zoukankan html css js c++ java

forms组件

1 校验字段功能

针对一个实例：注册用户讲解。

模型：models.py

class UserInfo(models.Model):
    name=models.CharField(max_length=32)
    pwd=models.CharField(max_length=32)
    email=models.EmailField(模版文件

模板文件

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>

</head>
<body>

<form action="" method="post">
    {% csrf_token %}
    <div>
        <label for="user">用户名</label>
        <p>
        	<input type="text" name="name" id="name">
        </p>
    </div>
    <div>
        <label for="pwd">
        	密码
        </label>
        <p>
        	<input type="password" name="pwd" id="pwd">
        </p>
    </div>
    <div>
        <label for="r_pwd">
        	确认密码
        </label>
        <p>
        	<input type="password" name="r_pwd" id="r_pwd">
        </p>
    </div>
     <div>
        <label for="email">邮箱</label>
        <p>
        	<input type="text" name="email" id="email">
        </p>
    </div>
    <input type="submit">
</form>

</body>
</html>

视图函数：

# forms组件
from django.forms import widgets

wid_01=widgets.TextInput(attrs={"class":"form-control"})
wid_02=widgets.PasswordInput(attrs={"class":"form-control"})

class UserForm(forms.Form):
    name=forms.CharField(max_length=32,
                         widget=wid_01
                         )

    pwd=forms.CharField(max_length=32,widget=wid_02)
    r_pwd=forms.CharField(max_length=32,widget=wid_02)
    email=forms.EmailField(widget=wid_01)
    tel=forms.CharField(max_length=32,widget=wid_01)



def register(request):

    if request.method=="POST":
        form=UserForm(request.POST)
        if form.is_valid():
            print(form.cleaned_data) # 所有干净的字段以及对应的值
        else:
            print(form.cleaned_data) #
            print(form.errors) # ErrorDict : 
            			# {"校验错误的字段":["错误信息",]}
            print(form.errors.get("name")) # ErrorList ["错误信息",]
        return HttpResponse("OK")
    form=UserForm()
    return render(request,"register.html",locals())

2 渲染标签功能

渲染方式1

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
   <!-- 最新版本的 Bootstrap 核心 CSS 文件 -->
    <link rel="stylesheet" href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">
</head>
<body>
<h3>注册页面</h3>
<div class="container">
    <div class="row">
        <div class="col-md-6 col-lg-offset-3">
                <form action="" method="post">
                    {% csrf_token %}
                    <div>
                        <label for="">用户名</label>
                        {{ form.name }}
                    </div>
                    <div>
                        <label for="">密码</label>
                        {{ form.pwd }}
                    </div>
                    <div>
                        <label for="">确认密码</label>
                        {{ form.r_pwd }}
                    </div>
                    <div>
                        <label for=""> 邮箱</label>
                        {{ form.email }}
                    </div>
                    <input type="submit" class="btn btn-default pull-right">
                </form>
        </div>
    </div>
</div>
</body>
</html>

渲染方式2

<form action="" method="post">
                    {% csrf_token %}
                    {% for field in form %}
                        <div>
                            <label for="">{{ field.label }}</label>
                            {{ field }}
                        </div>
                    {% endfor %}
                    <input type="submit" class="btn btn-default pull-right">
                
</form>

渲染方式3

<form action="" method="post">
    {% csrf_token %}
    
    {{ form.as_p }}
    <input type="submit" class="btn btn-default pull-right">

</form>

3 渲染错误信息功能

视图

def register(request):

    if request.method=="POST":
        form=UserForm(request.POST)
        if form.is_valid():
            print(form.cleaned_data) # 所有干净的字段以及对应的值
        else:
            print(form.cleaned_data) 
            print(form.errors)  # ErrorDict : 
            			# {"校验错误的字段":["错误信息",]}
            print(form.errors.get("name")) # ErrorList ["错误信息",]
        return render(request,"register.html",locals())
    form=UserForm()
    return render(request,"register.html",locals())

模板

<form action="" method="post" novalidate>
    {% csrf_token %}
    
    {% for field in form %}
        <div>
            <label for="">{{ field.label }}</label>
            {{ field }} <span class="pull-right" style="color: red">{{ field.errors.0 }}</span>
        </div>
    {% endfor %}
    <input type="submit" class="btn btn-default">
    
</form>

4 组件的参数配置

class Ret(Form):
    name = forms.CharField(max_length=10, min_length=2, label='用户名',
                           error_messages={'required': '该字段不能为空', 
                                           'invalid': '格式错误', 
                                           'max_length': '太长',
                                           'min_length': '太短'},
                           widget=widgets.TextInput(attrs={'class':'form-control'}))
    pwd = forms.CharField(max_length=10, min_length=2, widget=widgets.PasswordInput(
        attrs={'class':'form-control'}
    ))
    email = forms.EmailField(label='邮箱', error_messages={
       									 'required': '该字段不能为空', 
       									 'invalid': '格式错误'})

5 局部钩子

from django.core.exceptions import NON_FIELD_ERRORS, ValidationError

def clean_name(self):
    val=self.cleaned_data.get("name")

    ret=UserInfo.objects.filter(name=val)

    if not ret:
        return val
    else:
        raise ValidationError("该用户已注册!")

def clean_tel(self):
	val=self.cleaned_data.get("tel")

	if len(val)==11:
		return val
	else:
		raise  ValidationError("手机号格式错误")

6 全局钩子

def clean(self):
	pwd=self.cleaned_data.get('pwd')
    r_pwd=self.cleaned_data.get('r_pwd')

    if pwd and r_pwd:
        if pwd == r_pwd:
            return self.cleaned_data
        else:
            raise ValidationError('两次密码不一致')
	else:
		return self.cleaned_data

pwd_err=my_form.errors.get('__all__')

from django import forms

from django.forms import widgets
from app01.models import UserInfo

from django.core.exceptions import NON_FIELD_ERRORS, ValidationError

class UserForm(forms.Form):
    name=forms.CharField(min_length=4,label="用户名",
                         error_messages={"required":"该字段不能为空"},
                         widget=widgets.TextInput(
                             attrs={"class":"form-control"})
                         )
    
    pwd=forms.CharField(min_length=4,label="密码",
                        widget=widgets.PasswordInput(
                            attrs={"class":"form-control"})
                        )
    
    r_pwd=forms.CharField(min_length=4,
                          label="确认密码",
                          error_messages={"required":"该字段不能为空"},
                          widget=widgets.TextInput(
                              attrs={"class":"form-control"}
                          ))
    
    email=forms.EmailField(label="邮箱",
                           error_messages={
                               "required":"该字段不能为空",
                               "invalid":"格式错误"},
                           widget=widgets.TextInput(
                               attrs={"class":"form-control"}
                           ))
    
    tel=forms.CharField(label="手机号",
                        widget=widgets.TextInput(
                            attrs={"class":"form-control"}
                        ))


    def clean_name(self):
        val=self.cleaned_data.get("name")
        ret=UserInfo.objects.filter(name=val)

        if not ret:
            return val
        else:
            raise ValidationError("该用户已注册!")

    def clean_tel(self):
        val=self.cleaned_data.get("tel")
        
        if len(val)==11:
            return val
        else:
            raise  ValidationError("手机号格式错误")

    def clean(self):
        pwd=self.cleaned_data.get('pwd')
        r_pwd=self.cleaned_data.get('r_pwd')

        if pwd and r_pwd:
            if pwd==r_pwd:
                return self.cleaned_data
            else:
                raise ValidationError('两次密码不一致')
        else:
            return self.cleaned_data

from django.shortcuts import render,HttpResponse

# Create your views here.

from app01.myforms import *


def reg(request):

    if request.method=="POST":

        print(request.POST)

        # form=UserForm({"name":"yu","email":"123@qq.com","xxxx":"alex"})


        form=UserForm(request.POST) # form表单的name属性值应该与forms组件字段名称一致

        print(form.is_valid()) # 返回布尔值

        if form.is_valid():
            print(form.cleaned_data)  # {"name":"yuan","email":"123@qq.com"}
        else:
            print(form.cleaned_data)   # {"email":"123@qq.com"}
            # print(form.errors)       # {"name":[".........."]}
            # print(type(form.errors)) # ErrorDict
            # print(form.errors.get("name"))
            # print(type(form.errors.get("name")))    # ErrorList
            # print(form.errors.get("name")[0])


            # 全局钩子错误
            #print("error",form.errors.get("__all__")[0])
            errors=form.errors.get("__all__")


            return render(request,"reg.html",locals())

        '''
        form.is_valid()   :返回布尔值
        form.cleaned_data :{"name":"yuan","email":"123@qq.com"}
        form.errors       :{"name":[".........."]}
        '''

    form=UserForm()
    return render(request,"reg.html",locals())

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .error{
            color: red;
        }
    </style>
    <!-- 最新版本的 Bootstrap 核心 CSS 文件 -->
    <link rel="stylesheet" href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css"
    integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">
</head>
<body>

<div class="container">

    <div class="row">
        <div class="col-md-6 col-lg-offset-3">

            {#<h3>简单form</h3>#}
            {##}
            {##}
            {#<form action="" method="post" novalidate>#}
            {#    {% csrf_token %}#}
            {#    <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="r_pwd"></p>#}
            {#    <p>邮箱  <input type="text" name="email"></p>#}
            {#    <p>手机号 <input type="text" name="tel"></p>#}
            {#    <input type="submit">#}
            {##}
            {#</form>#}

            <hr>
            <h3>forms组件渲染方式1</h3>
            <form action="" method="post" novalidate>

                {% csrf_token %}
                <p>{{ form.name.label }}
                    {{ form.name }} 
                    <span class="pull-right error">
                        {{ form.name.errors.0 }}
                    </span>
                </p>
                <p>{{ form.pwd.label }}
                    {{ form.pwd }} 
                    <span class="pull-right error">
                        {{ form.pwd.errors.0 }}
                    </span>
                </p>
                
                <p>确认密码
                    {{ form.r_pwd }} 
                    <span class="pull-right error">
                        {{ form.r_pwd.errors.0 }}
                    </span>
                    
                    <span class="pull-right error">
                        {{ errors.0 }}
                    </span>
                </p>
                
                <p>邮箱 {{ form.email }} 
                    <span class="pull-right error">
                        {{ form.email.errors.0 }}
                    </span>
                </p>
                
                <p>手机号 {{ form.tel }} 
                    <span class="pull-right error">
                        {{ form.tel.errors.0 }}
                    </span>
                </p>
                <input type="submit">

            </form>

            {#<h3>forms组件渲染方式2</h3>#}
            {##}
            {#<form action="" method="post" novalidate>#}
            {#     {% csrf_token %}#}
            {##}
            {#    {% for field in form %}#}
            {##}
            {#        <div>#}
            {#            <label for="">{{ field.label }}</label>#}
            {#            {{ field }}#}
            {#        </div>#}
            {##}
            {#    {% endfor %}#}
            {##}
            {#     <input type="submit">#}
            {#</form>#}
            {##}
            {#<h3>forms组件渲染方式3</h3>#}
            {##}
            {#<form action="" method="post">#}
            {#     {% csrf_token %}#}
            {##}
            {#     {{ form.as_p }}#}
            {##}
            {#     <input type="submit">#}
            {#</form>#}

        </div>
    </div>
</div>

</body>
</html>

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原文地址：https://www.cnblogs.com/Dr-wei/p/11838750.html