How can I check using JavaScript, if an HTML element is a child of a particular <div> element?
if (divElement == child){ // do something... } EDIT: Thank you for the answers. I also had a similair question about descendants and found the answer here Check if div is descendant of another
you can check either starting from parent element, or child element.
1- check if current element is inside the parent element parentEl.contains(el)
or
2- current element's parent is the parentElement we have stored el.parentNode === parentEl
The following code may help you determine whether the two elements of parent-child relationships.
function isChild (obj,parentObj){ while (obj != undefined && obj != null && obj.tagName.toUpperCase() != 'BODY'){ if (obj == parentObj){ return true; } obj = obj.parentNode; } return false; } then use the result of isChild call as condition if statement.
if(isChild(child,divElement)){ // doSomething... } 
if (element.parentNode == divElement) { ... } use contains function of Node - divElement.contains(child)
or this function in case contains does not exists.
function contains(first, second) { var adown = first.nodeType === 9 ? first.documentElement : first; if (first === second) { return true; } if (adown.contains) { return adown.contains(second); } return first.compareDocumentPosition && first.compareDocumentPosition(second) & 16); } in case you need to return false when the nodes are the same
function notContains(first, second) { var adown = first.nodeType === 9 ? first.documentElement : first; if (first === second) { return false; } if (adown.contains) { return !adown.contains(second); } return first.compareDocumentPosition && first.compareDocumentPosition(second) & 16) !== 16; } Use nodeName to check
if(elementObj.parentElement.nodeName == "DIV"){ //Your Code } 
element.parentNode === divElement?