我正在尝试使用我的JavaScript文件中的ajax调用将信息（字典）从Javascript传递到Flask。
我正在CentOS7上运行Python 2.7。
Flask路由通过request.get_json（'data'）获取数据，并且字典由python拾取，因为我的控制台会打印出所请求的字典。我可以访问字典，但是我不知道为什么会收到typeError。
这是我的烧瓶代码：
# import the Flask class from the flask module
from flask import Flask, render_template, redirect, url_for, request, jsonify
import json
from ev import EventViewer
# create the application object
app = Flask(__name__, )
app.config['SEND_FILE_MAX_AGE_DEFAULT'] = 0
app.run(debug=True, host='localhost:5000')
@app.route('/')
def main():
return render_template('charts.html') # render a template
@app.route('/python_portal', methods=['GET', 'POST'])
def python_portal():
if request.method == "POST":
print 'STEP 1'
request_data = request.get_json('data')
print "query: %s" % request_data
page = request_data['page']
payload = request_data['data_to_pass']
print 'STEP 2'
print page, request_data
return "Python portal"
# start the server with the 'run()' method
if __name__ == '__main__':
app.run(debug=True)
这是我的Javascript：
function build(query){
var qu = query
console.log(qu)
$.ajax(
{
type: "POST",
async: true,
contentType: "application/json; charset=utf-8",
url: "/python_portal",
data: JSON.stringify(query),
dataType: "json",
failure: function () {
console.log("failure");
},
success: function (data) {
console.log("success");
for(i=0; i < 3; i++){
console.log(i);
};
}
})
};
$('#submit').on('click', function() {
var event_name = document.getElementById("schools").value;
var symbol_name = document.getElementById("vacations").value;
var instances = document.getElementById("instances").value;
var payload = {
"page": "project",
"data_to_pass": [event_name, symbol_name, instances]
}
build(payload)
})
这是我的html：
<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">
<!-- Load c3.css -->
<link href="https://cdnjs.cloudflare.com/ajax/libs/c3/0.7.2/c3.css" rel="stylesheet">
<link rel="stylesheet" type="text/css" href="//maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/css/bootstrap.min.css" integrity="sha384-/Y6pD6FV/Vv2HJnA6t+vslU6fwYXjCFtcEpHbNJ0lyAFsXTsjBbfaDjzALeQsN6M" crossorigin="anonymous">
<link rel="stylesheet" type="text/css" href="//cdnjs.cloudflare.com/ajax/libs/c3/0.4.10/c3.min.css"/>
<link rel="stylesheet" type="text/css" href="../static/css/style.css" >
<!-- Load d3.js and c3.js -->
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/5.9.7/d3.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/c3/0.7.2/c3.js"></script>
<script src="https://cdn.plot.ly/plotly-latest.min.js"></script>
<script src="http://code.jquery.com/jquery-latest.js"></script>
</head>
<body>
<div class="container">
<div class="row">
<div class="col-8">
<div class="form-group w-50">
<input type="text" class="form-control" id="schools" placeholder="schools" >
<input type="text" class="form-control" id="vacations" placeholder="vacations">
</div>
</div>
</div>
<div class="row">
<div class="col-2">
<div class="form-group">
<label>Instances to lookback</label>
<select class="form-control" id="instances">
<option>1</option>
<option>2</option>
<option>3</option>
<option>4</option>
<option>5</option>
</select>
</div>
</div>
</div>
<div class="row">
<div class="col-4">
<button id="submit" class="btn btn-primary btn-sm" type="submit" onclick=build('chart') >Generate</button>
<div class="spinner-border spinner-border-sm d-none text-light" role="status" aria-hidden="true" id="spin0"></div>
</div>
</div>
</div>
<div class="container">
<div class="row">
<div class="col-md-12">
<div id="event_chart"></div>
</div>
</div>
<div class="row">
<div class="col-md-6">
<div id="event_chart2"></div>
</div>
<div class="col-md-6">
<div id="event_chart3"></div>
</div>
</div>
<div class="row">
<div class="col-md-6">
<div id="event_chart4"></div>
</div>
<div class="col-md-6">
<div id="event_chart5"></div>
</div>
</div>
</div>
<script type="text/javascript" src="../static/js/chart.js"></script>
<script src="http://code.jquery.com/ui/1.10.2/jquery-ui.js" ></script>
</body>
</html>
问题是我得到
“ TypeError：字符串索引必须为整数”
在字典上。奇怪的是，尽管有这个错误，字典还是不错的，并且我可以访问（key，values）－我只是在烧瓶控制台中收到了typeError。
这是Flask控制台日志，其中显示了数据和错误：
* Restarting with stat
* Debugger is active!
* Debugger PIN: 125-816-613
STEP 1STEP 1
query: chart
query: {u'data_to_pass': [u'', u'', u'1'], u'page': u'project'}
STEP 2
project {u'data_to_pass': [u'', u'', u'1'], u'page': u'project'}
127.0.0.1 - - [12/Jul/2019 10:35:51] "POST /python_portal HTTP/1.1" 200 -
127.0.0.1 - - [12/Jul/2019 10:35:51] "POST /python_portal HTTP/1.1" 500 -
Traceback (most recent call last):
File "/data/4/dfs/eqo/env/envs/py2/lib/python2.7/site-packages/flask/app.py", line 2328, in __call__
return self.wsgi_app(environ, start_response)
File "/data/4/dfs/eqo/env/envs/py2/lib/python2.7/site-packages/flask/app.py", line 2314, in wsgi_app
response = self.handle_exception(e)
File "/data/4/dfs/eqo/env/envs/py2/lib/python2.7/site-packages/flask/app.py", line 1760, in handle_exception
reraise(exc_type, exc_value, tb)
File "/data/4/dfs/eqo/env/envs/py2/lib/python2.7/site-packages/flask/app.py", line 2311, in wsgi_app
response = self.full_dispatch_request()
File "/data/4/dfs/eqo/env/envs/py2/lib/python2.7/site-packages/flask/app.py", line 1834, in full_dispatch_request
rv = self.handle_user_exception(e)
File "/data/4/dfs/eqo/env/envs/py2/lib/python2.7/site-packages/flask/app.py", line 1737, in handle_user_exception
reraise(exc_type, exc_value, tb)
File "/data/4/dfs/eqo/env/envs/py2/lib/python2.7/site-packages/flask/app.py", line 1832, in full_dispatch_request
rv = self.dispatch_request()
File "/data/4/dfs/eqo/env/envs/py2/lib/python2.7/site-packages/flask/app.py", line 1818, in dispatch_request
return self.view_functions[rule.endpoint](**req.view_args)
File "/home/ssohn/py/projects/flask_error/app.py", line 24, in python_portal
page = request_data['page']
TypeError: string indices must be integers
答案 0 :(得分：1)
发布答案，因为这不适合评论。
根据输出，有时request.get_json('data')返回一个字符串（例如“ chart ”）。
我不知道为什么会这样，所以建议通过将函数更改为以下方法来解决该问题：
@app.route('/python_portal', methods=['GET', 'POST'])
def python_portal():
if request.method == "POST":
print 'STEP 1'
request_data = request.get_json('data')
print "query: %s" % request_data
if isinstance(request_data, (dict,)):
page = request_data['page']
payload = request_data['data_to_pass']
print 'STEP 2'
print page, request_data
return "Python portal - POST"
# ...