Django中Form驗證
阿新 • • 發佈：2018-05-07
tex -s AR action doctype color messages forms 大於 
Django的Form主要具有一下幾大功能：
- 生成HTML標簽
- 驗證用戶數據（顯示錯誤信息）
- HTML Form提交保留上次提交數據
- 初始化頁面顯示內容
一,Form驗證
第一種操作：主要是這三個函數
is_valid()
cleaned_data
errors
from xiaoqing import models def form(request): if request.method == "GET": return render(request,‘form.html‘) elif request.method == "POST": obj= FM(request.POST) r1 = obj.is_valid() #is_valid() 讓這個函數去驗證 返回False 或者 True print(r1) if r1: print(r1) print(obj.cleaned_data) #cleaned_data表示返回的正確的信息 # models.Host.objects.create(**obj.cleaned_data) else: print(obj.errors.as_json()) #errors表示錯誤信息 return render(request,‘form.html‘,{‘obj‘:obj,}) return redirect(‘/xiaoqing/host‘)
<form action="/xiaoqing/form/" method="post"> {% csrf_token %} {# {% for row in error_dict.keys %}#} <p><input type="text" placeholder="請輸入用戶名" name="form.htmluser"/><span style="color: red">{{ obj.errors.user.0 }}</span></p> <p><input type="password" placeholder="請輸入密碼" name="pwd"/><span style="color: red">{{ obj.errors.pwd.0 }}</span></p> <p><input type="text" placeholder="請輸入郵箱" name="email"/><span style="color: red">{{ obj.errors.email.0 }}</span></p> <input type="submit" value="提交"/> {# {% endfor %}#} </form>
第二種操作：如果驗證錯誤，用戶信息不會消失
def form(request): if request.method == "GET": obj = FM() #第一次用GET請求時，需要返回客戶端一個對象 return render(request,‘form.html‘,{‘obj‘:obj}) elif request.method == "POST": obj = FM(request.POST) r1 = obj.is_valid() #is_valid() 讓這個函數去驗證 返回False 或者 True print(r1) if r1: print(r1) print(obj.cleaned_data) #cleaned_data表示返回的正確的信息 # models.Host.objects.create(**obj.cleaned_data) else: print(obj.errors.as_json()) #errors表示錯誤信息 return render(request,‘form.html‘,{‘obj‘:obj,}) return redirect(‘/xiaoqing/host‘)views.py
<form action="/xiaoqing/form/" method="post"> {% csrf_token %} {# {% for row in error_dict.keys %}#} <p>{{ obj.user }}<span style="color: red">{{ obj.errors.user.0 }}</span></p> <p>{{ obj.pwd }}<span style="color: red">{{ obj.errors.pwd.0 }}</span></p> <p>{{ obj.email }}<span style="color: red">{{ obj.errors.email.0 }}</span></p> <input type="submit" value="提交"/> {# {% endfor %}#} </form>form.html
二，Form 自定義樣式
from django import forms from django.forms import widgets # 需要import 插件widgets from django.forms import fields #用fields 做字段驗證 class FM(forms.Form): #字段本身只做驗證 它不生成input標簽 user = fields.CharField(error_messages={‘required‘:‘用戶名不能為空‘}, widget=widgets.Textarea(attrs={‘class‘:‘c1‘})) #用attrs 自定義樣式 pwd = fields.CharField(max_length=12, min_length=6, error_messages={‘required‘:‘密碼不能為空‘,‘min_length‘:‘密碼長度不能小於6‘,‘max_length‘:‘密碼長度不能大於12‘}, widget=widgets.PasswordInput) email = fields.EmailField(error_messages={‘required‘:‘郵箱不能為空‘,‘invalid‘:‘郵箱格式錯誤‘})
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> <style> .c1 { background-color: indianred; } </style> </head> <body> <div> {# <form action="/xiaoqing/form/" method="post">#} {# {% csrf_token %}#} {# {% for row in error_dict.keys %}#} {# <p><input type="text" placeholder="請輸入用戶名" name="user"/><span style="color: red">{{ obj.errors.user.0 }}</span></p>#} {# <p><input type="password" placeholder="請輸入密碼" name="pwd"/><span style="color: red">{{ obj.errors.pwd.0 }}</span></p>#} {# <p><input type="text" placeholder="請輸入郵箱" name="email"/><span style="color: red">{{ obj.errors.email.0 }}</span></p>#} {# <input type="submit" value="提交"/>#} {# {% endfor %}#} {# </form>#} {##} <form action="/xiaoqing/form/" method="post"> {% csrf_token %} {# {% for row in error_dict.keys %}#} <p>{{ obj.user }}<span style="color: red">{{ obj.errors.user.0 }}</span></p> <p>{{ obj.pwd }}<span style="color: red">{{ obj.errors.pwd.0 }}</span></p> <p>{{ obj.email }}<span style="color: red">{{ obj.errors.email.0 }}</span></p> <input type="submit" value="提交"/> {# {% endfor %}#} </form> </div> </body> </html>form.html
Django中Form驗證