Answers for "javascript check if div is visible"

check if element is visible

.is(':visible')
//Selects all elements that are visible.

if($('#Div').is(':visible')){
	// add whatever code you want to run here.
}

$('#yourDiv:visible').callYourFunction();

js check if element hidden

if (elem.getAttribute("hidden") != null){
  //code if elem is hidden
}

javascript check if visible

window.getComputedStyle(document.getElementById("mydivID"),null).getPropertyValue('display')