WebDriver中页面滚动(scrolling)

2014 from---http://blog.csdn.net/tanzhangwen/article/details/18733557

这里面主要由链接（http://selenium-tutorial.blogspot.sg/2013/02/scroll-page-webdriver.html）整理过来，主要回答了如何用webdriver来滚动页面，滚上滚下，滚到指定元素以及怎么识别滚动条等。

1. 利用selenium中的focus(locator)函数实现(Link)

@Test
public void testFocus() throws Exception {
selenium.open("/");
selenium.windowMaximize();
selenium.type("q", "selenium wiki");
selenium.click("btnG");
//Waiting for an element
for (int second = 0;; second++) {
if (second >= 60) fail("timeout");
try {
if (selenium.isElementPresent("link=Selenium Overview - Wiki - Liferay.com"))
break;
} catch (Exception e) {}
Thread.sleep(1000);
}
//Set focus on element --then page will scroll down --focus will be on that element
selenium.focus("link=Selenium Overview - Wiki - Liferay.com");
//To capture a screenshot
selenium.captureScreenshot("c:/naga/screenshot.png");
Thread.sleep(10000);
}

2. 利用webdriver执行脚本直接滚动到指定坐标位置(Link Link2)

((JavascriptExecutor) driver).executeScript("scroll(0,250);"); //-250
((JavascriptExecutor) driver).executeScript("scroll(250,0);");
((JavascriptExecutor) driver).executeScript("window.scrollBy(0,250)", "");
((JavascriptExecutor) driver).executeScript("arguments[0].scrollIntoView();" ,webElement);

3. 判断是否有滚动条可以比较窗口高度和滚动条高度(Link)

Selenium.type(xpath of the text-area element,text value);
String str1=Selenium.getEval("this.browserbot.getCurrentWindow().document.getElementsByClassName('cssclassname')[0].clientHeight");
String str = Selenium.getEval("this.browserbot.getCurrentWindow().document.getElementsByClassName('cssclassname')[0].scrollHeight");
int clientHeight = Integer.parseInt(str1);
int scrollHeight = Integer.parseInt(str);
if(clientHeight < scrollHeight){
System.out.println("Vertical scrollbar appears");
}else{
System.out.println("Vertical scrollbar is not appear");
}