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How to use evalHelper method of rod Package

Best Rod code snippet using rod.evalHelper

dev_helpers.go

Source:dev_helpers.go

...83	time.Sleep(b.slowMotion)84}85// ExposeHelpers helper functions to page's js context so that we can use the Devtools' console to debug them.86func (p *Page) ExposeHelpers(list ...*js.Function) {87	p.MustEvaluate(evalHelper(&js.Function{88		Name:         "_" + utils.RandString(8), // use a random name so it won't hit the cache89		Definition:   "() => { window.rod = functions }",90		Dependencies: list,91	}))92}93// Overlay a rectangle on the main frame with specified message94func (p *Page) Overlay(left, top, width, height float64, msg string) (remove func()) {95	id := utils.RandString(8)96	_, _ = p.root.Evaluate(evalHelper(js.Overlay,97		id,98		left,99		top,100		width,101		height,102		msg,103	).ByPromise())104	remove = func() {105		_, _ = p.root.Evaluate(evalHelper(js.RemoveOverlay, id))106	}107	return108}109func (p *Page) tryTrace(typ TraceType, msg ...interface{}) func() {110	if !p.browser.trace {111		return func() {}112	}113	msg = append([]interface{}{typ}, msg...)114	msg = append(msg, p)115	p.browser.logger.Println(msg...)116	return p.Overlay(0, 0, 500, 0, fmt.Sprint(msg))117}118func (p *Page) tryTraceQuery(opts *EvalOptions) func() {119	if !p.browser.trace {120		return func() {}121	}122	p.browser.logger.Println(TraceTypeQuery, opts, p)123	msg := fmt.Sprintf("<code>%s</code>", html.EscapeString(opts.String()))124	return p.Overlay(0, 0, 500, 0, msg)125}126func (p *Page) tryTraceReq(includes, excludes []string) func(map[proto.NetworkRequestID]string) {127	if !p.browser.trace {128		return func(map[proto.NetworkRequestID]string) {}129	}130	msg := map[string][]string{131		"includes": includes,132		"excludes": excludes,133	}134	p.browser.logger.Println(TraceTypeWaitRequestsIdle, msg, p)135	cleanup := p.Overlay(0, 0, 500, 0, utils.MustToJSON(msg))136	ch := make(chan map[string]string)137	update := func(list map[proto.NetworkRequestID]string) {138		clone := map[string]string{}139		for k, v := range list {140			clone[string(k)] = v141		}142		ch <- clone143	}144	go func() {145		var waitlist map[string]string146		t := time.NewTicker(time.Second)147		for {148			select {149			case <-p.ctx.Done():150				t.Stop()151				cleanup()152				return153			case waitlist = <-ch:154			case <-t.C:155				p.browser.logger.Println(TraceTypeWaitRequests, p, waitlist)156			}157		}158	}()159	return update160}161// Overlay msg on the element162func (el *Element) Overlay(msg string) (removeOverlay func()) {163	id := utils.RandString(8)164	_, _ = el.Evaluate(evalHelper(js.ElementOverlay,165		id,166		msg,167	).ByPromise())168	removeOverlay = func() {169		_, _ = el.Evaluate(evalHelper(js.RemoveOverlay, id))170	}171	return172}173func (el *Element) tryTrace(typ TraceType, msg ...interface{}) func() {174	if !el.page.browser.trace {175		return func() {}176	}177	msg = append([]interface{}{typ}, msg...)178	msg = append(msg, el)179	el.page.browser.logger.Println(msg...)180	return el.Overlay(fmt.Sprint(msg))181}182func (m *Mouse) initMouseTracer() {183	_, _ = m.page.Evaluate(evalHelper(js.InitMouseTracer, m.id, assets.MousePointer).ByPromise())184}185func (m *Mouse) updateMouseTracer() bool {186	res, err := m.page.Evaluate(evalHelper(js.UpdateMouseTracer, m.id, m.x, m.y))187	if err != nil {188		return true189	}190	return res.Value.Bool()191}192// Serve a port, if host is empty a random port will be used.193func serve(host string) (string, *http.ServeMux, func() error) {194	if host == "" {195		host = "127.0.0.1:0"196	}197	mux := http.NewServeMux()198	srv := &http.Server{Handler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {199		defer func() {200			if err := recover(); err != nil {...

evalHelper

Using AI Code Generation

1import (2func main() {3    browser := rod.New().Connect()4    page.WaitLoad()5    value, err := page.Eval(`document.querySelector("input[name=q]").value`)6    if err != nil {7        panic(err)8    }9    fmt.Println(value)10}11import (12func main() {13    browser := rod.New().Connect()14    page.WaitLoad()15    value, err := page.Eval(`document.querySelector("input[name=q]").value`)16    if err != nil {17        panic(err)18    }19    fmt.Println(value)20}21import (22func main() {23    browser := rod.New().Connect()24    page.WaitLoad()25    value, err := page.Eval(`document.querySelector("input[name=q]").value`)26    if err != nil {27        panic(err)28    }29    fmt.Println(value)30}31import (32func main() {33    browser := rod.New().Connect()34    page.WaitLoad()35    value, err := page.Eval(`document

evalHelper

Using AI Code Generation

1import (2func main() {3    r := rod.New().Connect()4    page := r.Page("")5    result, _ := page.EvalObject(`document.querySelector("h1").innerText`)6    fmt.Println(result.Value)7}

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