flask 与 vue.js 2.0 实现 todo list

两个文件

from flask import Flask, jsonify, render_template
from flask_sqlalchemy import SQLAlchemy

app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite://'
app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = True
db = SQLAlchemy(app)

# 定义ORM
class Todo(db.Model):
id = db.Column(db.Integer, primary_key=True)
title = db.Column(db.String(80), unique=True)
description = db.Column(db.String(120), unique=True)
done = db.Column(db.Boolean)

def __init__(self, title, description, done):
self.title = title
self.description = description
self.done = done

def __repr__(self):
return '<Todo %r>' % self.title

# 创建表格、插入数据
@app.before_first_request
def create_db():
# Recreate database each time for demo
#db.drop_all()
db.create_all()

tasks = [Todo('Buy groceries', 'Milk, Cheese, Pizza, Fruit, Tylenol', False),
Todo('Learn Python', 'Need to find a good Python tutorial on the web', False),
Todo('Mow the lawn', 'Find out some tools', False)]
db.session.add_all(tasks)
db.session.commit()

# ==================================
# 下面是RESTful api
# ==================================

@app.route('/')
def index():
return render_template('formdata_vue.html')

# ==================================
# 下面是RESTful api
# ==================================

# 辅助函数
from flask import url_for
def replace_id_to_uri(task):
return dict(uri = url_for('get_task', task_id=task.id, _external=True),
title = task.title,
description = task.description,
done = task.done)

# 查询全部
@app.route('/todo/api/v1.0/tasks/', methods=['GET'])
def get_tasks():
tasks = Todo.query.all()
return jsonify({'tasks': list(map(replace_id_to_uri, tasks))})

# 查询一个
from flask import abort
@app.route('/todo/api/v1.0/tasks/<int:task_id>', methods=['GET'])
def get_task(task_id):
task = Todo.query.filter_by(id=task_id).first()
if task is None:
abort(404)

return jsonify({'task': replace_id_to_uri(task)})

# 添加
from flask import request
@app.route('/todo/api/v1.0/tasks/', methods=['POST'])
def create_task():
# 没有数据，或者数据缺少 title 项，返回 400，表示请求无效
if not request.json or not 'title' in request.json:
abort(400)

task = Todo(request.json['title'], request.json.get('description', ""), False)

db.session.add(task)
db.session.commit()
return jsonify({'task': replace_id_to_uri(task)}), 201

# 更新
@app.route('/todo/api/v1.0/tasks/<int:task_id>', methods=['PUT'])
def update_task(task_id):
task = Todo.query.filter_by(id=task_id).first()
if task is None:
abort(404)

if not request.json:
abort(400)
if 'title' in request.json and type(request.json['title']) != unicode:
abort(400)
if 'description' in request.json and type(request.json['description']) is not unicode:
abort(400)
if 'done' in request.json and type(request.json['done']) is not bool:
abort(400)

task['title'] = request.json.get('title', task['title'])
task['description'] = request.json.get('description', task['description'])
task['done'] = request.json.get('done', task['done'])

#db.session.update(task)
db.session.commit()
return jsonify({'task': replace_id_to_uri(task)})

# 删除
@app.route('/todo/api/v1.0/tasks/<int:task_id>', methods=['DELETE'])
def delete_task(task_id):
task = Todo.query.filter_by(id=task_id).first()
if task is None:
abort(404)

db.session.delete(task)
db.session.commit()
return jsonify({'result': True})

# 定制404出错页面
@app.errorhandler(404)
def not_found(error):
return jsonify({'error': 'Not found'}), 404

if __name__ == '__main__':
app.run(debug=True)

<meta charset="utf-8"/>

<script src="{{ url_for('static', filename='js/vue.min.js') }}"></script>
<!--
<script src="{{ url_for('static', filename='js/fetch.js') }}"></script>
-->

<div id="app">
<form v-on:submit="ajax">
<div class="form-group">
<input type="text" v-model="title" placeholder="任务标题" required="required">
</div>
<div class="form-group">
<input type="texteara" v-model="description" placeholder="任务描述" required="required">
</div>

<input type="submit" class="btn btn-default" value="添加任务">
</form>

<!-- 任务列表 -->
<ol>
<li v-for="task in tasks">
<span v-text="task.title"></span> --
<span v-text="task.description"></span> --
<span v-text="task.done"></span>
</li>
</ol>
</div>

<script>
var vm = new Vue({
el: '#app',
data: {
title: '',
description: '',
tasks: [
// {
//    uri: 'todo/api/v1.0/tasks/1',
//    title: 'waw the land',
//    description: 'do something best',
//    done: false
// }
]
},

// 事件钩子
beforeCreate: function () {
// `this` 指向 vm 实例
var _this = this; //this只能到这一层

// 原生 js 实现 ajax
var xhr = new XMLHttpRequest();
xhr.open('GET', '/todo/api/v1.0/tasks/');
xhr.send();

xhr.addEventListener('loadend', function() {
if(xhr.status == 200){
var res = JSON.parse(xhr.responseText);
console.log(res);
res["tasks"].map(function(task){_this.tasks.push(task)});
}
}, false);

// fetch 库实现 ajax
//fetch('/todo/api/v1.0/tasks/')
//.then(r => r.json())
//.then(j => {
//    console.log(j);
//    this.tasks = j.tasks; //暴力替换
//})
},

methods: {
ajax: function(event){
event.preventDefault();

var _this = this; //this只能到这一层

var payload = {
title: _this.title,
description: _this.description
};
console.log(payload);

// 原生 js 实现 ajax
var xhr2 = new XMLHttpRequest();
xhr2.open('POST', '/todo/api/v1.0/tasks/');
xhr2.setRequestHeader('Content-Type', 'application/json');
xhr2.send(JSON.stringify(payload));// 发送json数据！

xhr2.addEventListener('loadend', function() {
if(xhr2.status == 201){ // 注意，这里是201，与后台一致！！
var res2 = JSON.parse(xhr2.responseText);
console.log(res2["task"]);
//[res2["task"]].map(function(task){_this.tasks.push(task)}); // 这里也用map，没别的目的，只想与前面的形式一致
_this.tasks.push(res2["task"]); //动作温柔
}
}, false);

// fetch 库实现 ajax
//fetch('/todo/api/v1.0/tasks/', {
//    method: 'POST',
//    headers: {
//        'Content-Type': 'application/json'
//    },
//    body: JSON.stringify(payload)
//})
//.then(r => r.json())
//.then(j => {
//    console.log(j);
//[j.task].map(function(task){_this.tasks.push(task)});
//    _this.tasks.push(j.task); //动作温柔
//})
}
}
});

</script>

效果图