JSON Example This example is a JSON string: ‘{“name”:”John”, “age”:30, “car”:null}’ It defines an object with 3 properties: name age car Each property has a value. If you parse the JSON string with a JavaScript program, you can access the…
AJAX can be used for interactive communication with a database. Example – The showCustomer() Function When a user selects a customer in the dropdown list , a function called showCustomer() is executed. The function is triggered by the onchange event:…
AJAX is used to create more interactive applications. Example In the example , when a user types a character in the input field, a function called showHint() is executed. The function is triggered by the onkeyup event. Here is the…
AJAX can be used for interactive communication with an XML file. Example When a user clicks on the “Get CD info” button , the loadDoc() function is executed. The loadDoc() function creates an XMLHttpRequest object, adds the function to be…
Server Response Properties Property Description responseText get the response data as a string responseXML get the response data as XML data The responseText Property The responseText property returns the server response as a JavaScript string, and you can use it…
The XMLHttpRequest object is used to request data from a server. Send a Request To a Server To send a request to a server, we use the open() and send() methods of the XMLHttpRequest object: xhttp.open(“GET”, “ajax_info.txt”, true); xhttp.send(); Method…
The keystone of AJAX is the XMLHttpRequest object. Create an XMLHttpRequest object Define a callback function Open the XMLHttpRequest object Send a Request to a server The XMLHttpRequest Object All modern browsers support the XMLHttpRequest object. The XMLHttpRequest object can…
AJAX is a developer’s dream, because you can: Read data from a web server – after the page has loaded Update a web page without reloading the page Send data to a web server – in the background AJAX Example…
Locate the User’s Position The HTML Geolocation API is used to get the geographical position of a user. Since this can compromise privacy, the position is not available unless the user approves it. Note Geolocation is most accurate for devices…
