如何限制下拉列表使用角度仅选择一个值？

Question

I have dropdown in which options are coming from array using ng-repeat. It is working as normal drop-down. But I want in a different way. If one option is selected, it should be disabled in the other dropdowns. can we do like that in angular?

<div ng-app="myApp" ng-controller="MyCtrl">
    <div ng-repeat="address in addresses">
        Billing State:
        <select
            ng-model="address.state"
            ng-options="state.lookupCode as state.description for state in lov_state"></select>
        <tt>State selected: {{address.state}}</tt>
    </div>

</div>

controller code:

var myApp = angular.module('myApp', []);

myApp.controller('MyCtrl', function($scope) {

    $scope.addresses = [
        {'state': 'AL'},
        {'state': 'CA'},
        {'state': 'FL'}
    ];

    $scope.lov_state = [
        {'lookupCode': 'AL', 'description': 'Alabama'},
        {'lookupCode': 'FL', 'description': 'Florida'},
        {'lookupCode': 'CA', 'description': 'California'},
        {'lookupCode': 'DE', 'description': 'Delaware'}
    ];
});

Please help me to do that. Here is the jsfiddle link.

https://jsfiddle.net/santhosh1a32/3vd7hyrq/

Answer 1

You could use disable option provided in ng-options it self by using disable when condition in a place before for keyword.

<div ng-repeat="address in addresses">
  Billing State:
  <select ng-model="address.state" ng-change="checkSelected(address.state)" 
    ng-options="state.lookupCode as state.description disable when (address.state != state.lookupCode && state.selected) for state in lov_state">
  </select>
  <tt>State selected: {{address.state}}</tt>
</div>

Demo Here