Angular ng-options object linked to ng-repeat object

Question

I have a problem with angular, using ng-options on a select tag, where the default selected element should be determined by a property in "company" from the ng-repeat element. Look at this code:

<tr data-ng-repeat="company in companies">
   <td><input data-ng-model="company.Name" value="{{company.Name}}" /></td>
   <td>
     <select data-ng-model="selectedSeller" data-ng-options="seller.Login for seller in sellers">
     </select>
  </td>
</tr>

I can set a default element on all elements by $scope.selectedSeller = $scope.companies[0] in the controller scope, but what I really want, is to set selected to whoever is responsible for the company by linking the seller object to the company object. I need someway to implement "isSelected" from the code below.

<tr data-ng-repeat="company in companies">
   <td><input data-ng-model="company.Name" value="{{company.Name}}" /></td>
   <td>
     <select data-ng-model="selectedSeller" isSelected="company.responsible == seller.id" data-ng-options="seller.Login for seller in sellers">
     </select>
   </td>
</tr>

Anyone know how to solve this?

Answer 1

Use the filter as:

<select data-ng-model="selectedSeller" data-ng-options="seller.Login for seller in sellers" ng-init="selectedSeller = $filter('filter')($scope.company, {responsible: seller.id})[0]">
     </select>

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

app.controller('StackController', function($scope) {
    $scope.companies = [
        {
            name: 'company 1',
            responsible : 1
        },
        {
            name: 'company 2',
            responsible : 2
        },
        {
            name: 'company 3',
        }
    ];
    
    $scope.sellers = [
        {
            login : 'pavel',
            id : 1,
        },
        {
            login : 'petr',
            id : 2,
        },
        {
            login : 'igor',
            id : 3,
        }
    ];
}).filter("filterSeller", function() {
	return function(sellers, company) {
        var seller = {};
   
		angular.forEach(sellers, function(item, j) {
            if(company.responsible == item.id){
                seller = item;
                return false;
            }
        });
     
        return seller.id;
	};
});

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>

<table ng-app="stackApp" ng-controller="StackController">
    <tr ng-repeat="company in companies">
        <td><input ng-model="company.name"/></td>
        <td>
            <select ng-model="company.responsibleSelected" ng-options="seller.id as seller.login for seller in sellers" 
            ng-init="company.responsibleSelected = (sellers | filterSeller:company)">
            </select>
        </td>
      <td>{{company.responsibleSelected}}</td>
    </tr>
</table>

Answer 2

Angular is data driven, so you specify just model and ng-model connects it to the inputs.

So you provide just ng-model, no value and no "isSelected"

Look at this example: http://jsbin.com/kiqazaxahe/edit?html,js,output

<table>
  <tr ng-repeat="company in vm.companies">
   <td><input data-ng-model="company.
     name"/></td>
   <td>
     <select data-ng-model="company.responsible" 
             data-ng-options="seller.id as seller.login for seller in vm.sellers">
     </select>
   </td>
</tr>
  </table>

  <h2>Json vm.companies</h2>
  <pre>{{vm.companies | json}}</pre>

And your data probably look like this:

var StackController = function() {
  this.companies = [
    {
      name: 'company 1',
      responsible : 1
    },
     {
      name: 'company 2',
      responsible : 2
    },
     {
      name: 'company 3',
    }
  ];

  this.sellers = [
    {
      login : 'pavel',
      id : 1,
    },
    {
      login : 'petr',
      id : 2,
    },
    {
      login : 'igor',
      id : 3,
    }
  ];
};

angular.module('stackApp', [])
  .controller('StackController', StackController);

Model of select is company.seller which is connected to seller.id, syntax of ng-options can determine what is used as identifier and what is label.

seller.id as seller.login for seller in vm.sellers

One more thing to add, identifier could be not just id but whole object.