Showcasing form validation errors using django and ajax

Question

Showcasing form validation errors using django and ajax

I have set up a contact form using Django and AJAX for users to reach out to me. The current setup works smoothly if no errors occur, but I want to enhance it further by displaying any errors above the input fields along with the inputs themselves. While it already handles success and error scenarios for AJAX requests, I need help in showing specific form errors on the front-end. Any assistance on achieving this would be greatly appreciated. Thank you.

views:

def contact(request):
    if request.is_ajax() and request.POST:
        form = ContactForm(request.POST)
        if form.is_valid():
            new_contact = form.save()
            data = {
                'result': 'success',
                'message': 'Message Sent.'
            }
            return JsonResponse(data)
        else:
            data = {
                'result': 'error',
                'message': 'Form invalid',
                'form': 'oops.'
            }
            return JsonResponse(data)
    else:
        form = ContactForm()
        return render(request, 'public_contact.html', {
            'form': form
        })

js:

contact_right_form.find('#submit').on('click', function(event) {
    event.preventDefault();
    $.ajax({
        type: contact_right_form.attr('method'),
        url: '/contact/',
        data: contact_right_form.serialize(),
        dataType: 'json',
        success: function(data) {
            if ( data.result == 'success') {
                contact_right_message_sent.text(data.message);
                contact_right_message_sent.show();
            }
            else {
                contact_right_message_sent.text(data.message);
                contact_right_message_sent.show();
            }
        },
        error: function() {
            contact_right_message_sent.text('Sorry! Something went wrong.')
        }
    });
})

Update

I aim to replicate the error display similar to how it appears without using AJAX:

https://i.stack.imgur.com/m5ChD.jpg

jquery ajax django django-forms

Answer 1

Answer №1

Using Django Form Errors in JSON Format

If you encounter errors with django form and need to return them in json format, you can utilize the form.errors.as_json() method. For instance:


    {
        "sender": [
            {
                "message": "Enter a valid email address.", 
                "code": "invalid"
            }
        ],
        "subject": [
            {
                "message": "This field is required.", 
                "code": "required"
              }
          ]
    }

Upon receiving a response through an ajax call, assume that the data object has been structured as follows:


      data = {
      "sender": [
          {
              "message": "Enter a valid email address.", 
              "code": "invalid"
          },
          {
              "message": "Enter a .", 
              "code": "invalid"
          }
        ], 
        "subject": [
          {
              "message": "This field is required.", 
              "code": "required"
          }
        ]
    };

Assuming you have already rendered the form elements:


    <input type="text" name="sender"> <br>
    <input type="text" name="subject"> <br>
    <button>Submit</button>

To display these error messages, you can include scripts within click events:


    // Handle ajax success event on button click
    if ($("input").next('p').length) $("input").nextAll('p').empty();
    for (var name in data) {
        for (var i in data[name]) {
        // Retrieve error message from django object
        var $input = $("input[name='"+ name +"']");
        $input.after("<p>" + data[name][i].message + "</p>");
        }
    }

Example Simulation:

// Simulated example based on data obtained from ajax response

        var data = {
        "sender": [
            {
                "message": "Enter a valid email address.", 
                "code": "invalid"
            },
            {
            "message": "Enter a .", 
                "code": "invalid"
            }
            ],
        "subject": [
            {
                "message": "This field is required.", 
                "code": "required"
            }
            ]
        };

        $("button").on("click", function() {
            if ($("input").next('p').length) $("input").nextAll('p').empty();
            for (var name in data) {
                for (var i in data[name]) {
                // Retrieve error message from django object
                var $input = $("input[name='"+ name +"']");
                $input.after("<p>" + data[name][i].message + "</p>");
                }
            }
        });

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
          <input type="text" name="sender"> <br>
          <input type="text" name="subject"> <br>
          <button>Submit</button>

Answer 2

Using Django Form Errors in JSON Format

If you encounter errors with django form and need to return them in json format, you can utilize the form.errors.as_json() method. For instance:


    {
        "sender": [
            {
                "message": "Enter a valid email address.", 
                "code": "invalid"
            }
        ],
        "subject": [
            {
                "message": "This field is required.", 
                "code": "required"
              }
          ]
    }

Upon receiving a response through an ajax call, assume that the data object has been structured as follows:


      data = {
      "sender": [
          {
              "message": "Enter a valid email address.", 
              "code": "invalid"
          },
          {
              "message": "Enter a .", 
              "code": "invalid"
          }
        ], 
        "subject": [
          {
              "message": "This field is required.", 
              "code": "required"
          }
        ]
    };

Assuming you have already rendered the form elements:


    <input type="text" name="sender"> <br>
    <input type="text" name="subject"> <br>
    <button>Submit</button>

To display these error messages, you can include scripts within click events:


    // Handle ajax success event on button click
    if ($("input").next('p').length) $("input").nextAll('p').empty();
    for (var name in data) {
        for (var i in data[name]) {
        // Retrieve error message from django object
        var $input = $("input[name='"+ name +"']");
        $input.after("<p>" + data[name][i].message + "</p>");
        }
    }

Example Simulation:

// Simulated example based on data obtained from ajax response

        var data = {
        "sender": [
            {
                "message": "Enter a valid email address.", 
                "code": "invalid"
            },
            {
            "message": "Enter a .", 
                "code": "invalid"
            }
            ],
        "subject": [
            {
                "message": "This field is required.", 
                "code": "required"
            }
            ]
        };

        $("button").on("click", function() {
            if ($("input").next('p').length) $("input").nextAll('p').empty();
            for (var name in data) {
                for (var i in data[name]) {
                // Retrieve error message from django object
                var $input = $("input[name='"+ name +"']");
                $input.after("<p>" + data[name][i].message + "</p>");
                }
            }
        });

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
          <input type="text" name="sender"> <br>
          <input type="text" name="subject"> <br>
          <button>Submit</button>

Answer 3

Answer №2

Make sure to include the status_code parameter when using the JsonResponse function.

return JsonResponse(data, status_code=400)

By doing this, the response will be directed to the error callback in $.ajax.

Answer 4

Make sure to include the status_code parameter when using the JsonResponse function.

return JsonResponse(data, status_code=400)

By doing this, the response will be directed to the error callback in $.ajax.

Answer 5

Answer №3

If you prefer not to send all JSON data back with errors added to the fields, an alternative method is to generate a partial template consisting of just the form and return the HTML content to the browser. Subsequently, you can replace the existing form with the newly returned form.

While this may not be the optimal solution, it is one possible approach to handling form submissions.

For instance, suppose you have a file named /form.html that is included on the page:

{% include 'form.html' %}

In your form_invalid method, return the rendered HTML string like so:

return render(self.request, 'form.html', {'form': form}, status=500)

Then in your JavaScript error method, update the form on the page by replacing it with the HTML content received from the server.

Answer 6

If you prefer not to send all JSON data back with errors added to the fields, an alternative method is to generate a partial template consisting of just the form and return the HTML content to the browser. Subsequently, you can replace the existing form with the newly returned form.

While this may not be the optimal solution, it is one possible approach to handling form submissions.

For instance, suppose you have a file named /form.html that is included on the page:

{% include 'form.html' %}

In your form_invalid method, return the rendered HTML string like so:

return render(self.request, 'form.html', {'form': form}, status=500)

Then in your JavaScript error method, update the form on the page by replacing it with the HTML content received from the server.

Showcasing form validation errors using django and ajax

Answer №1

Answer №2

Answer №3

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