javascript - How to validate if there is at least one checkbox selected out of 3 checkboxes in angularjs -

ok code:

<input name="chkbx1" type="checkbox"     ng-model="loanreferdata.prop1"     ng-class="submitted?'ng-dirty':''" required>prop 1</input>  <input name="chkbx2" type="checkbox"     ng-model="loanreferdata.prop2" ng-class="submitted?'ng-dirty':''"     required>prop 2</input>  <input name="chkbx3" type="checkbox" ng-model="loanreferdata.prop3"     ng-class="submitted?'ng-dirty':''" required>other</input>   <span class="error" ng-show="((frmloanrefer.chkbx1.$dirty || submitted) && frmloanrefer.chkbx1.$error.required) ||                                                              ((frmloanrefer.chkbx2.$dirty || submitted) && frmloanrefer.chkbx2.$error.required) ||                                                              ((frmloanrefer.chkbx3.$dirty || submitted) && frmloanrefer.chkbx3.$error.required)  ">                             * please select atleast 1 property required.</span> 

you can add 'ng-true-value' attribute in inputs example

<input name="chkbx1" type="checkbox" ng-true-value="true"                             ng-model="loanreferdata.prop1"                             ng-class="submitted?'ng-dirty':''" required>prop 1</input>  <input name="chkbx2" type="checkbox" ng-true-value="true"                             ng-model="loanreferdata.prop2" ng-class="submitted?'ng-dirty':''"                             required>prop 2</input>  <input name="chkbx3" type="checkbox" ng-model="loanreferdata.prop3" ng-true-value="true"                             ng-class="submitted?'ng-dirty':''" required>other</input>  {{loanreferdata}} 

and here answer

{"prop1":"true","prop2":"true","prop3":false}