decode with javascript

I have a string that I am passing to a Django template.

<script>
var data = '[{"a": 0}, {"b": 1}]'
</script>
  1. Is there a way in JavaScript to extract keys as ["a", "b"]?
  2. Additionally, how can I create a JavaScript function to retrieve a value based on a given key?

Answer №1

To retrieve the information, simply parse it as JSON:

let myObject = JSON.parse(data);
myObject[0].a // accessing data within a
myObject[1].b // retrieving b from the object

Answer №2

To ensure your Python object can be understood by Javascript, it needs to be converted into a format such as JSON. This can be accomplished using the simplejson library in your view:

from django.utils import simplejson
from django.shortcuts import render

def some_view(request):
    ...
    python_data = [
        { 'name' : 'Alice', 'age' : 25 },
        ...
    ]
    json_data = simplejson.dumps(python_data)
    render(request, "some_template.html", { 'data' : json_data })

In your template, include the following script:

<script>
var data = {{ data|safe }}
</script>

(While Simplejson is suitable for converting regular Python objects, Django's serializers should be used if you need to convert a QuerySet)

Answer №3

Why not consider using JSON for your data?

from django.utils import simplejson

def myFunction(request):
    if not request.is_ajax():
        raise Http404
    information = list(
        dict(
            x=0,
            y=1
        )
    )
    return HttpResponse(simplejson.dumps(information), mimetype='application/json')

javascript (using axios in this example)

function fetchData(){
    axios.get('/your/api/endpoint/')
        .then(function(response){
            return response.data;
        })
        .catch(function(error){
            console.error('Error fetching data:', error);
        });
}

var dataFetched = fetchData();

Answer №4

  1. How can I extract keys as ["x", "y"] in JavaScript?

    var myArray = [{"x": 9}, {"y": 8}],
        keyArray = [];
    
    for (k in myArray) {
        if (myArray.hasOwnProperty(k)) {
            keyArray.push(Object.keys(myArray[k])[0]);
        }
    }
    
    console.log(JSON.stringify(keyArray)); // outputs ["x","y"]
    
  2. I also require a JavaScript function to fetch the value for a specific key.

    function retrieveValueByKey(arrKey, lookupKey) {
        for (k in arrKey) {
            if (arrKey.hasOwnProperty(k) && arrKey[k] === lookupKey) {
               return myArray[k][arrKey[k]];
            }
        }
    }
    
    console.log(retrieveValueByKey(myArray, keyArray, 'x')); // outputs 9
    

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