How will you close all the Popups for a particular parent window when it is closed? using javascript

256.

Create an object for every window while opening. Using the object name you can close the child windows.

window.childs.close()

window.child.document.close()

var w1 = window.open('some url')
var w2 = window.open('some url')
var w3 = window.open('some url')

w1.close()
w2.close()
w3.close()