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I have a two dimensional array name:final_draft_arr and I am looping through each element of this array and calling a function name:getFileContentAsBase64 with each element of the array. The function is asynchronous and the for is finish before the function is executed properly for each element. How to solve this asynchronous behavior. I want the function to execute before the loop goes to its next iteration. The codes are given below.

    getFileContentAsBase64:async function(path,callback){

        await window.resolveLocalFileSystemURL(path, gotFile);                  

        function gotFile(fileEntry) {

          fileEntry.file(function(file) {

               var reader = new FileReader();

               reader.onloadend = function(e) {

                 var content = this.result;

                 callback(content);

                };

                  reader.readAsDataURL(file);

         });

       }

     },



    base64ToBlob:function(base64, mime) { 

        mime = mime || '';

        var sliceSize = 1024;

        var byteChars = window.atob(base64);

        var byteArrays = ;



        for (var offset = 0, len = byteChars.length; offset < len; offset += sliceSize) {

            var slice = byteChars.slice(offset, offset + sliceSize);

            var byteNumbers = new Array(slice.length);

            for (var i = 0; i < slice.length; i++) {

                byteNumbers[i] = slice.charCodeAt(i);

            }

            var byteArray = new Uint8Array(byteNumbers);

            byteArrays.push(byteArray);

        }

        return new Blob(byteArrays, {type: mime});

    }, 



  //this is the loop

   var final_draft_arr = JSON.parse(retrievedData);

   $.each(final_draft_arr, function(key, value){

      var i_dat = new FormData();                                                                                                               

      var data_id_no = final_draft_arr[key][0];                                                                                                         

      var sub_arr_len = final_draft_arr[key].length;

      for(j=1; j < sub_arr_len; j++){                                                

         getFileContentAsBase64(final_draft_arr[key][j],function(base64Image){

            var base64ImageContent = base64Image.replace(/^data:image/jpeg;base64,/, ""); 

            var blob_new = base64ToBlob(base64ImageContent, 'image/png');                                                                     

            i_dat.append('Bilder', blob_new);



        });                                                 

     }



  });

Use async function as a callback and await the asynchronous function call.

$.each(final_draft_arr, async function(key, value){

  var i_dat = new FormData();                                                                                                               

  var data_id_no = final_draft_arr[key][0];                                                                                                         

  var sub_arr_len = final_draft_arr[key].length;

  for(j=1; j < sub_arr_len; j++){                                                

     await getFileContentAsBase64(final_draft_arr[key][j],function(base64Image){

        var base64ImageContent = base64Image.replace(/^data:image/jpeg;base64,/, ""); 

        var blob_new = base64ToBlob(base64ImageContent, 'image/png');                                                                     

        i_dat.append('Bilder', blob_new);



    });                                                 

 }

});