javascript - FileReaderSync.ReadAsText() takes long time to read and no callback -


i trying read big text file using filereadersync , therefore logic has been implemented below : 

// entry file validated before    var result = reader.readastext(entryfile.file());    // @ point result not filled yet   // therefore on next line parsing json throwing error     return json.parse(result);

the problem result not filled few seconds, , therefore throws exception, tried onload or onloadended events there these events not fired (probably not supported ?)

anyone knows how possible continue process after read completed ?


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