Selenium C# IJavaScriptExecutor throws error but JS is fine

Question

I'm using Selenium C# to test a pretty complex web UI in Internet Explorer 11. As you might know, Selenium's Click() tends to not work in which case inserting a JS click method is necessary. I'm running the dynamically generated script below using

(IJavaScriptExecutor) driver).ExecuteScript(script). Here is the script :

let iFrame = document.getElementById("dkwframe").contentWindow.document;
let element = iFrame.querySelector("[id*='_ImgLnkNewPage_LinkButtonControl']");
element.click();

The script works fine when I execute it directly in the IE console, but when executing with it Selenium I get this :

System.InvalidOperationException : Error executing JavaScript (UnexpectedJavaScriptError)

The IE console is empty so I don't think it's even trying. Also, switching browser isn't an option.

Thanks for the help

Note that by calling .click() you are no longer simulating a user click and no longer writing an end to end test. The click from Javascript simply executes the underlying listener or attached redirection which doesn't validate that a real user will be able to click the targeted element. Regarding you error, let is not supported by IE11 and should be replaced by var. — Florent B.
– Florent B., Commented May 4, 2018 at 11:37
Hello and thanks for the response. I know calling the .click() is not ideal but it's the only solution I've got. As for what I'm clicking I make sure it's a clickable element. I will try to replace let by var asap! — Lucky-Luke87
– Lucky-Luke87, Commented May 4, 2018 at 12:02

undetected Selenium · Accepted Answer · 2018-05-04 09:48:17Z

1

Maybe the script is being executed before the page is fully loaded ,try to put it in a page ready event ha dler like that

window.onload = function() {
    et iFrame = document.getElementById("dkwframe").contentWindow.document;
    let element = iFrame.querySelector("[id*='_ImgLnkNewPage_LinkButtonControl']");
    element.click();
}

Or you can check if the fully loaded with :

if (document.readyState === 'complete') {
}

edited May 4, 2018 at 9:48

undetected Selenium

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answered May 4, 2018 at 9:24

JacopoDT

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2 Comments

JacopoDT Over a year ago

Let me know if this helped

Lucky-Luke87 Over a year ago

Hello and thanks. Unfortunately, having the window fully loaded and putting the script in a function didn't solve it :/

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