6.分頁，form組件

1.分頁功能

1.1批量插入數(shù)據(jù)

# 批量插入數(shù)據(jù)
    book_list = []
    for i in range(100):
        book = Book(title="book_%s"%i,price=i*i,publishDate="2012-12-12",publish_id=1)
        book_list.append(book)
    Book.objects.bulk_create(book_list)

1.2Paginator

from django.core.paginator import Paginator, EmptyPage, PageNotAnInteger

    book_list = Book.objects.all()
    paginator = Paginator(book_list, 10)  # 每頁顯示10條數(shù)據(jù)
    print(paginator.count)  # 總數(shù)據(jù)數(shù)  105
    print(paginator.num_pages)  # 總頁數(shù)  11
    print(paginator.page_range)  # 頁碼的列表  range(1, 12)
    page1 = paginator.page(1)  # 第一頁的book對象列表
    print(page1)  # 
    for i in page1:  # 遍歷第一頁的所有數(shù)據(jù)對象
        print(i)  # Book object (16)
    print(page1.object_list)  # 第一頁的所有數(shù)據(jù)[, ... ]

    page2 = paginator.page(2)
    print(page2.has_next())  # 是否有下一頁 True
    print(page2.next_page_number())  # 下一頁的頁碼 3
    print(page2.has_previous())  # 是否有上一頁 True
    print(page2.previous_page_number())  # 上一頁的頁碼 1

        # 拋錯
    page=paginator.page(12)   # error:EmptyPage

    page=paginator.page("z")   # error:PageNotAnInteger

1.3分頁案例

views.py
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from django.shortcuts import render,HttpResponse
from django.core.paginator import Paginator,EmptyPage
from app1.models import *
def index(request):
    book_list = Book.objects.all()
    paginator = Paginator(book_list, 7)  # 每頁顯示7條數(shù)據(jù)
    current_page = int(request.GET.get("page", 1))  # 沒有page這個key,就設置為1

# 這里是保證當前最多只顯示11個頁碼
    if paginator.num_pages > 11:
        if current_page-5<1:
            page_range = range(1,12)
        elif current_page+5>paginator.num_pages:
            page_range = range(paginator.num_pages-10,paginator.num_pages+1)
        else:
            page_range = range(current_page - 5, current_page + 6)
    else:
        page_range = paginator.page_range

    # 顯示當前頁的book對象列表
    try:
        current_page_contents = paginator.page(current_page)
    #     如果數(shù)據(jù)為空，顯示第一頁的數(shù)據(jù)
    except EmptyPage as e:
        current_page_contents = paginator.page(1)

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

index.html




    
    
    
     
    
    



    {% for book_obj in current_page_contents %}
        {{ book_obj.title }}--{{ book_obj.price }}
    {% endfor %}




  

{#    當前頁有上一頁的時候，才可點擊#}
        {% if current_page_contents.has_previous %}
            
            上一頁
            
        {% else %}
            
            上一頁
            
        {% endif %}

      {% for page_num in page_range %}
{#          前面的內(nèi)容就是當前訪問的url#}
          {% if page_num == current_page %}
              {{ page_num }}
          {% else %}
              {{ page_num }}
          {% endif %}

      {% endfor %}

        {% if current_page_contents.has_next %}
            
                下一頁
            
        {% else %}
            
                下一頁
            
        {% endif %}

6.分頁，form組件

2.forms組件

作用：
主要是校驗字段功能

2.1簡單form

注意：
1.即使不是所有字段驗證通過，form.cleaned_data中也有通過驗證的字段的值。
2.前端傳過來的字段可以比UserForm中的字段多，多余的字段不進行驗證。所有字段驗證通過，form.is_valid()返回true。
3.前端傳過來的字段比UserForm中的字段少，form.is_valid()返回false。

forms.py

#!/usr/bin/env python
# -*- coding:utf-8 -*-
# Author: vita
from django import forms
class UserForm(forms.Form):
    name = forms.CharField(min_length=4, label="用戶名", error_messages={"required": "該字段不能為空"})
    pwd = forms.CharField(min_length=4, label="密碼", error_messages={"required": "該字段不能為空"})
    r_pwd = forms.CharField(min_length=4, label="確認密碼", error_messages={"required": "該字段不能為空"})
    email = forms.EmailField(label="郵箱" , error_messages={"required": "該字段不能為空", "invalid": "格式錯誤"})
    tel = forms.CharField(label="手機號")

views.py

from django.shortcuts import render,HttpResponse
from django.core.paginator import Paginator,EmptyPage
from app1.models import *
from app1.myforms import *
def index(request):
    if request.method=="POST":
        print(request.POST)  # 
        form = UserForm(request.POST)
        if form.is_valid():
            print("form.cleaned_data----", form.cleaned_data)
        else:
            print("form.cleaned_data----", form.cleaned_data)  # {'pwd': '1234', 'email': '123@qq.com', 'tel': '123'}
            print("form.errors----", form.errors)
            print("type(form.errors)----", type(form.errors))  # 
            print("form.errors.get('name')----", form.errors.get("name"))  # 該字段不能為空
            print("type(form.errors.get('name'))----", type(form.errors.get("name")))  # 
            print("form.errors.get('name')[0]----", form.errors.get("name")[0])
    return render(request, "index.html", locals())

index.html




    
    
    
     
    
    



    
        簡單form
        
            {% csrf_token %}
            
                用戶名
                
            
            
                密碼
                
            
            
                確認密碼
                
            
            
                郵箱
                
            
            
                手機號

6.分頁，form組件

2.2form三種渲染方式

forms.py

#!/usr/bin/env python
# -*- coding:utf-8 -*-
# Author: vita
from django import forms
from django.forms import widgets

class UserForm(forms.Form):
    # 自定義html中的標簽和添加類
    name = forms.CharField(min_length=4, label="用戶名", error_messages={"required": "該字段不能為空"},widget=widgets.TextInput(attrs={"class": "form-control"}))
    pwd = forms.CharField(min_length=4, label="密碼", error_messages={"required": "該字段不能為空"},widget=widgets.PasswordInput(attrs={"class": "form-control"}))
    r_pwd = forms.CharField(min_length=4, label="確認密碼", error_messages={"required": "該字段不能為空"},widget=widgets.PasswordInput(attrs={"class": "form-control"}))
    email = forms.EmailField(label="郵箱", error_messages={"required": "該字段不能為空", "invalid": "格式錯誤"},widget=widgets.EmailInput(attrs={"class": "form-control"}))
    tel = forms.CharField(label="手機號", widget=widgets.TextInput(attrs={"class": "form-control"}))

views.py

from django.shortcuts import render,HttpResponse
from django.core.paginator import Paginator,EmptyPage
from app1.models import *
from app1.myforms import *
def index(request):
    form = UserForm()
    if request.method=="POST":
        print(request.POST)  # 
        form = UserForm(request.POST)
        if form.is_valid():
            print("form.cleaned_data----", form.cleaned_data)
        else:
            print("form.cleaned_data----", form.cleaned_data)  # {'pwd': '1234', 'email': '123@qq.com', 'tel': '123'}
            print("form.errors----", form.errors)
            print("type(form.errors)----", type(form.errors))  # 
            print("form.errors.get('name')----", form.errors.get("name"))  # 該字段不能為空
            print("type(form.errors.get('name'))----", type(form.errors.get("name")))  # 
            print("form.errors.get('name')[0]----", form.errors.get("name")[0])
    return render(request, "index.html", locals())

2.2.1渲染方式1

index.html




    
    
    
     
    
    



    
        form組件渲染方式1
        
            {% csrf_token %}
            
                {{ form.name.label }}
                {{ form.name }} {{ form.name.errors.0 }}
            
            
                {{ form.pwd.label }}
                {{ form.pwd }} {{ form.pwd.errors.0 }}
            
            
                {{ form.r_pwd.label }}
                {{ form.r_pwd }} {{ form.r_pwd.errors.0 }}
            
            
                {{ form.email.label }}
                                
                {{ form.email }} {{ form.email.errors.0 }}
            
            
                手機號
                {{ form.tel }} {{ form.tel.errors.0 }}

6.分頁，form組件

2.2.2渲染方式2

index.html




    
    
    
     
    
    



    
        form組件渲染方式2
        
            {% csrf_token %}
            {% for field in form %}
                
                    {{ field.label }}
                    {{ field }}
                
            {% endfor %}

6.分頁，form組件

2.2.3渲染方式3

index.html




    
    
    
     
    
    



    
        form組件渲染方式3
        
            {% csrf_token %}
            {{ form.as_p }}

6.分頁，form組件

2.3form組件局部鉤子

# 局部鉤子函數(shù)名為clean_UserForm中字段名
# 返回值為val，報錯時raise ValidationError("用戶名長度最長為12")
# 錯誤信息存放在form.errors.get("字段名")[0]
def clean_name(self):
        val = self.cleaned_data.get("name")
        if len(val)<12:
            return val
        else:
            raise ValidationError("用戶名長度最長為12")

查看源碼

form.is_valid()

    def is_valid(self):
        """Return True if the form has no errors, or False otherwise."""
        return self.is_bound and not self.errors

        @property
    def errors(self):
        """Return an ErrorDict for the data provided for the form."""
        if self._errors is None:
            self.full_clean()
        return self._errors

    def full_clean(self):
        """
        Clean all of self.data and populate self._errors and self.cleaned_data.
        """
        self._errors = ErrorDict()
        if not self.is_bound:  # Stop further processing.
            return
        self.cleaned_data = {} # 是一個字典
        # If the form is permitted to be empty, and none of the form data has
        # changed from the initial data, short circuit any validation.
        if self.empty_permitted and not self.has_changed():
            return

        self._clean_fields() #局部鉤子所在源碼處，先執(zhí)行局部鉤子函數(shù)，然后執(zhí)行全局鉤子函數(shù)
        self._clean_form() #全局鉤子所在源碼處
        self._post_clean()

    def _clean_fields(self):
        for name, field in self.fields.items():
            # value_from_datadict() gets the data from the data dictionaries.
            # Each widget type knows how to retrieve its own data, because some
            # widgets split data over several HTML fields.
            if field.disabled:
                value = self.get_initial_for_field(field, name)
            else:
                value = field.widget.value_from_datadict(self.data, self.files, self.add_prefix(name))
            try:
                if isinstance(field, FileField):
                    initial = self.get_initial_for_field(field, name)
                    value = field.clean(value, initial)
                else:
                    value = field.clean(value)
                self.cleaned_data[name] = value #可以看到，驗證通過的字段賦值給了cleaned_data.
                if hasattr(self, 'clean_%s' % name):
                    value = getattr(self, 'clean_%s' % name)()
                    self.cleaned_data[name] = value
            except ValidationError as e:
                self.add_error(name, e)

6.分頁，form組件

2.3.1局部鉤子案例

forms.py

#!/usr/bin/env python
# -*- coding:utf-8 -*-
# Author: vita
from django import forms
from django.forms import widgets
from django.core.exceptions import ValidationError
class UserForm(forms.Form):
    # 自定義html中的標簽和添加類
    name = forms.CharField(min_length=4, label="用戶名", error_messages={"required": "該字段不能為空"},widget=widgets.TextInput(attrs={"class": "form-control"}))
    pwd = forms.CharField(min_length=4, label="密碼", error_messages={"required": "該字段不能為空"},widget=widgets.PasswordInput(attrs={"class": "form-control"}))
    r_pwd = forms.CharField(min_length=4, label="確認密碼", error_messages={"required": "該字段不能為空"},widget=widgets.PasswordInput(attrs={"class": "form-control"}))
    email = forms.EmailField(label="郵箱", error_messages={"required": "該字段不能為空", "invalid": "格式錯誤"},widget=widgets.EmailInput(attrs={"class": "form-control"}))
    tel = forms.CharField(label="手機號", widget=widgets.TextInput(attrs={"class": "form-control"}))

# 局部鉤子函數(shù)，必須是clean_字段名
    def clean_tel(self):
        val = self.cleaned_data.get("tel")
        if len(val)==11:
            return val
        else:
            raise ValidationError("手機格式錯誤")

    def clean_name(self):
        val = self.cleaned_data.get("name")
        if len(val)<12:
            return val
        else:
            raise ValidationError("用戶名長度最長為12")

views.py

from django.shortcuts import render,HttpResponse
from django.core.paginator import Paginator,EmptyPage
from app1.models import *
from app1.myforms import *
def index(request):
    form = UserForm()
    if request.method=="POST":
        print(request.POST)  # 
        form = UserForm(request.POST)
        if form.is_valid():
            print("form.cleaned_data----", form.cleaned_data)
        else:
            print("form.cleaned_data----", form.cleaned_data)  # {'pwd': '1234', 'email': '123@qq.com', 'tel': '123'}
            print("form.errors----", form.errors)
            print("type(form.errors)----", type(form.errors))  # 
            print("form.errors.get('name')----", form.errors.get("name"))  # 該字段不能為空
            print("type(form.errors.get('name'))----", type(form.errors.get("name")))  # 
            print("form.errors.get('name')[0]----", form.errors.get("name")[0])
    return render(request, "index.html", locals())

index.html




    
    
    
     
    
    



    
        forms組件渲染方式1
            

                {% csrf_token %}
                {{ form.name.label }}
                    {{ form.name }} {{ form.name.errors.0 }}
                
                {{ form.pwd.label }}
                    {{ form.pwd }} {{ form.pwd.errors.0 }}
                
                確認密碼
                    {{ form.r_pwd }} {{ form.r_pwd.errors.0 }}{{ errors.0 }}
                
                郵箱 {{ form.email }} {{ form.email.errors.0 }}
                手機號 {{ form.tel }} {{ form.tel.errors.0 }}

6.分頁，form組件

2.4form組件全局鉤子

    # 全局鉤子，函數(shù)名必須為clean
    # 返回值是self.cleaned_data，報錯時raise ValidationError("兩次密碼不一致")
    # 錯誤信息存放在errors = form.errors.get("__all__").[0]
    def clean(self):
        pwd = self.cleaned_data.get("pwd")
        r_pwd=self.cleaned_data.get("r_pwd")
        # 當密碼驗證不通過的時候，假如密碼pwd為空，就不要驗證密碼是否一致了
        if pwd and r_pwd:
            if pwd==r_pwd:
                return self.cleaned_data
            else:
                raise ValidationError("兩次密碼不一致")
        else:
            return self.cleaned_data

全局鉤子源碼

    def _clean_form(self):
        try:
            cleaned_data = self.clean()
        except ValidationError as e:  #這里捕獲ValidationError,所以自己定義的函數(shù)中拋出該異常
            self.add_error(None, e)
        else:
            if cleaned_data is not None:
                self.cleaned_data = cleaned_data

    def clean(self):
        """
        Hook for doing any extra form-wide cleaning after Field.clean() has been
        called on every field. Any ValidationError raised by this method will
        not be associated with a particular field; it will have a special-case
        association with the field named '__all__'.
        """
        return self.cleaned_data   #所以我們重寫clean方法，返回值為cleaned_data

6.分頁，form組件

2.4.1全局鉤子案例

forms.py

#!/usr/bin/env python
# -*- coding:utf-8 -*-
# Author: vita
from django import forms
from django.forms import widgets
from django.core.exceptions import ValidationError
class UserForm(forms.Form):
    # 自定義html中的標簽和添加類
    name = forms.CharField(min_length=4, label="用戶名", error_messages={"required": "該字段不能為空"},widget=widgets.TextInput(attrs={"class": "form-control"}))
    pwd = forms.CharField(min_length=4, label="密碼", error_messages={"required": "該字段不能為空"},widget=widgets.PasswordInput(attrs={"class": "form-control"}))
    r_pwd = forms.CharField(min_length=4, label="確認密碼", error_messages={"required": "該字段不能為空"},widget=widgets.PasswordInput(attrs={"class": "form-control"}))
    email = forms.EmailField(label="郵箱", error_messages={"required": "該字段不能為空", "invalid": "格式錯誤"},widget=widgets.EmailInput(attrs={"class": "form-control"}))
    tel = forms.CharField(label="手機號", widget=widgets.TextInput(attrs={"class": "form-control"}))

    def clean_tel(self):
        val = self.cleaned_data.get("tel")
        if len(val)==11:
            return val
        else:
            raise ValidationError("手機格式錯誤")

    def clean_name(self):
        val = self.cleaned_data.get("name")
        if len(val)<12:
            return val
        else:
            raise ValidationError("用戶名長度最長為12")

    # 全局鉤子，函數(shù)名必須為clean
    def clean(self):
        pwd = self.cleaned_data.get("pwd")
        r_pwd=self.cleaned_data.get("r_pwd")
        # 當密碼驗證不通過的時候，假如密碼pwd為空，就不要驗證密碼是否一致了
        if pwd and r_pwd:
            if pwd==r_pwd:
                return self.cleaned_data
            else:
                raise ValidationError("兩次密碼不一致")
        else:
            return self.cleaned_data

vews.py

from django.shortcuts import render,HttpResponse
from django.core.paginator import Paginator,EmptyPage
from app1.models import *
from app1.myforms import *
def index(request):
    form = UserForm()
    if request.method=="POST":
        print(request.POST)  # 
        form = UserForm(request.POST)
        if form.is_valid():
            print("form.cleaned_data----", form.cleaned_data)
        else:
            print("form.cleaned_data----", form.cleaned_data)  # {'pwd': '1234', 'email': '123@qq.com', 'tel': '123'}
            print("form.errors----", form.errors)
            print("type(form.errors)----", type(form.errors))  # 
            print("form.errors.get('name')----", form.errors.get("name"))  # 該字段不能為空
            print("type(form.errors.get('name'))----", type(form.errors.get("name")))  # 
            print("form.errors.get('name')[0]----", form.errors.get("name")[0])

            errors = form.errors.get("__all__")
            print("errors----", errors)  # 兩次密碼不一致
            print("type(errors)----", type(errors))  # 
    return render(request, "index.html", locals())

index.html




    
    
    
     
    
    



    
        forms組件渲染方式1
            

                {% csrf_token %}
                {{ form.name.label }}
                    {{ form.name }} {{ form.name.errors.0 }}
                
                {{ form.pwd.label }}
                    {{ form.pwd }} {{ form.pwd.errors.0 }}
                
                確認密碼
                    {{ form.r_pwd }} {{ form.r_pwd.errors.0 }}{{ errors.0 }}
                
                郵箱 {{ form.email }} {{ form.email.errors.0 }}
                手機號 {{ form.tel }} {{ form.tel.errors.0 }}

6.分頁，form組件

標題名稱：6.分頁，form組件
文章出自：http://weahome.cn/article/jjgecd.html

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6.分頁，form組件

1.分頁功能

1.1批量插入數(shù)據(jù)

1.2Paginator

1.3分頁案例

2.forms組件

2.1簡單form

簡單form

2.2form三種渲染方式

2.2.1渲染方式1

form組件渲染方式1

2.2.2渲染方式2

form組件渲染方式2

2.2.3渲染方式3

form組件渲染方式3

2.3form組件局部鉤子

2.3.1局部鉤子案例

forms組件渲染方式1

2.4form組件全局鉤子

2.4.1全局鉤子案例

forms組件渲染方式1

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6.分頁，form組件

1.分頁功能

1.1批量插入數(shù)據(jù)

1.2Paginator

1.3分頁案例

2.forms組件

2.1簡單form

簡單form

2.2form三種渲染方式

2.2.1渲染方式1

form組件渲染方式1

2.2.2渲染方式2

form組件渲染方式2

2.2.3渲染方式3

form組件渲染方式3

2.3form組件局部鉤子

2.3.1局部鉤子案例

forms組件渲染方式1

2.4form組件全局鉤子

2.4.1全局鉤子案例

forms組件渲染方式1

其他資訊

網(wǎng)站制作

企業(yè)服務

網(wǎng)站建設

服務器托管

6.分頁，form組件