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JQuery DOM Manipulation And LocalStorage

index.html

<html>
    <head>
        <title>jQuery Table</title>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <script src="js/jquery.js"></script>
        <script>
            var tblRecord = [];
            $(document).ready(function () {

                createTableRow();

                $("#save").click(function () {
                    var fname = $("#fname").val();
                    var sub = $("#sub").val();
                    var mark = $("#mark").val();
                    /*
                     var tblObj = {};
                     tblObj.fname = fname;
                     tblObj.sub = sub;
                     tblObj.mark = mark;
                     */
                    var tblObj = {fname: fname, sub: sub, mark: mark};
                    tblRecord.push(tblObj);

                    console.log(tblRecord);
                    //convert js object to json string
                    localStorage.tblData = JSON.stringify(tblRecord);
                    createTableRow();

                });
            });

            //function createTableRow(){}
            var createTableRow = function () {
                //convert json string to js object
                if (localStorage.tblData) {
                    tblRecord = JSON.parse(localStorage.tblData);
                    $("tbody").empty();
                    for (var i = 0; i < tblRecord.length; i++) {

                        var fname = tblRecord[i].fname;
                        var sub = tblRecord[i].sub;
                        var mark = tblRecord[i].mark;

                        var tblrow = "<tr><td>" + (i + 1) + "</td><td>"
                                + fname + "</td><td>"
                                + sub + "</td><td>"
                                + mark + "</td></tr>";

                        $("tbody").append(tblrow);
                    }
                }

                $("#fname").val("");
                $("#sub").val("");
                $("#mark").val("");
            };

        </script>
        <style>
            .container{
                width: 900px;
                margin: 0 auto;
                min-height: 800px;
                background-color: #ffcccc;
            }

            .formbox{
                margin: 10px;

            }

            label{
                padding-top: 10px;
                width: 100px;
                display: block;
            }

            input{
                width: 100%;
                height: 30px;
            }
            table{
                margin: 0 auto;
            }

            th{
                width: 100px;
                padding: 10px;
                border: 1px solid;
            }

            td{
                width: 100px;
                padding: 10px;
                border: 1px solid;
                background-color: cornsilk; 
            }
        </style>
    </head>
    <body>
        <div class="container">
            <div class="formbox">
                <label for="fname">Name</label>
                <input type="text" placeholder="Enter name" id="fname" name="fname">
            </div>
            <div class="formbox">
                <label for="sub">Subject</label>
                <input type="text" placeholder="Enter Subject" id="sub" name="sub">
            </div>
            <div class="formbox">
                <label for="mark">Mark</label>
                <input type="text" placeholder="Enter Mark" id="mark" name="mark">
            </div>
            <div class="formbox">
                <label for="save"></label>
                <button id="save">Save</button>
            </div>

            <table>
                <thead>
                    <tr>
                        <th>Sl</th>
                        <th>Name</th>
                        <th>Subject</th>
                        <th>Mark</th>
                    </tr>
                </thead>
                <tbody>

                </tbody>

            </table>
        </div>
    </body>
</html>

Editable Table addon

(updated)index.html

<html>
    <head>
        <title>TODO supply a title</title>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <script src="js/jquery.js"></script>    
        <style>
            .container{
                width: 900px;
                margin: 0 auto;
                min-height: 800px;
                background-color: #ffcccc;
            }

            .formbox{
                margin: 10px;

            }

            label{
                padding-top: 10px;
                width: 100px;
                display: block;
            }

            input{
                width: 100%;
                height: 30px;
            }
            table{
                margin: 0 auto;
            }

            th{
                width: 100px;
                padding: 10px;
                border: 1px solid;
            }

            td{
                width: 100px;
                padding: 10px;
                border: 1px solid;
                background-color: cornsilk; 
            }
        </style>
    </head>
    <body>
        <div class="container">
            <div class="formbox">
                <label for="fname">Name</label>
                <input type="text" placeholder="Enter name" id="fname" name="fname" >
            </div>
            <div class="formbox">
                <label for="sub">Subject</label>
                <input type="text" placeholder="Enter Subject" id="sub" name="sub" >
            </div>
            <div class="formbox">
                <label for="mark">Mark</label>
                <input type="text" placeholder="Enter Mark" id="mark" name="mark" >
            </div>
            <div class="formbox">
                <label for="save"></label>
                <button id="save">Save</button>
            </div>

            <table>
                <thead>
                    <tr>
                        <th>Sl</th>
                        <th>Name</th>
                        <th>Subject</th>
                        <th>Mark</th>
                    </tr>
                </thead>
                <tbody>

                </tbody>

            </table>
        </div>
        <script>
            var tblRecord = [];
            $(document).ready(function () {

                createTableRow();

                $("#save").click(function () {
                    var fname = $("#fname").val();
                    var sub = $("#sub").val();
                    var mark = $("#mark").val();

                    var tblObj = {fname: fname, sub: sub, mark: mark};
                    tblRecord.push(tblObj);
                    //tblObj[fname];

                    console.log(tblRecord);
                    //convert js object to json string
                    localStorage.tblDataEditable = JSON.stringify(tblRecord);
                    createTableRow();

                });
            });

            var createTableRow = function () {
                //convert json string to js object
                if (localStorage.tblDataEditable) {
                    tblRecord = JSON.parse(localStorage.tblDataEditable);
                    $("tbody").empty();
                    for (var i = 0; i < tblRecord.length; i++) {

                        var fname = tblRecord[i].fname;
                        var sub = tblRecord[i].sub;
                        var mark = tblRecord[i].mark;

                        var tblrow = "<tr><td>" + (i + 1) + "</td><td onclick=\"onCellClick($(this)," + i + ",‘fname’)\">"
                                + fname + "</td><td onclick=\"onCellClick($(this)," + i + ",‘sub’)\">"
                                + sub + "</td><td onclick=\"onCellClick($(this)," + i + ",‘mark’)\">"
                                + mark + "</td></tr>";

                        $("tbody").append(tblrow);
                    }
                }

                $("#fname").val("");
                $("#sub").val("");
                $("#mark").val("");
            };

            function onCellClick(target, index, key) {
                // console.log(target.innerHTML); // JS this keyword
                if (target[0].textContent) {
                    console.log(target[0].textContent);
                    var textContent = target[0].textContent;
                    var inputField = jQuery("<input type=\"text\" value=\"" + textContent + "\">");
                    inputField.blur(function (e) {
                        console.log("Lost focus");
                        //target.html(inputField.val());
                        (tblRecord[index])[key] = inputField.val();
                        localStorage.tblDataEditable = JSON.stringify(tblRecord);
                        createTableRow();
                    });
                    inputField.keypress(function (e) {
                        console.log(e);
                        if (e.keyCode === 13) {
                            //Enter pressed
                            //target.html(inputField.val());
                            (tblRecord[index])[key] = inputField.val();
                            localStorage.tblDataEditable = JSON.stringify(tblRecord);
                            createTableRow();
                        }
                    });
                    target.html(inputField);
                    inputField.focus();

                }

            }

        </script>
    </body>
</html>

HTML5

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