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();
}
}