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Run JavaScript function on web page not working

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Posted on by GFenzo

Hello, I´m trying to change a date on a website, the problem is that the date can only be changed by selecting it in a calendar that pops up. I think I could do it with PAD actions but would be really hard.

Another way that I found is to change the value with Javascript, so I tried to do it in the console, this is the code:

document.getElementsByName('fecha')[0].value = '27/03/2024'

That works, but when I try to use the Run JavaScript function on web page the flow runs but does nothing.

I´m using Chrome and when the action runs the browser says that it started debugging.

I have also tried just extracting data from the webside with the action (following all the tutorials that you can find) and I´ve gotten the same result, it runs fine but it will not extract the data and also the return variable will always be [Object object]

Thanks for the help in advance!

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Power Automate Desktop

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eetuRobo 4,204 Super User 2025 Season 2 on at

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I tried to replicate and got it to work in a testing site(https://demo.automationtesting.in/Datepicker.html) like this:
Took the element I wanted to populate in chrome by 'Inspect'

Copy JS path in that field you want to populate:
Then paste it into Run JavaScript and then like you have add .value = '27.03.2024' at the end

Hope this helps

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GFenzo 4 on at

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Thanks for your suggestion, I've tried it but it doesn't work, again if I try to use the copied JS Path adding the .value on the Chrome console it works like a charm.
But if I use the same code in the Run JavaScript action it will not work, again, chrome says that power automate started debugging so I think it's doing something, but it doesn't change the date.

Thanks!

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eetuRobo 4,204 Super User 2025 Season 2 on at

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What if you use .focus() on the element in the javaScript? Does it focus on it?
Does the Result variable return something. For me it returns just [object Object] so might not be helpful at all

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Deenuji_Loganathan_ 6,250 Super User 2025 Season 2 on at

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@GFenzo
I recommend checking if basic alerts are functioning in your browser. It's also important to verify if there are any restrictions imposed by any security or browser settings that could potentially hinder your access.

Are you attempting to execute this script from your local machine Power automate desktop to remote/VM machine?

Thanks,
Deenuji Loganathan 👩‍💻
Automation Evangelist 🤖
Follow me on LinkedIn 👥

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GFenzo 4 on at

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I did try to add the .focus and it works (it highlights the box with the date)...
Also I tried with Alert as @Deenuji suggested and it also works, it's just weird that it does not change the date maybe there's some kind of security that does not let me change it.

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ejmvar 4 on at

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Cannot verify JS in Browser at all.
Nothing seems to work.
- no alert("anything");
- no focus on fields
- no return (return"W";)
Does it need anything to get able to run JS?
I'm using Chrome.
JS on the console works fine.
TIA

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ejmvar 4 on at

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Found JS does not always execute if browser exists and I attach to it.
Even if JS shows an alert, it fails to assign a value to an element in DOM.
As an example:
document.querySelectorAll(".datepicker-textbox")[0].value=Start_Date
This fails from PAD, but works once tested in Chrome console.

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