WebDriverWait(Handles AJAX) Fundamental - Selenium

public class testclass {
    public static void main(String[] args) {
        WebDriver driver = new FirefoxDriver();
        driver.get("http://somedomain/url_that_delays_loading");
     

 // Below is one way of implemening
          WebElement myDynamicElement = (new WebDriverWait(driver, 10)).until(new ExpectedCondition<WebElement>(){
            @Override
            public WebElement apply(WebDriver d) {
                return d.findElement(By.id("myDynamicElement"));
            }});
  
//Second easy way of implementing
       WebDriverWait wait = new WebDriverWait(driver, 10);
        WebElement element = wait.until(ExpectedConditions.presenceOfElementLocated(By.id("someid")));

          }} 


   
    }}

Above is explicit wait where you define code to wait for a certain condition to occur before proceeding further in the code. WebDriverWait in combination with ExpectedCondition is one way this can be accomplished.

This waits up to 10 seconds before throwing a TimeoutException or if it finds the element will return it in 0 - 10 seconds. WebDriverWait by default calls the ExpectedCondition every 500 milliseconds until it returns successfully. A successful return is for ExpectedCondition type is Boolean return true or not null return value for all other ExpectedCondition types.


Expected Condition :  There are some common conditions that are frequently come across when automating web browsers. Listed below are Implementations of each. Java happens to have convienence methods so you don’t have to code an ExpectedCondition class yourself or create your own utility package for them. Refer below for some of the condition

http://selenium.googlecode.com/svn/trunk/docs/api/java/org/openqa/selenium/support/ui/ExpectedConditions.html


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Handling Ajax Droplist - Google Autosuggest



There is nothing special about how to get the value of Ajax Droplist. The below code is self-explanatory.

 Few points in below code : 
1) The suggestion are in Table.
2) The number of suggestion is unknown at compile time, so we have to use increasing variable for creating xpath of suggestion element
3) Since loop to get all element will run indefinately so NoSuchElement exception needs to be handled.


package test;
import org.openqa.selenium.By;
import org.openqa.selenium.NoSuchElementException;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.firefox.FirefoxDriver;
public class googleajaxlist {
 public static void main(String[] args) throws InterruptedException{
 
  WebDriver driver = new FirefoxDriver();
  driver.get("https://www.google.com");
  driver.findElement(By.xpath("//input[@class='gbqfif']")).sendKeys("harp");
  Thread.sleep(4000);    //This sleep is to make sure suggestion got is for word we want.
  int  i = 1;
  String xp;
 
  try {
 
  while(true){
   System.out.println(String.valueOf(i));  // Needs to convert integer variable to String 
   xp= "//*[@id='gsr']/table/tbody/tr/td[2]/table/tbody/tr[" + String.valueOf(i) + "]/td/div/table/tbody/tr/td[1]";  //variable xpath string
   System.out.println(xp);
   System.out.println(driver.findElement(By.xpath(xp)).getText()) ;  // getText() is used to get the suggestion text
   i++;
 
  }
 
  } catch ( NoSuchElementException e ) {};  //Exception handling is done for non-existing element at end of the loop
 
 
   }

}