问题
Trying to check/uncheck all children checkboxes using ngModel and all checkboxes are checked, but also trying to check alone children and all checkboxes are always checked;
<div>
<input type="checkbox" [checked]="myVar1" (change)="myVar1 = !myVar1" /> Parent
</div>
<ul>
<input type="checkbox" [(ngModel)]="myVar1" /> Child1<br>
<input type="checkbox" [(ngModel)]="myVar1" /> Child2
</ul>
Tried using [ngModelOptions]="{standalone: true}" property and it results with the same behaviour - all checkboxes are checked;
<div>
<input type="checkbox" [checked]="myVar2" (change)="myVar2 = !myVar2" /> Parent
</div>
<ul>
<input type="checkbox" [(ngModel)]="myVar2" [ngModelOptions]="{standalone: true}" /> Child1<br>
<input type="checkbox" [(ngModel)]="myVar2" [ngModelOptions]="{standalone: true}" /> Child2
</ul>
How to make every child checkbox standalone? stackblitz
回答1:
You are using the same [(ngModel)]
for child and parent which makes the child checked as soon as parent is checked.
You need to have different [(ngModel)]
for children and use a checked/changed function on parent checkbox to do the check all child i.e set child ngModel
to true
or false
.
EX:
<div>
<input type="checkbox" [checked]="myVar1" (change)="updateChildSelection($event)" /> Parent
</div>
<ul>
<input type="checkbox" [(ngModel)]="myVarChild1" /> Child1<br>
<input type="checkbox" [(ngModel)]="myVarChild2" /> Child2
</ul>
In component:
updateChildSelection(event) {
// set child to true if checked
if(event.target.checked){
this.myVarChild1 = true;
this.myVarChild2 = true
} else {
//set child model to false
}
}
来源:https://stackoverflow.com/questions/56137453/angular-ngmodel-checks-all-checkboxes