html - Sync a FileReader in a for loop: Javascript -


i trying implement javascript program read bunch of csv files particular directory containing sub-directories. so, thinking of using javascript read multiple files using webkitdirectory , reading files , using java push them.

html form

<input id="csv" type="file" multiple webkitdirectory directory> <input type="button" onclick="readcsv()" value="submit">

javascript read files

function readcsv(){     var fileinput = document.getelementbyid("csv");     var filecount = fileinput.files.length;     if( filecount != 0) {         alert(filecount);         var reader;         (var = 0; < filecount; i++) {             reader = new filereader();             reader.onload = function ()  {                 document.getelementbyid('out').innerhtml = reader.result;                // once file read, send javaservlet save on server.             };             reader.readasbinarystring(fileinput.files[i]);         }     } else {         alert("select file");     } }

the problem facing here code runs when 1 file selected breaks when multiple files selected. think problem in sync read. couldn't find way either sync read or pause loop while reader object reads file.


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