Django Forms: How to Handle File Uploads with Custom Validation for Large Files?
I've hit a wall trying to I'm getting frustrated with Could someone explain I'm working on a Django project where I need to implement file uploads using a custom form. My current implementation throws a `ValidationError` when trying to upload large files, but I want to handle these cases differently. Specifically, I want to provide feedback to the user before the upload occurs, rather than relying on the default behavior response after the upload attempt. Here's a snippet of my form code: ```python from django import forms class MyFileForm(forms.Form): file = forms.FileField() def clean_file(self): file = self.cleaned_data.get('file') if file.size > 5 * 1024 * 1024: # 5 MB limit raise forms.ValidationError('File too large ( > 5 MB )') return file ``` In my template, I'm currently using the standard Django form rendering: ```html <form method="post" enctype="multipart/form-data"> {% csrf_token %} {{ form.as_p }} <button type="submit">Upload</button> </form> ``` The scenario arises when I upload a file larger than 5 MB. The form does not provide any feedback until after the file is uploaded, which can be frustrating for users. I want to implement client-side validation to give immediate feedback before the form is submitted. I've tried adding JavaScript to check the file size before submission, but I'm not sure how to effectively integrate that with the Django form. Here's my current JavaScript code: ```javascript document.getElementById('id_file').addEventListener('change', function(event) { const file = event.target.files[0]; if (file.size > 5 * 1024 * 1024) { alert('File too large ( > 5 MB )'); event.target.value = ''; // Clear the input } }); ``` However, I notice that this doesn’t seem to trigger the Django validation, which is what I want to avoid. I want to ensure that my server-side validation complements the client-side checks seamlessly. Is there a recommended approach to achieve this without duplicating validations or causing confusion for users? My development environment is Debian. Thanks in advance! This is my first time working with Python 3.9. I'm working on a microservice that needs to handle this. Am I missing something obvious? What am I doing wrong?