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Web Building - Fetching Data with JSON


Building a web site from scratch.   Part VII: Fetching data using JSON.


What We Will Do

In this chapter we will:

  • Fetch data from a text file using JSON

The JSON File

The following file is stored on our web server:

http://www.w3schools.com/website/Customers_JSON.php

[
{
"Name" : "Alfreds Futterkiste",
"City" : "Berlin",
"Country" : "Germany"
},
{
"Name" : "Berglunds snabbköp",
"City" : "Luleå",
"Country" : "Sweden"
},
{
"Name" : "Centro comercial Moctezuma",
"City" : "México D.F.",
"Country" : "Mexico"
},
{
"Name" : "Ernst Handel",
"City" : "Graz",
"Country" : "Austria"
},
{
"Name" : "FISSA Fabrica Inter. Salchichas S.A.",
"City" : "Madrid",
"Country" : "Spain"
},
{
"Name" : "Galería del gastrónomo",
"City" : "Barcelona",
"Country" : "Spain"
},
{
"Name" : "Island Trading",
"City" : "Cowes",
"Country" : "UK"
},
{
"Name" : "Königlich Essen",
"City" : "Brandenburg",
"Country" : "Germany"
},
{
"Name" : "Laughing Bacchus Wine Cellars",
"City" : "Vancouver",
"Country" : "Canada"
},
{
"Name" : "Magazzini Alimentari Riuniti",
"City" : "Bergamo",
"Country" : "Italy"
},
{
"Name" : "North/South",
"City" : "London",
"Country" : "UK"
},
{
"Name" : "Paris spécialités",
"City" : "Paris",
"Country" : "France"
},
{
"Name" : "Rattlesnake Canyon Grocery",
"City" : "Albuquerque",
"Country" : "USA"
},
{
"Name" : "Simons bistro",
"City" : "København",
"Country" : "Denmark"
},
{
"Name" : "The Big Cheese",
"City" : "Portland",
"Country" : "USA"
},
{
"Name" : "Vaffeljernet",
"City" : "Århus",
"Country" : "Denmark"
},
{
"Name" : "Wolski Zajazd",
"City" : "Warszawa",
"Country" : "Poland"
}
]


Change the Customers Page to use JSON

In the DemoWeb folder, change the file Customers.html.

Put the following code inside the file:

Customers.html

<!DOCTYPE html>
<html>

<head>
  <title>Our Company</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_JSON.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 arr = JSON.parse(response);
    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 »


Read More

Read more about JSON in our JSON Tutorial.



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