Django Forms实例

时间：2022-02-11 15:55:21
# Django的Form主要具有一下几大功能：

#

#     生成HTML标签

#     验证用户数据（显示错误信息）

#     HTML Form提交保留上次提交数据

#     初始化页面显示内容

# forms组件生成HTML标签格式

# class 表名Form(Form):

#     字段名 = fields.字段类型(

#         初始值,

#         widgets=widgets.插件(attrs={html属性标签 字典格式})

#     )

1.urls.py

url(r'^student', student),

2.models.py

from django.db import models

# Create your models here.

class Class(models.Model):

    title = models.CharField(max_length=32)

    teachers = models.ManyToManyField("Teacher")

    def __str__(self):

        return self.title

class Teacher(models.Model):

    name = models.CharField(max_length=32)

    def __str__(self):

        return self.name

class Student(models.Model):

    username = models.CharField(max_length=16,unique=True)

    age = models.IntegerField()

    gender = models.BooleanField()

    classes = models.ForeignKey("Class")

    def __str__(self):

        return self.username

2.form.py

from .models import Student, Class, Teacher

# Create your froms here.

from django.forms import Form

from django.forms import widgets

from django.forms import fields

class StudentForm(Form):

    username = fields.CharField()(
　　　　　widget=widgets.TextInput(attrs={"style":"color:red;"},)
   )

    age = fields.IntegerField()

    gender = fields.ChoiceField(

        choices=((1, "男"), (0, "女"),),

        initial=1,

        widget=widgets.Select

    )

    classes = fields.IntegerField(

        initial=1,

        widget=widgets.Select()

    )

　　　　
　　
　　# 绑定动态数据

    def __init__(self, *args, **kwargs):

        super(StudentForm, self).__init__(*args, **kwargs)

        self.fields["classes"].widget.choices = Class.objects.all().values_list("id", "title")

4.views.py

from .forms import StudentForm

from .models import Student,Class,Teacher

def student(request):

    if request.method == "GET":

        obj = StudentForm()

        return render(request, "t1/student.html", locals())

    elif request.method == "POST":

        obj = StudentForm(request.POST)

        if obj.is_valid():

            try:

                val = obj.clean()

                print(val)

                Student.objects.create(username=val["username"], age=val["age"], gender=val["gender"],

                                       classes_id=val["classes"])

                return HttpResponse(val["username"] + "添加完成")

            except Exception as e:

                return HttpResponse("数据错误，请重新输入")

        else:

            print(obj.clean())

            return HttpResponse("ERROR")

    else:

        return HttpResponse("error")

5.student.html

<!DOCTYPE html>

<html lang="zh-CN">

<head>

    <meta charset="UTF-8">

    <title>Title</title>

</head>

<body>

<form action="/student/" method="POST" enctype="multipart/form-data">

    {% csrf_token %}

    <p>用户名：{{ obj.username }} {{ obj.username.errors }}</p>

    <p>年&nbsp;&nbsp;龄：{{ obj.age }}{{ obj.age.errors }}</p>

    <p>性&nbsp;&nbsp;别：{{ obj.gender }}</p>

    <p>班&nbsp;&nbsp;级：{{ obj.classes }}</p>

    <input type="submit"value="添加用户"/>

</form>

</body>

</html>

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