How to use Eval method of rod Package

Best Rod code snippet using rod.Eval

page_eval_test.go

Source:page_eval_test.go

...7	"github.com/go-rod/rod/lib/proto"8	"github.com/go-rod/rod/lib/utils"9	"github.com/ysmood/gson"10)11func TestPageEvalOnNewDocument(t *testing.T) {12	g := setup(t)13	p := g.newPage()14	p.MustEvalOnNewDocument(`window.rod = 'ok'`)15	// to activate the script16	p.MustNavigate(g.blank())17	g.Eq(p.MustEval("() => rod").String(), "ok")18	g.Panic(func() {19		g.mc.stubErr(1, proto.PageAddScriptToEvaluateOnNewDocument{})20		p.MustEvalOnNewDocument(`1`)21	})22}23func TestPageEval(t *testing.T) {24	g := setup(t)25	page := g.page.MustNavigate(g.blank())26	g.Eq(3, page.MustEval(`27		(a, b) => a + b28	`, 1, 2).Int())29	g.Eq(10, page.MustEval(`(a, b, c, d) => a + b + c + d`, 1, 2, 3, 4).Int())30	g.Eq(page.MustEval(`function() {31		return 1132	}`).Int(), 11)33	g.Eq(page.MustEval(`	 ; () => 1; `).Int(), 1)34	// reuse obj35	obj := page.MustEvaluate(rod.Eval(`() => () => 'ok'`).ByObject())36	g.Eq("ok", page.MustEval(`f => f()`, obj).Str())37	_, err := page.Eval(`10`)38	g.Has(err.Error(), `eval js error: TypeError: 10.apply is not a function`)39	_, err = page.Eval(`() => notExist()`)40	g.Is(err, &rod.ErrEval{})41	g.Has(err.Error(), `eval js error: ReferenceError: notExist is not defined`)42}43func TestPageEvaluateRetry(t *testing.T) {44	g := setup(t)45	page := g.page.MustNavigate(g.blank())46	g.mc.stub(1, proto.RuntimeCallFunctionOn{}, func(send StubSend) (gson.JSON, error) {47		g.mc.stub(1, proto.RuntimeCallFunctionOn{}, func(send StubSend) (gson.JSON, error) {48			return gson.New(nil), cdp.ErrCtxNotFound49		})50		return gson.New(nil), cdp.ErrCtxNotFound51	})52	g.Eq(1, page.MustEval(`() => 1`).Int())53}54func TestPageUpdateJSCtxIDErr(t *testing.T) {55	g := setup(t)56	page := g.page.MustNavigate(g.srcFile("./fixtures/click-iframe.html"))57	g.mc.stub(1, proto.RuntimeCallFunctionOn{}, func(send StubSend) (gson.JSON, error) {58		g.mc.stubErr(1, proto.RuntimeEvaluate{})59		return gson.New(nil), cdp.ErrCtxNotFound60	})61	g.Err(page.Eval(`() => 1`))62	frame := page.MustElement("iframe").MustFrame()63	frame.MustReload()64	g.mc.stubErr(1, proto.DOMDescribeNode{})65	g.Err(frame.Element(`button`))66	frame.MustReload()67	g.mc.stubErr(1, proto.DOMResolveNode{})68	g.Err(frame.Element(`button`))69}70func TestPageExpose(t *testing.T) {71	g := setup(t)72	page := g.newPage(g.blank()).MustWaitLoad()73	stop := page.MustExpose("exposedFunc", func(g gson.JSON) (interface{}, error) {74		return g.Get("k").Str(), nil75	})76	utils.All(func() {77		res := page.MustEval(`() => exposedFunc({k: 'a'})`)78		g.Eq("a", res.Str())79	}, func() {80		res := page.MustEval(`() => exposedFunc({k: 'b'})`)81		g.Eq("b", res.Str())82	})()83	// survive the reload84	page.MustReload().MustWaitLoad()85	res := page.MustEval(`() => exposedFunc({k: 'ok'})`)86	g.Eq("ok", res.Str())87	stop()88	g.Panic(func() {89		stop()90	})91	g.Panic(func() {92		page.MustReload().MustWaitLoad().MustEval(`() => exposedFunc()`)93	})94	g.Panic(func() {95		g.mc.stubErr(1, proto.RuntimeCallFunctionOn{})96		page.MustExpose("exposedFunc", nil)97	})98	g.Panic(func() {99		g.mc.stubErr(1, proto.RuntimeAddBinding{})100		page.MustExpose("exposedFunc2", nil)101	})102	g.Panic(func() {103		g.mc.stubErr(1, proto.PageAddScriptToEvaluateOnNewDocument{})104		page.MustExpose("exposedFunc", nil)105	})106}107func TestObjectRelease(t *testing.T) {108	g := setup(t)109	res, err := g.page.Evaluate(rod.Eval(`() => document`).ByObject())110	g.E(err)111	g.page.MustRelease(res)112}113func TestPromiseLeak(t *testing.T) {114	g := setup(t)115	/*116		Perform a slow action then navigate the page to another url,117		we can see the slow operation will still be executed.118	*/119	p := g.page.MustNavigate(g.blank())120	utils.All(func() {121		_, err := p.Eval(`() => new Promise(r => setTimeout(() => r(location.href), 1000))`)122		g.Is(err, cdp.ErrCtxDestroyed)123	}, func() {124		utils.Sleep(0.3)125		p.MustNavigate(g.blank())126	})()127}128func TestObjectLeak(t *testing.T) {129	g := setup(t)130	/*131		Seems like it won't leak132	*/133	p := g.page.MustNavigate(g.blank())134	obj := p.MustEvaluate(rod.Eval("() => ({a:1})").ByObject())135	p.MustReload().MustWaitLoad()136	g.Panic(func() {137		p.MustEvaluate(rod.Eval(`obj => obj`, obj))138	})139}140func TestPageObjectErr(t *testing.T) {141	g := setup(t)142	g.Panic(func() {143		g.page.MustObjectToJSON(&proto.RuntimeRemoteObject{144			ObjectID: "not-exists",145		})146	})147	g.Panic(func() {148		g.page.MustElementFromNode(&proto.DOMNode{NodeID: -1})149	})150	g.Panic(func() {151		node := g.page.MustNavigate(g.blank()).MustElement(`body`).MustDescribe()152		g.mc.stubErr(1, proto.DOMResolveNode{})153		g.page.MustElementFromNode(node)154	})155}156func TestGetJSHelperRetry(t *testing.T) {157	g := setup(t)158	g.page.MustNavigate(g.srcFile("fixtures/click.html"))159	g.mc.stub(1, proto.RuntimeCallFunctionOn{}, func(send StubSend) (gson.JSON, error) {160		return gson.JSON{}, cdp.ErrCtxNotFound161	})162	g.page.MustElements("button")163}164func TestConcurrentEval(t *testing.T) {165	g := setup(t)166	p := g.page.MustNavigate(g.blank())167	list := make(chan int, 2)168	start := time.Now()169	utils.All(func() {170		list <- p.MustEval(`() => new Promise(r => setTimeout(r, 2000, 2))`).Int()171	}, func() {172		list <- p.MustEval(`() => new Promise(r => setTimeout(r, 1000, 1))`).Int()173	})()174	duration := time.Since(start)175	g.Gt(duration, 1000*time.Millisecond)176	g.Lt(duration, 3000*time.Millisecond)177	g.Eq([]int{<-list, <-list}, []int{1, 2})178}179func TestPageSlowRender(t *testing.T) {180	g := setup(t)181	p := g.page.MustNavigate(g.srcFile("./fixtures/slow-render.html"))182	g.Eq(p.MustElement("div").MustText(), "ok")183}184func TestPageIframeReload(t *testing.T) {185	g := setup(t)186	p := g.page.MustNavigate(g.srcFile("./fixtures/click-iframe.html"))187	frame := p.MustElement("iframe").MustFrame()188	btn := frame.MustElement("button")189	g.Eq(btn.MustText(), "click me")190	frame.MustReload()191	btn = frame.MustElement("button")192	g.Eq(btn.MustText(), "click me")193	g.Has(*p.MustElement("iframe").MustAttribute("src"), "click.html")194}195func TestPageObjCrossNavigation(t *testing.T) {196	g := setup(t)197	p := g.page.MustNavigate(g.blank())198	obj := p.MustEvaluate(rod.Eval(`() => ({})`).ByObject())199	g.page.MustNavigate(g.blank())200	_, err := p.Evaluate(rod.Eval(`() => 1`).This(obj))201	g.Is(err, &rod.ErrObjectNotFound{})202	g.Has(err.Error(), "cannot find object: {\"type\":\"object\"")203}204func TestEnsureJSHelperErr(t *testing.T) {205	g := setup(t)206	p := g.page.MustNavigate(g.blank())207	g.mc.stubErr(2, proto.RuntimeCallFunctionOn{})208	g.Err(p.Elements(`button`))209}210func TestEvalOptionsString(t *testing.T) {211	g := setup(t)212	p := g.page.MustNavigate(g.srcFile("fixtures/click.html"))213	el := p.MustElement("button")214	g.Eq(rod.Eval(`() => this.parentElement`).This(el.Object).String(), "() => this.parentElement() button")215}216func TestEvalObjectReferenceChainIsTooLong(t *testing.T) {217	g := setup(t)218	p := g.page.MustNavigate(g.blank())219	obj, err := p.Evaluate(&rod.EvalOptions{220		JS: `() => {221			let a = {b: 1}222			a.c = a223			return a224		}`,225	})226	g.E(err)227	_, err = p.Eval(`a => a`, obj)228	g.Eq(err.Error(), "{-32000 Object reference chain is too long }")229	val := p.MustEval(`a => a.c.c.c.c.b`, obj)230	g.Eq(val.Int(), 1)231}...

Eval

Using AI Code Generation

1import (2func main() {3	browser := rod.New().MustConnect()4	defer browser.MustClose()5	page.MustEval(`() => {6		document.querySelector('input[name="q"]').value = "rod"7	}`)8	page.MustElement("input[name=q]").MustInput("rod")9	page.MustElement("input[name=q]").MustPress(proto.InputKeyEvent{10	})11	fmt.Println(page.MustInfo().URL)12}

Eval

Using AI Code Generation

1import (2func main() {3	fmt.Print("Enter a number: ")4	fmt.Scanf("%f", &input)5	output := math.Sqrt(input)6	fmt.Println(output)7}

Eval

Using AI Code Generation

1import (2func main() {3	l := launcher.New().Headless(false)4	defer l.Cleanup()5	browser := rod.New().ControlURL(l).MustConnect()6	res, err := page.Eval(`() => {7		return {8		}9	}`)10	if err != nil {11		panic(err)12	}13	fmt.Println(res.Get("foo").Int())14	fmt.Println(res.Get("bar").String())15}16import (17func main() {18	l := launcher.New().Headless(false)19	defer l.Cleanup()20	browser := rod.New().ControlURL(l).MustConnect()

Eval

Using AI Code Generation

1import (2func main() {3    page.MustEval("document.title", &title)4    fmt.Println(title)5}6import (7func main() {8    page.MustElement("input[name='q']").MustInput("rod")9}10import (11func main() {12    page.MustElements("input[name='q']").MustInput("rod")13}14import (15func main() {16    page.MustElementR("input[name='q']").MustInput("rod")17}18import (19func main() {20    page.MustElementsR("input[name='q']").MustInput("rod")21}22import (23func main() {

Eval

Using AI Code Generation

1import (2type rod struct {3}4func (r rod) Eval() {5	fmt.Println("Eval method of rod class")6}7func main() {8	r := rod{length: 5}9	x := reflect.ValueOf(r)10	fmt.Println("Type of x is:", x.Type())11	fmt.Println("Kind of x is:", x.Kind())12	fmt.Println("Value of x is:", x)13	fmt.Println("Is x a struct?", x.Kind() == reflect.Struct)14	fmt.Println("Is x a pointer?", x.Kind() == reflect.Ptr)15	fmt.Println("Is x a method?", x.Kind() == reflect.Func)16	fmt.Println("Is x a int?", x.Kind() == reflect.Int)17	fmt.Println("Is x a string?", x.Kind() == reflect.String)18}19Value of x is: {5}

Eval

Using AI Code Generation

1import (2func main() {3    router := mux.NewRouter()4    router.HandleFunc("/api/rod", GetRod).Methods("GET")5    log.Fatal(http.ListenAndServe(":8080", router))6}7func GetRod(w http.ResponseWriter, r *http.Request) {8    rod := Rod{1, 2, 3}9    fmt.Println(rod)10    fmt.Println(rod.Eval())11}12{1 2 3}13import (14func main() {15    router := mux.NewRouter()16    router.HandleFunc("/api/rod", GetRod).Methods("GET")17    log.Fatal(http.ListenAndServe(":8080", router))18}19func GetRod(w http.ResponseWriter, r *http.Request) {20    rod := Rod{1, 2, 3}21    fmt.Println(rod)22    fmt.Println(rod.Eval())23}24{1 2 3}25import (26func main() {27    router := mux.NewRouter()28    router.HandleFunc("/api/rod", GetRod).Methods("GET")29    log.Fatal(http.ListenAndServe(":8080", router))30}31func GetRod(w http.ResponseWriter, r *http.Request) {32    rod := Rod{1, 2, 3}33    fmt.Println(rod)34    fmt.Println(rod.Eval())35}36{1 2 3}37import (38func main() {39    router := mux.NewRouter()40    router.HandleFunc("/api/rod", GetRod).Methods("GET")41    log.Fatal(http.ListenAndServe(":8080", router))42}43func GetRod(w http.ResponseWriter, r *http.Request) {44    rod := Rod{1, 2, 3}

Eval

Using AI Code Generation

1import (2func main() {3	fmt.Println("Hello, playground")4	fmt.Println(math.E)5}6import (7func main() {8	fmt.Println("Hello, playground")9	fmt.Println(math.E)10}11import (12func main() {13	fmt.Println("Hello, playground")14	fmt.Println(math.E)15}16import (17func main() {18	fmt.Println("Hello, playground")19	fmt.Println(math.E)20}21import (22func main() {23	fmt.Println("Hello, playground")24	fmt.Println(math.E)25}26import (27func main() {28	fmt.Println("Hello, playground")29	fmt.Println(math.E)30}31import (32func main() {33	fmt.Println("Hello, playground")34	fmt.Println(math.E)35}36import (37func main() {38	fmt.Println("Hello, playground")39	fmt.Println(math.E)40}41import (42func main() {43	fmt.Println("Hello, playground")44	fmt.Println(math.E)45}

Eval

Using AI Code Generation

1import (2func main() {3	fmt.Println("a = ", a, "b = ", b, "c = ", c)4}5import (6func main() {7	fmt.Println("a = ", a, "b = ", b, "c = ", c)8}9import (10func main() {11	fmt.Println("a = ", a, "b = ", b, "c = ", c)12}

Eval

Using AI Code Generation

1import (2func main() {3	r := new(rod)4	area := r.Eval(2)5	fmt.Println(area)6}7type rod struct {8}9func (r *rod) Eval(radius float64) float

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