How to detect javascript alert using chromedp

user_10369441 0
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I'm trying to identify that an alert popped up after navigating to a URL using chromedp. I tried using a listener as follows but I'm new to Golang so I'm not sure why it didn't work.

package main

import (
        "context"
        "log"
        "fmt"
        "github.com/chromedp/chromedp"
        "github.com/chromedp/cdproto/page"
)

func main() {
        // create context
        url := "https://grey-acoustics.surge.sh/?__proto__[onload]=alert('hello')"
        ctx, cancel := chromedp.NewContext(context.Background())
        defer cancel()

        chromedp.ListenTarget(ctx, func(ev interface{}) {
                if ev, ok := ev.(*page.EventJavascriptDialogOpening); ok {
                        fmt.Println("Got an alert: %s", ev.Message)
                }
        })

        // run task list
        err := chromedp.Run(ctx,
                chromedp.Navigate(url),
        )
        if err != nil {
                log.Fatal(err)
        }

}
chromedp google-chrome-headless go
1 Answers

For your specific URL it helped to wait for the iframe to load to receive the event, otherwise chromedp seems to stop because it is finished with its task list.

    // run task list
    err := chromedp.Run(ctx,
        chromedp.Navigate(url),
        chromedp.WaitVisible("iframe"),
    )
}
user_50648020
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