Using Selenium to wait for a JavaScript script to return a value that matches the desired value

Question

Using Selenium to wait for a JavaScript script to return a value that matches the desired value

My current challenge in JavaScript involves waiting for a specific string or boolean value to be matched.

Here is the relevant JavaScript code snippet:

document.getElementById('video_html5').seeking;

When this code is executed, it returns either "false" or "true". I need to wait until the value is "false", indicating that the video is not seeking. However, I have only been able to figure out how to wait for a general JavaScript command value without being able to test for specific text matches.

new WebDriverWait(driver, 30)
    .until(ExpectedConditions.jsReturnsValue("return document.getElementById('video_html5').seeking;"));

There are cases where the returned value is a string rather than a boolean, so I must also account for comparing strings.

I managed to achieve this functionality in Ruby, but I am still looking for a way to do it in Java:

wait_element = @wait.until { @driver.execute_script("return document.getElementById('vid1_html5_api_Shaka_api').seeking;").eql? false }

javascript java selenium-webdriver

Answer 1

Answer №1

If you want to create your own unique expected conditions, you can do so by writing custom code.

public class CustomConditions {

  public static ExpectedCondition<Boolean> myCustomCondition() {
    return new ExpectedCondition<Boolean>() {
      @Override
      public Boolean apply(WebDriver driver) {
        return (Boolean) ((JavascriptExecutor) driver)
          .executeScript("return document.getElementById('video_html5').seeking === 'string_value' || ... ");
      }
    };
  }
}

You can then use this custom condition in your tests like this:

WebDriverWait wait = new WebDriverWait(driver, 30);
wait.until(CustomConditions.myCustomCondition());

Answer 2

If you want to create your own unique expected conditions, you can do so by writing custom code.

public class CustomConditions {

  public static ExpectedCondition<Boolean> myCustomCondition() {
    return new ExpectedCondition<Boolean>() {
      @Override
      public Boolean apply(WebDriver driver) {
        return (Boolean) ((JavascriptExecutor) driver)
          .executeScript("return document.getElementById('video_html5').seeking === 'string_value' || ... ");
      }
    };
  }
}

You can then use this custom condition in your tests like this:

WebDriverWait wait = new WebDriverWait(driver, 30);
wait.until(CustomConditions.myCustomCondition());

Answer 3

Answer №2

Here is a simple method to execute JavaScript code using WebDriver and wait for the output:

public Object executeScriptAndWaitOutput(WebDriver driver, long timeout, final String command) {
  WebDriverWait wait = new WebDriverWait(driver, timeout);
  wait.withMessage("Timeout executing script: " + command);

  final Object[] out = new Object[1];
  wait.until(new ExpectedCondition<Boolean>() {
    @Override
    public Boolean apply(WebDriver d) {
      try {
        out[0] = executeScript(command);
      } catch (WebDriverException we) {
        log.warn("Exception executing script", we);
        out[0] = null;
      }
      return out[0] != null;
    }
  });
  return out[0];
}

Answer 4

Here is a simple method to execute JavaScript code using WebDriver and wait for the output:

public Object executeScriptAndWaitOutput(WebDriver driver, long timeout, final String command) {
  WebDriverWait wait = new WebDriverWait(driver, timeout);
  wait.withMessage("Timeout executing script: " + command);

  final Object[] out = new Object[1];
  wait.until(new ExpectedCondition<Boolean>() {
    @Override
    public Boolean apply(WebDriver d) {
      try {
        out[0] = executeScript(command);
      } catch (WebDriverException we) {
        log.warn("Exception executing script", we);
        out[0] = null;
      }
      return out[0] != null;
    }
  });
  return out[0];
}

Answer 5

Answer №3

After gathering insights from various sources, I was able to solve the issue by implementing the following method:

public Boolean checkStateSeeking() throws InterruptedException {
        JavascriptExecutor js = (JavascriptExecutor) driver;
        Boolean seekingState = (Boolean) js
                .executeScript("return document.getElementById('vid1_html5').seeking;");

        while (seekingState) {
            // System.out.println(seekingState);
            seekingState = (Boolean) js
                    .executeScript("return document.getElementById('vid1_html5').seeking;");
        }

        return seekingState;
    }

Answer 6

After gathering insights from various sources, I was able to solve the issue by implementing the following method:

public Boolean checkStateSeeking() throws InterruptedException {
        JavascriptExecutor js = (JavascriptExecutor) driver;
        Boolean seekingState = (Boolean) js
                .executeScript("return document.getElementById('vid1_html5').seeking;");

        while (seekingState) {
            // System.out.println(seekingState);
            seekingState = (Boolean) js
                    .executeScript("return document.getElementById('vid1_html5').seeking;");
        }

        return seekingState;
    }

Answer 7

Answer №4

Creating a function to monitor element changes and wait for a specified amount of time before moving on, based on the element's xpath and expected value.

 public static String waitForElementChange(WebDriver driver, String expectedValue, String path, int waitTime) throws InterruptedException {
    JavascriptExecutor js = (JavascriptExecutor) driver;
    String elementValue = (String) js
            .executeScript("return document.evaluate(\""+path+"\", document, null, XPathResult.FIRST_ORDERED_NODE_TYPE, null).singleNodeValue.value;");

    while (!(elementValue.equals(expectedValue)) && (waitTime > 0)) {
        Thread.sleep(1000);
        waitTime--;
        elementValue = (String) js
                .executeScript("return document.evaluate(\""+path+"\", document, null, XPathResult.FIRST_ORDERED_NODE_TYPE, null).singleNodeValue.value;");
    }
    return elementValue;
}

Answer 8

Creating a function to monitor element changes and wait for a specified amount of time before moving on, based on the element's xpath and expected value.

 public static String waitForElementChange(WebDriver driver, String expectedValue, String path, int waitTime) throws InterruptedException {
    JavascriptExecutor js = (JavascriptExecutor) driver;
    String elementValue = (String) js
            .executeScript("return document.evaluate(\""+path+"\", document, null, XPathResult.FIRST_ORDERED_NODE_TYPE, null).singleNodeValue.value;");

    while (!(elementValue.equals(expectedValue)) && (waitTime > 0)) {
        Thread.sleep(1000);
        waitTime--;
        elementValue = (String) js
                .executeScript("return document.evaluate(\""+path+"\", document, null, XPathResult.FIRST_ORDERED_NODE_TYPE, null).singleNodeValue.value;");
    }
    return elementValue;
}

Using Selenium to wait for a JavaScript script to return a value that matches the desired value

Answer №1

Answer №2

Answer №3

Answer №4

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