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Shopping List Using LocalStorage

index.html

<html>
    <head>
        <title>Shopping List</title>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <link href="jquery.mobile-1.4.4/jquery.mobile-1.4.4.min.css" rel="stylesheet" />
        <script src="jquery.mobile-1.4.4/demos/js/jquery.min.js" ></script>
        <script src="jquery.mobile-1.4.4/jquery.mobile-1.4.4.min.js" ></script>
    </head>
    <body>
        <div data-role="page" id="mainpage">
            <div data-role="header" data-position="fixed">
                <a href="#panel1" data-icon="bars" data-iconpos="notext">Menu</a>
                <h1>Shopping List</h1>
            </div>
            <div data-role="main" class="ui-content">
                <ul data-role="listview" id="products">

                </ul>
            </div>
            <div data-role="footer" data-position="fixed">
                <h1>Copyrights 2014</h1>
            </div>
            <div data-role="panel" id="panel1" data-theme="b">
                <ul data-role="listview">
                    <li><a href="javascript:openProductPage()" >Add Item</a></li>
                    <li><a href="" >My Account</a></li>
                    <li><a href="" >Contact</a></li>
                    <li><a href="" >About</a></li>
                </ul>
            </div>
        </div>
        <script>
            //additionial script
            var items = [];
            loadItemsFromStorage();

            $(document).on("pagebeforechange", function(event, data) {
                if (data.toPage[0].id === "addproductpage") {
                    var itemInfo = data.options.item;
                    console.log(itemInfo.itemname);
                    $("#itemname").val(itemInfo.itemname);
                    $("#itemqty").val(itemInfo.itemqty);
                    $("#itemdesc").val(itemInfo.itemdesc);
                    $("#itemid").val(itemInfo.itemid);
                    if (itemInfo.itemid === -1) {
                        $("#updatebtn").hide();
                        $("#del").hide();
                        $("#savebtn").show();
                    } else {
                        $("#updatebtn").show();
                        $("#del").show();
                        $("#savebtn").hide();
                    }
                }

            });

            function loadItemsFromStorage() {
                var s = localStorage.shoppingItemsAll;
                if (s) {
                    // already existing
                    var jsonString = localStorage.shoppingItemsAll;
                    items = JSON.parse(jsonString);
                    for (var i = 0; i < items.length; i++) {
                        $("#products").append(
                                '<li><a href="javascript:retriveItem(' +
                                items[i].itemid + ')">' + items[i].itemname +
                                '</a></li>'
                                );
                    }
                }
                //to clear localStorage
                //localStorage.shoppingItemsAll = "";
            }
            function openProductPage() {
                var obj = {
                    itemid: -1,
                    itemname: "",
                    itemqty: "",
                    itemdesc: "",
                    itemdate: ""
                };
                $.mobile.pageContainer.pagecontainer("change", "addproduct.html", {item: obj, transition: "slide"});
            }
            function saveProduct() {
                var itemName = $("#itemname").val();
                var itemQty = $("#itemqty").val();
                var itemDesc = $("#itemdesc").val();
                var itemDate = new Date().toString();
                var itemId = Math.random();
                var obj = {
                    itemid: itemId,
                    itemname: itemName,
                    itemqty: itemQty,
                    itemdesc: itemDesc,
                    itemdate: itemDate
                };
                items.push(obj);
                // Adds the new item at the end of ul listivew
                $("#products").append(
                        '<li><a href="javascript:retriveItem(' + itemId + ')">' + itemName + '</a></li>'
                        );
                $("#products").listview("refresh");
                localStorage.shoppingItemsAll = JSON.stringify(items);
                $.mobile.back();
            }

            function retriveItem(itemId) {
                for (var i = 0; i < items.length; i++) {
                    if (items[i].itemid === itemId) {
                        var selectedObj = items[i];
                        $.mobile.pageContainer.pagecontainer("change", "addproduct.html", {item: selectedObj, transition: "flip"});
                        console.log("Item found:" + selectedObj.itemname);
                        break;
                    }
                }
            }

            function findIndexOfItemId(itemid) {
                for (var i = 0; i < items.length; i++) {
                    console.log(items[i].itemid + ", match with " + itemid);

                    if (items[i].itemid === parseFloat(itemid)) {
                        console.log(items[i].itemid + ", match found");
                        return i;

                    }
                }
                return -1;
            }

            function updateProduct() {
                var itemId = $("#itemid").val();
                var itemName = $("#itemname").val();
                var itemQty = $("#itemqty").val();
                var itemDesc = $("#itemdesc").val();
                var itemDate = new Date().toString();
                var i = findIndexOfItemId(itemId);
                console.log("Index is " + i);
                var obj = {
                    itemid: parseFloat(itemId),
                    itemname: itemName,
                    itemqty: itemQty,
                    itemdesc: itemDesc,
                    itemdate: itemDate
                };
                items.splice(i, 1, obj);

                localStorage.shoppingItemsAll = JSON.stringify(items);
                $("#products").html("");
                for (var i = 0; i < items.length; i++) {
                    $("#products").append(
                            '<li><a href="javascript:retriveItem(' + items[i].itemid + ')">' + items[i].itemname + '</a></li>'
                            );
                }
                $("#products").listview("refresh");
                $.mobile.back();

            }

            function deleteProduct() {
                var itemId = $("#itemid").val();

                var i = findIndexOfItemId(itemId);
                console.log("Index is " + i);

                items.splice(i, 1);

                localStorage.shoppingItemsAll = JSON.stringify(items);
                $("#products").html("");
                for (var i = 0; i < items.length; i++) {
                    $("#products").append(
                            '<li><a href="javascript:retriveItem(' + items[i].itemid + ')">' + items[i].itemname + '</a></li>'
                            );
                }
                $("#products").listview("refresh");
                $.mobile.back();

            }

        </script>
    </body>
</html>

addproduct.html

<div data-role="page" id="addproductpage">
    <div data-role="header" data-position="fixed">
        <a href="#" data-rel="back" data-icon="back" 
           data-iconpos="notext">Back</a>
        <h1>Add Item</h1>
        <a href="javascript:deleteProduct()" id="del" data-icon="delete" 
           >Delete</a>
    </div>
    <div data-role="main">
        <div style="padding: 10px">

            <input type="text" placeholder="Itemid" id="itemid" readonly >
            <label for="itemname">Item Name</label>
            <input type="text" placeholder="item name here" id="itemname" >
            <label for="itemqty">Item Qty</label>
            <input type="number" placeholder="item qty" id="itemqty" value="1">
            <label for="itemdesc">Item Description</label>
            <textarea rows="6" id="itemdesc"></textarea>
            <button onclick="saveProduct()" id="savebtn">Save</button>
            <button onclick="updateProduct()" id="updatebtn">Update</button>
        </div>
    </div>
    <div data-role="footer" data-position="fixed">
        <h1>Copyrights 2014</h1>
    </div>
</div>

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