Frequently Asked Questions
- Another JavaScript library? Really?
-
There is good and bad in every library, mainly brought about by the goals of their core
developers. Jelo was built to meet the following needs:
- High performance. Libraries must be fast and reliable, the whole point is to save you development time.
- Small filesize. No bulky widgets or code you'll rarely use. This saves you bandwidth and your end users download time.
- Throw errors when appropriate. Libraries that advertise "no errors!"
can be a nightmare to debug. If you don't know what you did wrong, you can't fix it.
Developers can (and should) use
try / catch
blocks to hide errors from end users in production, but must be able to rely on informational errors during development. - Work with JavaScript, not against it. Jelo makes writing cross-browser compatible JavaScript easy, but it doesn't require you to learn a completely new syntax or language. Rather than changing the way JavaScript works, Jelo uses the natural features of the language to smooth the learning curve.
- How do I execute code as soon as the page is done loading?
-
Jelo.onReady(fn)
adds a function to be executed once the page's DOM is ready. You can callJelo.onReady
more than once; each function will be executed in the order it was added.Jelo.onReady(function() { alert("the document is loaded"); }); var myFunction = function() { alert("both functions will execute on page load"); }; Jelo.onReady(myFunction);
- How do I grab elements on the page?
-
Jelo uses the "dollar sign function", like most JavaScript libraries.
$(selector)
is shorthand forJelo.Dom.selectNode
, which returns the first matching element.$$(selector)
(short forJelo.Dom.select
) works the same way, but returns an array of matching elements. The selector is any valid CSS selector, for example:- $("img") matches the FIRST image on the page.
- $$("img.thumbnail") matches all images with class "thumbnail".
- $$("#navigation a") matches all links inside the element with id "navigation".
- $("#navigation a") matches the FIRST link inside the element with id "navigation".
- $$("input[type=text]") matches all textfields (input elements whose type attribute is "text").
- Who's the author?
- I'm HB Stone, a Senior Applications Developer in Palm Desert, CA. My languages of choice are JavaScript and PHP, but I'm familiar with several other web and desktop programming languages. I mostly write custom software solutions for projects such as touchscreen vending machines, multifunction ATMs, educational and commercial kiosks. I also do my fair share of graphic design, web design, web development, and SEO.