how to bind default value to select using ng-model using AngularJS V1.6

Answer 1

Use null for the unselected value:

̶$̶s̶c̶o̶p̶e̶.̶m̶a̶c̶h̶i̶n̶e̶S̶e̶l̶e̶c̶t̶e̶d̶ ̶=̶ ̶"̶"̶;̶
$scope.machineSelected = null;

The ng-options directive was re-factored with AngularJS V1.6. Before then the default could be selected with an empty string. Now the default is selected by assigning null to the model.

For more infomation, see

• AngularJS API Reference - Using select with ngOptions and setting a default value
• AngularJS ng-options Directive API Reference
• AngularJS Developer Guide - Migrating to V1.6 - select directve
• ng-options is hiding the blank value with AngularJS V1.5

The DEMO

angular.module("app",[])
.controller("ctrl",function($scope){
  $scope.machineList = [
    { _id:1, name: "Megatron" },
    { _id:2, name: "Starscream" },
    { _id:3, name: "Shockwave" },
  ];
  $scope.machineSelected = null;
})