JavaScript print Events

By  on  

Media queries provide a great way to programmatically change behavior depending on viewing state. We can target styles to device, pixel ratio, screen size, and even print. That said, it's also nice to have JavaScript events that also allow us to change behavior. Did you know you're provided events both before and after printing?

I've always used @media print in stylesheets to control print display, but JavaScript provides beforeprint and afterprint events:

function toggleImages(hide = false) {
  document.querySelectorAll('img').forEach(img => {
    img.style.display = hide ? 'none' : '';
  });
}

// Hide images to save toner/ink during printing
window.addEventListener('beforeprint', () => toggleImages(true))
window.addEventListener('afterprint', () => toggleImages());

It may sound weird but considering print is very important, especially when your website is documentation-centric. In my early days of web, I had a client who only "viewed" their website from print-offs. Styling with @media print is usually the best options but these JavaScript events may help!

Recent Features

  • By
    CSS 3D Folding Animation

    Google Plus provides loads of inspiration for front-end developers, especially when it comes to the CSS and JavaScript wonders they create. Last year I duplicated their incredible PhotoStack effect with both MooTools and pure CSS; this time I'm going to duplicate...

  • By
    Create Namespaced Classes with MooTools

    MooTools has always gotten a bit of grief for not inherently using and standardizing namespaced-based JavaScript classes like the Dojo Toolkit does.  Many developers create their classes as globals which is generally frowned up.  I mostly disagree with that stance, but each to their own.  In any event...

Incredible Demos

Discussion

    Wrap your code in <pre class="{language}"></pre> tags, link to a GitHub gist, JSFiddle fiddle, or CodePen pen to embed!