Use jQuery .on for dynamic future event not working for me -

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i have dynamic form every post reply. using $('.upload_reply').on('submit', function(e){ . par jquery documentation future event should use 1 below not work me: 

$(document).on('submit', '.upload_repimg',function (e){ //also tried $("body").delegate('.upload_repimg', 'submit', function(){

if use these, page refreshed without submitting form.

and if use current way, reply work 1st reply. means in case of 2 or more reply @ time, reply submit 1st one, next try, page refresh.

where problem please.

my form

<form class="upload_reply" method="post" id="up_rep'.$sid.'" enctype="multipart/form-data">     <input type="file" name="file" class="repfile" id="'.$sid.'" value="" />      <input type="submit" class="upload_repimg" id="'.$sid.'" name="upload_btn" value="upload picture"/> </form>

.upload_reply form submit, .upload_repimg thing click. suggest former: $(document).on('submit', '.upload_reply',function (e){


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