How to write ajax code in javascript

The second parameter is the URL you're sending the request to. You have two options to access that data: httpRequest. In the following example, we differentiate between a successful and unsuccessful AJAX call by checking for a OK response code. To mitigate this problem, you could wrap your if Whereas, the POST method is used to send large amount of data, such as form data.

This article guides you through the AJAX basics and gives you two simple hands-on examples to get you started.

Ajax get request

Therefore you must check where the response currently stands in its lifecycle before processing it using the readyState property of the XMLHttpRequest object. The GET method is generally used to send small amount of data to the server. This article guides you through the AJAX basics and gives you two simple hands-on examples to get you started. It is only there for historical reasons. For example, use the following before calling send for form data sent as a query string: httpRequest. Our JavaScript will request a dynamic page this time, test. Then in alertContents , we need to replace the line alert httpRequest. What's AJAX? Ajax is just a term to describe the process of exchanging data from a web server asynchronously through JavaScript, without refreshing the page. You can also add an always-different GET parameter, like a timestamp or random number see bypassing the cache Note 3: If the httpRequest variable is used globally, competing functions calling makeRequest can overwrite each other, causing a race condition.

The following illustrations demonstrate how Ajax communication works: Since Ajax requests are usually asynchronous, execution of the script continues as soon as the Ajax request is sent, i. Also, the function assigned to the onreadystatechange event handler called every time the readyState property changes.

ajax javascript example
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JavaScript Ajax