怎样使用表单 forms
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2023-12-01
问题:
怎样使用表单 forms
解决:
‘web.form’模块提供支持创建,校验和显示表单。该模块包含一个’Form’类和各种输入框类如’Textbox’,’Password’等等。
当’form.validates()’调用时,可以针对每个输入检测的哪个是有效的,并取得校验理由列表。
‘Form’类同样可以使用完整输入附加的关键字参数’validators’来校验表单。
这里是一个新用户注册的表单的示例:
import web
from web import form
render = web.template.render('templates') # your templates
vpass = form.regexp(r".{3,20}$", 'must be between 3 and 20 characters')
vemail = form.regexp(r".*@.*", "must be a valid email address")
register_form = form.Form(
form.Textbox("username", description="Username"),
form.Textbox("email", vemail, description="E-Mail"),
form.Password("password", vpass, description="Password"),
form.Password("password2", description="Repeat password"),
form.Button("submit", type="submit", description="Register"),
validators = [
form.Validator("Passwords did't match", lambda i: i.password == i.password2)]
)
class register:
def GET(self):
# do $:f.render() in the template
f = register_form()
return render.register(f)
def POST(self):
f = register_form()
if not f.validates():
return render.register(f)
else:
# do whatever is required for registration
然后注册的模板应该像是这样:
$def with(form)
<h1>Register</h1>
<form method="POST">
$:form.render()
</form>