Chrysto Panayotov weblog
Html5, CSS3, JavaScript and Flash snippets.
In a recent project, I had to deal with this task – writing and event handler to detect click events outside an element. The first thing that came to mind was listening for click events somewhere higher in the DOM hierarchy ( can be parent element, or the window object for example ). Then, I can determine the element that triggered the event and all the elements, through the event bubble .
Here is the final result:
See the Pen Click outside element by Chrysto (@burnandbass) on CodePen
For some scrolling effects, you may need to know how much percent the page is scrolled. All we need is to know for that is the window height, window top position and document height.
[button url=”http://bassta.bg/demos/scroll-percent/” style=”green” size=”large” type=”square” icon=”view” target=”_blank”] VIEW DEMO [/button] [button url=”http://bassta.bg/downloads/scroll-percent.zip” style=”blue” size=”large” type=”square” icon=”download” target=”_blank”] DOWNLOAD FILES [/button]
These are two very helpful JavaScript functions if you need to work with ranges and percents.
function rangeToPercent(number, min, max){
return ((number - min) / (max - min));
}
This function returns percentage of a number in a given range. For example rangeToPercent(40,20,60) will return 0.5 (50%). rangeToPercent(34,0,100) will return 0.34 (34%)
function percentToRange(percent, min, max) {
return((max - min) * percent + min);
}
This function returns number that corresponds to the percentage in a given range. For example percentToRange(0.34,0,100) will return 34.
Original functions are part of MathUtils Class by Bruno Imbrizi written in ActionScript3.
This is JS syntax of the AS3 bound() function I use for my flash projects.
function bound(_number, _min, _max){
return Math.max(Math.min(_number, _max), _min);
}
The function takes 3 parametes:
_number is the number you want to restrict.
_min is the minimal value.
_max is the maximum value.
If the _number is less than _min, the function returns the _min value. If the _number is greater than _max, the function returns _max value. This is a way to ensure you number will be within this minimum and maximum bounds.
Example:
console.log(boundrary(10,5,15)); // returns 10 console.log(boundrary(2,5,15)); // returns 5 console.log(boundrary(100,5,15)); // returns 15
[highlight]Update: 14 aug 2013 [/highlight]
The snippet is can be found at javascriptcookbook website: http://www.javascriptcookbook.com/article/Restrict-a-number-to-a-range
If you need to get the scroll of the mouse wheel ( mouse event delta ) you can use this script:
$(window).on("mousewheel DOMMouseScroll", function(event){
var delta = event.originalEvent.wheelDelta/120 || -event.originalEvent.detail/3;
console.log(delta);
event.preventDefault();
});
You can also check the jQuery Mousewheel Plugin by Brandon Aaron
When it comes to animation, Greensock Animation Platform (GSAP) is one of the most popular platforms around. It is available in both JavaScript and ActionScript with similar syntax and is amazingly fast. Actually, it performs up to 20 times faster than than jQuery’s native animate() method! It is very easy to use it in your project, thanks to greensock’s awesome plugin that overrides default jQuery animate() method and use TweenLight/TweenMax under the hood. All you have to do is to include TweenMax and the plugin and you’re done.
Once you’ve included the plugin you’re able to use the full power ot TweenMax – it is possible to tween CSS properties such as color, box-shadow, text-shadow, 2D and 3D transforms, background position and many more. GSAP use the same syntax as jQuery and takes care of browser specific code, such as vendor prefixes.
Sometimes you need to retrive the current URL of the page. It is very easy in jQuery style:
var currentURL = $(location).attr("href");
It can be very useful for social plugins. You can learn more about location object on w3schools.
Most of the troubles with flash fonts comes from the name of the embeded font. This is a simple way to view all fonts, embeded into the flash project.
import flash.text.Font;
trace('available fonts [' + Font.enumerateFonts().map(function(e:*, i:int, arr:Array):String { return e.fontName }) + ']');