Ggtcf

I am trying to select some value in the Device drop down but I am getting the error - element not intractable: Element is not currently visible and may not be manipulated

We are using knockout js for our application.
The drop down is not even opening.

I am using xpath - "//select[@class='deviceType']"

I am able to use webdriver wait for this that means there is no problem with the xpath but I am not able select the value in the dropdown

 Select device = new Select(deviceDrpDwn);
 device.selectByVisibleText(deviceOption);

This is the code I am using to select the drop down value. The dropdown is not opening.

HTML code:
<div class="span9 select-device">
 <!-- ko if: sdeviceConfigMap -->
 <label data-bind="text: ovd.ui.admin.hart.device">Device (Manufacturer ID, Device Type, User Extension, Characterization)</label>
 <select tabindex="16" class="deviceType" data-bind="value: sselectedDeviceConfig, 
 optionsCaption : ovd.ui.admin.hart.selectDevice, 
 options: sdeviceConfigMap,
 optionsText: 'name',
 optionsValue: 'config_id', 
 event: change: associateConfigWithValve"><option value="">Select Device</option><option value="20">Dresser Masoneilan, SVI II AP / H7, initial, Linear</option><option value="21">Dresser Masoneilan, SVI II AP / H7, initial, Equal % (30)</option><option value="22">Dresser Masoneilan, SVI II AP / H7, initial, Quick Opening</option><option value="23">Dresser Masoneilan, SVI II AP / H7, initial, Linear</option></select>
 <!-- /ko -->
 </div> 

Your element is not visible at the time of Webdriver inteacting.Please wait for the element to be visible.

WebDriverWait wait=new WebDriverWait(driver,40); 
Select select=new Select(wait.until(ExpectedConditions.visibilityOfElementLocated(By.xpath("//select[@class='deviceType']"))));
select.selectByIndex(1); //n=1,2...n

or
select.selectByVisibleText(arg0);

This worked for me:

WebElement dropdown = driver.findElement(By.xpath( "//select[@class='deviceType']"));
dropdown.sendKeys(deviceOption);