WebDriver中使用JQuery选择器

1. 在已加载了JQuery的页面上可以直接使用JQuery选择器

例如www.jquery.com网站，如果我们想定位红框中导航栏中的偶数为就可以使用jquery的伪选择器:even

具体实现如下

package com.example.tests;
import static org.junit.Assert.*;
import java.util.*;
import org.junit.*;
import org.openqa.selenium.*;
import org.openqa.selenium.ie.InternetExplorerDriver;

public class test {
    WebDriver driver =  new InternetExplorerDriver();
    JavascriptExecutor jse = (JavascriptExecutor)driver;
    @Test
    public void jQueryTest() {
        driver.get( "http://www.jquery.com/" );
            //在executeScript中调用jQuery.find(jquerySelector);
             List<WebElement> elements =
                     (List<WebElement>)jse.executeScript( "return jQuery.find" + "('.menu-item a:even')" );
             assertEquals( 3 ,elements.size());
             assertEquals( "Download" ,elements.get( 0 ).getText());
             assertEquals( "Blog" ,elements.get( 1 ).getText());
             assertEquals( "Browser Support" ,elements.get( 2 ).getText());
            driver.close();
    }
}

2. 另一种情况就是页面没有另载jQuery，我们需要先 判断再自已手动注入，以百度为例，百度首页是没有加载的

package com.example.tests;

import static org.junit.Assert.*;
import java.util.*;
import org.junit.*;
import org.openqa.selenium.*;
import org.openqa.selenium.ie.InternetExplorerDriver;

public class Selenium2{
    WebDriver driver =  new InternetExplorerDriver();
    JavascriptExecutor jse = (JavascriptExecutor) driver;

    @Test
    public void jQueryTest() {
        driver.get( "http://www.baidu.com/" );
        injectjQueryIfNeeded();
        List<WebElement> elements = (List<WebElement>) jse
                .executeScript( "return jQuery.find('#nv a')" );
        assertEquals( 7 , elements.size());  // 验证超链接的数量
        for ( int i =  0 ; i < elements.size(); i++) {
            System.out.print(elements.get(i).getText() +  "、" );
        }
        driver.close();
    }
    private void injectjQueryIfNeeded() {
        if (!jQueryLoaded())
            injectjQuery();
    }

    // 判断是已加载jQuery
    public Boolean jQueryLoaded() {
        Boolean loaded;
        try {
            loaded = (Boolean) jse.executeScript( "return " +  "jQuery()!=null" );
        }  catch (WebDriverException e) {
            loaded =  false ;
        }
        return loaded;
    }

    // 通过注入jQuery
    public void injectjQuery() {
        jse.executeScript( " var headID = "
                +  "document.getElementsByTagName(\"head\")[0];"
                +  "var newScript = document.createElement('script');"
                +  "newScript.type = 'text/javascript';" +  "newScript.src = "
                +  "'http://ajax.googleapis.com/ajax/"
                +  "libs/jquery/1.7.2/jquery.min.js';"
                +  "headID.appendChild(newScript);" );
    }
}