Set a callback function to a new window in javascript

Updated for comments: If you’re opening your window via then in your child page you can set a function in the child to just be a reference pointing to a parent function, so have this in the child page:

var RunCallbackFunction = function() { }; //reference holder only

Then in your parent (opener), set that function when that child window loads, like this:

//random function you want to call
function myFunc() { alert("I'm a function in the parent window"); }

//to actually open the window..
var win ="window.html");
win.onload = function() { win.RunCallbackFunction = myFunc; };

This assigns the function in your parent to now be the target of that child…and you can point each child to a different function if you wish, they’re all independent.

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