<!doctype html>
<html lang="en-US">
<head>
<title>HTML5 Local Storage Project</title>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<meta name="rating" content="General">
<meta name="expires" content="never">
<meta name="language" content="English, EN">
<meta name="description" content="Shopping cart project with HTML5 and JavaScript">
<meta name="keywords" content="HTML5,CSS,JavaScript, html5 session storage, html5 local storage">
<meta name="author" content="dcwebmakers.com">
<script src="Storage.js"></script>
<link rel="stylesheet" href="StorageStyle.css">
</head>
<body>
  <form name="ShoppingList">
    <fieldset>
        <legend>Shopping cart</legend>
        <label>Item: <input type="text" name="name"></label>
        <label>Quantity: <input type="text" name="data"></label>

        <input type="button" value="Save"   onclick="SaveItem()">
        <input type="button" value="Update" onclick="ModifyItem()">
        <input type="button" value="Delete" onclick="RemoveItem()">
    </fieldset>
    <div id="items_table">
        <h2>Shopping List</h2>
        <table id="list"></table>
        <label><input type="button" value="Clear" onclick="ClearAll()">
        * Delete all items</label>
    </div>
</form>
</body>
/*
=====> Checking browser support.
 //This step might not be required because most modern browsers do support HTML5.
 */
 //Function below might be redundant.
<script>

function CheckBrowser() {
    if ('localStorage' in window && window['localStorage'] !== null) {
        // We can use localStorage object to store data.
        return true;
    } else {
            return false;
    }
}
// Dynamically populate the table with shopping list items.
//Step below can be done via PHP and AJAX, too.
function doShowAll() {
    if (CheckBrowser()) {
        var key = "";
        var list = "<tr><th>Item</th><th>Value</th></tr>\n";
        var i = 0;
        //For a more advanced feature, you can set a cap on max items in the cart.
        for (i = 0; i <= localStorage.length-1; i++) {
            key = localStorage.key(i);
            list += "<tr><td>" + key + "</td>\n<td>"
                    + localStorage.getItem(key) + "</td></tr>\n";
        }
        //If no item exists in the cart.
        if (list == "<tr><th>Item</th><th>Value</th></tr>\n") {
            list += "<tr><td><i>empty</i></td>\n<td><i>empty</i></td></tr>\n";
        }
        //Bind the data to HTML table.
        //You can use jQuery, too.
        document.getElementById('list').innerHTML = list;
    } else {
        alert('Cannot save shopping list as your browser does not support HTML 5');
    }
}
function SaveItem() {

    var name = document.forms.ShoppingList.name.value;
    var data = document.forms.ShoppingList.data.value;
    localStorage.setItem(name, data);
    doShowAll();

}
function SaveItem() {
    var name = $("#name").val();
    var data = $("#data").val();
    localStorage.setItem(name, data);
    doShowAll();
}
//Change an existing key-value in HTML5 storage.
function ModifyItem() {
    var name1 = document.forms.ShoppingList.name.value;
    var data1 = document.forms.ShoppingList.data.value;
    //check if name1 is already exists

//Check if key exists.
            if (localStorage.getItem(name1) !=null)
            {
              //update
              localStorage.setItem(name1,data1);
              document.forms.ShoppingList.data.value = localStorage.getItem(name1);
            }

    doShowAll();
}
function RemoveItem()
{
var name=document.forms.ShoppingList.name.value;
document.forms.ShoppingList.data.value=localStorage.removeItem(name);
doShowAll();
}

function ClearAll() {
    localStorage.clear();
    doShowAll();
}

</script>

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About HTML

HTML(Hyper Text Markup language) is the standard markup language for Web pages, was created by Berners-Lee in the year 1991. Almost every web page over internet might be using HTML.

Syntax help

Fundamentals

  • Any HTML document must start with document declaration <!DOCTYPE html>
  • HTML documents begin with <html> and ends with </html>
  • Headings are defined with <h1> to <h6> where <h1> is the highest important heading and <h6> is the least important sub-heading.
  • Paragrahs are defined in <p>..</p> tag.
  • Links are defined in <a> tag.

    Example:

    <a href="https://onecompiler.com/html">HTML online compiler</a>
  • Images are defined in <img> tag, where src attribute consists of image name.
  • Buttons are defined in <button>..</button> tag
  • Lists are defined in <ul> for unordered/bullet list and <ol> for ordered/number list, and the list items are defined in <li>.

HTML Elements and Attributes

  • HTML element is everything present from start tag to end tag.
  • The text present between start and end tag is called HTML element content.
  • Anything can be a tagname but it's preferred to put the meaningful title to the content present as tag name.
  • Do not forget the end tag.
  • Elements with no content are called empty elements.
  • Elements can have attributes which provides additional information about the element.
  • In the below example, href is an attribute and a is the tag name.

    Example:

    <a href="https://onecompiler.com/html">HTML online compiler</a>

CSS

CSS(cascading style sheets) describes how HTML elements will look on the web page like color, font-style, font-size, background color etc.

Example:

Below is a sample style sheet which displays heading in green and in Candara font with padding space of 25px.

body{
  padding: 25px;
}
.title {
	color: #228B22;
	font-family: Candara;
}

HTML Tables

  • HTML Tables are defined in <table> tag.
  • Table row should be defined in <tr> tag
  • Table header should be defined in <th> tag
  • Table data should be defined in <td> tag
  • Table caption should be defined in <caption> tag

HTML-Javascript

  • Javascript is used in HTML pages to make them more interactive.
  • <script> is the tag used to write scripts in HTML
  • You can either reference a external script or write script code in this tag.

Example

<script src="script.js"></script>