Question

If I send a header() using PHP to javascript via AJAX which then writes the output using document.write, will that initiate the javascript onload function if document.write writes the entire page? I need it to initiate

Answer 1

The real question is whether document.write after the initial DOM has loaded will re-call the document’s onLoad function.

It’s trivially testable, and the answer is “no”:

$(function() {
    document.write("lol");
    // ^ interestingly, `console` doesn't appear to exist after this

    alert("onload"); // only happens once
});