Angular 1: Assign unique identifiers to newly generated objects

I'm in need of a solution for my form where each input creates a new object. Currently, I have a method that adds new objects without assigning unique IDs. Can anyone suggest an Angular approach to generate IDs for these objects?

$scope.addToDoItem = function(){
  var toDoItems = $scope.toDoItems;
  var newToDoItem = {
    "id" : // id should be generated here
    "content" : $scope.toDoItem,
    "createdAt" : Date.now()
  }
  toDoItems.push(newToDoItem);
  ls.set("toDoData", toDoItems);
  $scope.toDoItem = "";
};

This is the view:

  <form>
    <input type="text" ng-model="toDoItem">
    <input type="submit" ng-click="addToDoItem()">
  </form>
javascriptangularjs

Answer №1

There may not be a specific "angular way" to accomplish this task.

Currently, you are utilizing milliseconds for the createdAt value, so you can also use this value for the ID field. If your application does not frequently add new values, this approach will provide you with unique identifiers:

var currentDate = Date.now();
var newToDoItem = {
    "id" : currentDate,
    "content" : $scope.toDoItem,
    "createdAt" : currentDate
}

The drawback of this method is that the ID values will be large and non-sequential. If you prefer IDs in order (1, 2, 3, etc.), you can create a variable in your controller to keep track of the maximum ID and increment it accordingly:

var maxId = 0;
//if you need to restore maxId you can use
//var maxId = $scope.toDoItems.reduce(function(max,cur){return Math.max(max,cur.id); },0);
$scope.addToDoItem = function(){
  var toDoItems = $scope.toDoItems;
  maxId++;
  var newToDoItem = {
    "id" : maxId,
    "content" : $scope.toDoItem,
    "createdAt" : Date.now()
  }
  toDoItems.push(newToDoItem);
  ls.set("toDoData", toDoItems);
  $scope.toDoItem = "";
};

Answer №2

If you're in need of generating a random hash, there's another method that you can try:

$scope.addToDoItem = function() {
var toDoItems = $scope.toDoItems;
var newToDoItem = {
    "id": function generateRandomHash() {
        var hashLength = 32; // specify desired length of the hash
        var hashStr = "";
        while (hashStr.length < hashLength && hashLength > 0) {
            var randomNumber = Math.random();
            hashStr += (randomNumber < 0.1 ? Math.floor(randomNumber * 100) : String.fromCharCode(Math.floor(randomNumber * 26) + (randomNumber > 0.5 ? 97 : 65)));
        }
        return hashStr;
    },
    "content": $scope.toDoItem,
    "createdAt": Date.now()
}
toDoItems.push(newToDoItem);
ls.set("toDoData", toDoItems);
$scope.toDoItem = "";
};

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