hubcap listeners — List event listeners on an element
When to use
List event listeners attached to an element. Useful for debugging event handling and understanding which events an element responds to.
Usage
hubcap listeners <selector>Arguments
| Argument | Type | Required | Description |
|---|---|---|---|
| selector | string | yes | CSS selector of the element to inspect |
Flags
None.
Output
Returns an object containing an array of event listener objects.
| Field | Type | Description |
|---|---|---|
| listeners | array | Array of event listener objects |
| listeners[].type | string | The event type (e.g., “click”, “input”) |
| listeners[].useCapture | boolean | Whether the listener uses capture phase |
| listeners[].passive | boolean | Whether the listener is passive |
| listeners[].once | boolean | Whether the listener fires only once |
| listeners[].scriptId | string | Script identifier where the listener is defined |
| listeners[].lineNumber | number | Line number in the script |
| listeners[].columnNumber | number | Column number in the script |
{
"listeners": [
{"type":"click","useCapture":false,"passive":false,"once":false,"scriptId":"32","lineNumber":10,"columnNumber":2},
{"type":"input","useCapture":false,"passive":true,"once":false,"scriptId":"32","lineNumber":15,"columnNumber":2}
]
}Errors
| Condition | Exit code | Stderr |
|---|---|---|
| Element not found | 1 | error: element not found: <sel> |
| Chrome not connected | 2 | error: connecting to Chrome: ... |
| Timeout | 3 | error: timeout |
Examples
List all event listeners on a button:
hubcap listeners '#submit'List listeners and filter to just click handlers:
hubcap listeners '#submit' | jq '[.listeners[] | select(.type == "click")]'