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helper.js
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helper.js
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/*
* MBP - Mobile boilerplate helper functions
*/
(function(document){
window.MBP = window.MBP || {};
// Fix for iPhone viewport scale bug
// http://www.blog.highub.com/mobile-2/a-fix-for-iphone-viewport-scale-bug/
MBP.viewportmeta = document.querySelector && document.querySelector('meta[name="viewport"]');
MBP.ua = navigator.userAgent;
MBP.scaleFix = function () {
if (MBP.viewportmeta && /iPhone|iPad|iPod/.test(MBP.ua) && !/Opera Mini/.test(MBP.ua)) {
MBP.viewportmeta.content = "width=device-width, minimum-scale=1.0, maximum-scale=1.0";
document.addEventListener("gesturestart", MBP.gestureStart, false);
}
};
MBP.gestureStart = function () {
MBP.viewportmeta.content = "width=device-width, minimum-scale=0.25, maximum-scale=1.6";
};
/*
* Normalized hide address bar for iOS & Android
* (c) Scott Jehl, scottjehl.com
* MIT License
*/
// If we split this up into two functions we can reuse
// this function if we aren't doing full page reloads.
// If we cache this we don't need to re-calibrate everytime we call
// the hide url bar
MBP.BODY_SCROLL_TOP = false;
// So we don't redefine this function everytime we
// we call hideUrlBar
MBP.getScrollTop = function(){
var win = window,
doc = document;
return win.pageYOffset || doc.compatMode === "CSS1Compat" && doc.documentElement.scrollTop || doc.body.scrollTop || 0;
};
// It should be up to the mobile
MBP.hideUrlBar = function(){
var win = window;
// if there is a hash, or MBP.BODY_SCROLL_TOP hasn't been set yet, wait till that happens
if( !location.hash && MBP.BODY_SCROLL_TOP !== false){
win.scrollTo( 0, MBP.BODY_SCROLL_TOP === 1 ? 0 : 1 );
}
};
MBP.hideUrlBarOnLoad = function () {
var win = window,
doc = win.document;
// If there's a hash, or addEventListener is undefined, stop here
if( !location.hash && win.addEventListener ) {
//scroll to 1
window.scrollTo( 0, 1 );
MBP.BODY_SCROLL_TOP = 1;
//reset to 0 on bodyready, if needed
bodycheck = setInterval(function() {
if( doc.body ) {
clearInterval( bodycheck );
MBP.BODY_SCROLL_TOP = MBP.getScrollTop();
MBP.hideUrlBar();
}
}, 15 );
win.addEventListener( "load", function() {
setTimeout(function() {
//at load, if user hasn't scrolled more than 20 or so...
if( MBP.getScrollTop() < 20 ) {
//reset to hide addr bar at onload
MBP.hideUrlBar();
}
}, 0);
} );
}
};
// Fast Buttons - read wiki below before using
// https://github.com/h5bp/mobile-boilerplate/wiki/JavaScript-Helper
MBP.fastButton = function (element, handler) {
this.element = element;
this.handler = handler;
addEvt(element, "touchstart", this, false);
addEvt(element, "click", this, false);
};
MBP.fastButton.prototype.handleEvent = function(event) {
event = event || window.event;
switch (event.type) {
case 'touchstart': this.onTouchStart(event); break;
case 'touchmove': this.onTouchMove(event); break;
case 'touchend': this.onClick(event); break;
case 'click': this.onClick(event); break;
}
};
MBP.fastButton.prototype.onTouchStart = function(event) {
event.stopPropagation();
this.element.addEventListener('touchend', this, false);
document.body.addEventListener('touchmove', this, false);
this.startX = event.touches[0].clientX;
this.startY = event.touches[0].clientY;
this.element.style.backgroundColor = "rgba(0,0,0,.7)";
};
MBP.fastButton.prototype.onTouchMove = function(event) {
if(Math.abs(event.touches[0].clientX - this.startX) > 10 ||
Math.abs(event.touches[0].clientY - this.startY) > 10 ) {
this.reset();
}
};
MBP.fastButton.prototype.onClick = function(event) {
event = event || window.event;
if (event.stopPropagation) { event.stopPropagation(); }
this.reset();
this.handler(event);
if(event.type == 'touchend') {
MBP.preventGhostClick(this.startX, this.startY);
}
this.element.style.backgroundColor = "";
};
MBP.fastButton.prototype.reset = function() {
rmEvt(this.element, "touchend", this, false);
rmEvt(document.body, "touchmove", this, false);
this.element.style.backgroundColor = "";
};
MBP.preventGhostClick = function (x, y) {
MBP.coords.push(x, y);
window.setTimeout(function (){
MBP.coords.splice(0, 2);
}, 2500);
};
MBP.ghostClickHandler = function (event) {
if (!MBP.hadTouchEvent && 'ontouchstart' in window) {
// This is a bit of fun for Android 2.3...
// If you change window.location via fastButton, a click event will fire
// on the new page, as if the events are continuing from the previous page.
// We pick that event up here, but MBP.coords is empty, because it's a new page,
// so we don't prevent it. Here's we're assuming that click events on touch devices
// that occur without a preceding touchStart are to be ignored.
event.stopPropagation();
event.preventDefault();
return;
}
for(var i = 0, len = MBP.coords.length; i < len; i += 2) {
var x = MBP.coords[i];
var y = MBP.coords[i + 1];
if(Math.abs(event.clientX - x) < 25 && Math.abs(event.clientY - y) < 25) {
event.stopPropagation();
event.preventDefault();
}
}
};
if (document.addEventListener) {
document.addEventListener('click', MBP.ghostClickHandler, true);
}
addEvt( document.documentElement, 'touchstart', function() {
MBP.hadTouchEvent = true;
}, false);
MBP.coords = [];
// fn arg can be an object or a function, thanks to handleEvent
// read more about the explanation at: http://www.thecssninja.com/javascript/handleevent
function addEvt(el, evt, fn, bubble) {
if("addEventListener" in el) {
// BBOS6 doesn't support handleEvent, catch and polyfill
try {
el.addEventListener(evt, fn, bubble);
} catch(e) {
if(typeof fn == "object" && fn.handleEvent) {
el.addEventListener(evt, function(e){
// Bind fn as this and set first arg as event object
fn.handleEvent.call(fn,e);
}, bubble);
} else {
throw e;
}
}
} else if("attachEvent" in el) {
// check if the callback is an object and contains handleEvent
if(typeof fn == "object" && fn.handleEvent) {
el.attachEvent("on" + evt, function(){
// Bind fn as this
fn.handleEvent.call(fn);
});
} else {
el.attachEvent("on" + evt, fn);
}
}
}
function rmEvt(el, evt, fn, bubble) {
if("removeEventListener" in el) {
// BBOS6 doesn't support handleEvent, catch and polyfill
try {
el.removeEventListener(evt, fn, bubble);
} catch(e) {
if(typeof fn == "object" && fn.handleEvent) {
el.removeEventListener(evt, function(e){
// Bind fn as this and set first arg as event object
fn.handleEvent.call(fn,e);
}, bubble);
} else {
throw e;
}
}
} else if("detachEvent" in el) {
// check if the callback is an object and contains handleEvent
if(typeof fn == "object" && fn.handleEvent) {
el.detachEvent("on" + evt, function(){
// Bind fn as this
fn.handleEvent.call(fn);
});
} else {
el.detachEvent("on" + evt, fn);
}
}
}
// iOS Startup Image
// https://github.com/h5bp/mobile-boilerplate/issues#issue/2
MBP.splash = function () {
var filename = navigator.platform === 'iPad' ? 'h/' : 'l/';
document.write('<link rel="apple-touch-startup-image" href="/img/' + filename + 'splash.png" />' );
};
// Autogrow
// http://googlecode.blogspot.com/2009/07/gmail-for-mobile-html5-series.html
MBP.autogrow = function (element, lh) {
function handler(e){
var newHeight = this.scrollHeight,
currentHeight = this.clientHeight;
if (newHeight > currentHeight) {
this.style.height = newHeight + 3 * textLineHeight + "px";
}
}
var setLineHeight = (lh) ? lh : 12,
textLineHeight = element.currentStyle ? element.currentStyle.lineHeight :
getComputedStyle(element, null).lineHeight;
textLineHeight = (textLineHeight.indexOf("px") == -1) ? setLineHeight :
parseInt(textLineHeight, 10);
element.style.overflow = "hidden";
element.addEventListener ? element.addEventListener('keyup', handler, false) :
element.attachEvent('onkeyup', handler);
};
// Enable active
// Enable CSS active pseudo styles in Mobile Safari
// http://miniapps.co.uk/blog/post/enable-css-active-pseudo-styles-in-mobile-safari/
MBP.enableActive = function () {
document.addEventListener("touchstart", function() {}, false);
};
// Prevent iOS from zooming onfocus
// http://nerd.vasilis.nl/prevent-ios-from-zooming-onfocus/
MBP.viewportMeta = $('meta[name="viewport"]');
MBP.preventZoom = function () {
$('input, select, textarea').bind('focus blur', function(event) {
MBP.viewportMeta.attr('content', 'width=device-width,initial-scale=1,maximum-scale=' + (event.type == 'blur' ? 10 : 1));
});
};
})(document);