Is there a way to have json.stringify continuously update itself in a loop?

Question

Is there a way to have json.stringify continuously update itself in a loop?

I am experiencing an issue with json.stringify. I have a button on-click event that triggers a function to add another object to the array variable.

var example = [{name: "K", age: 12},{name: "L", age: 12}];
var jsonE = JSON.stringify(example);

Despite adding more objects to the 'example' variable, the value of jsonE remains unchanged.

I am looking for a way to continuously update the json data as new objects are added to the array. Is there a specific loop or method I should be using?

SOLUTION:

Update the JSON.stringify when the on-click event is triggered.

javascript json

Answer 1

Answer №1

To retrieve objects from JSON format, you can use JSON.parse and then add new objects to it before converting it back to a string.

var example = [{name: "K", age: 12},{name: "L", age: 12}];
var jsonE = JSON.stringify(example);
// Retrieve objects
var exampleParsed = JSON.parse(jsonE);
// Add a new object
exampleParsed.push({name: "M", age: 13});
// Convert the updated array back to a string
JSON.stringify(exampleParsed);

// Output
"[{"name":"K","age":12},{"name":"L","age":12},{"name":"M","age":13}]"

Give this a try and see if it meets your needs (y).

Answer 2

To retrieve objects from JSON format, you can use JSON.parse and then add new objects to it before converting it back to a string.

var example = [{name: "K", age: 12},{name: "L", age: 12}];
var jsonE = JSON.stringify(example);
// Retrieve objects
var exampleParsed = JSON.parse(jsonE);
// Add a new object
exampleParsed.push({name: "M", age: 13});
// Convert the updated array back to a string
JSON.stringify(exampleParsed);

// Output
"[{"name":"K","age":12},{"name":"L","age":12},{"name":"M","age":13}]"

Give this a try and see if it meets your needs (y).

Answer 3

Answer №2

One effective method to separate the array from operations that rely on it is by conceptualizing the array as an observable entity

Here's how you can achieve this: encapsulate the array as an observable and then establish a callback for JSON.stringify dependency.

function ObservableArray() {
   var self = this;
   this.onPushCbs = [];
   this.array = []
   this.push = function(value) {
     this.array.push(value)
     this.onPushCbs.forEach(function(cb) {
        cb(self.array);
     })
   }
}

var arr = new ObservableArray()
// ObservableArray {onPushCbs: Array[0], array: Array[0]}
// Register an event so that every time the array is pushed, the value will
// be logged
arr.onPushCbs = [function(a) { console.log(a)}]
arr.push('1')
// Logs ['1']

Answer 4

One effective method to separate the array from operations that rely on it is by conceptualizing the array as an observable entity

Here's how you can achieve this: encapsulate the array as an observable and then establish a callback for JSON.stringify dependency.

function ObservableArray() {
   var self = this;
   this.onPushCbs = [];
   this.array = []
   this.push = function(value) {
     this.array.push(value)
     this.onPushCbs.forEach(function(cb) {
        cb(self.array);
     })
   }
}

var arr = new ObservableArray()
// ObservableArray {onPushCbs: Array[0], array: Array[0]}
// Register an event so that every time the array is pushed, the value will
// be logged
arr.onPushCbs = [function(a) { console.log(a)}]
arr.push('1')
// Logs ['1']

Is there a way to have json.stringify continuously update itself in a loop?

Answer №1

Answer №2

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