I'm curious if it's possible to modify a webpage loaded by HtmlUnit prior to the execution of any javascript code

To begin, I want to elaborate on the reasoning behind my question.

My current task involves testing a complex web page using Selenium + HtmlUnit, which triggers various JavaScript scripts. This issue is likely a common one.

One specific problem I encountered is with a button on the page that has a jQuery click callback attached after the page loads. In order to handle this in the test code, there is an explicit wait for the button to become clickable. However, sometimes Selenium clicks the button before the click event handler is attached by jQuery, resulting in the test failing.

An idea I had was to preprocess the web page accessed by HtmlUnit before any JavaScript runs, by injecting

<script>myownscript()</script>
at the beginning of the page. By doing so, I could determine when the click event handler has been attached (the specifics depend on the application) and ensure that the button is clicked only after this point, avoiding errors caused by missing event handlers.

Without delving into the merits of this approach, another option would be to simply introduce a delay in the Selenium test code before attempting to click the problematic button. However, this may extend the overall test duration, especially given that similar issues exist on multiple pages within the application being tested.

Are there any tools or methods available in Selenium/HtmlUnit that allow for preprocessing of fetched pages from the server, enabling the injection of scripts as described, before JavaScript execution begins?

Answer №1

If you find yourself in this particular situation, JavaScriptExecutor can come to the rescue. By adding a custom function within the String script, you have the flexibility to execute any desired actions.

WebElement button = driver.findElement(By.id("my-button"));
JavascriptExecutor jsExe = ((JavascriptExecutor) driver);
String script = "console.log(arguments[0].id); return arguments[0].id";
Object result = jsExe.executeScript(script, button);
String textResult = result.toString();
System.out.println(textResult);

It's worth noting that caution should be exercised when utilizing asynchronous functions like setTimeout(), as they may return prematurely. For a demonstration of an async method, refer to my response here: method execute_script don't wait end of script to return value with selenium in python

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