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I am trying to automate upload file functionality in Google Drive.

The element used to pass parameters is hidden with height - 0px.

None of the user actions would make this element visible. So I need a work around to click on the element while it is not visible.

<input type="file" style="; visibility: hidden; position: absolute; width: 340px; font-size: inherit;" multiple=""/>
The xpath for the above element is -
//*[@class='goog-menu goog-menu-vertical uploadmenu density-tiny']/input
I am using
WebDriver.findElement(By.xpath(<xpath>).sendKeys(<uploadFile>)
Exception -
org.openqa.selenium.ElementNotVisibleException
Element is not currently visible and so may not be interacted with.
I have tried using JavascriptExecutor. But unable to find the exact syntax.
                Take a look at the HTML, is Google Drive just a form? If so, don't use Selenium, just write a script to post a form with data you specify.
– jasop
                Sep 11, 2012 at 5:06
WebElement elem = yourWebDriverInstance.findElement(By.xpath("//*[@class='goog-menu goog-menu-vertical uploadmenu density-tiny']/input"));
String js = "arguments[0].style.height='auto'; arguments[0].style.visibility='visible';";
((JavascriptExecutor) yourWebDriverInstance).executeScript(js, elem);
The above bunch would change the visibility of your file input control. You can then proceed with the usual steps for file upload like:
elem.sendKeys("<LOCAL FILE PATH>"); 
Be aware, by changing the visibility of an input field you are meddling with the application under test. Injecting scripts to alter behavior is intrusive and not recommended in tests. 
WebElement tmpElement = driver.finElement(ElementLocator);
JavascriptExecutor executor = (JavascriptExecutor)driver;
executor.executeScript("arguments[0].click();", tmpElement);
JavascriptExecutor executor= (JavascriptExecutor)driver;
executor.executeScript("document.getElementById('ID').style.display='block';");
Select select = new Select(driver.findElement(By.id("ID")));
select.selectByVisibleText("value");
Thread.sleep(6000);
By using java script executor and make the element visible then click on the element through ID. Hope it hepls..
WebElement elem = yourWebDriverInstance.findElement(
   By.cssSelector(".uploadmenu > input"));
String js = 
  "arguments[0].style.height='auto'; arguments[0].style.visibility='visible';";
((JavascriptExecutor) yourWebDriverInstance).executeScript(js, elem);
Here I have replaced XPath by CSS Selector. Let me know Is the above scripting is working or not.
        
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