Auto Preview Image in Javascript or Php -

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i've tried many times solve problem, , yet not able solve it. search on google unfortunately, codes not running, sample codes searched on google.

<div id='preview'></div>     <form id="imageform" method="post" enctype="multipart/form-data" action='index.php'>     <input type="file" name="photoimg" id="photoimg" />       </form>   <script type ="text/javascript"> $('#photoimg').on('change', function()   {       $("#imageform").ajaxform({target: '#preview', //shows response image in div named preview           success:function(){           },           error:function(){            }         }).submit(); });  </script>     <?php     if(isset($_post) , $_server['request_method'] == "post") { $name = $_files['photoimg']['name']; $size = $_files['photoimg']['size']; $tmp = $_files['photoimg']['tmp_name']; $path = "uploads/"; move_uploaded_file($tmp, $path.$name); //stores image in uploads folder }  ?>

i have feature on form.

javascript: 

 function showmyimage(fileinput) {         var files = fileinput.files;         (var = 0; < files.length; i++) {                        var file = files[i];             var imagetype = /image.*/;                  if (!file.type.match(imagetype)) {                 continue;             }                        var img=document.getelementbyid("thumbnail");                         img.file = file;                 var reader = new filereader();             reader.onload = (function(aimg) {                  return function(e) {                      aimg.src = e.target.result;                  };              })(img);             reader.readasdataurl(file);         }         }

the code:

<input name="file[]" id="file[]" type="file" onchange="showmyimage(this)" required> <div class="img"> <img id="thumbnail" style="max-width:120px;max-height:120px;"  src="" alt="no main image inputted"/> </div>

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