java - 在使用 Selenium Web 驱动程序执行脚本之前如何等待屏幕大小调整？

Question

我目前的这部分代码有问题:

webDriver.manage().window().setSize(new Dimension(width,height));
TimeUnit.MILLISECONDS.sleep(100);
webDriver.executeScript("window.scrollTo(0,document.body.scrollHeight);");

问题是我希望在脚本执行和滚动之前调整屏幕大小，而 sleep 命令可以帮助我实现这一目标。但如果我删除它，滚动有时会在调整屏幕大小之前发生。我尝试用 ExpectedCondition 检查替换 sleep :

private boolean waitForScreenToResize(final int HEIGHT) {
    WebDriverWait wait = new WebDriverWait(webDriver, 1);

    ExpectedCondition<Boolean> screenResized = new ExpectedCondition<Boolean>() {
        @Override
        public Boolean apply(WebDriver webDriver) {
            return webDriver.manage().window().getSize().getHeight() == HEIGHT;
        }
    };

    return wait.until(screenResized);
}

webDriver.manage().window().setSize(new Dimension(width,height));
waitForScreenToResize(height);
webDriver.executeScript("window.scrollTo(0,document.body.scrollHeight);");

我以为这会起作用，但问题仍然存在。大家有什么想法吗？

编辑:忘记提及我想删除 sleep 并将其替换为检查屏幕大小是否已调整的逻辑方法。

Answer 1

如果调整窗口大小时文档大小发生变化，您可以尝试等待 scrollHeight 发生变化:

String JS_GET_SCROLL_HEIGHT = "return Math.max(document.documentElement.scrollHeight, document.body.scrollHeight) | 0;";
String JS_SCROLL_BOTTOM = "window.scroll(0, -1 >>> 1);";

// get the current scroll height
Object scrollHeight = driver.executeScript(JS_GET_SCROLL_HEIGHT);

// set the size of the window
driver.manage().window().setSize(new Dimension(width, height));

// wait for the scroll height to change
new WebDriverWait(driver, 10)
  .until(drv -> !drv.executeScript(JS_GET_SCROLL_HEIGHT).equals(scrollHeight));

// scroll to the bottom
driver.executeScript(JS_SCROLL_BOTTOM);

如果没有，您也可以尝试等待innerHeight改变:

String JS_GET_INNER_HEIGHT = "return window.innerHeight | 0;";
String JS_SCROLL_BOTTOM = "window.scroll(0, -1 >>> 1);";

// get the current scroll height
Object innerHeight = driver.executeScript(JS_GET_INNER_HEIGHT);

// set the size of the window
driver.manage().window().setSize(new Dimension(width, height));

// wait for the scroll height to change
new WebDriverWait(driver, 10)
  .until(drv -> !drv.executeScript(JS_GET_INNER_HEIGHT).equals(innerHeight));

// scroll to the bottom
driver.executeScript(JS_SCROLL_BOTTOM);