777CC / chromedp-cheatsheet

chromedp cheatsheet

Chromedp Cheatsheet

Installing

Install in the usual Go way:

$ go get -u github.com/chromedp/chromedp

Helloworld

Command click is a chromedp example demonstrating how to use a selector to click on an element.

package main

import (
	"context"
	"log"
	"time"

	"github.com/chromedp/chromedp"
)

func main() {
	// create chrome instance
	ctx, cancel := chromedp.NewContext(
		context.Background(),
		// chromedp.WithDebugf(log.Printf),
	)
	defer cancel()

	// create a timeout
	ctx, cancel = context.WithTimeout(ctx, 15*time.Second)
	defer cancel()

	// navigate to a page, wait for an element, click
	var example string
	err := chromedp.Run(ctx,
		chromedp.Navigate(`https://pkg.go.dev/time`),
		// wait for footer element is visible (ie, page is loaded)
		chromedp.WaitVisible(`body > footer`),
		// find and click "Example" link
		chromedp.Click(`#example-After`, chromedp.NodeVisible),
		// retrieve the text of the textarea
		chromedp.Value(`#example-After textarea`, &example),
	)
	if err != nil {
		log.Fatal(err)
	}
	log.Printf("Go's time.After example:\n%s", example)
}

Open new tab

clone, cancel := chromedp.NewContext(ctx)
        defer cancel()
        fmt.Printf("%s is opening in a new tab\n", url)

        if err := chromedp.Run(clone, chromedp.Navigate(url)); err != nil {
            // do something nice with you errors!
            panic(err)
        }

Disable headless mode

options := append(chromedp.DefaultExecAllocatorOptions[:],
  chromedp.Flag(`headless`, false),
  chromedp.Flag(`enable-automation`, false),
)

allocCtx, cancel := chromedp.NewExecAllocator(context.Background(), options...)
defer cancel()

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

Sleep

if err := chromedp.Run(ctx, chromedp.Tasks{
        chromedp.Navigate(pageURL),
		chromedp.Sleep(5 * time.Second)
    }); err != nil {
        panic(err)
    }

Check if element exists

Download image

Select dropdown