chromedp/examples/eval/main.go

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package main
import (
"context"
"log"
cdp "github.com/knq/chromedp"
)
func main() {
var err error
// create context
ctxt, cancel := context.WithCancel(context.Background())
defer cancel()
// create chrome instance
c, err := cdp.New(ctxt)
if err != nil {
log.Fatal(err)
}
// run task list
var res []string
err = c.Run(ctxt, cdp.Tasks{
cdp.Navigate(`https://www.brank.as`),
cdp.WaitVisible(`#footer`, cdp.ByID),
cdp.Evaluate(`Object.keys(window);`, &res),
})
if err != nil {
log.Fatal(err)
}
// shutdown chrome
err = c.Shutdown(ctxt)
if err != nil {
log.Fatal(err)
}
// wait for chrome to finish
err = c.Wait()
if err != nil {
log.Fatal(err)
}
log.Printf("window object keys: %v", res)
}