JavaScript tap event for touch devices

JavaScript touch events are awesome and they are standardized (Candidate recommendation) by the W3C, making them safe to use for building your touch enabled web-apps. There are 4 touch events:

  1. "touchstart" - When a finger in placed on the screen
  2. "touchmove" - When a finger moves on the screen
  3. "touchend" - When a finger is lifted from the screen
  4. "touchcancel" - When touch is canceled, like when an alert appears or a call comes in.
But, what constitutes a "tap", like a "click" in the mouse model you might wonder. There a several answers to this. A tap might be simply a "touchend". But, what if the user places a finger on a button and then flicks the screen up so that the button goes off screen, now the button will fire a "touchend" when it's off screen. And what if the user holds a button for a long time and then lets go, should that fire an event?

To combat these issues I've created a Javascript library (and a jQuery plugin) which will handle all of this for you. You simply add the library or plugin to your project and then you add the spanking new "tap" event to your button or what have you. The "tap" library will then try to take care of the issues mentioned above.

Using it is simple:
 var tapHandler = function(e){  
    //Do something  

Take a look at the documentation inside of the source files and of course, look at the demo.

Form input placeholder shiv

As part of the HTML 5 form features, the attribute "placeholder" was introduced for input elements supporting text input (including password). This is awesome and does indeed make form input elements not only more accessible, but it also paves the way for "label less" UI on devices with no so much screen real-estate. However, as with all new things HTML 5 this too is not fully supported on every major browser. Enter the not so elegantly named "placeholderShiv".

I wrote this library to enable the "placeholder" feature in every browser. It will basically grab all the valid input elements and append to them functionality which will mimic the native placeholder feature. All you need to do is to assign values to the input elements and add the library of your choice. This value will be turned into a placeholder text. Try the demo to see it in action.

«PlaceholderShiv» comes in three versions, a Coffeescript version, a JavaScript version and a jQuery plugin. The Coffeescript and the JavaScript ones does not have any dependencies on any other libraries and they are somewhat faster than the jQuery plugin. However, the jQuery version will support browsers which does not implement "addEventListener" and it is somewhat easier to use if you're already using jQuery.