grafana/k6 · error

parsing element index %q for selector %q: %w

Error message

parsing element index %q for selector %q: %w

What it means

While flattening the $$ result, queryAll iterates GetProperties of the array-like handle and expects numeric keys ('0','1',...); strconv.Atoi rejected a key (element_handle.go:1308). Per JavaScript array semantics the keys must be indices, so a non-numeric key means the protocol returned a non-array-like shape — an internal/k6 bug, not user input.

Source

Thrown at internal/js/modules/k6/browser/common/element_handle.go:1308

	props, err := handles.GetProperties()
	if err != nil {
		// GetProperties has a rich error already, so we don't need to wrap it.
		return nil, err //nolint:wrapcheck
	}

	type indexedElem struct {
		index int
		elem  *ElementHandle
	}

	indexedElems := make([]indexedElem, 0, len(props))
	for key, prop := range props {
		if el := prop.AsElement(); el != nil {
			// DOM elements are stored with numeric indices ("0", "1", "2", ...)
			// per JavaScript's array-like object specification.
			idx, err := strconv.Atoi(key)
			if err != nil {
				return nil, fmt.Errorf("parsing element index %q for selector %q: %w", key, selector, err)
			}
			indexedElems = append(indexedElems, indexedElem{index: idx, elem: el})
		} else if err := prop.Dispose(); err != nil {
			return nil, fmt.Errorf("disposing property while querying all selectors %q: %w", selector, err)
		}
	}

	slices.SortFunc(indexedElems, func(a, b indexedElem) int {
		return cmp.Compare(a.index, b.index)
	})

	els := make([]*ElementHandle, 0, len(indexedElems))
	for _, ie := range indexedElems {
		els = append(els, ie.elem)
	}

	return els, nil
}

View on GitHub (pinned to 93accf6570)

Solutions

1. Upgrade k6 to the latest release
2. If it persists, file a k6 issue with the minimal selector and chromium version
3. Work around with page.$$ or frame.$$ on the containing frame
4. Avoid the affected element.$$ path while the bug is outstanding

try { return await el.$$(sel); }
catch (e) { if (/parsing element index/.test(e.message)) { return await page.$$(sel); /* fallback path */ } throw e; }

When it happens

Trigger: GetProperties returning symbol/named properties or an unexpected object shape from a chromium version deviation; k6 browser-module regression in the $$ plumbing.

Common situations: Not seen in normal use; surfaces with unusual chromium builds or module regressions, consistently for the same selector.

Related errors

• querying selector %q, wrong type %T
• getting element handle for selector %q: %w
• unpacking selected options: %w
• getting text content of element: unexpected type %T (expecti
• unexpected DOM error type %T

AI-assisted analysis of grafana/k6@93accf6570 (2026-08-15). Data as JSON: /api/errors/2ae777cb908fe416. Report an issue: GitHub.