使用烧瓶从选择标签获得价值 [英] Getting value from select tag using flask

查看:171
本文介绍了使用烧瓶从选择标签获得价值的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

我是Flask的新手,无法从我的选择标签获取值。我已经尝试了 request.form ['comp_select'] ,它返回一个错误的请求。然而,当我尝试使用 request.form.get('comp_select')时,我的返回页面返回一个空白列表[]。



我的html:
$ b

 < ; form class =form-inlineaction ={{url_for('test')}}> 
< div class =form-group>
< div class =input-group>
< span class =input-group-addon>请选择< / span>
{%for o in data%}


I'm new to Flask and I'm having trouble getting the value from my select tag. I have tried request.form['comp_select'] which returns a Bad Request. However, when I try using request.form.get('comp_select'), my return page returns a blank list "[]".

My html:

<form class="form-inline" action="{{ url_for('test') }}">
  <div class="form-group">
    <div class="input-group">
        <span class="input-group-addon">Please select</span>
            <select name="comp_select" class="selectpicker form-control">
              {% for o in data %}
              <option value="{{ o.name }}">{{ o.name }}</option>
              {% endfor %}                                              
            </select>
    </div>
    <button type="submit" class="btn btn-default">Go</button>
  </div>
</form>

My app.py:

@app.route("/test" , methods=['GET', 'POST'])
def test():
    select = request.form.get('comp_select')
    return(str(select)) # just to see what select is

Sorry in advance if my formatting is off for the post (also new to Stack Overflow).

解决方案

It's hard to know for certain from what you've provided, but I believe you need to add method="POST" to your <form> element.

From the flask doc for the request object:

To access form data (data transmitted in a POST or PUT request) you can use the form attribute. ... To access parameters submitted in the URL (?key=value) you can use the args attribute.

So, if you submit your forms via POST, use request.form.get(). If you submit your forms via GET, use request.args.get().

This app behaves the way you want it to:

flask_app.py:

#!/usr/bin/env python
from flask import Flask, flash, redirect, render_template, \
     request, url_for

app = Flask(__name__)

@app.route('/')
def index():
    return render_template(
        'index.html',
        data=[{'name':'red'}, {'name':'green'}, {'name':'blue'}])

@app.route("/test" , methods=['GET', 'POST'])
def test():
    select = request.form.get('comp_select')
    return(str(select)) # just to see what select is

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

templates/index.html

<form class="form-inline" method="POST" action="{{ url_for('test') }}">
  <div class="form-group">
    <div class="input-group">
        <span class="input-group-addon">Please select</span>
            <select name="comp_select" class="selectpicker form-control">
              {% for o in data %}
              <option value="{{ o.name }}">{{ o.name }}</option>
              {% endfor %}
            </select>
    </div>
    <button type="submit" class="btn btn-default">Go</button>
  </div>
</form>

这篇关于使用烧瓶从选择标签获得价值的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

查看全文
登录 关闭
扫码关注1秒登录
发送“验证码”获取 | 15天全站免登陆