Strategies for formatting JSON data in a controller

Question

Strategies for formatting JSON data in a controller

As someone who is new to AngularJS and JSON, I am facing an issue when trying to filter out unnecessary fields in the JSON data.

In my controller, I have the following code snippet:

var data = $scope.choices; // This is an array
var datav = (JSON.stringify(data)); // Converting the array into a string for filtering
alert(datav);

When I use alert(datav), the JSON data displayed includes unwanted fields like $$hashKey and id:

[{"title":"g","$$hashKey":"object:3"},{"id":"choice2","$$hashKey":"object:6","title":"ghgh"},{"id":"choice3","$$hashKey":"object:11","title":"fgh"}]

I only want to extract the "title" field and exclude $$hashKey and id. How can I achieve this?

javascript angularjs arrays json

Answer 1

Answer №1

To avoid including $$hashkey in your JSON output, consider using angular.toJson instead of JSON.stringify.

angular.toJson

This function serializes input into a JSON-formatted string while stripping properties with leading $$ characters that AngularJS uses internally.

For example,

var myobj = [{
  "title": "g",
  "$$hashKey": "object:3"
}, {
  "id": "choice2",
  "$$hashKey": "object:6",
  "title": "ghgh"
}, {
  "id": "choice3",
  "$$hashKey": "object:11",
  "title": "fgh"
}]

console.log(angular.toJson(myobj))
console.log(JSON.stringify(myobj))

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>

Edit: If you only need to display specific properties, utilize Array.map as suggested by other responses. angular.toJson is beneficial when excluding $$hashkey specifically while keeping everything else intact.

Answer 2

To avoid including $$hashkey in your JSON output, consider using angular.toJson instead of JSON.stringify.

angular.toJson

This function serializes input into a JSON-formatted string while stripping properties with leading $$ characters that AngularJS uses internally.

For example,

var myobj = [{
  "title": "g",
  "$$hashKey": "object:3"
}, {
  "id": "choice2",
  "$$hashKey": "object:6",
  "title": "ghgh"
}, {
  "id": "choice3",
  "$$hashKey": "object:11",
  "title": "fgh"
}]

console.log(angular.toJson(myobj))
console.log(JSON.stringify(myobj))

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>

Edit: If you only need to display specific properties, utilize Array.map as suggested by other responses. angular.toJson is beneficial when excluding $$hashkey specifically while keeping everything else intact.

Answer 3

Answer №2

If you want to extract specific properties from an array of objects, you can utilize the Array.map() method. This allows you to filter out only the properties that you are interested in.

var data = [{"title":"g","$$hashKey":"object:3"},{"id":"choice2","$$hashKey":"object:6","title":"ghgh"},{"id":"choice3","$$hashKey":"object:11","title":"fgh"}];

var filteredData = data.map(d => ({title: d.title}));

console.log(filteredData)

Answer 4

If you want to extract specific properties from an array of objects, you can utilize the Array.map() method. This allows you to filter out only the properties that you are interested in.

var data = [{"title":"g","$$hashKey":"object:3"},{"id":"choice2","$$hashKey":"object:6","title":"ghgh"},{"id":"choice3","$$hashKey":"object:11","title":"fgh"}];

var filteredData = data.map(d => ({title: d.title}));

console.log(filteredData)

Answer 5

Answer №3

Give this a try:

<html>
<head>
<script Src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.6.1/angular.js"></script>

<script>
var app=angular.module("myapp", []);
app.controller("namesctrl", function($scope){
            var data = [{"title":"g","$$hashKey":"object:3"},{"id":"choice2","$$hashKey":"object:6","title":"ghgh"},{"id":"choice3","$$hashKey":"object:11","title":"fgh"}];
            var data1 = data.map(d => ({title: d.title}));
            console.log(data1);
});


</script>


</head>
<body ng-app="myapp" ng-controller="namesctrl"></body>
</html>

Answer 6

Give this a try:

<html>
<head>
<script Src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.6.1/angular.js"></script>

<script>
var app=angular.module("myapp", []);
app.controller("namesctrl", function($scope){
            var data = [{"title":"g","$$hashKey":"object:3"},{"id":"choice2","$$hashKey":"object:6","title":"ghgh"},{"id":"choice3","$$hashKey":"object:11","title":"fgh"}];
            var data1 = data.map(d => ({title: d.title}));
            console.log(data1);
});


</script>


</head>
<body ng-app="myapp" ng-controller="namesctrl"></body>
</html>

Answer 7

Answer №4

If you're looking to extract specific data from an array, consider using Array.prototype.map.

Start by defining your array like this:

 const info = [
  {name: "Alice", age: 25},
  {name: "Bob", age: 30},
  {name: "Charlie", age: 35},
]

const extractedData = info.map( person => {
  return {name: person.name}
});

console.log(extractedData);

Answer 8

If you're looking to extract specific data from an array, consider using Array.prototype.map.

Start by defining your array like this:

 const info = [
  {name: "Alice", age: 25},
  {name: "Bob", age: 30},
  {name: "Charlie", age: 35},
]

const extractedData = info.map( person => {
  return {name: person.name}
});

console.log(extractedData);

Answer 9

Answer №5

let transformedData = $scope.choices.map((index, item) => {
    return {id: item.id};
});

Here is a method to extract the desired object from an array of choices using JavaScript's map function.

Answer 10

let transformedData = $scope.choices.map((index, item) => {
    return {id: item.id};
});

Here is a method to extract the desired object from an array of choices using JavaScript's map function.

Answer 11

Answer №6

It seems like a third-party library is being utilized in your code. My hunch is that the Angular Material library might be involved, as it tends to add a similar $$haskey property to dropdown array values. Generally, this addition should not affect your array functionality and you should still be able to access your desired properties within the array object.

However, if you specifically wish to remove these extra properties, you can create a new array based on the existing one using the .map function. For example:

var newArray = originalArray.map(element => ({title: element.title}));

You can selectively extract certain properties while leaving out others. The resulting new array will have a distinct reference from the original one.

I hope this explanation proves helpful to you.

Answer 12

It seems like a third-party library is being utilized in your code. My hunch is that the Angular Material library might be involved, as it tends to add a similar $$haskey property to dropdown array values. Generally, this addition should not affect your array functionality and you should still be able to access your desired properties within the array object.

However, if you specifically wish to remove these extra properties, you can create a new array based on the existing one using the .map function. For example:

var newArray = originalArray.map(element => ({title: element.title}));

You can selectively extract certain properties while leaving out others. The resulting new array will have a distinct reference from the original one.

I hope this explanation proves helpful to you.

Strategies for formatting JSON data in a controller

Answer №1

`angular.toJson`

Answer №2

Answer №3

Answer №4

Answer №5

Answer №6

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