Run JavaScript code with Selenium WebDriver prior to calling get() in Java

Question

Run JavaScript code with Selenium WebDriver prior to calling get() in Java

Currently, I am attempting to use Selenium in Java to access a web page. Unfortunately, the site is returning an error message:

Exception in thread "main" org.openqa.selenium.WebDriverException: com.gargoylesoftware.htmlunit.ScriptException: ReferenceError: "require" is not defined.

After consulting with a front end developer, I was advised to load a specific JavaScript script before the page loads. The script in question is called require.js, and I was able to locate it at https://cdnjs.cloudflare.com/ajax/libs/require.js/2.3.6/require.js

I am currently using htmlunit-driver 2.28. I have noticed that when initializing the driver as follows:

HtmlUnitDriver driver =new HtmlUnitDriver(true);

An option becomes available:

driver.executeScript(script, args)

This option is missing when using

WebDriver driver =new HtmlUnitDriver(true);

Although I can potentially work around this issue by using HtmlUnitDriver (as my code is already in production for other projects using WebDriver), I am unsure how to utilize the executeScript function to pass a URL for the script.

If anyone could provide guidance on injecting this into my WebDriver, I would greatly appreciate it. Thank you!

javascript java selenium

Answer 1

Answer №1

To customize the WebClient utilized by the HtmlUnitDriver, some adjustments need to be made. By default, the option throwExceptionOnScriptError is set to true. However, all browsers tend to stop processing JavaScript if an (unhandled) exception occurs. If I understand correctly, your page also throws this exception when loaded in a real browser; therefore, you need to:

Turn off throwExceptionOnScriptError
Communicate with the page/JavaScript developer regarding code quality

Here's a sample code snippet:

WebDriver driver = new HtmlUnitDriver(true) {
    @Override
    protected WebClient modifyWebClient(WebClient client) {
        client.getOptions().setThrowExceptionOnScriptError(false);
        return client;
    }
};

Answer 2

To customize the WebClient utilized by the HtmlUnitDriver, some adjustments need to be made. By default, the option throwExceptionOnScriptError is set to true. However, all browsers tend to stop processing JavaScript if an (unhandled) exception occurs. If I understand correctly, your page also throws this exception when loaded in a real browser; therefore, you need to:

Turn off throwExceptionOnScriptError
Communicate with the page/JavaScript developer regarding code quality

Here's a sample code snippet:

WebDriver driver = new HtmlUnitDriver(true) {
    @Override
    protected WebClient modifyWebClient(WebClient client) {
        client.getOptions().setThrowExceptionOnScriptError(false);
        return client;
    }
};

Run JavaScript code with Selenium WebDriver prior to calling get() in Java

Answer №1

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