day114-djaong-Form组件-保留用户输入的信息，引入了bootstrap 

from django.shortcuts import render,HttpResponse,redirect
from django.forms import Form,fields,widgets
class LoginForm(Form):
    username = fields.CharField(
        min_length = 6,
        max_length = 16,
        required = True,
        #html插件，增加标签属性class='form-control',类名form-control是复制bootstrap，
        #这样才有bootstrap的样式
        widget=widgets.TextInput(attrs={'class':'form-control'}),
        error_messages={
            'min_length':'至少6位',
            'max_length':'至多16位',
            'required':'不能为空'
        }
    )
    password = fields.CharField(
        min_length=6,
        max_length=16,
        required=True,
        widget=widgets.TextInput(attrs={'class': 'form-control'}),
        error_messages={
            'min_length': '至少6位',
            'max_length': '至多16位',
            'required': '不能为空'
        }
    )

def login(request):
    if request.method == 'GET':
        #obj.username在html里面生成了<input type="text" name="username">，它没有value
        obj = LoginForm()
        return render(request,'login.html',{'obj':obj})
    else:
        #request.POST有用户信息，给上面标签生成了value，
        #<input type="text" name="username" value=xx>,value当做默认值返回，
        #所以就保留了输入的信息
        obj = LoginForm(request.POST)
        result = obj.is_valid()
        if result:
            print(obj.cleaned_data)
            return redirect('http://www.sogo.com')
        else:
            return render(request,'login.html',{'obj':obj})
<body>

{#<form method="POST" action="/login" novalidate>#}
{#    {% csrf_token %}#}
{#    <p>用户名：#}
{#        {{ obj.username }}{{ obj.errors.username.0 }}#}
{#    </p>#}
{#    <p>密码：#}
{#        {{ obj.password }}{{ obj.errors.password.0 }}#}
{#    </p>#}
{#    <p>#}
{#        <input type="submit" value="提交">#}
{#    </p>#}
{#</form>#}

<div style="width:500px;margin:10% auto">
    <!--bootstrap代码，记得写上method和action，novalidate就是不需要浏览器帮我们做验证(测试的时候用)-->
    <form class="form-horizontal" method="POST" action="/login" novalidate>
        {% csrf_token %}
        <div class="form-group">
            <label for="inputEmail3" class="col-sm-2 control-label">用户名</label>
            <div class="col-sm-10">
<!--obj.username生成了<input type="text" name="username">-->
                {{ obj.username }}
                {{ obj.errors.username.0 }}

{# bootstrap原代码 <input type="email" class="form-control" id="inputEmail3" placeholder="Email">#}
            </div>
        </div>
        <div class="form-group">
            <label for="inputPassword3" class="col-sm-2 control-label">密码</label>
            <div class="col-sm-10">

                {{ obj.password }}{{ obj.errors.password.0 }}

{# bootstrap原代码 <input type="password" class="form-control" id="inputPassword3" placeholder="Password">#}
            </div>
        </div>
        <div class="form-group">
            <div class="col-sm-offset-2 col-sm-10">
                <button type="submit" class="btn btn-default">提交</button>
            </div>
        </div>
    </form>
</div>
</body>

 

posted @ 2020-05-08 09:13  梁劲雄  阅读(147)  评论(0)  编辑  收藏  举报