Inject JQuery trong Selenium WebDriver

(function(jqueryUrl, callback) {
    if (typeof jqueryUrl != 'string') {
        jqueryUrl = 
            'https://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js';
    }
    if (typeof jQuery == 'undefined') {
        var script = document.createElement('script');
        var head = document.getElementsByTagName('head')[0];
        var done = false;
        script.onload = script.onreadystatechange = (function() {
            if (!done && (!this.readyState || this.readyState == 'loaded' 
                    || this.readyState == 'complete')) {
                done = true;
                script.onload = script.onreadystatechange = null;
                head.removeChild(script);
                callback();
            }
        });
        script.src = jqueryUrl;
        head.appendChild(script);
    }
    else {
        callback();
    }
})(arguments[0], arguments[arguments.length - 1]);

package vn.viettuts.selenium;

import java.awt.AWTException;
import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.Reader;
import java.nio.charset.Charset;
import java.util.concurrent.TimeUnit;

import org.openqa.selenium.JavascriptExecutor;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.chrome.ChromeDriver;

public class MyUtils {
    /**
     * open chrome browser
     * 
     * @author phamvanthanh
     * @throws InterruptedException
     * @throws AWTException
     */
    public static WebDriver openChrome() {
        System.setProperty("webdriver.chrome.driver", 
                "D:SeleniumWebdriverchromedriver.exe");
        return new ChromeDriver();
    }
    
    /**
     * read file
     * 
     * @author viettuts.vn
     * @param file
     * @return
     * @throws IOException
     */
    public static String readFile(String file) throws IOException {
        Charset cs = Charset.forName("UTF-8");
        FileInputStream stream = new FileInputStream(file);
        try {
            Reader reader = new BufferedReader(new InputStreamReader(stream, cs));
            StringBuilder builder = new StringBuilder();
            char[] buffer = new char[8192];
            int read;
            while ((read = reader.read(buffer, 0, buffer.length)) > 0) {
                builder.append(buffer, 0, read);
            }
            return builder.toString();
        } finally {
            stream.close();
        }
    }
    
    /**
     * inject jQuery to page
     * 
     * @author viettuts.vn
     * @throws IOException
     */
    public static void injectJQuery(WebDriver driver, String jQueryStr) 
            throws IOException {
        String jQueryLoader = MyUtils.readFile(jQueryStr);
        driver.manage().timeouts().setScriptTimeout(10, TimeUnit.SECONDS);
        JavascriptExecutor js = (JavascriptExecutor) driver;
        js.executeAsyncScript(jQueryLoader);
    }
}

package vn.viettuts.selenium;

import java.io.IOException;

import org.openqa.selenium.JavascriptExecutor;
import org.openqa.selenium.WebDriver;

public class Test {
    // lenh height() trong JQuery
    private static String HEIGHT_JQ = "return $(document ).height();";
    private static String JQUERY_FILE = "D:MyJQuery.txt";
    public static void main(String[] args) throws IOException {
        WebDriver driver = MyUtils.openChrome();
        driver.manage().window().maximize();
        driver.get("http://viettuts.vn");
        // Inject JQuery trong Selenium WebDriver
        MyUtils.injectJQuery(driver, JQUERY_FILE);
        // tinh chieu cao cua trang viettuts.vn
        JavascriptExecutor jse = ((JavascriptExecutor) driver);
        long pageHeight = (Long) jse.executeScript(HEIGHT_JQ);
        System.out.println("$(document ).height() = " + pageHeight);
    }
}