JavaScript Document Onload + TypeScript version

Posted by Dmitry

Updated on

🗃 This article is a part of the JavaScript Basics series.
javascript browser DOM snippet basics

Here is a straightforward way to catch document loading. It's supported by modern browsers. You can use it as an alternative to jQuery $.ready.

function domReady(cb) {
  if (document.readyState === "complete" || document.readyState === "interactive") {
    cb();
  } else {
    document.addEventListener("DOMContentLoaded", cb);
  }
}


domReady(() => {
  console.log("DOM: I'm ready");
});

TypeScript Version

function domReady(cb: Function): void {
  if (document.readyState === "complete" || document.readyState === "interactive") {
    cb();

  } else {
    document.addEventListener("DOMContentLoaded", (event: Event) => {
      cb();
    });
  }
}
Keep in mind that DOMContentLoaded fires when HTML is loaded and parsed. It's not waiting for external stylesheets and scripts to load. You can consider using window load event.

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