Executing a JavaScript function during the loading of a JavaScript script with JavaScriptExecutor in Selenium WebDriver

I'm facing a challenge in executing a JavaScript function after the script has been loaded on an HTML page. The issue arises because the JavaScript script takes some time to load on the HTML page. It functions properly only if I introduce a delay of a few seconds in my Java code before executing the JavaScript 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 provided code successfully executes when Thread.sleep(5000); is included between the lines with the js.executeScript commands, but fails when this delay is omitted. How can I eliminate the need for Thread.sleep(5000); and still achieve the desired functionality?

Answer №1

Have you experimented with this method?

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

It is essential to cast a WebDriver as a JavascriptExecutor object in order to use the ExecuteScript functions. Without performing this casting, the .executeScript() function will not be accessible.

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

Answer №2

To ensure your JavaScript runs smoothly, try incorporating this code snippet to make the WebDriver wait until the page is completely loaded:

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

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