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Django forms组件

校验字段

模板文件

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<form action="" method="post">

    <p>用户名: <input type="text" name="name"></p>
{#    <p>密码: <input type="text" name="pwd"></p>#}
    <p>确认密码: <input type="text" name="re_pwd"></p>
    <p>邮箱: <input type="text" name="email"></p>
    <input type="submit" value="提交">

</form>
</body>
</html>

视图文件

from django import forms
from django.forms import widgets

class MyForm(forms.Form):
    # 定义一个属性,可以用来校验字符串类型
    # 限制最大长度是8,最小长度是3
    name = forms.CharField(max_length=8, min_length=3, label='用户名',
                           error_messages={'max_length': '最长是8', 'min_length': '最短是3', 'required': '这个必须填'},)
    pwd = forms.CharField(max_length=8, min_length=3, required=True, label='密码',
                          error_messages={'max_length': '最长是8', 'min_length': '最短是3', 'required': '这个必须填'},)
    re_pwd = forms.CharField(max_length=8, min_length=3, required=True, label='确认密码',
                          error_messages={'max_length': '最长是8', 'min_length': '最短是3', 'required': '这个必须填'},)
    # 校验是否是邮箱格式
    email = forms.EmailField(label='邮箱', error_messages={'required': '这个必须填', 'invalid': '不符合邮箱格式'})

数据从前端传过来,校验
要校验的字典,可以多参数,但是不能少
def index_form(request):
    # 生成对象时(实例化),需要传入要校验的数据(字典)
    if request.method=='GET':
        return render(request,'indxe.html')
    elif request.method=='POST':
        print(request.POST)
        myform=MyForm(request.POST)
        # is_valid如果是true表示校验成功,反之,校验失败
        if myform.is_valid():
            # 校验通过的数据
            print(myform.cleaned_data)
            return HttpResponse('校验成功')
        else:
            print(myform.cleaned_data)
            # 错误信息,它是一个字典
            print(myform.errors)
            print(myform.errors.as_data())
            print(type(myform.errors))
         from django.forms.utils import ErrorDict
            return HttpResponse('校验失败')

渲染模板

视图文件

from django.forms import widgets
from django.forms import widgets
from django.core.exceptions import ValidationError

 name = forms.CharField(widget=widgets.TextInput(attrs={'class': 'form-control'}))
 pwd = forms.CharField(widget=widgets.PasswordInput(attrs={'class': 'form-control'}))

widgets 就是用来渲染的

class MyForm(forms.Form):
    # 定义一个属性,可以用来校验字符串类型
    # 限制最大长度是8,最小长度是3
    name = forms.CharField(max_length=8, min_length=3, label='用户名',
                           error_messages={'max_length': '最长是8', 'min_length': '最短是3', 'required': '这个必须填'},
                           widget=widgets.TextInput(attrs={'class': 'form-control'}))
    pwd = forms.CharField(max_length=8, min_length=3, required=True, label='密码',
                          error_messages={'max_length': '最长是8', 'min_length': '最短是3', 'required': '这个必须填'},
                          widget=widgets.PasswordInput())
    re_pwd = forms.CharField(max_length=8, min_length=3, required=True, label='确认密码',
                          error_messages={'max_length': '最长是8', 'min_length': '最短是3', 'required': '这个必须填'},
                          widget=widgets.PasswordInput())
    # 校验是否是邮箱格式
    email = forms.EmailField(label='邮箱', error_messages={'required': '这个必须填', 'invalid': '不符合邮箱格式'})


渲染模板
def index_form(request):
    # 生成对象时(实例化),需要传入要校验的数据(字典)
    myform=MyForm()
    if request.method=='GET':
        return render(request,'indxe2.html',locals())

模板文件

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<hr>
<h1>第一种方式</h1>
<form action="" method="post" >
    <p>用户名: {{ myform.name }}</p>
    <p>密码: {{ myform.pwd }}</p>
    <p>邮箱: {{ myform.email }}</p>
    <input type="submit" value="提交">

</form>
<hr>
<h1>第二种方式(for循环form对象,建议用这种)</h1>
<form action="" method="post" >
    {% for foo in myform %}
        <p>{{ foo.label }}:{{ foo }}</p>
    {% endfor %}

    <input type="submit" value="提交">
</form>
<h1>第三种方式(不建议用)</h1>
<form action="" method="post" >

{#    {{ myform.as_p }}#}
    {{ myform.as_ul }}
    <input type="submit" value="提交">
</form>
</body>
</html>

渲染错误信息

视图文件

# 第一步:先要继承Form
from django import forms
from django.forms import widgets
from django.core.exceptions import ValidationError


# 写一个类
class MyForm(forms.Form):
    # 定义一个属性,可以用来校验字符串类型
    # 限制最大长度是8,最小长度是3
    name = forms.CharField(max_length=8, min_length=3, label='用户名',
                           error_messages={'max_length': '最长是8', 'min_length': '最短是3', 'required': '这个必须填'},
                           widget=widgets.TextInput(attrs={'class': 'form-control'}))
    pwd = forms.CharField(max_length=8, min_length=3, required=True, label='密码',
                          error_messages={'max_length': '最长是8', 'min_length': '最短是3', 'required': '这个必须填'},
                          widget=widgets.PasswordInput())
    re_pwd = forms.CharField(max_length=8, min_length=3, required=True, label='确认密码',
                          error_messages={'max_length': '最长是8', 'min_length': '最短是3', 'required': '这个必须填'},
                          widget=widgets.PasswordInput())
    # 校验是否是邮箱格式
    email = forms.EmailField(label='邮箱', error_messages={'required': '这个必须填', 'invalid': '不符合邮箱格式'})

    # aa = forms.CharField(label='选择', error_messages={'required': '这个必须填', 'invalid': '不符合邮箱格式'},widget=widgets.CheckboxInput())
    def clean_name(self):
        # self:当前form对象
        name = self.cleaned_data.get('name')
        if name.startswith('sb'):
            # 失败,抛异常
            raise ValidationError('不能以傻逼开头')
        # 正常,把name返回
        return name

    def clean(self):
        pwd=self.cleaned_data.get('pwd')
        re_pwd=self.cleaned_data.get('re_pwd')
        if pwd==re_pwd:
            return self.cleaned_data
        else:
            raise ValidationError('两次密码不一致')


# 渲染错误信息
from app01 import models
def index_form(request):
    # 生成对象时(实例化),需要传入要校验的数据(字典)
    if request.method == 'GET':
        myform = MyForm()
    elif request.method == 'POST':
        myform = MyForm(request.POST)
        if myform.is_valid():
            print(myform.cleaned_data)

            myform.cleaned_data.pop('re_pwd')
            models.User.objects.create(**myform.cleaned_data)
            return redirect('http://www.baidu.com')
        else:
            all_error = myform.errors.get('__all__')
            if all_error:
                all_error=all_error[0]

    return render(request, 'indxe3.html', locals())

模板文件

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <link rel="stylesheet" href="/static/bootstrap-3.3.7-dist/css/bootstrap.min.css">
    <title>Title</title>
</head>
<body>

<h1>第二种方式(for循环form对象,建议用这种)</h1>
<form action="" method="post" novalidate>
    {% for foo in myform %}
        <p>{{ foo.label }}:{{ foo }} <span>{{ foo.errors.0 }}</span></p>
    {% endfor %}

    <input type="submit" value="提交"><span>{{ all_error }}</span>
</form>
</body>
</html>

errors存放着错误信息

局部钩子

    def clean_name(self):
        # self:当前form对象
        name = self.cleaned_data.get('name')
        if name.startswith('sb'):
            # 失败,抛异常
            raise ValidationError('不能以傻逼开头')
        # 正常,把name返回
        return name

clean_name  是拿上面定义的name 返回的信息也是放到 errors字典内 键是name 对应的值内

全局钩子

    def clean(self):
        pwd=self.cleaned_data.get('pwd')
        re_pwd=self.cleaned_data.get('re_pwd')
        if pwd==re_pwd:
            return self.cleaned_data
        else:
            raise ValidationError('两次密码不一致')

全局钩子  错误的信息存放在 errors 字典内的 __all__ 键对应的值内

from django.shortcuts import render,HttpResponse
import json
from django.http import JsonResponse
# Create your views here.
from django import forms
from django.forms import widgets
from django.core.exceptions import ValidationError
from app01 import models


class myForm(forms.Form):
    name = forms.CharField(max_length=12, min_length=3, label='用户名',
                           error_messages={'max_length': '最长是12', 'min_length': '最短是3', 'required': '必填'},
                           widget=widgets.TextInput(attrs={'class': 'form-control','id':'usr'}))
    pwd = forms.CharField(max_length=16, min_length=3, label='密码',
                          error_messages={'max_length': '最长16', 'min_length': '最短是3', 'required': '必填'},
                          widget=widgets.PasswordInput(attrs={'class': 'form-control','id':'pwd'}))
    re_pwd = forms.CharField(max_length=16, min_length=3, label='再次输入密码',
                             error_messages={'max_length': '最长16', 'min_length': '最短是3', 'required': '必填'},
                             widget=widgets.PasswordInput(attrs={'class': 'form-control','id':'pwd2'}))
    email = forms.EmailField(label='邮箱',
                             error_messages={'required': '必填', 'invalid': '不符合邮箱格式'},
                             widget=widgets.EmailInput(attrs={'class': 'form-control','id':'email'}))

    def clean_name(self):
        name=self.cleaned_data.get("name")
        # print(name)
        account=models.User.objects.filter(name=name).first()
        if account:
            raise ValidationError('该用户名已存在')
        return name

    def clean(self):
        pwd = self.cleaned_data.get('pwd')
        # print(pwd)
        re_pwd = self.cleaned_data.get('re_pwd')
        if pwd == re_pwd:
            return self.cleaned_data
        else:
            raise ValidationError('两次密码不一致')


def index(request):
    if request.method == 'GET':
        myform = myForm()
        return render(request, 'index.html', locals())
    elif request.method == 'POST':
        # print(request.POST)
        # print(request.body)
        ajax1=json.loads(request.body.decode('utf-8'))
        # print(ajax1)
        myform = myForm(ajax1)
        if myform.is_valid():
            data = myform.cleaned_data
            data.pop('re_pwd')
            models.User.objects.create(**data)
            return HttpResponse('注册成功')
        else:
            return JsonResponse(myform.errors)

def index_usr(request):
    print(request.body)
    ajax2 = json.loads(request.body.decode('utf-8'))
    print(ajax2)
    myform = myForm(ajax2)
    if myform.is_valid():
        return HttpResponse(json.dumps('可以使用的用户名'))
    else:
        return JsonResponse(myform.errors)

注册功能页面（手撸）views层

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <link rel="stylesheet" href="/static/bootstrap-3.3.7-dist/css/bootstrap.css">
    <title>Title</title>
</head>
<body>
<div class="container-fluid">
    <div class="row">
        <div class="col-md-6 col-md-offset-3" id="msg">
            <form action="" method="post" novalidate>
                {% for foo in myform %}
                    <p id="{{ foo.auto_id }}">{{ foo.label }}:{{ foo }}</p>
                {% endfor %}

            </form>
            <button type="submit" id="btn">注册</button>
            <span id="error"></span>
        </div>
    </div>
</div>

</body>
<script src="/static/jquery-3.3.1.js"></script>
<script src="/static/bootstrap-3.3.7-dist/js/bootstrap.js"></script>
<script>
    $('#btn').click(function () {
        var pos_data = {
            'name': $('#usr').val(),
            'pwd': $('#pwd').val(),
            're_pwd': $('#pwd2').val(),
            'email': $('#email').val()
        };
        var pos = JSON.stringify(pos_data);
        $.ajax({
            url: '/index/',
            type: 'post',
            data: pos,
            contentType: 'application/json',
            dataType: 'json',
            success: function (data) {
                for (let i in data) {
                    var error_msg2 = $('<span class="pull-right" style="color: red" id="msg_error" >' + data[i] + '</span>');
                    if (error_msg2) {
                        $('#msg_error').remove()
                    }
                    $('#id_' + i + '').append(error_msg2);
                    if (data['__all__']) {
                        var error_msg = $('<span class="pull-right" style="color: red" id="er_pwd2">' + data['__all__'] + '</span>');
                        if ($('#er_pwd2')) {
                            $('#msg_error').remove()
                            $('#er_pwd2').remove()
                        }
                        $('#id_re_pwd').append(error_msg)
                    } else {
                        $('#er_pwd2').remove()
                    }
                    break;
                }
                alert(data)
            }
        })
    });
    $('#usr').on('blur', function () {
        var pos_data2 = {
            'name': $('#usr').val(),
        };
        var pos2 = JSON.stringify(pos_data2);
        $.ajax({
            url: '/index_usr/',
            type: 'post',
            data: pos2,
            contentType: 'application/json',
            dataType: 'json',
            success: function (data) {
                console.log(data)
                li='name'
                if (li in data) {
                    var error_msg2 = $('<span class="pull-right" style="color: red" id="msg_error" >' + data['name'] + '</span>');
                    if (error_msg2) {
                        $('#msg_error').remove()
                    }
                    $('#id_name').append(error_msg2);
                }else {
                    var error_msg2 = $('<span class="pull-right" style="color: red" id="msg_error" >可以使用的用户名 </span>');
                    if (error_msg2) {
                        $('#msg_error').remove()
                    }
                    $('#id_name').append(error_msg2);
                }
            }
        })
    })
</script>
</html>

注册功能页面(手撸) index.html

from django.db import models

# Create your models here.
class User(models.Model):
    name=models.CharField(max_length=32)
    pwd=models.CharField(max_length=32)
    email=models.EmailField()

models.py

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原文地址：https://www.cnblogs.com/layerluo/p/9998524.html