Setting selected item in angular md-select with multiple option

问题

Setting selected item in angular md-select with multiple option

<md-select multiple ng-model="Reg.roles" placeholder="Please select roles" required>
    <md-option ng-repeat="role in roles" value="{{role.value}}" ng-selected="{{ role.value === '<%= data.roles %>' ? 'true' : 'false' }}">{{ role.name }}</md-option>
</md-select>

in my controller

 $scope.roles = [{
        "name": "Account Admin",
        "value": "account_admin"
    }, {
        "name": "Developer",
        "value": "developer"
    },


    {
        "name": "Analyst",
        "value": "analyst"
    }
];

in view

data.roles contains value:

['account_admin', 'developer']

I need the item corresponding to role.value should be in selected state.

Refer below image

回答1:

Finally i found the solution, in my controller i wrote this:

var current_roles       = '<%=data.roles%>'; // current value from db as array

$scope.Reg.roles = []; //initialize array

angular.forEach($scope.roles, function(val1, key1) {
    if(current_roles.indexOf(val1['value']) !== -1) // check if item in current array
    {
        $scope.Reg.roles.push(val1['value']); //setting to select items
    }
});

回答2:

I dunno how valid this is or if this tackles the same problem but another thing that you could do is that in your HTML, pass in role instead of role.value. So it would look something like this:

<md-select multiple ng-model="Reg.roles" placeholder="Please select roles" required>
<md-option ng-repeat="role in roles" value="{{role}}" ng-selected="{{ role.value === '<%= data.roles %>' ? 'true' : 'false' }}">{{ role.name }}</md-option>

This allows you to work with the entire object in your controller and you can manipulate it as you wish.

来源：https://stackoverflow.com/questions/42436358/setting-selected-item-in-angular-md-select-with-multiple-option