Django之Forms组件
Posted yuliangkaiyue
tags:
篇首语：本文由小常识网(cha138.com)小编为大家整理，主要介绍了Django之Forms组件相关的知识，希望对你有一定的参考价值。
froms组件
校验字段
校验字段是forms组件最重要的功能。
以用户注册为例
模型
class UserInfo(models.Model): name=models.CharField(max_length=32) pwd=models.CharField(max_length=32) email=models.EmailField() tel=models.CharField(max_length=32)
模板
<!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
1 class Userform(forms.Form): 2 name = forms.CharField(min_length=4) 3 pwd = forms.CharField(min_length=4) 4 re_pwd = forms.CharField(min_length=4) 5 email = forms.EmailField() 6 tel = forms.CharField(label=‘电话‘) 7 8 def register(request): 9 10 if request.method=="POST": 11 form=UserForm(request.POST) # 会按照相对应的字段进行匹配，字段可以在Userform的字段基础上多，不会出错，但是已有字段一个也不能少 12 if form.is_valid(): # 如果校验通过 13 print(form.cleaned_data) # 所有干净的字段以及对应的值 14 else: 15 print(form.cleaned_data) # 16 print(form.errors) # ErrorDict : {"校验错误的字段":["错误信息",]} 17 print(form.errors.get("name")) # ErrorList ["错误信息",] 18 return HttpResponse("OK") 19 form=UserForm() 20 return render(request,"register.html",locals())
渲染标签功能
方式一
1 <!DOCTYPE html> 2 <html lang="en"> 3 <head> 4 <meta charset="UTF-8"> 5 <title>Title</title> 6 <!-- 最新版本的 Bootstrap 核心 CSS 文件 --> 7 <link rel="stylesheet" href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous"> 8 </head> 9 <body> 10 <h3>注册页面</h3> 11 <div class="container"> 12 <div class="row"> 13 <div class="col-md-6 col-lg-offset-3"> 14 15 <form action="" method="post"> 16 {% csrf_token %} 17 <div> 18 <label for="">用户名</label> 19 {{ form.name }} 20 </div> 21 <div> 22 <label for="">密码</label> 23 {{ form.pwd }} 24 </div> 25 <div> 26 <label for="">确认密码</label> 27 {{ form.r_pwd }} 28 </div> 29 <div> 30 <label for=""> 邮箱</label> 31 {{ form.email }} 32 </div> 33 34 <input type="submit" class="btn btn-default pull-right"> 35 </form> 36 </div> 37 </div> 38 </div> 39 40 41 42 </body> 43 </html>
方式二
1 <form action="" method="post"> 2 {% csrf_token %} 3 4 {% for field in form %} 5 <div> 6 <label for="">{{ field.label }}</label> 7 {{ field }} 8 </div> 9 {% endfor %} 10 <input type="submit" class="btn btn-default pull-right"> 11 12 </form>
方式三
1 <form action="" method="post"> 2 {% csrf_token %} 3 4 {{ form.as_p }} 5 <input type="submit" class="btn btn-default pull-right"> 6 7 </form>
显示错误与重置输入信息功能
模板
1 <form action="" method="post" novalidate> 2 {% csrf_token %} 3 <p>{{ form.name.label }} 4 {{ form.name }} <span>{{ form.name.errors.0 }}</span> 5 </p> 6 <p> 7 {{ form.pwd.label }} 8 {{ form.pwd }}<span>{{ form.pwd.errors.0 }}</span> 9 </p> 10 <div> 11 确认密码{{ form.re_pwd }}<span>{{ form.re_pwd.errors.0 }}</span> 12 </div> 13 <div> 14 邮箱<input type="email" class="form-control" name="email"><span>{{ form.email.errors.0 }}</span> 15 </div> 16 <div> 17 电话<input type="text" class="form-control" name="tel"><span>{{ form.tel.errors.0 }}</span> 18 </div> 19 <input type="submit" class="btn btn-success"> 20 </form>
注意：novalidate 一定要加上，不然浏览器会替你校验，校验效果不是自己设计的样子
视图
from django.shortcuts import render, HttpResponse # form组件 from django import forms from django.forms import widgets class Userform(forms.Form): name = forms.CharField(min_length=4, label=‘用户名‘, error_messages={"required": "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‘}), error_messages={‘required‘: ‘不能为空‘}) re_pwd = forms.CharField(min_length=4,widget=widgets.TextInput(attrs={‘class‘: ‘form-control‘})) email = forms.EmailField(widget=widgets.EmailInput(attrs={‘class‘: ‘form-control‘})) tel = forms.CharField(label=‘电话‘,widget=widgets.TextInput(attrs={‘class‘: ‘form-control‘})) def reg(request): if request.method == ‘POST‘: form = Userform(request.POST) # 模板中的name属性对应Userform的每一个字段，字段名与响应的name属性一致 print(form.is_valid()) if form.is_valid(): print(form.cleaned_data) else: print(form.cleaned_data) print(form.errors) # print(form.errors.get(‘name‘)) # name不传值 <ul class="errorlist"><li>This field is required.</li></ul> # print(type(form.errors.get(‘name‘))) # <class ‘django.forms.utils.ErrorList‘> # print(form.errors.get(‘name‘)[0]) # 获取错误信息 This field is required. return render(request, ‘reg.html‘, locals()) form = Userform() return render(request, ‘reg.html‘, {‘form‘: form})
局部钩子与全局钩子
视图
# forms组件 from django.forms import widgets wid_01=widgets.TextInput(attrs={"class":"form-control"}) wid_02=widgets.PasswordInput(attrs={"class":"form-control"}) from django.core.exceptions import ValidationError 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) # 局部钩子 def clean_name(self): val=self.cleaned_data.get("name") if not val.isdigit(): return val else: raise ValidationError("用户名不能是纯数字!") # 全局钩子 def clean(self): pwd=self.cleaned_data.get("pwd") r_pwd=self.cleaned_data.get("r_pwd") if pwd==r_pwd: return self.cleaned_data else: raise ValidationError(‘两次密码不一致!‘) 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: clean_error=form.errors.get("__all__") 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"> {% if field.label == ‘R pwd‘ %} <span>{{ clean_error.0 }}</span> {% endif %} {{ field.errors.0 }} </span> </div> {% endfor %} <input type="submit" class="btn btn-default"> </form>
以上是关于Django之Forms组件的主要内容，如果未能解决你的问题，请参考以下文章