Flash cards
Review the key moves
What is the main idea behind AJAX XML Example?
Lesson checks
Practice each idea before moving on
Short Mimo-style checks built from this lesson's code, terms, and sequence.
Which statement best captures the main point of this lesson?
Complete the missing token from the example code.
___ loadDoc() {Put the learning moves in the order that makes the concept easiest to apply.
AJAX can be used for interactive communication with an XML file.
AJAX XML Example
The following example will demonstrate how a web page can fetch information from an XML file with AJAX:
Example Explained
When a user clicks on the "Get CD info" button above, the loadDoc() function is executed.
The loadDoc() function creates an XMLHttpRequest object, adds the function to be executed when the server response is ready, and sends the request off to the server.
When the server response is ready, an HTML table is built, nodes (elements) are extracted from the XML file, and it finally updates the element "demo" with the HTML table filled with XML data:
function loadDoc() {
const xhttp = new XMLHttpRequest();
xhttp.onload = function() {myFunction(this);}
xhttp.open("GET", "cd_catalog.xml");
xhttp.send();
}
function myFunction(xml) {
const xmlDoc = xml.responseXML;
const x = xmlDoc.getElementsByTagName("CD");
let table="<tr><th>Artist</th><th>Title</th></tr>";
for (let i = 0; i <x.length;
i++) {
table += "<tr><td>" + x[i].getElementsByTagName("ARTIST")[0].childNodes[0].nodeValue
+ "</td><td>" + x[i].getElementsByTagName("TITLE")[0].childNodes[0].nodeValue
+ "</td></tr>";
}
document.getElementById("demo").innerHTML = table;
}The XML File
The XML file used in the example above looks like this: " cd_catalog.xml ".