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Send a form array input to Flask


The following example shows, how send HTML form array input to Flask using jQuery Ajax.

The following HTML form has array input elements.

<input type='text' name='contact[]' class='cnt'> 
<input type='text' name='contact[]' class='cnt'> 
<input type='text' name='contact[]' class='cnt'> 
<input type='text' name='contact[]' class='cnt'> 
<input type='text' name='contact[]' class='cnt'> 
<input type='button' id='saveBtn' value='Click'>

We have to send form inputs to Flask using jQuery Ajax

$("#saveBtn").click(function(){
  var arr=[];
  $(".cnt").each(function(){
    arr.push($(this).val());
  });
  $.ajax({
    url:'{{url_for("array_post")}}',
    type:'post',
    data:{contacts:arr},
    success:function(res){}
  });
});

Receive form post data in Flask 

@app.route("/array_post",methods=['GET','POST'])
def array_post():
  if request.method=='POST':
    a=request.form.getlist("contacts[]")
    for x in a:
      print(x)
  return ""