Django编辑表单未显示附件链接

下午好

我在尝试创建编辑模板时遇到一个查询，我通过api调用检索数据。当我在django form.Forms中输入数据时，附件显示为空白

这是Form.py文件

class PaymentListForm(forms.Form):

  Title = forms.CharField(max_length=50)
  Receipt_Amount = forms.DecimalField(max_digits=8, decimal_places=2)
  Request_Amount = forms.DecimalField(max_digits=8, decimal_places=2)
  Receipt_Attachment = forms.FileField()

   def __init__(self, *args, **kwargs):
    super(PaymentListForm, self).__init__(*args, **kwargs)

这是views.py文件

def edit_payments(request, trn_pk):
    trns = get_transaction_by_id(trn_pk)
    data = trns['data']
    if request.method == 'GET':
        form = PaymentListForm(initial=data)
        return render(request, 'paymentlist/createeditpayments.html', {'form': form})

我可以确认，在数据字典中有附件的链接，但不知何故，在表格中附件丢失了

有人帮忙吗

---

感谢

无法像在CharField或DecimalField中那样为FileField设置初始值，但有一种方法可以解决此问题。我们需要的是隐藏forms.FileField并通过标签处理加载文件，并将初始数据显示为文本。因此，首先隐藏forms.FileField：

forms.py：

class PaymentListForm(forms.Form):
  Title = forms.CharField(max_length=50)
  Receipt_Amount = forms.DecimalField(max_digits=8, decimal_places=2)
  Request_Amount = forms.DecimalField(max_digits=8, decimal_places=2)
  Receipt_Attachment = forms.FileField(label="", widget=forms.FileInput(
      attrs={'style': "display: none",},
  ), )

  def __init__(self, *args, **kwargs):
    super(PaymentListForm, self).__init__(*args, **kwargs)

<form method="POST" action="" enctype="multipart/form-data">
   {% csrf_token %}

   {{ form.as_p }}

   <span>Receipt attachment: </span>  
   <label for="id_Receipt_Attachment" class="mt-2 btn btn-primary " style="cursor: pointer;">Choose file...</label>
   <span id="receipt_url"> {{ url_of_receipt }}</span>
   <br><br>
   <button class="btn btn-primary" role="button" type="submit">
     Save
   </button>

def edit_payments(request, trn_pk):
    trns = get_transaction_by_id(trn_pk)
    data = trns['data']
    if request.method == 'GET':
        form = PaymentListForm(initial=data)
        return render(request, 'paymentlist/createeditpayments.html', {'form': form, 'url_of_receipt': data['Receipt_Attachment']})

现在我们需要添加标签来处理上传文件，而不是forms.FileField和标签，在这里我们将显示关于附件url的信息。我不确定html模板到底是什么样子的，所以我做了一些通用的一个重要的标记，我们需要放在标记里面

createeditpayments.html：

class PaymentListForm(forms.Form):
  Title = forms.CharField(max_length=50)
  Receipt_Amount = forms.DecimalField(max_digits=8, decimal_places=2)
  Request_Amount = forms.DecimalField(max_digits=8, decimal_places=2)
  Receipt_Attachment = forms.FileField(label="", widget=forms.FileInput(
      attrs={'style': "display: none",},
  ), )

  def __init__(self, *args, **kwargs):
    super(PaymentListForm, self).__init__(*args, **kwargs)

<form method="POST" action="" enctype="multipart/form-data">
   {% csrf_token %}

   {{ form.as_p }}

   <span>Receipt attachment: </span>  
   <label for="id_Receipt_Attachment" class="mt-2 btn btn-primary " style="cursor: pointer;">Choose file...</label>
   <span id="receipt_url"> {{ url_of_receipt }}</span>
   <br><br>
   <button class="btn btn-primary" role="button" type="submit">
     Save
   </button>

def edit_payments(request, trn_pk):
    trns = get_transaction_by_id(trn_pk)
    data = trns['data']
    if request.method == 'GET':
        form = PaymentListForm(initial=data)
        return render(request, 'paymentlist/createeditpayments.html', {'form': form, 'url_of_receipt': data['Receipt_Attachment']})

我假设

数据

是一个结构如下的字典：

        data = {
            'Title': 'Example title',
            'Receipt_Amount': 21.99,
            'Request_Amount': 34,
            'Receipt_Attachment': 'media/example.receipt.pdf' 
        }

现在我们有了这样的输出： 最后一件事是点击标签后打开上传文件。我认为最好的方法是使用jQuery和短脚本。因此，我在createeditpayments.html的底部放置以下代码： createditpayments.html

{% block javascript %}
    <script>
        // fetch url from hidden FieldField and insert it next to upload button
        $("#id_Receipt_Attachment").change(function () {
            {#readURL(this);#}
            $('#receipt_url').text(' ' + this.files[0].name);
        });
    </script>
{% endblock %}

现在标签应该上传文件并更改旁边的url。

---

恐怕这是不可能的，请参见