使用 AJAX 将 JSON 数据传递到 Flask 服务器？ [复制]

Question

我有一些由前端在 JQuery 中生成的数组。

Edit1（基于 Edgar Henriquez 的回答）：

my_jq.js：

var a = ['one','two'];
var b = ['three','four'];
var c = ['five'];
var d = ['six','seven','eight']; 
var e = ['nine','ten','eleven'];
var newArray = [];

//jsonify to send to the server
$.ajax('/output', { 
    type: "POST",
    contentType: "application/json",
    dataType: "json",
    data: JSON.stringify(postData),
    success: function(data, status){
        console.log(newArray); 
        console.log(status);} 
 });

我将选定的值传递给服务器（Flask/python）并让它计算笛卡尔积。然后我需要在 output.html 屏幕中显示输出

@app.route('/output', methods = ['GET','POST'])
def output():
    data1 = request.get_json(force = True)
    a = data1['a']
    b = data1['b']
    c = data1['c']
    d = data1['d']
    e = data1['e']
    newArray = [a,b,c,d,e]
for element in itertools.product(*newArray):
    print(element)
    return jsonify(element)
return render_template('output.html', element = element)

输出.html：

<p>{{ element }}</p>

编辑2：

使用此代码，/output.html 会生成：

 "Bad Request
 Failed to decode JSON object: Expecting value: line 1 column 1 (char 0)"

检查显示：

 "Failed to load resource: the server responded with a status of 500 (INTERNAL SERVER ERROR)"

为什么它不识别它？

Answer 1

对于您的 jquery 代码，您可以拥有一个 JavaScript 对象（将对象的属性命名为数组变量，只是为了方便起见）。像这样的：

var a = ['one','two'];
var b = ['three','four'];
var c = ['five'];
var d = ['six','seven','eight']; 
var e = ['nine','ten','eleven'];

var postData = {
  a: a,
  b: b,
  c: c,
  d: d,
  e: e
}

$.ajax({
    url: "/output",
    type: "POST",
    contentType: "application/json",
    data: JSON.stringify(postData),
    success: function(data){/* do something */}
});

回到您的服务器，您可以执行以下操作：

@app.route('/output', methods=['POST'])
def output():
    result = []
    data = request.get_json()
    a = data['a'] #will give you array a
    b = data['b'] #will give you array b
    c = data['c'] #will give you array c
    d = data['d'] #will give you array d
    e = data['e'] #will give you array e
    newArray = [a, b, c, d, e]
    #To test you got the data do a print statement

    print(newArray)

    # The for loop is not necessary if you pass the newArray directly to 
    # your template "output.html".
    #
    #for element in newArray:
    #    result.append(element)
    #
    #like this
    return render_template('output.html', element=newArray)

您可以在output.html 中显示结果，但您认为最适合您，请记住

希望对你有帮助！