AJAX

Note (2025): This article dates back to 2009. The examples remain useful, though modern apps often prefer fetch()/XHR or form submissions driven by frameworks. The classic form‑build approach below still works universally. HTML 4.0 (W3C) defines how browsers submit forms: GET: append query string to the action URL (application/x-www-form-urlencoded). POST: send a request body to the action URL, using the content type indicated by enctype. Programmatic POST helper Add this in your page head: ...