falsk 下拉框（自动获取默认数据）与输入框案例及数据提交接收
入口页 app.py
from flask import Flask, render_template, request
from flask_paginate import Pagination, get_page_parameter
# from elasticsearch import Elasticsearch
from itertools import zip_longestapp = Flask(__name__)# es = Elasticsearch()@app.route('/')
def indices():indices = ["q","e","d"] ##魔力后台处理得到下拉框展示内容# Render the templatereturn render_template('index.html', indices=indices)@app.route('/search', methods=['POST'])
def search():# Render the templatereturn "hello"if __name__ == '__main__':app.run(debug=True)前端
index.html
<!-- 这是 HTML 的注释 -->
<!DOCTYPE html>
<html><head><!-- Import Bootstrap CSS -->
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.0/css/bootstrap.min.css" integrity="sha384-9aIt2nRpC12Uk9gS9baDl411NQApFmC26EwAOH8WgZl5MYYxFfc+NcPb1dKGj7Sk" crossorigin="anonymous"></head><body style="margin: 50px;">
<!-- Dropdown menu with a list of indices -->
<!-- <form method="get" action="{{ url_for('search') }}"> -->
<form action="/search" method="post"><div class="form-group"><label for="index">Index</label><select class="form-control" name="index" id="index">{% for index in indices %}<option value="{{ index }}">{{ index }} </option>{% endfor %}</select></div><div class="form-group"><label for="query">Query</label><!-- <input type="text" class="form-control" name="query" id="query"> --><textarea class="form-control input-lg" name="query" id="query"></textarea></div><!-- Other form elements --><button type="submit" class="btn btn-primary">Search</button>
</form><!-- Import Bootstrap JavaScript -->
<script src="https://code.jquery.com/jquery-3.5.1.slim.min.js" integrity="sha384-DfXdz2htPH0lsSSs5nCTpuj/zy4C+OGpamoFVy38MVBnE+IbbVYUew+OrCXaRkfj" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/@popperjs/core@2.16.0/dist/umd/popper.min.js" integrity="sha384-cE4Z1KWZL8BZJfIyO5DY7S8W1+OJ7hZ0d5+RKzWU6G2v6g3C3ejKfVuws8pwv7Vz" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.5.0/js/bootstrap.min.js" integrity="sha384-OgVRvuATP1z7JjHLkuOU7Xw704+h835Lr+6QL9UvYjZE3Ipu6Tp75j7Bh/kR0JKI" crossorigin="anonymous"></script></body>
</html>
下拉框（自动获取默认数据）与输入框上传的数据，flask获取接收处理
from flask import request@app.route('/submit', methods=['POST'])
def submit():dropdown_value = request.form['index']textarea_value = request.form['query']# 处理数据...return 'Success'
textarea 如果无数据提交默认上传placeholder 默认的值
用js来控制
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