Python flask front-end and back-end interaction issues

Question

I think the id below is equal to the user.id above but I don’t know how to get this value

Answer 1

Thanks for the invitation. Just use the parameters of the view function directly.

http://flask.pocoo.org/docs/0...

Answer 2

Thank you for the invitation. Here is an idea to use flask_wtf to interact with front-end and back-end forms. To get started, you can see
http://flask123.sinaapp.com/a...

Here is a simple login example:
First, construct the form on the backend and define it in forms.py:

from flask_wtf import Form
from wtforms import StringField, PasswordField, BooleanField, SubmitField
from wtforms.validators import Required, Length, Email, Regexp, EqualTo

#自定义的表单都要继承于flask_wtf中的Form表单
class LoginForm(Form):
    email = StringField('登陆邮箱', validators=[Required(), Length(1, 64),
                                            Email()])
    password = PasswordField('密码', validators=[Required()])
    remember_me = BooleanField('记住我')
    submit = SubmitField('登陆')

So how to put this form on the web page? Let’s take a look at login.html first:

{% extends "base.html" %}
<!-- 注意这里要导入bootstrap/wtf.html -->
{% import "bootstrap/wtf.html" as wtf %}
{% set active_page = "login" %}
{% block title %}登陆{% endblock %}

{% block page_content %}
<p class="container">
    <p class="page-header" style="margin-top: 120px;">
        <h1 class="white">登陆</h1>
    </p>
    <p class="col-md-4" >
    
        <!-- 这里使用wtf.quick_form即可创建表单，那么form哪里来呢？看下面 -->
        {{ wtf.quick_form(form) }}
        
        <br>
        <p>忘记密码？ <a href="{{ url_for('auth.password_reset_request') }}">重置密码。</a></p>
        <p>没有账号？ <a href="{{ url_for('auth.register') }}">注册。</a></p>
    </p>
</p>
{% endblock %}

So where does the form in login.html中的form是哪里来的呢？让我们来看路由views.py come from? Let’s look at routing views.py

from flask import render_template, redirect, request, url_for, flash
from .forms import LoginForm
from ..models import User

@auth.route('/login', methods=['GET', 'POST'])
def login():
    #从forms.py中导入刚刚建好的 LoginForm()
    form = LoginForm()
    #【你要的答案在这里，当用户提交表单后会执行下列语句】
    if form.validate_on_submit():
        #用form.xxx.data即可获取数据，这里使用了form.email.data获取了用户输入的email进行查询
        user = User.query.filter_by(email=form.email.data).first()
        #如果查询到用户并且密码正确的话
        if user is not None and user.verify_password(form.password.data):
            #登陆用户，并重定向到之前的页面或主页
            login_user(user, form.remember_me.data)
            return redirect(request.args.get('next') or url_for('main.index'))
        #否则提示用户用户名不对或密码不对
        flash('Invalid username or password.')
    #！！！这里要注意，第一次用户开进这个登陆界面的时候是直接执行下面这条语句的，要注意把form传入，jinja2才可以对表单进行渲染。
    return render_template('auth/login.html', form=form)

It is also the content of the book "Flask Web Development: Practical Web Application Development Based on Python". I reviewed it again today~Haha, so if you want to learn Flask, I recommend reading this book~ Any questions? Welcome to continue to ask questions, thank you~~

Answer 3

Use request context

from flask import request

# ...

user = User.query.filter_by(User.id==request.args.get('id', 0))