使用flask和python从html表单获取表单数据

Question

我正在尝试在按下submit时从文本字段中获取表单数据，以便将其放入json格式并作为另一个页面访问json数据，该页面将是localhost:5000/info。每次我试图用request.form.get('<id>')访问数据时，它只返回一个空字典。我阅读了stackoverflow上的其他帖子，试图找出问题所在，但似乎没有一个解决方案有效。如果可能的话，我想避免使用模板或模块以外的烧瓶。在

这是我的python代码

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()

这是HTML

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Answer 1

我试过你的代码，对我有用。在

我只需要在cars()中添加global就可以得到第/info.json页的结果

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