Web Building - Data as a Service (DaaS)
Building a web site from scratch. Part VIII: Data as a service.
What We Will Do
In this chapter we will:
- Fetch dynamic data from a web server running SQL
Using a PHP Server Running MySQL
In the demoweb folder, change the file customers.html.
Put the following code inside the file:
customers.html
<!DOCTYPE html>
<html>
<head>
<title>Customers</title>
<link href="site.css" rel="stylesheet">
</head>
<body>
<nav
id="nav01"></nav>
<div id="main">
<h1>Customers</h1>
<div
id="id01"></div>
<footer id="foot01"></footer>
</div>
<script src="script.js"></script>
<script>
var xmlhttp
= new XMLHttpRequest();
var url = "http://www.w3schools.com/website/customers_db_mysql.php";
xmlhttp.onreadystatechange = function() {
if
(xmlhttp.readyState == 4 && xmlhttp.status == 200) {
myFunction(xmlhttp.responseText);
}
}
xmlhttp.open("GET", url, true);
xmlhttp.send();
function myFunction(response) {
var obj = JSON.parse(response);
var arr = obj.records;
var i;
var out
= "<table><tr><th>Name</th><th>City</th><th>Country</th></tr>";
for(i = 0; i < arr.length; i++) {
out += "<tr><td>" +
arr[i].Name
+
"</td><td>" +
arr[i].City +
"</td><td>" +
arr[i].Country +
"</td></tr>";
}
out += "</table>"
document.getElementById("id01").innerHTML = out;
}
</script>
</body>
</html>
Try it Yourself »
The code above is the same as in the JSON chapter.
Only this time the XMLHttpRequest reads data from "customers_db_mysql.php".
customers_db_mysql.php fetches data from a "live" database, while customers.php fetches a "static" text file.
Using an ASP.NET Server Running SQL Server
In the demoweb folder, change the file customers.html.
Put the following code inside the file:
customers.html
<!DOCTYPE html>
<html>
<head>
<title>Customers</title>
<link href="site.css" rel="stylesheet">
</head>
<body>
<nav
id="nav01"></nav>
<div id="main">
<h1>Customers</h1>
<div
id="id01"></div>
<footer id="foot01"></footer>
</div>
<script src="script.js"></script>
<script>
var xmlhttp
= new XMLHttpRequest();
var url = "http://www.w3schools.com/website/customers_db_sql.aspx";
xmlhttp.onreadystatechange = function() {
if
(xmlhttp.readyState == 4 && xmlhttp.status == 200) {
myFunction(xmlhttp.responseText);
}
}
xmlhttp.open("GET", url, true);
xmlhttp.send();
function myFunction(response) {
var obj = JSON.parse(response);
var arr = obj.records;
var i;
var out
= "<table><tr><th>Name</th><th>City</th><th>Country</th></tr>";
for(i = 0; i < arr.length; i++) {
out += "<tr><td>" +
arr[i].Name
+
"</td><td>" +
arr[i].City +
"</td><td>" +
arr[i].Country +
"</td></tr>";
}
out += "</table>"
document.getElementById("id01").innerHTML = out;
}
</script>
</body>
</html>
Try it Yourself »
The code above is the same as the previous one.
Only this time the XMLHttpRequest reads data from "customers_db_sql.aspx".
Read More
Read more about SQL in our SQL Tutorial.
