   onCheck    gt                        label                      lt  mat-checkbox gt    The above code should work fine   Mat checkbox allows you to make it checked unchecked  disabled  set indeterminate state  do some operation onChange of the state etc   Refer API for more details

User · Answer

this works for me in Angular 7     in component ts checked  boolean   true   changeValue value        this checked    value        in component html  lt mat-checkbox value  checked   click   changeValue checked   color  primary  gt     some Label  lt  mat-checkbox gt    I hope help someone     greetings  let me know if someone have some easiest

User · Answer

There are several ways you can achieve this based on the approach you take  For reactive approach  you can pass the default value to the constructor of the FormControl import from  angular forms   this randomForm   new FormGroup          amateur   new FormControl false         Instead of true or false value  yes you can send variable name as well like FormControl this booleanVariable   In template driven approach you can use 1 way binding  ngModel   this booleanVariable   or 2 way binding   ngModel    this booleanVariable  like this   lt mat-checkbox      name  controlName         ngModel    booleanVariable  gt         col title    lt  mat-checkbox gt    You can also use the checked directive provided by angular material and bind in similar manner

User · Answer

The chosen answer does work however I wanted to make a comment that having  ngModel  on the html tag causes the checkbox checked to not be set to true    This occurs when you are trying to do bind using the checked property  i e     lt mat-checkbox  checked   var  ngModel name  some name  gt  lt  mat-checkbox gt    And then inside your app component ts file  var   true    will not work   TLDR  Remove ngModel if you are setting the checked through the  checked  property       lt mat-checkbox  checked   var  name  some name  gt  lt  mat-checkbox gt

User · Answer

Make sure you have this code on you component   export class Component     checked   true

User · Answer

You can use    lt mat-checkbox  attr checked     myCondition    checked    null  gt   if the checked attribute is set to null  it gets removed from the html tag  or you can use Vega s anwser which should work too  mine is a completion that can be usefull if you don t want to link it with ngModel

User · Answer

You can either set with ngModel either with  checked  attribute   ngModel binded property should be set to  true    1      lt mat-checkbox class    example-margin    ngModel      myModel  gt        lt label gt Printer  lt  label gt      lt  mat-checkbox gt    2    lt mat-checkbox  checked    myModel  class    example-margin   gt        lt label gt Printer  lt  label gt    lt  mat-checkbox gt    3    lt mat-checkbox  ngModel   myModel  class  example-margin  gt       lt label gt Printer  lt  label gt    lt  mat-checkbox gt    DEMO

[angular] Checkbox angular material checked by default

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