A JavaScript exception occurred: Can't find variable: $' error message is displayed

Question

On using below JavaScript Event code :

JavascriptExecutor jsExecutor = (JavascriptExecutor) driver; 
jsExecutor.executeScript("$(arguments[0]).change();", WebElement);

JavaScript Error:

A JavaScript exception occurred: Can't find variable: $' error message is displayed.

I am not aware of jQuery, could any one let me know how to solve this error? Thanks in advance.

Answer 1

I am assuming that you are trying to trigger the change event by using the below syntax

jsExecutor.executeScript("$(arguments[0]).change();", WebElement);

The problem is that Selenium Web Driver does not have access to JQuery library. $('') is part of JQuery.

Try using pure javascript to trigger the change event.

element.onchange();

How can I trigger an onchange event manually?

Answer 2

The standard way to invoke the function executeScript() is as follows :

WebElement element = driver.findElement(By.xpath("xpath_of_element"));
JavascriptExecutor jsExecutor = (JavascriptExecutor) driver; 
jsExecutor.executeScript("arguments[0].change();", element);