How to send data from javascript function to Django View

Question

I am trying to send data from a javascript function that generates a random string upon the page loading to a Django view. I don't know how to structure the script tag to send the data after the page has loaded and the views.py to receive the data. I am new to javascript and don't quite know how to go about this. I appreciate any help provided.

index.html

<script>

    function makeid(length) {
        var result           = '';
        var characters       = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
        var charactersLength = characters.length;
        for ( var i = 0; i < length; i++ ) {
            result += characters.charAt(Math.floor(Math.random() * charactersLength));
        }
        return result;
    }
    console.log(makeid(9));

</script>

You need to rephrase your question to know what are you trying to do. Check here developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest — ajorquera
– ajorquera, Commented Mar 12, 2020 at 12:09

Majid Adibian · Accepted Answer · 2020-03-13 16:34:47Z

4

You can use ajax to send data to Django view like following code.

javascript:

function makeid(length) {
    var result           = '';
    var characters       = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
    var charactersLength = characters.length;
    for ( var i = 0; i < length; i++ ) {
        result += characters.charAt(Math.floor(Math.random() * charactersLength));
    }
    $.ajax({
        type: "GET",
        url: '/my_def_in_view',
        data: {
            "result": result,
        },
        dataType: "json",
        success: function (data) {
            // any process in data
            alert("successfull")
        },
        failure: function () {
            alert("failure");
        }
    });
}

urls.py:

urlpatterns = [
               url(r'^my_def_in_view$', views.my_def_in_view, name='my_def_in_view'),
               ...
]

views.py:

def my_def_in_view(request):
    result = request.GET.get('result', None)
    # Any process that you want
    data = {
            # Data that you want to send to javascript function
    }
    return JsonResponse(data)

If it was successfull it goes back to "success" part.

edited Mar 13, 2020 at 16:34

answered Mar 12, 2020 at 12:46

Majid Adibian

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2 Comments

AllanM007 Over a year ago

Thank You, I was able to solve the problem thanks to your answer

Majid Adibian Over a year ago

You're welcome. Great, so please accept this as the right answer to help other people who have the same problem.

David Pineda Osorio · Accepted Answer · 2020-03-14 12:06:42Z

you can do that in two ways:

Tradicional with ajax
Websockets: With django channels

If you want to send a bit of information, an ajax request is enough, you have to set and address and a view to receive the POST or GET ajax request.

I recommend to you use pure JS, not jquery

For example, this is a call to refresh a captcha image....

 /*Agregar boton refresh al lado del campo input*/
 let captcha_field =
     document.getElementById('captcha-field-registro_1').parentNode;
 let refresh_button=document.createElement('BUTTON');
 refresh_button.addEventListener('click',refresh_captcha)

 refresh_button.innerHTML = "Refrescar Captcha";                   // Insert text
 captcha_field.appendChild(refresh_button);

 let url_captcha= location.protocol + "//" +
                  window.location.hostname + ":" +
                  location.port + "/captcha/refresh/";

 let id_captcha_0="captcha-field-registro_0"
 function refresh_captcha(){
     let xhr = new XMLHttpRequest();
     xhr.open('GET', url_captcha, true);
     xhr.onload = function recv_captcha_load(event){
         console.log("event received", event,
                     "state",xhr.readyState);

         let data_txt = xhr.responseText;
         let data_json = JSON.parse(data_txt);
         console.log("Data json", data_json);

         if (xhr.readyState==4){
             if (xhr.status==200){
                 console.log("LOAD Se ha recibido esta información", event);
                 let captcha_img=document.getElementsByClassName('captcha')[0];
                 console.log("Catpcha img dom", captcha_img);
                 captcha_img.setAttribute('src', data_json['image_url'])
                 document.getElementById(id_captcha_0).value=data_json['key']
             }
             else{
                 console.log("Error al recibir")

             }
         }

     };

     var csrftoken = getCookie('csrftoken');
     xhr.setRequestHeader('X-Requested-With', 'XMLHttpRequest');
     xhr.setRequestHeader("X-CSRFToken", csrftoken);
     xhr.send();
 }

 function getCookie(name) {
     let cookieValue = null;
     if (document.cookie && document.cookie !== '') {
         var cookies = document.cookie.split(';');
         for (let i = 0; i < cookies.length; i++) {
             let cookie = cookies[i].trim();
             // Does this cookie string begin with the name we want?
             if (cookie.substring(0, name.length + 1) === (name + '=')) {
                 cookieValue = decodeURIComponent(cookie.substring(name.length + 1));
                 break;
             }
         }
     }
     return cookieValue;
 }

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