How to navigate page from string html golang in chromedp

var x = `<h1>Hello World</h1>`

How to navigate chromedp to x without saving x as file?

There are two options:

1. Serve the content from an HTTP server

package main

import (
	"context"
	"log"
	"net/http"
	"net/http/httptest"
	"time"

	"github.com/chromedp/chromedp"
)

func main() {
	s := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.Write([]byte("<h1>Hello World</h1>"))
	}))
	defer s.Close()

	opts := append(chromedp.DefaultExecAllocatorOptions[:],
		chromedp.Flag("headless", false),
	)

	ctx, cancel := chromedp.NewExecAllocator(context.Background(), opts...)
	defer cancel()

	ctx, cancel = chromedp.NewContext(ctx)
	defer cancel()

	if err := chromedp.Run(ctx,
		chromedp.Navigate(s.URL),
		chromedp.Sleep(10*time.Second),
	); err != nil {
		log.Print(err)
	}
}

2. Use page.SetDocumentContent to modify the page directly

package main

import (
	"context"
	"log"
	"time"

	"github.com/chromedp/cdproto/page"
	"github.com/chromedp/chromedp"
)

func main() {
	opts := append(chromedp.DefaultExecAllocatorOptions[:],
		chromedp.Flag("headless", false),
	)

	ctx, cancel := chromedp.NewExecAllocator(context.Background(), opts...)
	defer cancel()

	ctx, cancel = chromedp.NewContext(ctx)
	defer cancel()

	html := `<h1>Hello World</h1>`
	if err := chromedp.Run(ctx,
		chromedp.Navigate("about:blank"),
		chromedp.ActionFunc(func(ctx context.Context) error {
			frameTree, err := page.GetFrameTree().Do(ctx)
			if err != nil {
				return err
			}
			return page.SetDocumentContent(frameTree.Frame.ID, html).Do(ctx)
		}),
		chromedp.Sleep(10*time.Second),
	); err != nil {
		log.Fatal(err)
	}
}

See https://github.com/chromedp/chromedp/issues/941#issuecomment-961181348

This works fine for me.. thanks a lot for the keyword @Zeke Lu

package main
import (
"context"
"log"
"github.com/chromedp/cdproto/page"
"github.com/chromedp/chromedp"
)
func main() {
opts := append(chromedp.DefaultExecAllocatorOptions[:],
chromedp.Flag("headless", false),
)
ctx, cancel := chromedp.NewExecAllocator(context.Background(), opts...)
defer cancel()
ctx, cancel = chromedp.NewContext(ctx)
defer cancel()
htmlContent := `<h1>Hello World</h1>`
if err := chromedp.Run(ctx,
chromedp.Navigate("about:blank"),
loadHTMLFromStringActionFunc(htmlContent),
); err != nil {
log.Fatal(err)
}
}
func loadHTMLFromStringActionFunc(content string) chromedp.ActionFunc {
return chromedp.ActionFunc(func(ctx context.Context) error {
ch := make(chan bool, 1)
defer close(ch)
go chromedp.ListenTarget(ctx, func(ev interface{}) {
if _, ok := ev.(*page.EventLoadEventFired); ok {
ch <- true
}
})
frameTree, err := page.GetFrameTree().Do(ctx)
if err != nil {
return err
}
if err := page.SetDocumentContent(frameTree.Frame.ID, content).Do(ctx); err != nil {
return err
}
select {
case <-ch:
return nil
case <-ctx.Done():
return context.DeadlineExceeded
}
})
}