Form介绍

我们之前在HTML页面中利用form表单向后端提交数据时，都会写一些获取用户输入的标签并且用form标签把它们包起来。

与此同时我们在好多场景下都需要对用户的输入做校验，比如校验用户是否输入，输入的长度和格式等正不正确。如果用户输入的内容有错误就需要在页面上相应的位置显示对应的错误信息.。

Django form组件就实现了上面所述的功能。

总结一下，其实form组件的主要功能如下:

生成页面可用的HTML标签
对用户提交的数据进行校验
保留上次输入内容

普通方式手写注册功能

views.py

# 注册
def register(request):
    error_msg = ""
    if request.method == "POST":
        username = request.POST.get("name")
        pwd = request.POST.get("pwd")
        # 对注册信息做校验
        if len(username) < 6:
            # 用户长度小于6位
            error_msg = "用户名长度不能小于6位"
        else:
            # 将用户名和密码存到数据库
            return HttpResponse("注册成功")
    return render(request, "register.html", {"error_msg": error_msg})

login.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>注册页面</title>
</head>
<body>
<form action="/reg/" method="post">
    {% csrf_token %}
    <p>
        用户名:
        <input type="text" name="name">
    </p>
    <p>
        密码：
        <input type="password" name="pwd">
    </p>
    <p>
        <input type="submit" value="注册">
        <p style="color: red">{{ error_msg }}</p>
    </p>
</form>
</body>
</html>

使用form组件实现注册功能

views.py

先定义好一个RegForm类：

from django import forms

# 按照Django form组件的要求自己写一个类
class RegForm(forms.Form):
    name = forms.CharField(label="用户名")
    pwd = forms.CharField(label="密码")

再写一个视图函数：

# 使用form组件实现注册方式
def register2(request):
    form_obj = RegForm()
    if request.method == "POST":
        # 实例化form对象的时候，把post提交过来的数据直接传进去
        form_obj = RegForm(request.POST)
        # 调用form_obj校验数据的方法
        if form_obj.is_valid():
            return HttpResponse("注册成功")
    return render(request, "register2.html", {"form_obj": form_obj})

login2.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>注册2</title>
</head>
<body>
    <form action="/reg2/" method="post" novalidate autocomplete="off">
        {% csrf_token %}
        <div>
            <label for="{{ form_obj.name.id_for_label }}">{{ form_obj.name.label }}</label>
            {{ form_obj.name }} {{ form_obj.name.errors.0 }}
        </div>
        <div>
            <label for="{{ form_obj.pwd.id_for_label }}">{{ form_obj.pwd.label }}</label>
            {{ form_obj.pwd }} {{ form_obj.pwd.errors.0 }}
        </div>
        <div>
            <input type="submit" class="btn btn-success" value="注册">
        </div>
    </form>
</body>
</html>

看网页效果发现也验证了form的功能：
• 前端页面是form类的对象生成的 -->生成HTML标签功能
• 当用户名和密码输入为空或输错之后页面都会提示 -->用户提交校验功能
• 当用户输错之后再次输入上次的内容还保留在input框 -->保留上次输入内容

Form那些事儿

回到顶部

常用字段与插件

创建Form类时，主要涉及到【字段】和【插件】，字段用于对用户请求数据的验证，插件用于自动生成HTML;

initial

初始值，input框里面的初始值。

class LoginForm(forms.Form):
    username = forms.CharField(
        min_length=8,
        label="用户名",
        initial="张三"  # 设置默认值
    )
    pwd = forms.CharField(min_length=6, label="密码")

error_messages

重写错误信息。

class LoginForm(forms.Form):
    username = forms.CharField(
        min_length=8,
        label="用户名",
        initial="张三",
        error_messages={
            "required": "不能为空",
            "invalid": "格式错误",
            "min_length": "用户名最短8位"
        }
    )
    pwd = forms.CharField(min_length=6, label="密码")

password

class LoginForm(forms.Form):
    ...
    pwd = forms.CharField(
        min_length=6,
        label="密码",
        widget=forms.widgets.PasswordInput(attrs={'class': 'c1'}, render_value=True)
    )

radioSelect

单radio值为字符串

class LoginForm(forms.Form):
    username = forms.CharField(
        min_length=8,
        label="用户名",
        initial="张三",
        error_messages={
            "required": "不能为空",
            "invalid": "格式错误",
            "min_length": "用户名最短8位"
        }
    )
    pwd = forms.CharField(min_length=6, label="密码")
    gender = forms.fields.ChoiceField(
        choices=((1, "男"), (2, "女"), (3, "保密")),
        label="性别",
        initial=3,
        widget=forms.widgets.RadioSelect()
    )

单选Select

class LoginForm(forms.Form):
    ...
    hobby = forms.fields.ChoiceField(
        choices=((1, "篮球"), (2, "足球"), (3, "双色球"), ),
        label="爱好",
        initial=3,
        widget=forms.widgets.Select()
    )

多选Select

class LoginForm(forms.Form):
    ...
    hobby = forms.fields.MultipleChoiceField(
        choices=((1, "篮球"), (2, "足球"), (3, "双色球"), ),
        label="爱好",
        initial=[1, 3],
        widget=forms.widgets.SelectMultiple()
    )

单选checkbox

class LoginForm(forms.Form):
    ...
    keep = forms.fields.ChoiceField(
        label="是否记住密码",
        initial="checked",
        widget=forms.widgets.CheckboxInput()
    )

多选checkbox

class LoginForm(forms.Form):
    ...
    hobby = forms.fields.MultipleChoiceField(
        choices=((1, "篮球"), (2, "足球"), (3, "双色球"),),
        label="爱好",
        initial=[1, 3],
        widget=forms.widgets.CheckboxSelectMultiple()
    )

关于choice的注意事项：

在使用选择标签时，需要注意choices的选项可以从数据库中获取，但是由于是静态字段 ***获取的值无法实时更新***，那么需要自定义构造方法从而达到此目的。

方式一：

from django.forms import Form
from django.forms import widgets
from django.forms import fields

 
class MyForm(Form):
 
    user = fields.ChoiceField(
        # choices=((1, '上海'), (2, '北京'),),
        initial=2,
        widget=widgets.Select
    )
 
    def __init__(self, *args, **kwargs):
        super(MyForm,self).__init__(*args, **kwargs)
        # self.fields['user'].choices = ((1, '上海'), (2, '北京'),)
        # 或
        self.fields['user'].choices = models.Classes.objects.all().values_list('id','caption')

方式二：

from django import forms
from django.forms import fields
from django.forms import models as form_model

 
class FInfo(forms.Form):
    authors = form_model.ModelMultipleChoiceField(queryset=models.NNewType.objects.all())  # 多选
    # authors = form_model.ModelChoiceField(queryset=models.NNewType.objects.all())  # 单选

Django Form所有内置字段

Field
    required=True,               是否允许为空
    widget=None,                 HTML插件
    label=None,                  用于生成Label标签或显示内容
    initial=None,                初始值
    help_text='',                帮助信息(在标签旁边显示)
    error_messages=None,         错误信息 {'required': '不能为空', 'invalid': '格式错误'}
    validators=[],               自定义验证规则
    localize=False,              是否支持本地化
    disabled=False,              是否可以编辑
    label_suffix=None            Label内容后缀
 
 
CharField(Field)
    max_length=None,             最大长度
    min_length=None,             最小长度
    strip=True                   是否移除用户输入空白
 
IntegerField(Field)
    max_value=None,              最大值
    min_value=None,              最小值
 
FloatField(IntegerField)
    ...
 
DecimalField(IntegerField)
    max_value=None,              最大值
    min_value=None,              最小值
    max_digits=None,             总长度
    decimal_places=None,         小数位长度
 
BaseTemporalField(Field)
    input_formats=None          时间格式化   
 
DateField(BaseTemporalField)    格式：2015-09-01
TimeField(BaseTemporalField)    格式：11:12
DateTimeField(BaseTemporalField)格式：2015-09-01 11:12
 
DurationField(Field)            时间间隔：%d %H:%M:%S.%f
    ...
 
RegexField(CharField)
    regex,                      自定制正则表达式
    max_length=None,            最大长度
    min_length=None,            最小长度
    error_message=None,         忽略，错误信息使用 error_messages={'invalid': '...'}
 
EmailField(CharField)      
    ...
 
FileField(Field)
    allow_empty_file=False     是否允许空文件
 
ImageField(FileField)      
    ...
    注：需要PIL模块，pip3 install Pillow
    以上两个字典使用时，需要注意两点：
        - form表单中 enctype="multipart/form-data"
        - view函数中 obj = MyForm(request.POST, request.FILES)
 
URLField(Field)
    ...
 
 
BooleanField(Field)  
    ...
 
NullBooleanField(BooleanField)
    ...
 
ChoiceField(Field)
    ...
    choices=(),                选项，如：choices = ((0,'上海'),(1,'北京'),)
    required=True,             是否必填
    widget=None,               插件，默认select插件
    label=None,                Label内容
    initial=None,              初始值
    help_text='',              帮助提示
 
 
ModelChoiceField(ChoiceField)
    ...                        django.forms.models.ModelChoiceField
    queryset,                  # 查询数据库中的数据
    empty_label="---------",   # 默认空显示内容
    to_field_name=None,        # HTML中value的值对应的字段
    limit_choices_to=None      # ModelForm中对queryset二次筛选
     
ModelMultipleChoiceField(ModelChoiceField)
    ...                        django.forms.models.ModelMultipleChoiceField
 
 
     
TypedChoiceField(ChoiceField)
    coerce = lambda val: val   对选中的值进行一次转换
    empty_value= ''            空值的默认值
 
MultipleChoiceField(ChoiceField)
    ...
 
TypedMultipleChoiceField(MultipleChoiceField)
    coerce = lambda val: val   对选中的每一个值进行一次转换
    empty_value= ''            空值的默认值
 
ComboField(Field)
    fields=()                  使用多个验证，如下：即验证最大长度20，又验证邮箱格式
                               fields.ComboField(fields=[fields.CharField(max_length=20), fields.EmailField(),])
 
MultiValueField(Field)
    PS: 抽象类，子类中可以实现聚合多个字典去匹配一个值，要配合MultiWidget使用
 
SplitDateTimeField(MultiValueField)
    input_date_formats=None,   格式列表：['%Y--%m--%d', '%m%d/%Y', '%m/%d/%y']
    input_time_formats=None    格式列表：['%H:%M:%S', '%H:%M:%S.%f', '%H:%M']
 
FilePathField(ChoiceField)     文件选项，目录下文件显示在页面中
    path,                      文件夹路径
    match=None,                正则匹配
    recursive=False,           递归下面的文件夹
    allow_files=True,          允许文件
    allow_folders=False,       允许文件夹
    required=True,
    widget=None,
    label=None,
    initial=None,
    help_text=''
 
GenericIPAddressField
    protocol='both',           both,ipv4,ipv6支持的IP格式
    unpack_ipv4=False          解析ipv4地址，如果是::ffff:192.0.2.1时候，可解析为192.0.2.1， PS：protocol必须为both才能启用
 
SlugField(CharField)           数字，字母，下划线，减号（连字符）
    ...
 
UUIDField(CharField)           uuid类型

Django Form内置字段

校验

方式一：

from django.forms import Form
from django.forms import widgets
from django.forms import fields
from django.core.validators import RegexValidator
 
class MyForm(Form):
    user = fields.CharField(
        validators=[RegexValidator(r'^[0-9]+$', '请输入数字'), RegexValidator(r'^159[0-9]+$', '数字必须以159开头')],
    )

方式二：

import re
from django.forms import Form
from django.forms import widgets
from django.forms import fields
from django.core.exceptions import ValidationError
 
 
# 自定义验证规则
def mobile_validate(value):
    mobile_re = re.compile(r'^(13[0-9]|15[012356789]|17[678]|18[0-9]|14[57])[0-9]{8}$')
    if not mobile_re.match(value):
        raise ValidationError('手机号码格式错误')
 
 
class PublishForm(Form):
 
 
    title = fields.CharField(max_length=20,
                            min_length=5,
                            error_messages={'required': '标题不能为空',
                                            'min_length': '标题最少为5个字符',
                                            'max_length': '标题最多为20个字符'},
                            widget=widgets.TextInput(attrs={'class': "form-control",
                                                          'placeholder': '标题5-20个字符'}))
 
 
    # 使用自定义验证规则
    phone = fields.CharField(validators=[mobile_validate, ],
                            error_messages={'required': '手机不能为空'},
                            widget=widgets.TextInput(attrs={'class': "form-control",
                                                          'placeholder': u'手机号码'}))
 
    email = fields.EmailField(required=False,
                            error_messages={'required': u'邮箱不能为空','invalid': u'邮箱格式错误'},
                            widget=widgets.TextInput(attrs={'class': "form-control", 'placeholder': u'邮箱'}))

补充进阶

应用Bootstrap样式

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="x-ua-compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="/static/bootstrap/css/bootstrap.min.css">
  <title>login</title>
</head>
<body>
<div class="container">
  <div class="row">
    <form action="/login2/" method="post" novalidate class="form-horizontal">
      {% csrf_token %}
      <div class="form-group">
        <label for="{{ form_obj.username.id_for_label }}"
               class="col-md-2 control-label">{{ form_obj.username.label }}</label>
        <div class="col-md-10">
          {{ form_obj.username }}
          <span class="help-block">{{ form_obj.username.errors.0 }}</span>
        </div>
      </div>
      <div class="form-group">
        <label for="{{ form_obj.pwd.id_for_label }}" class="col-md-2 control-label">{{ form_obj.pwd.label }}</label>
        <div class="col-md-10">
          {{ form_obj.pwd }}
          <span class="help-block">{{ form_obj.pwd.errors.0 }}</span>
        </div>
      </div>
      <div class="form-group">
      <label class="col-md-2 control-label">{{ form_obj.gender.label }}</label>
        <div class="col-md-10">
          <div class="radio">
            {% for radio in form_obj.gender %}
              <label for="{{ radio.id_for_label }}">
                {{ radio.tag }}{{ radio.choice_label }}
              </label>
            {% endfor %}
          </div>
        </div>
      </div>
      <div class="form-group">
        <div class="col-md-offset-2 col-md-10">
          <button type="submit" class="btn btn-default">注册</button>
        </div>
      </div>
    </form>
  </div>
</div>

<script src="/static/jquery-3.2.1.min.js"></script>
<script src="/static/bootstrap/js/bootstrap.min.js"></script>
</body>
</html>

Django form应用Bootstrap样式简单示例

批量添加样式

可通过重写form类的init方法来实现。

class LoginForm(forms.Form):
    username = forms.CharField(
        min_length=8,
        label="用户名",
        initial="张三",
        error_messages={
            "required": "不能为空",
            "invalid": "格式错误",
            "min_length": "用户名最短8位"
        }
    ...

    def __init__(self, *args, **kwargs):
        super(LoginForm, self).__init__(*args, **kwargs)
        for field in iter(self.fields):
            self.fields[field].widget.attrs.update({
                'class': 'form-control'
            })

批量添加样式

批量添加样式

ModelForm

form与model的终极结合。

class BookForm(forms.ModelForm):

    class Meta:
        model = models.Book
        fields = "__all__"
        labels = {
            "title": "书名",
            "price": "价格"
        }
        widgets = {
            "password": forms.widgets.PasswordInput(attrs={"class": "c1"}),
        }

class Meta:下常用参数：

model = models.Student  # 对应的Model中的类
fields = "__all__"  # 字段，如果是__all__,就是表示列出所有的字段
exclude = None  # 排除的字段
labels = None  # 提示信息
help_texts = None  # 帮助提示信息
widgets = None  # 自定义插件
error_messages = None  # 自定义错误信息

普通方式手写注册功能:

1,自己写html代码,2,对提交的数据进行校验,3,有错误信息的提示

urls.py:

 url(r'^reg/',views.register),  #注册

views.py:

def register(request):    #注册
    err_msg = ''
    if request.method == 'POST':
        username = request.POST.get('username')
        pwd = request.POST.get('pwd')
        if len(username) < 5:
            err_msg = '太短了'
        else:
            # 存数据库
            return HttpResponse('注册成功')
    return render(request, 'reg.html', {'err_msg': err_msg})

View Code

reg.html:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="x-ua-compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>注册页面</title>
</head>
<body>
<form action="" method="post">
    {% csrf_token %}
    <p>
        用户名：
        <input type="text" name="username"><span style="color: red">{{ err_msg }}</span>
    </p>
    <p>
        密码：
        <input type="password" name="pwd">
    </p>
    <p>
        <button type="submit">提交</button>
    </p>
</form>

</body>
</html>

View Code

2,使用django的from组件实现功能:

写类,并导入类

urls.py:

url(r'^reg2/',views.register2),

View Code

forms.py写类:

from django import forms
from django.forms import widgets
from app01 import models
from django.core.validators import RegexValidator
from django.core.exceptions import ValidationError

# 定义form
class RegForm(forms.Form):
    username = forms.CharField(
        min_length=5,
        max_length=10,
        label='用户名',
        initial='长度不小于5',
        # validators=[check,]
        error_messages={
            'min_length': '你的长度太短了',
            'required': '不能为空',
        }, widget=widgets.TextInput(attrs={'class': 'form-control'})
    )
    pwd = forms.CharField(
        label='密码',
        min_length=4,
        required=False,
        widget=widgets.PasswordInput(attrs={'class': 'form-control'}))

    re_pwd = forms.CharField(
        label='确认密码',
        min_length=4,
        widget=widgets.PasswordInput(attrs={'class': 'form-control'}))

View Code

views.py:

from app01.forms import RegForm

def register2(request):
    form_obj = RegForm()

    if request.method == 'POST':
        # print(request.POST)
        form_obj= RegForm(request.POST)
        if form_obj.is_valid():

            # print(form_obj.cleaned_data)
            return HttpResponse('注册成功')

    return render(request, 'reg2.html', {'form_obj': form_obj})

View Code

reg2.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="x-ua-compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>注册页面</title>
</head>
<body>
<form action="" method="post">
    {% csrf_token %}
    <p>
        用户名：
        <input type="text" name="username"><span style="color: red">{{ err_msg }}</span>
    </p>
    <p>
        密码：
        <input type="password" name="pwd">
    </p>
    <p>
        <button type="submit">提交</button>
    </p>
</form>

</body>
</html>

View Code

简写,reg2.html:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="x-ua-compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>注册页面</title>
</head>
<body>
<form action="" method="post" novalidate="">
    {% csrf_token %}
    {{form_obj.as_p}}
    
    <p>
        <button type="submit">提交</button>
    </p>
    {{form_obj.errors}}
</form>

</body>
</html>

View Code

reg2.html样式修改

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="x-ua-compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>Title</title>
    <link href="/static/bootstrap-3.3.7/css/bootstrap.css" rel="stylesheet">
</head>
<body>
<div class="container">

    <div class="col-lg-6 col-lg-offset-3" style="margin-top: 30px">
        <form action="" method="post" novalidate class="form-horizontal">
            {% csrf_token %}
            <div class="form-group {% if form_obj.username.errors %}has-error{% endif %}">
                <label for="{{ form_obj.username.id_for_label }}" class="col-sm-2 control-label">
                    {{ form_obj.username.label }}</label>
                <div class="col-sm-10">
                    {{ form_obj.username }}
                    <span class="help-block">{{ form_obj.username.errors.0 }}</span>
                </div>
            </div>

            <div class="form-group {% if form_obj.username.errors %}has-error{% endif %}">
                <label for="{{ form_obj.pwd.id_for_label }}" class="col-sm-2 control-label">
                    {{ form_obj.pwd.label }}</label>
                <div class="col-sm-10">
                    {{ form_obj.pwd }}
                    <span class="help-block">{{ form_obj.pwd.errors.0 }}</span>
                </div>
            </div>
            <div class="form-group {% if form_obj.username.errors %}has-error{% endif %}">
                <label for="{{ form_obj.re_pwd.id_for_label }}" class="col-sm-2 control-label">
                    {{ form_obj.re_pwd.label }}</label>
                <div class="col-sm-10">
                    {{ form_obj.re_pwd }}
                    <span class="help-block">{{ form_obj.re_pwd.errors.0 }}</span>
                </div>
            </div>
            {#                <div class="form-group">#}
            {#                    <label for="{{ form_obj.phone.id_for_label }}" class="col-sm-2 control-label">#}
            {#                        {{ form_obj.phone.label }}</label>#}
            {#                    <div class="col-sm-10">#}
            {#                        {{ form_obj.phone }}#}
            {#                    </div>#}
            {#                </div>#}


            {#                <div class="form-group">#}
            {#                    <label for="{{ form_obj.gender.id_for_label }}" class="col-sm-2 control-label">#}
            {#                        {{ form_obj.gender.label }}</label>#}
            {#                    <div class="col-sm-10">#}
            {#                        {{ form_obj.gender }}#}
            {#                    </div>#}
            {#                </div>#}
            {#                <div class="form-group">#}
            {#                    <label for="{{ form_obj.hobby.id_for_label }}" class="col-sm-2 control-label">#}
            {#                        {{ form_obj.hobby.label }}</label>#}
            {#                    <div class="col-sm-10">#}
            {#                        {{ form_obj.hobby }}#}
            {#                    </div>#}
            {#                </div>#}
            {##}
            {#                <div class="form-group">#}
            {#                    <label for="{{ form_obj.hobby2.id_for_label }}" class="col-sm-2 control-label">#}
            {#                        {{ form_obj.hobby2.label }}</label>#}
            {#                    <div class="col-sm-10">#}
            {#                        {{ form_obj.hobby2 }}#}
            {#                    </div>#}
            {#                </div>#}


            <p>
                <button type="submit">提交</button>
            </p>

        </form>
    </div>
    <script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.min.js"></script>
    <script>
        $("input").focus(function () {
            $(this).next().text("").parent().parent().removeClass('has-error')
        })
    </script>
</div>
</body>
</html>

View Code

ajax登录上传,注册等:

urls.py:

from django.conf.urls import url
from django.contrib import admin
from app01 import views
urlpatterns = [
    url(r'^admin/', admin.site.urls),
    url(r'^index/', views.index),
    url(r'^calc/', views.calc),
    url(r'^ajax_test/', views.ajax_test),
    url(r'^ajax_file/', views.ajax_file),
    url(r'^form_file/', views.form_file),

    url(r'^reg/', views.reg),
    url(r'^login/', views.login),

]

View Code

views.py:

from django.shortcuts import render, HttpResponse,redirect
import json
from django.http import JsonResponse

from django.middleware.csrf import CsrfViewMiddleware
from django.conf import global_settings
from django.views.decorators.csrf import ensure_csrf_cookie
from app01 import models


@ensure_csrf_cookie
def index(request):
    res, l1, l2 = '', '', ''
    if request.method == 'POST':
        l1 = int(request.POST.get('i1'))
        l2 = int(request.POST.get('i2'))

        res = l1 + l2

    return render(request, 'index.html', {'res': res, 'l1': l1, 'l2': l2})


def calc(request):
    l1 = int(request.POST.get('i1'))
    l2 = int(request.POST.get('i2'))

    res = l1 + l2
    return HttpResponse(res)
    # return render(request, 'index.html')\


def ajax_test(request):
    print(request.POST)
    print(request.POST.get('name'))
    print(request.POST.get('hobby'), type(request.POST.get('hobby')))
    d = {'status': 0, 'msg': ''}

    # return HttpResponse(json.dumps(d))
    return JsonResponse(d)


def form_file(request):
    if request.method == 'POST':
        file_obj = request.FILES.get('file')
        with open(file_obj.name, 'wb') as f:
            for i in file_obj.chunks():
                f.write(i)
        return HttpResponse('上传成功')

    return render(request, 'form_file.html')


def ajax_file(request):
    file_obj = request.FILES.get('f1')
    with open(file_obj.name, 'wb') as f:
        for i in file_obj.chunks():
            f.write(i)
    return HttpResponse('上传成功')


def reg(request):
    ret = {'status': 0, 'msg': ''}
    if request.is_ajax():
        name = request.POST.get('username')
        is_exist = models.UserInfo.objects.filter(username=name)
        if is_exist:
            ret['msg'] = '用户名已存在'
            ret['status'] = 1
        else:
            ret['msg'] = '用户名可以使用'
        return JsonResponse(ret)
    return render(request, 'reg.html')


def login(request):
    ret = {'status': 0, 'msg': ''}
    if request.method == 'POST':
        username = request.POST.get('username')
        pwd = request.POST.get('pwd')
        if username == 'alex' and pwd == "alexdsb":
            ret['url'] ='/index/'
        else:
            ret['status'] = 1
            ret['msg'] ='用户名或密码错误'
        return JsonResponse(ret)
    return render(request, 'login.html')

View Code

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="x-ua-compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>Title</title>
</head>
<body>
<p>
    用户名：
    <input type="text" id="i1">
</p>
<p>
    密码：
    <input type="password" id="i2">
</p>
<p>
    <button id="b1">登录</button>
</p>
<script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.js"></script>
<script src="/static/ajax_setup.js"></script>

<script>
    $("#b1").click(function () {
          $.ajax({
            url: '/login/',
            type: 'post',
            data: {
                'username': $("#i1").val(),
                'pwd': $("#i2").val()
            },
            success: function (res) {
                if (res.status == 0 ){
                    location.href = res.url
                }
            }
        })
    })

</script>
</body>
</html>

View Code

reg.html:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="x-ua-compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>Title</title>
</head>
<body>
<input type="text" id="i1"><span style="color: red"></span>
<button id="b1">点击</button>
<script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.js"></script>
<script src="/static/ajax_setup.js"></script>
<script>
    $("#i1").blur(function () {
        var _this = $(this);
        $.ajax({
            url: '/reg/',
            type: 'post',
            data: {'username': $("#i1").val()},
            success: function (res) {
                console.log(res);

                if (res.status != 0) {
                    _this.next().text(res.msg);
                }
            }
        })
    });
    $("#i1").focus(function () {
        $(this).next().text('')
    })

</script>
</body>
</html>

View Code

from_file.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="x-ua-compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>Title</title>
</head>
<body>
<form action="" method="post" enctype="multipart/form-data">
{#<form action="" method="post" enctype="application/x-www-form-urlencoded">#}
    {% csrf_token %}
    <input type="file" name="file">
    <button>上传</button>
</form>

<hr>
<h2>ajax上传文件</h2>
<input type="file" name="file" id="f1">
<button id="b1">上传</button>


<script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.js"></script>
<script>
    $("#b1").click(function () {
        var formData = new FormData();
        formData.append("csrfmiddlewaretoken", $("[name='csrfmiddlewaretoken']").val());
        formData.append("f1", $("#f1")[0].files[0]);
        $.ajax({
            url: "/ajax_file/",
            type: "POST",
            processData: false,  // 告诉jQuery不要去处理发送的数据
            contentType: false,  // 告诉jQuery不要去设置Content-Type请求头
            data: formData,
            success: function (data) {
                console.log(data)
            }
        })

    })

</script>
</body>
</html>

View Code

index.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="x-ua-compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>Title</title>
</head>
<body>
{#{% csrf_token %}#}
<form action="" method="post">
    <input type="text" name="i1" value="{{ l1 }}">+
    <input type="text" name="i2" value="{{ l2 }}">=
    <input type="text" name="i3" value="{{ res }}">
    <button type="submit">计算</button>
</form>

<h2>ajax提交</h2>
<input type="text" id="i1">+
<input type="text" id="i2">=
<input type="text" id="i3">
<button type="submit" id="b1">计算</button>


<hr>
<button id="test">参数测试</button>
<script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.js"></script>
<script src="/static/ajax_setup.js"></script>
<script>


    $("#b1").click(function () {
        var i1 = $("#i1").val();
        var i2 = $("#i2").val();

        $.ajax({
            url: '/calc/',
            type: 'post',
            {#headers: {"X-CSRFToken":$("[name='csrfmiddlewaretoken']").val()},#}
            data: {
                'i1': i1,
                'i2': i2
            },
            success: function (res) {
                console.log(res);
                $("#i3").val(res);
            },
        })
    });

    $("#test").click(function () {
         $.ajax({
            url: '/ajax_test/',
            type: 'post',
            data: {
                {#'csrfmiddlewaretoken':$("[name='csrfmiddlewaretoken']").val(),#}
                'name': 'alex',
                'hobby': JSON.stringify(['抽烟','喝酒','烫头']),
                {#'hobby': ['抽烟','喝酒','烫头']#}
            },
            success: function (res) {
                {#res = JSON.parse(res)#}
                console.log(res)

            },
        })
    })

</script>

</body>
</html>

View Code

来源：https://www.cnblogs.com/ls13691357174/p/9680516.html

标签

form

form表单提交

pwd

form 组件

Form介绍

普通方式手写注册功能

views.py

login.html

使用form组件实现注册功能

views.py

login2.html

Form那些事儿

常用字段与插件

initial

error_messages

password

radioSelect

单选Select

多选Select

单选checkbox

多选checkbox

Django Form所有内置字段

校验

补充进阶

应用Bootstrap样式

批量添加样式

ModelForm