Add HTML Elements to XUL Addons
I've been working on a new addon at Mozilla which isn't anywhere near finished so I wont bother telling you what it's meant to do...because it could change at any moment. Since this is my first real addon, it's been a struggle, but that's a good thing -- it means I'm learning a ton. One problem I ran into was trying to get a checkbox (INPUT) element within the addon via JavaScript -- nothing was displaying.
After a bit of research and guesswork, I figured out what I was doing wrong -- I was using the wrong document method to create the element:
var input = document.createElementNS("http://www.w3.org/1999/xhtml", "input");
Using document.createElementNS with the proper namespace resulted in my checkbox displaying in all of its glory. It's beautiful square, checked glory. Firefox addons can be created in a number of ways so if you're looking to create your own and you aren't seeing HTML elements correctly, keep this solution in mind!
![Page Visibility API]()
One event that's always been lacking within the document is a signal for when the user is looking at a given tab, or another tab. When does the user switch off our site to look at something else? When do they come back?
![Responsive Images: The Ultimate Guide]()
Chances are that any Web designers using our Ghostlab browser testing app, which allows seamless testing across all devices simultaneously, will have worked with responsive design in some shape or form. And as today's websites and devices become ever more varied, a plethora of responsive images...
![Printing MooTools Accordion Items]()
Sometimes we're presented with unforeseen problems when it comes to our JavaScript effects. In this case, I'm talking about printing jQuery and MooTools accordions. Each "closed" accordion content element has its height set to 0 which means it will be hidden when the...
![Scrolling “Agree to Terms” Component with MooTools ScrollSpy]()
Remember the good old days of Windows applications forcing you to scroll down to the bottom of the "terms and conditions" pane, theoretically in an effort ensure that you actually read them? You're saying "No David, don't do it." Too late -- I've done...
Reminded me of my initial days with JavaScript David! I also made the same namespace errors and then wondered for hours, what went wrong!