(转)Selenium-11: Execute JavaScript with JavascriptExecutor

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我是靠谱客的博主爱撒娇凉面，最近开发中收集的这篇文章主要介绍(转)Selenium-11: Execute JavaScript with JavascriptExecutor，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

Outline

Sometimes we cannot handle some conditions or problems with Webdriver, web controls don’t react well against selenium commands. In this kind of situations, we use Javascript. It is useful for custom synchronizations, hide or show the web elements, change values, test flash/HTML5 and so on. In order to do these, we can use Selenium’s JavascriptExecutor interface which executes JavaScript through Selenium driver. It has “executeScript” & “executeAsyncScript” methods, to run JavaScript on current browser.

Please, also check my “Selenium Webdriver wait for JavaScript JQuery and Angular” article to learn how to wait Asynchronous calls in your test automation codes.

Before sync and async JavaScript theory and examples, I want to show how to see and run javascript commands on a browser’s console tab. For example, when you go http://www.anaesthetist.com/mnm/javascript/calc.htmwebsite you will see a calculator which is written with Javascript.

First of all, we have to enable Script and Console panels.

javascript

In Script tab you can see the written Javascript code.

javascript

In Console tab you can call JavaScript functions and see their results.

javascript

Let’s do an example. In our example page as you see below calculation is done by “Calculate()” function. If we click “9” and then click “+” and then click “3” and at last step call “Calculate()” function on Console tab, we will get the “12” as a result.

javascript_6

javascript_7

Now, let’s do this example with Selenium JavascriptExecutor.

Test Scenario

Go to http://www.anaesthetist.com/mnm/javascript/calc.htm
Click “9”
Click “+”
Click “3”
Declare JavascriptExecutor and Call Calculate() method.
Assert that result is 12

Test Code:

package Javascript;

import org.junit.AfterClass;

import org.junit.BeforeClass;

import org.junit.Test;

import org.openqa.selenium.By;

import org.openqa.selenium.JavascriptExecutor;

import org.openqa.selenium.WebDriver;

import org.openqa.selenium.WebElement;

import org.openqa.selenium.firefox.FirefoxDriver;

import static org.hamcrest.MatcherAssert.assertThat;

import static org.hamcrest.Matchers.is;

public class CalculatorExampleTest {

static WebDriver driver;

private static String url = "http://www.anaesthetist.com/mnm/javascript/calc.htm";

//Setup Driver

@BeforeClass

public static void setupTest() {

driver = new FirefoxDriver();

driver.navigate().to(url);

driver.manage().window().maximize();

}

@Test

public void calculatorJavaScriptTest() {

//1-) Click "9"

driver.findElement(By.name("nine")).click();

//2-) Click "+"

driver.findElement(By.name("add")).click();

//3-) Click "3"

driver.findElement(By.name("three")).click();

//4-) Declare JavaScriptExecutor and call "Calculate()" function

JavascriptExecutor js =(JavascriptExecutor)driver;

js.executeScript("Calculate();");

//5-) Assert that result is 12

WebElement result = driver.findElement(By.name("Display"));

assertThat(result.getAttribute("value"), is("12"));

}

//Close Driver

@AfterClass

public static void quitDriver() {

driver.quit();

}

Execute JavaScript with executeScript() Method

JavascriptExecutor interface comprises of executeScript() method that executes JavaScript in the context of the currently selected frame or window.
Within the script, use document to refer to the current document. Local variables will not be available once the script has finished executing, though global variables will persist.

[1]
If the script has a return value (i.e. if the script contains a return statement), then the following steps will be taken: [1]
•    For an HTML element, this method returns a WebElement
•    For a decimal, a Double is returned
•    For a non-decimal number, a Long is returned
•    For a boolean, a Boolean is returned
•    For all other cases, a String is returned.
•    For an array, return a List<Object> with each object following the rules above. We support nested lists.
•    Unless the value is null or there is no return value, in which null is returned.

Arguments must be a number, a boolean, a String, WebElement, or a list of any combination of the above. An exception will be thrown if the arguments do not meet these criteria. [1]

javascript_8

I want to give extra examples that shows you what can you do with JavascriptExecutor.

Alert Pop window

JavascriptExecutor js =(JavascriptExecutor)driver;

js.executeScript("alert('SW Test Academy!');");

driver.switchTo().alert().accept();

Get Page Title

JavascriptExecutor js =(JavascriptExecutor)driver;

String title = js.executeScript("return document.title;").toString();

assertThat(driver.getTitle(), is(title));

Refresh Browser Window

1 2	JavascriptExecutor js =(JavascriptExecutor)driver; js.executeScript("history.go(0);");

Scroll-Down Until an Element Displayed

WebElement element = driver.findElement(By.xpath("//*[text()[contains(.,'JavaScript for DoExponent')]]"));

JavascriptExecutor js =(JavascriptExecutor)driver;

js.executeScript("arguments[0].scrollIntoView(true);",element);

Highlight an Element

WebElement sevenButton = driver.findElement(By.name("seven"));

JavascriptExecutor js = (JavascriptExecutor) driver;

js.executeScript("arguments[0].style.border='3px dotted blue'", sevenButton);

javascript_9

Hide and Show an Element

JavascriptExecutor js = (JavascriptExecutor) driver;

//Hide an element

js.executeScript("document.getElementsByName('five')[0].style.display='none'");

//Show an element

js.executeScript("document.getElementsByName('five')[0].style.display='block'");

javascript_10

Create an Anonymous Function and add it to the Global Window

JavascriptExecutor js =(JavascriptExecutor)driver;

//Change title with JavascriptExecutor

js.executeScript("document.title='Title is changed manually!';");

assertThat(driver.getTitle(), Is.is("Title is changed manually!"));

//Create an anonymous function that will stored and added into the global window

js.executeScript("window.changetitle = function(){document.title='Title is changed by function!';};"+

"window.changetitle.call();");

assertThat(driver.getTitle(), Is.is("Title is changed by function!"));

//Change title manually

js.executeScript("document.title='Title is changed manually!';");

assertThat(driver.getTitle(), Is.is("Title is changed manually!"));

//Change title with Function

js. executeScript ("window.changetitle.call();");

assertThat(driver.getTitle(), Is.is("Title is changed by function!"));

Navigate to Other Page

1 2	JavascriptExecutor js =(JavascriptExecutor)driver; js.executeScript("window.location = 'http://www.swtestacademy.com/'");

» Source Code of All Examples for executeScript() Method «

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package Javascript;

import org.hamcrest.core.Is;

import org.junit.AfterClass;

import org.junit.BeforeClass;

import org.junit.FixMethodOrder;

import org.junit.Test;

import org.junit.runners.MethodSorters;

import org.openqa.selenium.By;

import org.openqa.selenium.JavascriptExecutor;

import org.openqa.selenium.WebDriver;

import org.openqa.selenium.WebElement;

import org.openqa.selenium.firefox.FirefoxDriver;

import static org.hamcrest.CoreMatchers.is;

import static org.junit.Assert.assertEquals;

import static org.junit.Assert.assertThat;

@FixMethodOrder(MethodSorters.NAME_ASCENDING)

public class ExecuteScriptTest {

static WebDriver driver;

private static String url = "http://www.anaesthetist.com/mnm/javascript/calc.htm";

//Setup Driver

@BeforeClass

public static void setupTest() {

driver = new FirefoxDriver();

driver.navigate().to(url);

driver.manage().window().maximize();

}

@Test

public void T01_returnTest(){

JavascriptExecutor js =(JavascriptExecutor)driver;

assertEquals("Addition Javascript Test!", 20L,

js.executeScript("return (arguments[0]+arguments[1]);", 10, 10));

}

@Test

public void T02_alertPopUpWindow(){

JavascriptExecutor js =(JavascriptExecutor)driver;

js.executeScript("alert('SW Test Academy!');");

driver.switchTo().alert().accept();

}

@Test

public void T03_getTitle(){

JavascriptExecutor js =(JavascriptExecutor)driver;

String title = js.executeScript("return document.title;").toString();

assertThat(driver.getTitle(), is(title));

}

@Test

public void T04_refreshBrowser(){

JavascriptExecutor js =(JavascriptExecutor)driver;

js.executeScript("history.go(0);");

}

@Test

public void T05_ccrollDownUntilAnElementDisplayed(){

WebElement element = driver.findElement(By.xpath("//*[text()[contains(.,'JavaScript for DoExponent')]]"));

JavascriptExecutor js =(JavascriptExecutor)driver;

js.executeScript("arguments[0].scrollIntoView(true);",element);

}

@Test

public void T06_getURL(){

JavascriptExecutor js =(JavascriptExecutor)driver;

String currentUrl= (String) js.executeScript("return document.URL;");

assertThat(currentUrl, is(driver.getCurrentUrl()));

}

@Test

public void T07_highLightAnElement(){

WebElement sevenButton = driver.findElement(By.name("seven"));

JavascriptExecutor js = (JavascriptExecutor) driver;

js.executeScript("arguments[0].style.border='3px dotted blue'", sevenButton);

}

@Test

public void T08_hideAndShowElement(){

JavascriptExecutor js = (JavascriptExecutor) driver;

//Hide an element

js.executeScript("document.getElementsByName('five')[0].style.display='none'");

//Show an element

js.executeScript("document.getElementsByName('five')[0].style.display='block'");

}

@Test

public void T09_createAnAnonymousFunction(){

JavascriptExecutor js =(JavascriptExecutor)driver;

//Change title with JavascriptExecutor

js.executeScript("document.title='Title is changed manually!';");

assertThat(driver.getTitle(), Is.is("Title is changed manually!"));

//Create an anonymous function that will stored and added into the global window

js.executeScript("window.changetitle = function(){document.title='Title is changed by function!';};"+

"window.changetitle.call();");

assertThat(driver.getTitle(), Is.is("Title is changed by function!"));

//Change title manually

js.executeScript("document.title='Title is changed manually!';");

assertThat(driver.getTitle(), Is.is("Title is changed manually!"));

//Change title with Function

js.executeScript("window.changetitle.call();");

assertThat(driver.getTitle(), Is.is("Title is changed by function!"));

}

@Test

public void T10_navigateToOtherPage(){

JavascriptExecutor js =(JavascriptExecutor)driver;

js.executeScript("window.location = 'http://www.swtestacademy.com/'");

}

//Close Driver

@AfterClass

public static void quitDriver() {

driver.quit();

}

Execute JavaScript with executeAsyncScript() Method

JavascriptExecutor interface comprises of executeAsyncScript() method that is called an additional final argument “arguments[arguments.lenght-1];” which is a callback function to signal that async execution has finished. We have to call from JavaScript, to tell Webdriver, that our Asynchronous execution has finished. If we do not do that, then executeAsyncScpript will timeout and throw a timeout exception.

The first argument passed to the callback function will be used as the script’s result. This value will be handled as follows: [1]

For an HTML element, this method returns a WebElement
For a number, a Long is returned
For a boolean, a Boolean is returned
For all other cases, a String is returned.
For an array, return a List<Object> with each object following the rules above. We support nested lists.
Unless the value is null or there is no return value, in which null is returned

Before we execute AsyncScript, we have to make sure to set the script timeout. Its default is 0. If we do not set a script timeout, our executeAsyncScript will immediately timeout and it won’t work.

Make sure you set the script timeout before you call it.

I want to show you two examples for AsyncScript. One of them is sleep browser for 4 seconds (4000 milliseconds). The second one is about injecting XMLHttpRequest and wait for the result.

First Example: Performing a sleep in the browser under test.

Test Scenario:

First I will get the start time before waiting 4 seconds by using executeAsyncScript() method.
Then, I will use executeAsyncScript() to wait 4 seconds.
Then, I will get the current time
I will subtract (current time – start time) = passed time
Assert that passed time is greater than 4 seconds.

Test Code:

package Javascript;

import org.junit.AfterClass;

import org.junit.BeforeClass;

import org.junit.Test;

import org.openqa.selenium.JavascriptExecutor;

import org.openqa.selenium.WebDriver;

import org.openqa.selenium.firefox.FirefoxDriver;

import java.util.concurrent.TimeUnit;

import static org.junit.Assert.assertTrue;

public class ExecuteAsycSleepBrowserTest {

static WebDriver driver;

private static String url = "http://phppot.com/demo/jquery-dependent-dropdown-list-countries-and-states/";

//Setup Driver

@BeforeClass

public static void setupTest() {

driver = new FirefoxDriver();

driver.navigate().to(url);

driver.manage().window().maximize();

}

@Test

public void browserSleepExampleTest() {

//Set ScriptTimeout

driver.manage().timeouts().setScriptTimeout(10, TimeUnit.SECONDS);

//Declare and set start time

long startTime = System.currentTimeMillis();

//Declare JavascriptExecutor

JavascriptExecutor js =(JavascriptExecutor)driver;

//Call executeAsyncScript() method

js.executeAsyncScript("window.setTimeout(arguments[arguments.length - 1], 4000);");

//Get the difference (currentTime - startTime) it should be greater than 1500

System.out.println("Passed time: " + (System.currentTimeMillis() - startTime));

//Assert that the time difference is greater than 4000

assertTrue("Time difference must be greater than 4000 milliseconds",

(System.currentTimeMillis() - startTime) > 4000);

}

//Close Driver

@AfterClass

public static void quitDriver() {

driver.quit();

}

Console Output:

javascript_11

Second Example: Injecting a XMLHttpRequest with POST Method

Our test site is: http://phppot.com/demo/jquery-dependent-dropdown-list-countries-and-states/

It contains a getState(val) function to gather cities according to the country parameter.

javascript_15

Before selecting country lets open Firefox or Chrome’s network tab and then select “USA” as a country.
Then you will see the POST request details as shown below:

Headers:
You can see the all details about headers as shown below.

javascript_12

Post:
Then click the POST tab to see parameters that we send by POST method. In this example our parameter is “country_id” and its value is “5”.

javascript_13

Response:
In this tab, you can see the response of the POST method.

javascript_14

Now it is time to test below scenario.

Select USA as a country.
Use executeAsyncScript() method to wait callback function executed. It signals that async execution has finished.
Assert that response contains “New York”

Test Code:

package Javascript;

import org.junit.AfterClass;

import org.junit.BeforeClass;

import org.junit.Test;

import org.openqa.selenium.JavascriptExecutor;

import org.openqa.selenium.UnhandledAlertException;

import org.openqa.selenium.WebDriver;

import org.openqa.selenium.firefox.FirefoxDriver;

import java.util.concurrent.TimeUnit;

import static org.hamcrest.Matchers.containsString;

import static org.junit.Assert.assertThat;

/**

* Created by ONUR BASKIRT on 25.01.2016.

public class ExecuteAsyncXMLHttpRequestTest {

static WebDriver driver;

private static String url = "http://phppot.com/demo/jquery-dependent-dropdown-list-countries-and-states/";

//Setup Driver

@BeforeClass

public static void setupTest() {

driver = new FirefoxDriver();

driver.navigate().to(url);

driver.manage().window().maximize();

}

@Test

public void sendXMLHTTPRequestTest() {

Object response = null;

//Set ScriptTimeout

driver.manage().timeouts().setScriptTimeout(10, TimeUnit.SECONDS);

//Declare JavascriptExecutor

JavascriptExecutor js =(JavascriptExecutor)driver;

//Injecting a XMLHttpRequest and waiting for the result

//Ref1: https://seleniumhq.github.io/selenium/docs/api/java/org/openqa/selenium/JavascriptExecutor.html

//Ref2: http://www.openjs.com/articles/ajax_xmlhttp_using_post.php

try {

response = js.executeAsyncScript(

//Declare callback first!

"var callback = arguments[arguments.length - 1];" +

//Declare url, parameters and method for POST

//Send country_id=5 (USA)

"var http = new XMLHttpRequest();" +

"var url = 'get_state.php';" + //url

"var params = 'country_id=5';" + //parameters

"http.open('POST', url, true);" +

//Send the proper header information along with the request

"http.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');" +

"http.setRequestHeader('Content-length', params.length);" +

"http.setRequestHeader('Connection', 'close');" +

//Call a function when the state changes.

"http.onreadystatechange = function() {" +

" if(http.readyState == 4) {" +

" callback(http.responseText);" +

" };" +

"};" +

"http.send(params);");

} catch (UnhandledAlertException e) {

System.err.println("Error Occured!");

}

//Assert that returned cities are related with USA

System.out.println((String)response);

assertThat((String) response, containsString("<option value="4">New York</option>"));

}

//Close Driver

@AfterClass

public static void quitDriver() {

driver.quit();

}

Console Output:

javascript_16

References

[1] https://seleniumhq.github.io/selenium/docs/api/java/org/openqa/selenium/JavascriptExecutor.html

By Onur Baskirt| January 27th, 2016|Selenium, Test Automation, Web Automation|11 Comments

About the Author: Onur Baskirt

Onur Baskirt is a senior IT professional with 10+ years of experience. He worked at Bahçesehir University, ST Microelectronics, Huawei and Ericsson as research assistant, design verification engineer and software test leader. Also, he worked as software test leader and software operations manager at Turkey's biggest technology retailer, Teknosa. Now, he is working as Head of Software Testing and Manager of two Development Teams at Kariyer.net. His current research areas are technical software testing, programming, and computer science. Formerly, he has several research works and papers on digital chip design & verification. His hobbies are sport, dancing, traveling, and nutrition. You can find detailed information about him on his linked-in page.

11 Comments

Nitish March 6, 2016 at 1:50 pm - Reply

Gained a lot of information and techniques through this article !
Manoj Pahuja March 10, 2016 at 4:21 am - Reply

Very useful
Vladimir Belorusets March 11, 2016 at 4:57 am - Reply

Very good work!
Sampath May 4, 2016 at 5:49 pm - Reply

Thanks a lot for sharing,

Can you share your thoughts on how to perform with DragAndDrop Action using javascript?
- Onur Baskirt May 5, 2016 at 2:28 am - Reply
  
  Hi Sampath,
  
  Thanks for your valuable comments. I suggest you to check below two links.
  
  Python Version: http://stackoverflow.com/questions/29381233/how-to-simulate-html5-drag-and-drop-in-selenium-webdriver#_=_
  Java Version: https://github.com/vikramvi/Selenium-Java/commit/a1354ca5854315fded8fc80ba24a4717927d08c7
Sumanta September 8, 2016 at 3:22 pm - Reply

I have one question on selenium…..How to scroll up or down on modal pop-up window? When i try to scroll the modal pop-up by programmatically, it only scrolls the background page but not the modal pop-up. Anybody can help me on this?
- Onur Baskirt September 8, 2016 at 8:32 pm - Reply
  
  Maybe you can try this with JAVASCRIPTEXECUTOR $(‘#yourmodal-id’).scrollTop($(‘#suggestDetails’).offset().top);
  
  Also, please check this solutions on stackoverflow:
  http://stackoverflow.com/questions/22709200/selenium-webdriver-scrolling-inside-a-div-popup
  http://stackoverflow.com/questions/28212634/scrolling-to-a-element-in-bootstrap-modal-in-web-driver-is-not-working
Amol September 26, 2016 at 1:34 pm - Reply

Hello Onur,

Can you please help me understand what is wrong in the below mentioned

return (boolean) js.executeScript(“$(arguments[0]).hasAttribute($(arguments[1‌]))”, element, attr);…..element is the WebElement and attr is the attribute which I want to search in the element and js is the JavaScriptExecutor
- Onur Baskirt September 26, 2016 at 1:54 pm - Reply
  
  Hi Amol,
  
  Please try below code.
  
  JavascriptExecutor js = (JavascriptExecutor) driver;
  WebElement element = driver.findElement(By.linkText(“Click ME”)); //This should be your element
  return js.executeScript(“arguments[0].hasAttribute(‘attr’)”,element);
  
  Reference: http://stackoverflow.com/questions/19934703/how-to-use-javascript-to-set-attribute-of-selected-web-element-using-selenium-we
Sri Laks December 20, 2016 at 12:49 am - Reply

Hi Onur

I want to login to facebook and post. Able to login to facebook. Once i logged in, we have placeholder to post. It is being displayed as “What’s in your mind”.

I am able to control the container through javascript executor but unable to click. It means we have to make the container to be active to click. Do we really need to use Javascript executor or any other way to click and post in facebook (our) home page. Can i request you to clarify? Please do the needful. Please input facebook credentials to run this below code.

import org.openqa.selenium.By;
import org.openqa.selenium.JavascriptExecutor;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.firefox.FirefoxDriver;
import org.openqa.selenium.interactions.Actions;
import org.openqa.selenium.support.ui.ExpectedConditions;
import org.openqa.selenium.support.ui.WebDriverWait;

public class FBTextArea {

WebDriver driver;

public FBTextArea()
{
driver = new FirefoxDriver();
}

private void login(String userName, String password)
{
driver.get(“http://www.facebook.com”);
driver.findElement(By.id(“email”)).sendKeys(userName);
driver.findElement(By.id(“pass”)).sendKeys(password);
driver.findElement(By.id(“loginbutton”)).click();
}

private WebElement waitAndGet(By by)
{
WebDriverWait wait = new WebDriverWait(driver, 30);
return wait.until(ExpectedConditions.visibilityOfElementLocated(by));
}

public void textAreaPostActions()
{
JavascriptExecutor js = (JavascriptExecutor) driver;
js.executeScript(“document.getElementById(‘feedx_container’).style.display=’block'”);
js.executeScript(“arguments[0].click();”, driver.findElement(By.xpath(“//div[@class=’_1mf _1mj’]”)));
}
public static void main(String[] args) {

FBTextArea Fbt = new FBTextArea();
Fbt.login(“”,””);
Fbt.textAreaPostActions();

}

}
- SW Test Academy January 15, 2017 at 6:26 pm - Reply
  
  Hi Sri,
  
  As I know you are doing the right. I really could not figure out whats wrong with that solution. Maybe it is better to put some breakpoints and some debugging texts in your code and examine the problem. If you find a solution, please let us know. One more thing if the page use AJAX call, it is better to wait it with Jquery active property as shown below. Reference: http://stackoverflow.com/questions/33348600/selenium-wait-for-ajax-content-to-load-universal-approach
  
  public boolean waitForJSandJQueryToLoad() {
  
  WebDriverWait wait = new WebDriverWait(driver, 30);
  
  // wait for jQuery to load
  ExpectedCondition jQueryLoad = new ExpectedCondition() {
  @Override
  public Boolean apply(WebDriver driver) {
  try {
  return ((Long)((JavascriptExecutor)getDriver()).executeScript(“return jQuery.active”) == 0);
  }
  catch (Exception e) {
  // no jQuery present
  return true;
  }
  }
  };
  
  // wait for Javascript to load
  ExpectedCondition jsLoad = new ExpectedCondition() {
  @Override
  public Boolean apply(WebDriver driver) {
  return ((JavascriptExecutor)getDriver()).executeScript(“return document.readyState”)
  .toString().equals(“complete”);
  }
  };
  
  return wait.until(jQueryLoad) && wait.until(jsLoad);
  }