Document: beforescriptexecute event

{{APIRef("DOM")}}{{non-standard_header}}

The beforescriptexecute event fires when a static {{HTMLElement("script")}} is about to start executing. It does not fire if the element is added dynamically, such as with {{domxref("Node.appendChild()", "appendChild()")}}.

Syntax

Use the event name in {{domxref("EventTarget/addEventListener", "addEventListener()")}}:

addEventListener("beforescriptexecute", (event) => { })

Alternatively, assign to the event handler property of the interface:

onbeforescriptexecute = (event) => { }

Event type

A generic {{domxref("Event")}}.

Examples

function starting(e) {
  logMessage(`Starting script with ID: ${e.target.id}`);
}

document.addEventListener("beforescriptexecute", starting);
// Or (but note that this replaces other event listeners
// added using onbeforescriptexecute, if any)
document.onbeforescriptexecute = starting;

View Live Example

Specifications

Not part of any specification.

Browser compatibility

{{Compat}}

See also

• {{domxref("Document.afterscriptexecute_event", "afterscriptexecute")}} event of Document
• {{domxref("Document.currentScript")}}