How to validate that at least one checkbox should be selected?

Question

I want to do validation for checkboxes here without form tag. At least one checkbox should be selected.

Answer 1

On validation (i.e for example some click event) iterate over your array and check whether at least one item is true.

let isSelected: any = this.officeLIST.filter((item) => item.checked === true);
if(isSelected != null && isSelected.length > 0) {
 //At least one is selected
}else {
 alert("select at least one");
}