Unanswered

Cannot Automate JavaScript Alert (OK/Cancel Popup) in Browser with Power Automate Desktop

(0) Share

Report

Posted on by CU03071347-2

I’m using Power Automate Desktop to automate a web process (government e-portal). After clicking a button, a JavaScript alert box (popup) appears with OK/Cancel.
The recorder cannot capture this popup.
Mouse clicks don’t work, only Enter key manually works.
I tried 'Send keys' with {Enter} to Foreground window but it doesn't trigger the popup.
How can I auto-close this popup?

Categories:

Power Automate Desktop

I have the same question (0)

All responses (2)

Answers (0)

Suggested answer

TN-20081510-0 52 on at

Like (0)

Report

1)Are you able to inspect this popup?

2)Once you get the id or class name of this popup ,use Run javascript to click on it.

document.getElementsByClassName("classname")[i].click()

Here "i" is the index of classname.

Run JAVASCRIPT ON WEB PAGE USING Microsoft POWER AUTOMATE DESKTOP

Was this reply helpful? Yes No
Suggested answer

Riyaz_riz11 3,844 Super User 2025 Season 2 on at

Like (0)

Report
Hi,

Follow below steps:

Option 1: Send Keys to Browser Process

Instead of sending keys to the “Foreground window,” send keys to the actual browser process.

This works better because PAD then directs the keystroke to any modal dialog owned by the process.

Steps:

Use the “Attach to running window” action:

Attach to your browser window (e.g., Chrome or Edge).

Immediately after clicking the button that triggers the alert, insert:

“Send Keys” action

Target: The attached browser window

Keys: {Enter}

This often works if you give a small delay before sending keys.

If needed, insert a “Delay” action before “Send Keys”:

1–2 seconds (to wait for the popup to appear).

Option 2: Use Shortcut Instead of Click

Sometimes triggering the action via keyboard shortcut or JavaScript injection (instead of mouse click) makes the alert more easily handled.

For example, if pressing a key combination triggers the same event, try Send Keys to trigger it.

Or use “Run JavaScript function on web page” to trigger the action.

Why?

This keeps focus in the automation context rather than a separate OS modal.

Option 3: Fallback—Use External Script to Auto-Close Alerts

If none of the above work (very common on secure portals), you can pre-inject a script that suppresses or auto-accepts all alerts.

How?

Use a “Run JavaScript function on web page” action before the button click:

window.alert = function(msg) { console.log('Auto-accepted alert:', msg); return true; }; window.confirm = function(msg) { console.log('Auto-confirmed:', msg); return true; };

This overrides alert() and confirm() to do nothing.

Caution:

This technique works only if the site doesn’t prevent overrides.

On government portals with CSP restrictions, it might be blocked.

If I have answered your question, please mark it as the preferred solution ✅ . If you like my response, please give it a Thumbs Up 👍.
Regards,
Riyaz

Was this reply helpful? Yes No