XML AJAXLesson 22Free preview

AJAX XMLHttp

This lesson is part of XML · All levels

Summary

XMLHttpRequest is a core AJAX object created with new XMLHttpRequest() in modern browsers. Once the object is created, the next step is to call open() to specify the method and URL, then send() to send the request. The responses are then read via callback onreadystatechange based on readyState values and status.

Key points

Objects created with new XMLHttpRequest()
Open() specifies the method, URL, and asynchronous mode
Send() sends a request to the server
Callback onreadystatechange informs of a change in status
The combination of readyState 4 and status 200 means success.

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