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how to make certain options bold in select using angularjs filter and ng-options

I am using the AngularJS ng-options to populate certain select element. I would like to make some options bold and make them disabled. I am trying to achieve this using the filter along with ng-options . I am able to read the values on the controller side of the angular js but I am unable to make them bold and disabled. I checked lot of answers but some reason none worked for me. Any help would be appreciated.

HTML Code for the select :

//HTML SELECT
<select class="form-control" id="ObjectId" ng-change="ObjectEventEPCsChange()" ng-model="formdata.ObjectId" ng-options='ObjectId.value as ObjectId.text  for ObjectId in ObjectIds |filter:MyFilter'>
    <option class="dropdown-item" value='' selected> Choose </option>
    <option class="dropdown-item" value="{{ ObjectId.value  }}"> {{ ObjectId.text }} </option>
</select>

ÀngularJS Controller function for filter : //Make some options bold and Disabled based on conditions

$scope.MyFilter = function(item) {
    if(item.text == 'ABCD')
    {
        console.log(item.toString().replace(item.text,"<strong>"+item.text+"</strong>"));
        return item.toString().replace(item.text,"<b>"+item.text+"</b>")
    }
    else
    {
        return item.toString().replace(item.text,"&nbsp;"+item.text);
    }
}

Populating of the options : I have the options in nodejs and following are the type of options that are populated into the Select:

var ObjectTypeOptions  =    [
                                {value:'Option-1',      text:'Option-1'},
                                {value:'Option-2',      text:'Option-2'},
                                {value:'Option-3',      text:'Option-3'},
                                {value:'ABCD',          text:'ABCD'},
                                {value:'Option-4',      text:'Option-4'},
                            ];

var returnData = {'ObjectTypeOptions': ObjectTypeOptions};

callback(returnData);

Following is the Angularjs method that returns the data to HTML and populates the select:

//On load of the page populate the drop-downs
$scope.init = function () {
    $http({
        url: "/populateFields",
        method: "GET"
    }).success(function(response) {
        $scope.ObjectIds    =   response.ObjectTypeOptions;
    }).error(function(error) {
        console.log(error);
    });
};

You can use ng-repeat and ng-disabled for disabling like:

 function TodoCrtl($scope) { $scope.ObjectIds = [{ value: "option1", text: "Option 1", class: "bold" },{ value: "option2", text: "Option 2", disabled: true }, { value: "option3", text: "Option 3" }]; }
 .bold { font-weight: bold; }
 <:DOCTYPE html> <html ng-app> <head> <script src="https.//ajax.googleapis.com/ajax/libs/angularjs/1.1.5/angular.min.js"></script> <meta charset=utf-8 /> <title>ng-click</title> </head> <body> <div ng-controller="TodoCrtl"> <select class="form-control" id="ObjectId" ng-change="ObjectEventEPCsChange()" ng-model="formdata.ObjectId"> <option class="dropdown-item" value='' selected> Choose </option> <option ng-repeat="ObjectId in ObjectIds" class="dropdown-item" ng-class="ObjectId.class" ng-disabled="ObjectId.disabled" value="{{ ObjectId.value }}"> {{ ObjectId.text }} </option> </select> </div> </body> </html>

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