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base.js
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base.js
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/**
* @fileoverview Base for helper functions and other globals.
* @author mking@mking.me (Matt King)
*/
/**
* Used globally to determine if functionality should be
* degraded for older browsers. Currently applies to IE7 and older.
*/
var degraded = false;
if (typeof String.prototype.trim !== 'function') {
/**
* Add trim function to all Strings.
* @return {String} String trimmed of whitespace.
*/
String.prototype.trim = function() {
return this.replace(/^\s+|\s+$/g, '');
};
}
/**
* Wrapper function to minimize global namespace pollution.
* @return {Object} external API to inner functions.
*/
var io = (function() {
/**
* Shortcut to get DOM elements by ID.
* @param {String} node ID of element to find.
* @return {Object} DOM element.
*/
var el = function(node) {
return document.getElementById(node);
};
/**
* Wraps an event listener function to normalize event attributes.
* Used for IE event handling.
* @param {Function} func event handler function.
* @return {Function} Event handler that calls original function
* with modified event object.
*/
var ensureEvent = function(func) {
return function() {
var e = window.event;
e.target = e.srcElement;
e.preventDefault = function() {
e.returnValue = false;
};
e.stopPropagation = function() {
e.cancelBubble = true;
};
func.call(e.srcElement, e);
};
};
/**
* Cross-browser support for adding event listeners.
* Overwrites itself based on if it's IE-style or W3C-style.
* @param {String} evnt Event name.
* @param {Object} elem DOM element to attach event to.
* @param {Function} Func event callback function to apply.
*/
var listen = function(evnt, elem, func) {
if (elem.addEventListener) {
listen = function(evnt, elem, func) {
elem.addEventListener(evnt, func, false);
};
} else if (elem.attachEvent) {
listen = function(evnt, elem, func) {
elem['on' + evnt] = ensureEvent(func);
};
}
listen(evnt, elem, func);
};
/**
* Cross-browser support for removing event listeners.
* Overwrites itself based on if it's IE-style or W3C-style.
* @param {String} evnt Event name.
* @param {Object} elem DOM element to attach event to.
* @param {Function} Func event callback function to apply.
*/
var unlisten = function(evnt, elem, func) {
if (elem.removeEventListener) {
unlisten = function(evnt, elem, func) {
elem.removeEventListener(evnt, func, false);
};
} else if (elem.attachEvent) {
unlisten = function(evnt, elem, func) {
elem['on' + evnt] = null;
};
}
unlisten(evnt, elem, func);
};
/**
* Map a function to each item in an array.
* @param {Array} a Array of items to apply function to.
* @param {Function} f Function to apply.
* @return {Array} New array with items returned by function.
*/
var map = function(a, f) {
var out = [];
for (var i = 0, len = a.length; i < len; i++) {
out[i] = f.call(a, a[i]);
}
return out;
};
/**
* Public interface
* @return {Object} The io object.
*/
return {
el: el,
listen: listen,
unlisten: unlisten,
map: map
};
}());