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处理button dropdown

场景

button dropdown就是把按钮和下拉菜单弄到了一起。处理这种对象的思路一般是先点击这个按钮，等待下拉菜单显示出来，然后使用层级定位方法来获取下拉菜单中的具体项。

代码

下面的代码演示了如何找到watir-webdriver这个菜单项。其处理方法是先点击info按钮，然后等到下拉菜单出现后定位下拉菜单的ul元素，再定位ul元素中link text为watir-webdriver的link，并点击之。

button_dropdown.html

	<html>
		<head>
			<meta http-equiv="content-type" content="text/html;charset=utf-8" />
			<title>button group</title>		
			<script type="text/javascript" async="" src="http://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
			<link href="http://netdna.bootstrapcdn.com/twitter-bootstrap/2.3.2/css/bootstrap-combined.min.css" rel="stylesheet" />		
			<script type="text/javascript">
				$(document).ready(function(){
					$('.btn').click(function(){
						alert($(this).text());
					});
				});			
			</script>
		</head>
		<body>
			<h3>button group</h3>
			<div class="row-fluid">
				<div class="span3">		
					<div class="well">
						<div class="btn-toolbar">
							<div class="btn-group">
								<div class="btn">first</div>
								<div class="btn">second</div>
								<div class="btn">third</div>
							</div>
						</div>
					</div>			
				</div>		
			</div>		
		</body>
		<script src="http://netdna.bootstrapcdn.com/twitter-bootstrap/2.3.2/js/bootstrap.min.js"></script>
	</html>

button_dropdown.java

	import java.io.File;

	import org.openqa.selenium.By;
	import org.openqa.selenium.WebDriver;
	import org.openqa.selenium.chrome.ChromeDriver;
	import org.openqa.selenium.support.ui.ExpectedCondition;
	import org.openqa.selenium.support.ui.WebDriverWait;


	public class ButtonDropdown {

		public static void main(String[] args) throws InterruptedException {
			WebDriver dr = new ChromeDriver();
			
			File file = new File("src/button_dropdown.html");
			String filePath = "file:///" + file.getAbsolutePath();
			System.out.printf("now accesss %s \n", filePath);
			
			dr.get(filePath);
			Thread.sleep(1000);
			
	//		定位text是watir-webdriver的下拉菜单
	//		首先显示下拉菜单
			dr.findElement(By.linkText("Info")).click();
			
			(new WebDriverWait(dr, 10)).until(new ExpectedCondition<Boolean>() {
				public Boolean apply(WebDriver d){
					return d.findElement(By.className("dropdown-menu")).isDisplayed();
				}
			});
			
	//		通过ul再层级定位
			dr.findElement(By.className("dropdown-menu")).findElement(By.linkText("watir-webdriver")).click();
			
			Thread.sleep(1000);
			System.out.println("browser will be close");
			dr.quit();	
		}

	}