Clear AnguAutocomplete TextBox on DropDown selection in AngularJS

How to clear the autocomplete textbox field after clicking on a value from the dropdown in angularjs

    $scope.hide = true;
    //$scope.fnamePicked = false;
    $scope.mydata = null;
    $scope.total = null;
    $scope.Search = function () {
        $scope.fnamePicked = true;
        debugger;
        $http.get(apiUrl + "/api/Warehouse/GetCastingDetails?PARTID=" + $scope.Selectinvoice.originalObject.PARTID + "")
        .then(function (response) {
            debugger;            
            $scope.mydata = JSON.parse(response.data);             
            $scope.InvoiceNo = $scope.mydata[0].InvoiceNo;
            $scope.InvoiceDate = $scope.mydata[0].InvoiceDate;
            $scope.PartName = $scope.mydata[0].PartName;
            $scope.InvoiceQty = $scope.mydata[0].InvoiceQty;
            $scope.IssuedQty = $scope.mydata[0].IssuedQty;
            $scope.Stock = $scope.mydata[0].Stock;
            $scope.Rejected = $scope.mydata[0].Rejected;
            $scope.hide = false;       
        });
        $http.get(apiUrl + "/api/Warehouse/GetCastingwiseTotal?PARTID=" + $scope.Selectinvoice.originalObject.PARTID + "")
       .then(function (response) {
           $scope.total = JSON.parse(response.data);
           $scope.totalAccepted = $scope.total[0].TotalAccepted;
           $scope.totalIssued = $scope.total[0].TotalIssued;
           $scope.totalStock = $scope.total[0].TotalStock;
           $scope.totalRejected = $scope.total[0].TotalRejected;
           $scope.hide = false;
       });
    }

<angucomplete-alt id="txtinvnumber"
    placeholder="Search Part Name/No"
    pause="100"
    selected-object="Selectinvoice"
    remote-url=apiUrl + "/api/Warehouse/GetCastingwiseInvoices"
    remote-url-data-field=""
    local-data="warehouse"
    search-fields="PARTNAME"
    title-field="PARTNAME"
    minlength="1"
    input-class="form-control mr-sm-2"
    match-class="highlight"                                  
    ng-click="Search()"></angucomplete-alt>