how to execute js function on load of a js script using JavaScriptExecutor in Selenium WebDriver

Question

I'm trying to execute a js function after js script gets loaded on an HTML page. But the issue is js script takes some time to load on the HTML page. It works fine if I add a sleep for few seconds in my java code and then execute the js function.

index.html

<!DOCTYPE HTML>
<html lang="en">
<head>
</head>
<body>

</body>
<script>
    var loadJS = function(url) {
        var script = document.createElement("script");  
        script.src = url;  
        document.body.appendChild(script); 
    }   
</script>
</html>

Java Code

JavascriptExecutor js = (JavascriptExecutor) driver;
js.executeScript("www.test-url.com");
js.executeScript("loadData(123)");

The above code works if I add Thread.sleep(5000); between the above js.executeScript code lines but not when I remove it. How do I replace the Thread.sleep(5000); and still make it work

Please read How do I ask a good question? and How to create a Minimal, Reproducible Example — Rojo
– Rojo, Commented Mar 24, 2021 at 15:59

la_petite_kozel · Accepted Answer · 2021-03-24 19:12:27Z

2

Have you tried this out?

JavascriptExecutor js = (JavascriptExecutor) driver;
js.executeScript("console.log('Javascript console');");

You need to cast a WebDriver into a JavascriptExecutor object. ExecuteScript functions will not be available unless you perform this cast. Then you will have access to the .executeScript() function

Sample driver = new Sample (new SampleProfile());
driver.executeScript("console.log('Javascript console');");

edited Mar 24, 2021 at 19:12

answered Mar 24, 2021 at 16:07

la_petite_kozel

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2 Comments

Prashant Kumar Over a year ago

Yes, I have done that and after I load the js using executeScript I want to execute a js function but the function is not found as the script has not been loaded on the HTML page yet

Prashant Kumar Over a year ago

yeah, I am loading the js in the header

Sandeep Koparde · Accepted Answer · 2021-03-24 16:53:31Z

1

Try out using this code before you execute your javascript, This will force the WebDriver to wait till the page is fully loaded:

WebDriverWait wait = new WebDriverWait(driver, 50);
wait.until((ExpectedCondition<Boolean>) wd -> ((JavascriptExecutor) wd).executeScript("return document.readyState").equals("complete"));

answered Mar 24, 2021 at 16:53

Sandeep Koparde

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