Form 组件:ChoiceField、MultiplChoiceFiedld、常用插件、解决Form动态添加BUG、From 验证流程、额外正则添加、Form 扩展钩子函数、文件上传

1、Form 组件、Form动态添加BUG

ChoiceField、MultiplChoiceFiedld

def teacher_list(request):
    if request.method == 'GET':
        tdata = models.Teacher.objects.all()
        print(tdata)
        # print(tdata.tname)
        return render(request,'teacher_list.html',{'tdata':tdata})

teacher_list.html ：
<body>
<h1>老师列表</h1>
<div><a href="/add_teacher/">添加</a></div>
<table border="1">
    <thead>
    <tr>
        <th>ID</th>
        <th>老师姓名</th>
        <th>任教班级</th>

    </tr>
    </thead>
    <tbody>
        {% for row in tdata %}
            <tr>
                <td>{{ row.id }}</td>
                <td>{{ row.tname }}</td>
                <td>None-----</td>
                <td><a href="/edit_teacher/{{ row.id }}">编辑</a></td>

            </tr>
        {% endfor %}

    </tbody>

</table>

</body>




class TeacherForm(Form):
    tname = fields.CharField(min_length=2)

    # 下面写法只能获取到单个字 (因为相当于request.POST.get('xx'))
    # xx = fields.CharField(
        # widget=widgets.Select(choices=models.Classes.objects.values_list('id','title'),attrs={'multiple':'multiple'})
    # )

    # 获取多个值用下面写法(多选的select下拉框)：  choices 写在外面，用 MultipleChoiceField类型
    xx = fields.MultipleChoiceField(
        choices=models.Classes.objects.values_list('id', 'title'),
        widget=widgets.SelectMultiple
    )

    # 解决Form动态添加BUG：
    def __init__(self,*args,**kwargs):
        super(TeacherForm,self).__init__(*args,**kwargs)
        self.fields['xx'].choices = models.Classes.objects.values_list('id','title')



def add_teacher(request):
    if request.method == 'GET':
        obj = TeacherForm()
        return render(request,'add_teacher.html',{'obj':obj})
    else:
        obj = TeacherForm(request.POST)
        if obj.is_valid():
            print(obj.cleaned_data)
            xx = obj.cleaned_data.pop('xx')
            print(obj.cleaned_data)
            row = models.Teacher.objects.create(**obj.cleaned_data)
            print(xx)
            row.c2t.add(*xx)
            return redirect('/teacher_list/')
        return render(request, 'add_teacher.html', {'obj': obj})


def edit_teacher(request,tid):
    if request.method == 'GET':
        row = models.Teacher.objects.filter(id=tid).first()
        class_ids = row.c2t.values_list('id')
        id_list = list(zip(*class_ids))[0] if list(zip(*class_ids)) else []

        obj = TeacherForm(initial={'tname':row.tname,'xx':id_list})
        return  render(request,'edit_teacher.html',{'obj':obj})

2、常用插件

   CheckBox # 单选： xx = fields.CharField(
                           widget=widgets.CheckboxInput
                           )

            # 多选： xx = field.MultipleChoiceField(
                           choices=[(1,'篮球'),(2,'足球')],
                           widget=widgets.CheckboxSelectMultiple
                           )

   radio # 互斥只能单选: xx = fields.ChoiceField(
                           choices=[(1,'篮球'),(2,'足球')],
                           widget=widgets.RadioSelect
 )


   input
   textarea  # xx = fields.CharField(widget=widgets.Textarea(attrs={自定属性}))

   File # 上传文件 ： xx = fields.FileField(
                      widget=widgets.FileInput
 )

3、Form验证流程、钩子扩展函数、额外正则添加

# From 验证流程
# 额外正则添加: 以下为要用的库：
#from django.forms import Form,widgets,fields
from django.core.validators import RegexValidator

# Form 扩展钩子函数：
# 源码：self._clean_fields()
#       self._clean_form()
#       self._post_clean()

# 验证流程：先遍历字段，把每一个字段进行验证，验证通过后执行对应字段的函数，函数返回值，赋值给self.clean_data
from django.core.exceptions import ValidationError # 抛出异常需要用到此类
class TestForm(Form):
    user = fields.CharField(
        # 额外正则 (在默认正则外进行的正则验证)
        validators=[RegexValidator(r'^[0-9]+$','请输入数字'),RegexValidator(r'^159[0-9]+$','数字必须159开头')]
    )
    pwd = fields.CharField()

    # 验证通过后会调用字段对应的函数：
    def clean_user(self):
        v = self.cleaned_data['user']
        if models.Student.objects.filter(name=v).count():

            # 异常类需要导入使用
            raise ValidationError('用户名已经存在',code='invalid')
        else:
            pass
        # 函数必须要有返回值
        return self.cleaned_data['user']

    def clean_pwd(self):
        return self.cleaned_data['pwd']

    # 这个函数在 以上字段正则校验完成后才会执行
    def clean(self):
        # 如果要对整体数据进行验证的话，可适用于此函数
        # 例：
        user = self.cleaned_data.get('user')
        email = self.cleaned_data.get('emai')
        if models.Student.objects.filter(name=user,email=email).count():
            raise ValidationError('用户名或邮箱已存在')

        # 如果返回值为空，则不重新赋值cleaned_data。否则重新赋值
        return self.cleaned_data

    # 用不着，需要自己写异常处理等。了解即可
    def _post_clean(self):
        pass

def test(request):
    obj = TestForm()
    return render(request,'test.html',{"obj":obj})

4、文件上传

def f1(request):
    if request.method == 'GET':
        return render(request,'f1.html')
    else:
        import os

        file_obj = request.FILES.get('fafafa')
        print(file_obj.name)
        print(file_obj.size)

        # 按块循环取文件内容：
        f = open(os.path.join('static',file_obj.name),'wb')
        for chunk in file_obj.chunks():
            f.write(chunk)
        f.close()

        return render(request, 'f1.html')


class F2Form(Form):
    user = fields.CharField()
    fafafa = fields.FileField()

def f2(request):
    if request.method == 'GET':
        obj = F2Form()
        return render(request,'f2.html',{'obj':obj})

    else:
        obj = F2Form(request.POST,files=request.FILES)
        if obj.is_valid():
            f2_file = obj.cleaned_data.get('fafafa')
            print(f2_file.name)
            print(f2_file.size)
        return render(request,'f2.html',{'obj':obj})

f1.html

<body>
<form method="POST" action="/f1/" enctype="multipart/form-data">
    {% csrf_token %}
    <input type="file" name="fafafa">
    <input type="submit" value="提交">

</form>


</body>

posted @ 2018-05-16 10:55 G500 阅读(280) 评论(0) 收藏举报

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Form 组件:ChoiceField、MultiplChoiceFiedld、常用插件、解决Form动态添加BUG、From 验证流程、额外正则添加、Form 扩展钩子函数、文件上传

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