Eval erorr: {-32000 Object reference chain is too long }

[kurimi1]

Rod Version: v0.109.3

reference: puppeteer/puppeteer#2746

url: http://123.120.53.141:8181/
js:

webix

inchrome:

The code to demonstrate your question

func Test_Evel(t *testing.T) {
	paramURL := "http://123.120.53.141:8181/"
	l := launcher.MustNewManaged("").Headless(true)
	Browser := rod.
		New().
		Client(l.MustClient()).
		MustConnect().
		MustIgnoreCertErrors(true)
	Page := Browser.MustIncognito().MustPage()
	errRod := rod.Try(func() {
		Page.
			Timeout(30 * time.Second).
			MustNavigate(paramURL)
	})
	if errRod != nil {
		logrus.Errorf("Error while visiting %s : %s", paramURL, errRod.Error())

		return
	}
	errRod = rod.Try(func() {
		Page.
			Timeout(30 * time.Second).
			MustWaitLoad()
	})
	if errRod != nil {
		logrus.Errorf("Error while loading %s : %s", paramURL, errRod.Error())

		return
	}
	jsProp := "webix"
	res, err := Page.Eval("() =>" + jsProp)
	if err == nil && res != nil && res.Value.Val() != nil {
		value := ""
		if res.Type == "string" || res.Type == "number" {
			value = res.Value.String()
		}
		logrus.Info(value)
		return
	} else {
		logrus.Error("js eval error:", err)
		return
	}
}

time="2022-09-01T08:22:46Z" level=error msg="js eval error:{-32000 Object reference chain is too long }"

[rod-robot]

Please fix the format of your markdown:

6:4 MD009/no-trailing-spaces Trailing spaces [Expected: 0 or 2; Actual: 1]
7 MD031/blanks-around-fences Fenced code blocks should be surrounded by blank lines [Context: "```js"]
9 MD031/blanks-around-fences Fenced code blocks should be surrounded by blank lines [Context: "```"]
60 MD031/blanks-around-fences Fenced code blocks should be surrounded by blank lines [Context: "```"]
61 MD031/blanks-around-fences Fenced code blocks should be surrounded by blank lines [Context: "```"]
61 MD040/fenced-code-language Fenced code blocks should have a language specified [Context: "```"]
65 MD012/no-multiple-blanks Multiple consecutive blank lines [Expected: 1; Actual: 2]
66 MD012/no-multiple-blanks Multiple consecutive blank lines [Expected: 1; Actual: 3]

_{generated by check-issue}

[kurimi1]

same site
js:

jQuery.pjax

chrome:

rod err:

\u003cnil\u003e

what is it ?

[ysmood]

It's because the object is too big for chrome to serialize it into a JSON string.

For example, run the code below in the devtools console:

let a = {};
a.b = a;
JSON.stringify(a);

You will get this error:

Uncaught TypeError: Converting circular structure to JSON

But you can still get the huge object's reference with Rod and fetch its properties like this test case:

rod/page_eval_test.go

Lines 285 to 304 in 0acf6e2

	func TestEvalObjectReferenceChainIsTooLong(t *testing.T) {
	g := setup(t)
	p := g.page.MustNavigate(g.blank())
	obj, err := p.Evaluate(&rod.EvalOptions{
	JS: `() => {
	let a = {b: 1}
	a.c = a
	return a
	}`,
	})
	g.E(err)
	_, err = p.Eval(`a => a`, obj)
	g.Eq(err.Error(), "{-32000 Object reference chain is too long }")
	val := p.MustEval(`a => a.c.c.c.c.b`, obj)
	g.Eq(val.Int(), 1)
	}

About \u003cnil\u003e, just use the js to log it, such as console.log("\u003cnil\u003e") It's the standard way to fmt.Print values in golang.