GopeedLab/gopeed · error

missing or invalid "selector"

Error message

missing or invalid "selector"

What it means

Argument-presence error from requireStringArg raised by the focus binding (extension_runtime_webview.go:154-158): page.focus(selector) was called with a nil/undefined/null selector. The bridge validates presence before page.Focus runs, and any missing selector aborts the extension script with this exception.

Source

Thrown at pkg/download/extension_runtime_webview.go:157

			panic(vm.ToValue(err))
		}
		return goja.Undefined()
	})
	_ = obj.Set("execute", func(call goja.FunctionCall) goja.Value {
		expression, err := enginewebview.NormalizeExecutableValue(call.Argument(0))
		if err != nil {
			panic(vm.ToValue(err))
		}
		result, err := page.Execute(expression, exportArgs(call.Arguments[1:])...)
		if err != nil {
			panic(vm.ToValue(err))
		}
		return vm.ToValue(result)
	})
	_ = obj.Set("focus", func(call goja.FunctionCall) goja.Value {
		selector, err := requireStringArg(call, 0, "selector")
		if err != nil {
			panic(vm.ToValue(err))
		}
		if err := page.Focus(selector); err != nil {
			panic(vm.ToValue(err))
		}
		return goja.Undefined()
	})
	_ = obj.Set("click", func(call goja.FunctionCall) goja.Value {
		selector, err := requireStringArg(call, 0, "selector")
		if err != nil {
			panic(vm.ToValue(err))
		}
		if err := page.Click(selector, optionalMap(call.Argument(1))); err != nil {
			panic(vm.ToValue(err))
		}
		return goja.Undefined()
	})
	_ = obj.Set("type", func(call goja.FunctionCall) goja.Value {
		selector, err := requireStringArg(call, 0, "selector")

View on GitHub (pinned to 7b7327ffb3)

Solutions

1. Pass a concrete CSS selector: page.focus("#username")
2. Guard dynamic selectors with a fallback or your own error before calling focus
3. Verify the selector table has an entry for the current site

Example fix

// before
const sel = selectors[host]; // undefined for unknown host
page.focus(sel);

// after
const sel = selectors[host];
if (!sel) throw new Error(`no focus selector for host ${host}`);
page.focus(sel);

if (!sel) throw new Error("focus selector is required");
page.focus(sel);

function isSelector(v) {
  return typeof v === "string" && v.trim().length > 0;
}

When it happens

Trigger: Calling page.focus() with no arguments; passing a selector variable that is undefined because a selector-lookup table had no entry; forwarding an optional parameter that the caller omitted.

Common situations: Site-specific selectors stored per-domain where one domain lacks an entry; refactors renaming the selector variable at the call site only; selector arrays iterated with a sparse index yielding undefined.

Related errors

• missing or invalid "%s"
• missing or invalid "url"
• execute expects a string or function
• missing or invalid "text"
• invalid resource file name

AI-assisted analysis of GopeedLab/gopeed@7b7327ffb3 (2026-08-16). Data as JSON: /api/errors/76cb70397fa917eb. Report an issue: GitHub.