问题描述
很抱歉,如果措辞不太好。未满足验证要求时,似乎看不到任何错误消息。当我提交时,表单只是刷新而没有错误消息,例如“此字段为必填”。
此外,当我输入数据时,if form.validate_on_submit():
没有返回预期的首页,而是再次刷新了页面。我知道该表单没有任何作用,我计划添加提交到数据库的数据,但是我仍然坚持这一步骤。有人可以帮忙吗?谢谢。
app.py
from cs50 import sql
from flask import Flask,render_template,session,redirect
from flask_session import Session
from flask_wtf import FlaskForm
from wtforms import StringField,PasswordField,BooleanField #bool for checkBox
from wtforms.validators import Inputrequired,Email,Length
# configure application
app = Flask(__name__)
app.config["SESSION_PERMENANT"] = False
app.config["SESSION_TYPE"] = "filesystem"
Session(app)
# Allows webpage to update html on refresh
app.config["TEMPLATES_AUTO_RELOAD"] = True
app.config['SECRET_KEY'] = 'Itsasecret'
# configure CS50 library to use sqlite database
db = sql("sqlite:///project.db")
# Usually separate routes,database and form stuff into different files and link together
class LoginForm(FlaskForm):
username = StringField('Username',validators=[Inputrequired(),Length(min=4,max=15)])
password = PasswordField('Password',Length(min=8,max=80)]) #80 is a special number (learn more)
remember = BooleanField('Remember me')
@app.route('/')
def homepage():
return render_template("homepage.html")
@app.route('/login',methods=['GET','POST'])
def login():
form = LoginForm()
if form.validate_on_submit():
return redirect("/")
return render_template("login.html",form=form)
登录模板
{% extends "layout.html" %}
{% from "_formhelpers.html" import render_field %}
{% set active_page = 'login' %}
{% block title %} Login {% endblock %}
{% block body %}
<div class="ls-main">
<form action="/login" method="POST">
{{ form.csrf_token }}
{{ render_field(form.username) }}
{{ render_field(form.password,autocomplete="off") }}
{{ render_field(form.remember) }}
<div class="ls-div">
<input class="ls-input,signinbutton" name="submit" type="submit" value="Submit">
</div>
</form>
</div>
{% endblock %}
_formhelpers.html
{% macro render_field(field) %}
<dt>{{ field.label }}
<dd>{{ field(**kwargs)|safe }}
{% if field.errors %}
<ul class=errors>
{% for error in field.errors %}
<li>{{ error }}</li>
{% endfor %}
</ul>
{% endif %}
</dd>
{% endmacro %}
解决方法
return render_template("/")
无效。我认为您的意思是return redirect("/")
您当然需要from flask import Flask,render_template,session,redirect