Check if an element is visible in viewport

Hi Friends,
Many times we get into a situation where we want to know whether an element exists within a viewport of browser or not.
Here below. I am writing a function to check whether an elements exists in a viewport or not.
It will return true or false and by using this, one can use it in different situations.
.

First we will store the DOM element into a variable

var element = document.getElementById("element_id");

Case 1: If we want to know element is completely inside the viewport.

function checkIfElementIsWithinViewport(element) {    if((element != undefined) && (element != null)) {        var element_offets = el.getBoundingClientRect();

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