Web SQL Example

by harsh dand

HTML

<h1>WebSQL Example</h1>

<div id="controls">
    <p>Add a car to the database</p>
    <label>Make: </label><input type="text" id="carmake" /><br />
    <label>Model: </label><input type="text" id="carmodel" /><br />
    <button type="button" id="addcar" onclick="addCar();">Add Car</button>
</div>
<div id="carlistholder">
    <h3>Your Cars</h3>
    <ul id="carlist">
    </ul>
</div>
<p><strong>Note: </strong>You can leave this page and when you return the cars you entered will still be here!</p>

CSS

body {
    font-family: sans-serif; 
    padding: 10px;    
}
h1 {
    font-weight: bold;   
}
label {
     font-size: small;   
}
#controls {
    padding-bottom: 5px;
    border-bottom: 1px solid #000;    
}

JavaScript

//Test for browser compatibility
if (window.openDatabase) {
    //Create the database the parameters are 1. the database name 2.version number 3. a description 4. the size of the database (in bytes) 1024 x 1024 = 1MB
    var mydb = openDatabase("cars_db", "0.1", "A Database of Cars I Like", 1024 * 1024);

    //create the cars table using SQL for the database using a transaction
    mydb.transaction(function(t) {
        t.executeSql("CREATE TABLE IF NOT EXISTS cars (id INTEGER PRIMARY KEY ASC, make TEXT, model TEXT)");
    });



} else {
    alert("WebSQL is not supported by your browser!");
}

//function to output the list of cars in the database

function updateCarList(transaction, results) {
    //initialise the listitems variable
    var listitems = "";
    //get the car list holder ul
    var listholder = document.getElementById("carlist");

    //clear cars list ul
    listholder.innerHTML = "";

    var i;
    //Iterate through the results
    for (i = 0; i < results.rows.length; i++) {
        //Get the current row
        var row = results.rows.item(i);

        listholder.innerHTML += "<li>" + row.make + " - " + row.model + " (<a href='javascript:void(0);' onclick='deleteCar(" + row.id + ");'>Delete Car</a>)";
    }

}

//function to get the list of cars from the database

function outputCars() {
    //check to ensure the mydb object has been created
    if (mydb) {
        //Get all the cars from the database with a select statement, set outputCarList as the callback function for the executeSql command
        mydb.transaction(function(t) {
            t.executeSql("SELECT * FROM cars", [], updateCarList);
        });
    } else {
        alert("db not found, your browser does not support web sql!");
    }
}

//function to add the car to the database

function addCar() {
    //check to ensure the mydb object has been created
    if (mydb) {
        //get the values of the make and model text inputs
        var make =...