使用flask和python从html表单获取表单数据 [英] Getting form data from html form using flask and python

问题描述

当按下提交按钮时，我试图从表单数据中取出表单数据，所以我可以把它放入json格式，并以另一个页面的形式访问json数据，这个页面应该是 localhost：5000 /信息。每次我尝试使用 request.form.get（'< id>）访问数据时，它只返回一个空字典。我读了stackoverflow上的其他职位试图找出问题，但没有解决方案似乎工作。如果可能的话，我想避免使用模板或模块以外的瓶子。

这是我的Python代码

< pre $ 从瓶子导入烧瓶，请求，jsonify，重定向

app =烧瓶（__ name__）

numCarsEast =无
numCarsWest = None
numCarsSouth = None
numCarsNorth = None


@ app.route（'/ info.json'，methods = ['GET'，'POST '））
def getInfo（）：$ b $如果request.method =='GET'：
lightEast = {}
lightWest = {}
lightNorth = {}
lightSouth = {}
intersection1 = {}
lightEast ['cars'] = numCarsEast
lightWest ['cars'] = numCarsWest
lightNorth ['cars'] = numCarsNorth
lightSouth ['cars'] = numCarsSouth
intersection1 ['eastLight'] = lightEast
intersection1 ['westLight'] = lightWest
intersection1 ['northLight'] = lightNorth
intersection1 ['southLight'] = lightSouth
返回jsonify（intersection = intersection1）

@ app.route（'/ cars'，methods = ['GET'，'POST '））
def cars（）：
if request.method =='POST'：
numCarsEast = request.form.get（'eastLightInt1'，None）
numCarsWest = request.form.get（'westLightInt1'，None）
numCarsNorth = request.form.get（'northLightInt1'，None）
numCarsSouth = request.form.get（'southLightInt1'，None）
print（str（numCarsNast）+'north'）
print（str（numCarsWest）+'west'）
print（str（numCarsNorth）+'north'）
print （numCarsSouth）+'south'）
return'done'
return open（'./carForm.html'）。read（）
$ b $ if if __name__ =='__main__' ：
app.debug = True
app.run（）


HTML

 < body> 
< form method ='POST'> 
< H2> 
十字路口1 
  
< label> 
 East Light 
< / label> 
< input type = text id ='eastLightInt1'name ='eastLightInt1'/> 
< label> 
 West Light 
< / label> 
< input type = text id ='westLightInt1'name ='westLightInt1'/> 
< br /> 
< label> 
北极光
< / label> 
< input type = text id ='northLightInt1'name ='northLightInt1'/> 
< label> 
南灯
< / label> 
< input type = text id ='southLightInt1'name ='southLightInt1'/> 
< br /> 
< input type = submit value = Submit> 
< / form> 
< / body> 
  

解决方案

我试过你的代码，它适用于我。 / p>

我只需在 cars（）中添加 global 在 /info.json

$ b $

  def cars（） ：
 global numCarsEast，numCarsWest，numCarsSouth，numCarsNorth 
  

I am trying to get the form data out of the text fields when the submit is pressed so I can put it into json format and access the json data as another page which would be localhost:5000/info. Every time I try to access the data with request.form.get('<id>') it only returns an empty dictionary. I read the other posts on stackoverflow trying to figure out the problem but none of the solutions seem to work. If possible I would like to avoid having to use templates or modules other than flask.

This is my python code

from flask import Flask, request, jsonify, redirect

app = Flask(__name__)

numCarsEast = None
numCarsWest = None
numCarsSouth = None
numCarsNorth = None


@app.route('/info.json', methods=['GET', 'POST'])
def getInfo():
    if  request.method == 'GET':
        lightEast = {}
        lightWest = {}
        lightNorth = {}
        lightSouth = {}
        intersection1 = {}
        lightEast['cars'] = numCarsEast
        lightWest['cars'] = numCarsWest
        lightNorth['cars'] = numCarsNorth
        lightSouth['cars'] = numCarsSouth
        intersection1['eastLight'] = lightEast
        intersection1['westLight'] = lightWest
        intersection1['northLight'] = lightNorth
        intersection1['southLight'] = lightSouth
        return jsonify(intersection=intersection1)

@app.route('/cars', methods=['GET', 'POST'])
def cars():
    if request.method == 'POST':
        numCarsEast = request.form.get('eastLightInt1', None)
        numCarsWest = request.form.get('westLightInt1', None)
        numCarsNorth = request.form.get('northLightInt1', None)
        numCarsSouth = request.form.get('southLightInt1', None)
        print(str(numCarsEast) + ' east')
        print(str(numCarsWest) + ' west')
        print(str(numCarsNorth) + ' north')
        print(str(numCarsSouth) + ' south')
        return 'done'
    return open('./carForm.html').read()

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

This is the HTML

<body>
    <form method='POST'>
        <H2>
            Intersection 1
        </h2>
        <label>
            East Light
        </label>
        <input type=text id='eastLightInt1' name='eastLightInt1' />
        <label>
            West Light
        </label>
    <input type=text id='westLightInt1' name='westLightInt1' />
    <br />
    <label>
      North Light
    </label>
    <input type=text id='northLightInt1' name='northLightInt1' />
    <label>
      South Light
    </label>
    <input type=text id='southLightInt1' name='southLightInt1' />
    <br />
    <input type=submit value=Submit>
  </form>
  </body>

解决方案

I tried your code and it works for me.

I only had to add global in cars() to get results on page /info.json

def cars():
    global numCarsEast, numCarsWest, numCarsSouth, numCarsNorth

这篇关于使用flask和python从html表单获取表单数据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！