How to check if an element exists in jQuery?
When we use dynamic elements in jQuery then sometimes you should check whether elements exits or not before performing a certain action on that element. In such cases, you can use jQuery .length property to determine if your selector matched anything in the webpage.
jQuery show() method
In jQuery , it isn't always necessary to test whether an element exists or not . The following code will show the element if it exists, and do nothing (with no errors) if it does not exists.