单击按钮时不显示 Django 自定义验证

Question

我在 forms.py 中为我的表单编写了自定义验证，但它不起作用。它没有显示任何内容 ("email not exist")，当我按下提交按钮时，它看起来像是在刷新页面。如果有任何帮助，我将不胜感激。

这是我的 view.py:

def delete(request):
    if request.method == 'POST' and "DeleteButton" in request.POST:
        form = LoginPageDelete(request.POST)
        if form.is_valid():
            DeleteData = form.cleaned_data
            q = DeleteData["emailD"]
            query = Users.objects.get(email = q )
            query.delete()
            fetch = Users.objects.all()
            return render(request,'Result.html',{'QueryDelete':fetch.values(),})

    FormDelete = LoginPageDelete()
    return render(request,'delete.html',{"FormDelete":FormDelete,})

这是模板：

<html>
<head>
    <title>Delete</title>
</head>
<body>
    {% if FormDelete.errors  %}
    <p style="color:red">Please correct the problems</p>
    123
    {%endif%}

    <form action="" method="POST">
        <table>
            {{FormDelete.as_table}}
        </table>
        {%csrf_token%}
        <input type="submit" value="Delete" name="DeleteButton">
    </form>
</body>

这里是 forms.py:

from django import forms
from login.models import Users

class LoginPageDelete(forms.Form):
    emailD = forms.EmailField(required=True)

    def clean_emailD(self):
        email = self.cleaned_data['emailD']
        if not Users.objects.filter(email = email).exists():
            raise forms.ValidationError("email not exist")
        return email

Answer 1

您根本没有return将经过验证的表单添加到模板中。每次在您的视图中，您 return 一个 LoginPageDelete() 的新实例，并丢弃带有验证信息的实例。

def delete(request):
    if request.method == 'POST' and "DeleteButton" in request.POST:
        form = LoginPageDelete(request.POST)
        if form.is_valid():
            DeleteData = form.cleaned_data
            q = DeleteData["emailD"]
            query = Users.objects.get(email = q )
            query.delete()
            fetch = Users.objects.all()
            return render(request,'Result.html',{'QueryDelete':fetch.values(),})
    else:# here request.method is get or in your case "DeleteButton" not in request.POST
        form = LoginPageDelete()

    return render(request,'delete.html',{"FormDelete":form})

单击按钮时不显示 Django 自定义验证

django custom validation not showing up on button click

python

django

django-validation