Waiting for JavaScript/Vue/Angular to finish loading using Selenium in Java

I am currently developing an automation tool for a website using Selenium in Java. To enhance the real automation process, I heavily rely on JavaScript with JavascriptExecutor. While things usually run smoothly, there are occasional crashes (around 1 out of 10 times). It seems like the code is executing too quickly during those instances. Despite utilizing implicit and explicit waits from the WebDriverWait class, I believe these waits only apply to the DOM or elements within it, rather than waiting for all scripts to finish executing. This led me to search for a function or snippet that can address this issue. It's worth mentioning that the website utilizes both Vue and Angular frameworks.

Appreciate any help in advance!

javascriptjavaseleniumdomwebdriver

Answer №1

If you encounter issues with your script failing when navigating to a different HTML page by clicking on a link or button, it could be due to the possibility of the application crashing. To prevent this, consider adding page load time to your implicit wait function.

Answer №2

If you want to ensure that Angular has finished processing any pending requests, you can implement an explicit wait:

public static ExpectedCondition angularProcessingComplete() {
    return new ExpectedCondition() {
        @Override
        public Boolean apply(WebDriver driver) {
            JavascriptExecutor jsExec = ((JavascriptExecutor) driver)
            String result = jsExec.executeScript("return (window.angular != null) && (angular.element(document).injector() != null) && (angular.element(document).injector().get('$http').pendingRequests.length === 0)")
            return Boolean.valueOf(result);
        }
    };
}

To use this method, simply call it within a WebDriverWait instance:

WebDriverWait wait = new WebDriverWait(driver, 15, 100);
wait.until(angularProcessingComplete());

I've found that using explicit waits like this greatly reduces the inconsistencies in Angular automation.

It's advisable to stick with explicit waits and avoid implicit waits altogether, as implicit waits can prolong the time required for negative checks. Also, refrain from mixing implicit and explicit waits, as this could lead to unpredictable behavior.

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