How to get the particular element of row of a csv file using javascript

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Javascript

HTML

jQuery

Hello friends,
I am trying to get elements of a csv file using javascript. Actually I want to upload file to database.For this, I need single element. Now I am getting elements of first row only. I need elements of all the rows. Below is my code ...

$(document).ready(function() {
    // Checking all the possible window objects needed for file api
    if (window.File && window.FileReader && window.FileList && window.Blob) {
        // Browser is fully supportive.
        //  alert("Supported");
    } else {
        // Browser not supported. Try normal file upload
        //  alert("Not Supported");
    }

    $("#filename").change(function(e) {
        var ext = $("input#filename").val().split(".").pop().toLowerCase();
        alert(ext);
        if($.inArray(ext, ["csv"]) == -1) {
            alert('Upload CSV');
            return false;
        }

        if (e.target.files != undefined) {
            var reader = new FileReader();
            reader.onload = function(e) {
                var csvval=e.target.result.split("\n");
                alert(e.target.result);
                alert(e.target.result.length);
                           
                for(var i=0;i<csvval.length;i++) {
                    var csvvalue=csvval[i].split(",");
                    for(var i=0;i<csvvalue.length;i++) {
                        alert('Line ' + i + ' value :' + csvvalue[i]);
                    }
                }

                $("#csvimporthint").html(inputrad);
                $("#csvimporthinttitle").show();
            };
            reader.readAsText(e.target.files.item(0));
        }
    });
});