Developing an android app in html5(phonegap) and I had to use a scrollView. Could find anything in html5 as we have in Java so I'm trying to use the library iScroll which served the purpose of scrolling but as I scroll down it bounces back to top, I suppose it is called rubber-band-effect. How do I handle this glitch? Plus as I scroll down by dragging I get a warning in Logcat:
W/webview(2795): Miss a drag as we are waiting for WebCore's response for touch down.
Check my following code in which the list items are getting dynamically added which should not be the issue, the problem IMO lies in html itself.
<!DOCTYPE html>
<html>
<head>
<title>Storage Example </title>
<link rel="stylesheet" type="text/css" href="indexCss.css" />
<style type="text/css" media="all">
body,ul,li {
padding:0;
margin:0;
border:0;
}
</style>
<script type="text/javascript" charset="utf-8" src="cordova-2.0.0.js"></script>
<script src="index.js" type="text/javascript" charset="utf-8" >
</script>
</head>
<body>
<header>
<input type="text" id="name" placeholder="enter name" />
<input type="button" value="Add" onclick='Add();' />
</header>
<div id="wrapper">
<div id="scroll-content">
<div id="result"></div>
</div>
</div>
<footer>
Some Footer Content
</footer>
<script type="text/javascript" src="iscroll.js"></script>
<script type="text/javascript">
var theScroll;
function scroll() {
theScroll = new iScroll('wrapper');
}
document.addEventListener('DOMContentLoaded', scroll, true);
</script>
</body>
</html>
I had this problem solved, removing the height:100%; property from my wrapper.
bottom:0; made sure the wrapper stretched all the way to the bottom of the screen.
Try this:
scroll = new iScroll(this, {
useTransform: false,
useTransition: true
});
If does not work, go through this:
https://groups.google.com/forum/#!topic/iscroll/CMB9d_e5d4Y
This problem occurs when you have a container div for your wrapper The fix for this is to set the height of the container to 99%.
Following is the CSS which finally fixed this issue for me:
#productsScreen{ /* my container */
height: 99%;
z-index: 1;
top: 0px;
left: 0;
overflow: auto;
}
#productListWrapper{
background:transparent;
position:absolute;
z-index:1;
top: 88px;
bottom:49px;
left:0;
width:100%;
overflow:auto;
}
#productsListScroller {
position:absolute; z-index:1;
-webkit-tap-highlight-color:rgba(0,0,0,0);
width:100%;
padding:0;
-webkit-box-sizing: border-box;
-moz-box-sizing: border-box;
-o-box-sizing: border-box;
box-sizing: border-box;
}
Hope that helps!
Had the same issue and after sweet midnight debugging fount that my wrapper was resizing for some reason to height way bigger than the phone screen. Im using jquery mobile paging and somehow it was messing with the iScroll. Here is how i solved it:
HTML
<div id="screen" data-role="page">
<div data-role="content">
<div id="list-wrapper">
<ul>
...
</ul>
</div>
</div>
<div data-role="footer">
...
</div>
</div>
JS
// the iScroll should be initialized after the page is visible
// to prevent bug with display:none. If you are not using
// jQuery mobile paging this can be skipped.
$('#screen').on('pageshow', function() {
// calculate the expected height of the real content wrapper and set it
var screenHeight = $('#screen').height();
var footerHeight = $('#screen [data-role="footer"]').height();
var realContentHeight = screenHeight - footerHeight;
$('#list-wrapper').css({'height': realContentHeight + 'px'});
// create or refresh the iScroll after resizing the wrapper
if (myScrollFunction != null ) {
setTimeout(function () {
myScrollFunction .refresh();
}, 100);
} else {
setTimeout(function () {
myScrollFunction = new iScroll('list-wrapper');
}, 100);
}
});
Related
I've noticed a strange behavior on a CSS animation, when I viewed my webpage on an Android device.
When I scroll up and down a few timer while the animation is running, the whole page starts to flicker. It's reproducable (even tough a bit finicky).
This YouTube-video shows the effect:
https://www.youtube.com/watch?v=tOVEDxiHQ-k&t=10s
I removed more and more code from my page until I found the culpit. It's the "#keyframes"-part of the animation. If I'd leave this part out, everything works fine, but as I want the animation: What's the real problem here?
Here is a minimal version of my source code that reproduces the problem:
<!DOCTYPE html>
<html lang="en" class="bg-gray-700">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Just a simple page</title>
<script src="https://cdn.tailwindcss.com"></script>
<style>
.progressbar {
animation: progressbar-countdown;
animation-duration: 60s;
animation-iteration-count: 1;
animation-fill-mode: forwards;
animation-play-state: running;
animation-timing-function: linear;
-webkit-animation-fill-mode: forwards;
}
#keyframes progressbar-countdown {
0% {
width: 100%;
background: #4F4;
}
100% {
width: 0;
background: #F00;
}
}
</style>
</head>
<body class="font-sans antialiased overflow-y-scroll">
<header class="bg-gray-900">
<div class="max-w-7xl mx-auto py-2 sm:py-4 px-4 sm:px-6 lg:px-8 h-12">
<h2 class="text-white">Test</h2>
</div>
</header>
<div class="relative" id="countdownBar">
<div class="h-2 mb-4 text-xs bg-indigo-100">
<div class="progressbar shadow-none h-2 whitespace-nowrap text-white justify-center bg-primary-500" id='progressbar3'></div>
</div>
</div>
<main>
<h1 class="mt-4 text-white">This is a Test</h1>
<div style="height: 750px;">
Scrolling
</div>
</main>
</body>
</html>
Hi I am developing a native android application in phone-gap ,in that application I want to upload a image file through chose file button when I click the button I want to open the device gallery but the gallery window is not opening.I can open the gallery windows when I load through browser in device but cant make it natively for android,so please help me find solution for this.
Will the phone gap scripting file changes for various platform or it needs any plugin files to be added for various platforms in phone gap or I need to add any cordova.js files to root files(like WWW).
I have doubt that any kind of version compatibility issues in phone gap or device so please help me.
for further details i will add my code below.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="viewport" content="initial-scale=1.0, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0" />
<link rel="stylesheet" type="text/css" href="css/style.css" />
<link rel="stylesheet" type="text/css" href="js/jquery/plugins/jqtransform/jqtransform.css" />
<title> Mobile</title>
<script src="js/jquery/jquery162min.js" type="text/javascript"></script>
<script src="js/jquery/plugins/accordion/jqueryui1814custommin.js" type="text/javascript"></script>
<script type="text/javascript" src="js/jquery/plugins/jqtransform/jqtransform.js" ></script>
<script src="js/mgeneral.js" type="text/javascript"></script>
<script src="../js/pl/plupload.js" type="text/javascript"></script>
<script src="../js/pl/plupload.html5.js" type="text/javascript"></script>
<script type="text/javascript" language="javascript">
$(document).ready(function () {
/*Set skin for select, options and checkbox*/
$('.skinnable').jqTransform({ imgPath: 'img/' });
$('#apply-to-selection-2').click(function (e) {
e.preventDefault();
Logout();
if (RTNCODE)
window.location = "index.html";
});
/*table row select*/
$("table.grid thead tr th.col-row-select input").click(function () {
if (!$(this).is(":checked")) {
$("table.grid tbody tr td.col-row-select input").each(function () {
$(this).attr("checked", true);
$(this).change();
});
}
else {
$("table.grid tbody tr td.col-row-select input").each(function () {
$(this).attr("checked", false);
$(this).change();
});
}
});
/*END table row select*/
/*Create accordion*/
$(".accordion").accordion({
header: ".accordion-tab",
collapsible: true,
active: 0,
autoHeight: false
});
});
</script>
<script type="text/javascript">
$(function () { //image loader
var uploaderimage = new plupload.Uploader({
// General settings
runtimes: 'html5',
container: 'imagecontainer',
browse_button: 'pickfiles',
url: '/imageupload.ashx?mobile=true',
multi_selection: false,
max_file_size: '10mb',
//chunk_size: '1mb',
multipart: true,
urlstream_upload: true,
// Specify what files to browse for
filters: [
{ title: "Image files", extensions: "jpg,gif,png" }
]
});
uploaderimage.init();
uploaderimage.bind('FilesAdded', function (up, files) {
// showmodalmask();
uploaderimage.start();
$('.imgpre').show();
$('.imgcpl').hide();
});
uploaderimage.bind('FileUploaded', function (up, file) {
if (uploaderimage.total.uploaded == uploaderimage.files.length) {
// $('.btnrefresh').click();
$('.imgcpl').show();
$('.imgpre').hide();
}
});
});
</script>
</head>
<body>
<div class="container">
<div class="frame">
<div class="frame-border-top"></div>
<div class="frame-border-middle">
<div class="cute" style="">
<h1 class="header" style="color:transparent; width:270px; height:20px;">
</h1></div>
<!-- MENU START XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX -->
<div id="tabs-2" style="background-color:Black; border:1px solid #363636;">
<div style="margin-left:-15px; margin-top:-6px;">
<div class="form-row padding-lr-5" style="text-align:center;">
<div id="imagecontainer" >
<div id="filelist"></div>
<br />
<a id="pickfiles" href="#" style="background-color: #447cd1; color: white; border: 2px solid #113b7c; border-radius: 12px; padding: 6px 10px; font-size: 12pt; text-decoration: none">Select file</a>
</div>
<br />
<div class="holderloderp imgpre" style="display:none"><img src="../images/pnl-preloader2.gif" width="25" height="25" alt="" class="pnl-preloader2" /></div>
<div class="imgcpl" style="color: green; display: none" >Complete</div>
</div>
<div class="clear" style="height:25px;"></div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
You need to use the FileTransfer object of the phonegap API which will do the upload to your server using any server side script file handler.
Look at this link
I have a PhoneGap application that uses JQuery mobile to navigate between pages.
When I navigate from the main page to a page containing a Google map, the map shows only a single tile at a time in the top left corner like this:
What can be the reason for this ?
**
Source Code:
The following script is in the head of my page
<script>
$(document).on("pageinit", "#stores", function () {
var centerLocation = new google.maps.LatLng('57.77828', '14.17200');
var myOptions = {
center: centerLocation,
zoom: 8,
mapTypeId: google.maps.MapTypeId.ROADMAP,
callback: function () { alert('callback'); }
};
map_element = document.getElementById("map_canvas");
map = new google.maps.Map(map_element, myOptions);
var mapwidth = $(window).width();
var mapheight = $(window).height();
$("#map_canvas").height(mapheight);
$("#map_canvas").width(mapwidth);
google.maps.event.trigger(map, 'resize');
});
</script>
My Page is like this
<!-- Home -->
<div data-role="page" id="home">
.
.
.
</div>
<div data-role="page" id="stores">
<div data-role="content" id="map_canvas"></div>
</div>
I navigate from home to the maps page like this:
Stores
Update
after applying Gajotres solution the tiles become like this
intro
Newer versions of jQuery Mobile and Google Maps v3 are a little bit special.
Your first problem was using pageinit event to the the calculation. At that point you cant get a correct page height and width. So instead use pageshow, you will find it working in my example.
Before you show the map you need to resize its content DIV. This is because content div will resize according to available inner elements. So we need to fix this manually, through javascript or CSS. I already have a answer on that question: google map not full screen after upgrade to jquerymobile 1.2 but I can also show you a working example:
Working example
Working jsFiddle example: http://jsfiddle.net/Gajotres/GHZc8/ (Javascript solution, CSS solution can be found in a bottom link).
Code
HTML
<!DOCTYPE html>
<html>
<head>
<title>jQM Complex Demo</title>
<meta name="viewport" content="initial-scale=1, maximum-scale=1"/>
<link rel="stylesheet" href="http://code.jquery.com/mobile/1.2.0/jquery.mobile-1.2.0.min.css" />
<script type="text/javascript" src="http://maps.google.com/maps/api/js?sensor=true"></script>
<script src="http://code.jquery.com/mobile/1.2.0/jquery.mobile-1.2.0.min.js"></script>
</head>
<body>
<div data-role="page" id="index">
<div data-theme="a" data-role="header">
<h3>
First Page
</h3>
</div>
<div data-role="content" id="content">
<div id="map_canvas" style="height:100%"></div>
</div>
<div data-theme="a" data-role="footer" data-position="fixed">
<h3>
First Page
</h3>
</div>
</div>
</body>
</html>
Javascript
Here's a function used to calculate correct page height:
$('#map_canvas').css('height',getRealContentHeight());
function getRealContentHeight() {
var header = $.mobile.activePage.find("div[data-role='header']:visible");
var footer = $.mobile.activePage.find("div[data-role='footer']:visible");
var content = $.mobile.activePage.find("div[data-role='content']:visible:visible");
var viewport_height = $(window).height();
var content_height = viewport_height - header.outerHeight() - footer.outerHeight();
if((content.outerHeight() - header.outerHeight() - footer.outerHeight()) <= viewport_height) {
content_height -= (content.outerHeight() - content.height());
}
return content_height;
}
Another solution
There's also another solution to this problem that only uses CSS and it can be found HERE. I prefer this solution cause it don't require javascript to correctly fix the map height.
CSS:
#content {
padding: 0;
position : absolute !important;
top : 40px !important;
right : 0;
bottom : 40px !important;
left : 0 !important;
}
One last thing
Also if page width is still incorrect just set it to 100%:
$('#map_canvas').css('width', '100%');
I have had this issue for months banging my head against the wall trying to find a solution. Even setting the style properties for the content and map-canavas divs did not solve all the problems. google.maps.event.trigger(map, "resize") did not do it either. The map was full screen now but still centered in the top left. And if you called your initialize functions on every pageshow the map would reset back to its original position each time.
I was able to come up with this called on the pageshow event and solved all my problems!
$('map-page').on("pageshow", function() {
var latLng = map.getCenter();
google.maps.event.trigger(map,'resize');
map.setCenter(latLng);
});
CSS
<style>
html, body, #map-canvas {
height: 100%;
margin: 0px;
padding: 0px
}
.ui-page { -webkit-backface-visibility: hidden; }
</style>
Here is my content and map-canvas div.
<div data-role="content" id="mapContent" style="padding:0;position:absolute;
top:40px;right:0px;bottom:60px;left:0px; ">
<div id="map-canvas" style="width:100%;" >
</div>
</div><!-- /Content -->
It gets the current center of the map, resizes the map to the current div, then sets the map center. This way, if the user navigates away from the page and comes back, the map does not lose its position.
Hope this helps.
Robert
I have created the project having Listview with default theme. My configuration goes as explained below.
index.html file where all the imports to css, js files are done including cordova-2.0.0.js and other stuffs that are needed. Index.html file contains my Login Page.
Now, After login I go to home.html page where i have list view configured as below :
<div data-role="header" data-theme="b">
<h1>Home Screen</h1>
</div>
<div data-role="content">
<ul data-role="listview" data-theme="c">
<li><img src="images/profile.png" alt="Profile">My Profile</li>
<li><img src="images/courses.jpg" width="189" height="189" alt="Courses">My Courses</li>
<li><img src="images/contact.jpg" width="160" height="160" alt="Contacts">My Contacts</li>
<li><img src="images/map.png" width="215" height="215" alt="Map">My Map</li>
</ul>
</div>
<div data-role="footer" data-theme="b">
<h4>© 2012.</h4>
</div>
Note that I have not included the header file here. and only this much code is there in home.html file. (Note here since it is HTML i am not able show my Parent div tag where i have configured data-role="page")
Now, all the themes are getting applied only the arrow is not coming instead a Gray Spot is coming as in below Pic.
Can any one explain why it goes like this?? I have checked the other project and I have all the imports as it is.
Below is my index.html imports :
<link rel="stylesheet" href="styles/custom.css" />
<link rel="stylesheet" href="styles/jquery.mobile-1.2.0.min.css" />
<script src="js/jquery-1.8.3.min.js"></script>
<!-- <script src="js/jquery-mobile-1.2.0.min.js"></script> -->
<script type="text/javascript" charset="utf-8" src="js/main.js"></script>
<script type="text/javascript" src="http://maps.google.com/maps/api/js?sensor=false"></script>
<script type="text/javascript" charset="utf-8" src="js/cordova-2.0.0.js"></script>
EDIT
my CSS custom.css goes as below
/* CSS Document */
#container0 {
width: 100%;
height: 100%;
position: relative;
overflow-x:hidden;
border: 1px solid black;
}
#div0 {
width: 100%;
height: 100%;
position: absolute;
}
#div1 {
width: 100%;
position: absolute;
left: 100%;
height: 100%;
}
/*#footer {
margin-top:'10px';
}*/
button {
display:block;
text-align:center;
margin:0 auto;
width:100%;
height:2em;
}
.loginBtn {
width:100%;
}
.info {
border:1px solid black;
background:#eeeeff;
margin:5px;
padding:5px;
}
/* Map CSS Start */
html, body {
height: 100%;
margin: 0;
padding: 0;
}
#map_canvas {
width:520px;
height: 900px;
}
/*#media print {*/
#media all and (orientation: landscape) {
html, body {
height: auto;
}
#map_canvas {
width: 950px;
height: 480px;
}
}
/* Map CSS End */
.ui-content h2 {
text-align:left;
padding:0px;
padding-left:10px;
margin-bottom:10px;
}
.ui-content h4 {
padding: 0px;
padding-left:10px;
margin-bottom: 5px;
}
Use above jquery files on proper places and try this after anchor tag
<span class="ui-icon ui-icon-arrow-r ui-icon-shadow"> </span>
Try with this:
<link rel="stylesheet" href="custom.css" />
<link rel="stylesheet" href="http://code.jquery.com/mobile/1.2.0/jquery.mobile-1.2.0.min.css" />
<script src="http://code.jquery.com/jquery-1.8.2.min.js"></script>
<script src="http://code.jquery.com/mobile/1.2.0/jquery.mobile-1.2.0.min.js"></script>
<script type="text/javascript" src="http://maps.google.com/maps/api/js?sensor=false"></script>
<script type="text/javascript" charset="utf-8" src="cordova-2.2.0.js"></script>
EDIT :
I got it solved for local jquery.mobile-1.2.0.min.css file.
First copy this image from this link Arrow Icon
You will get image named icons-18-white.png.
Save this image into www/images/icons-18-white.png path.
That's it.
It works for me.
Thanks.
I'm using JQuery 1.1.0 and Phonegap 1.9.0 to develop a html5 App for Android. I have a little animation which draws a battery on the canvas and updates it. It looks like a battery, which is loading. It worked very well on android 4.0.4.
Yesterday I received the update to Android 4.1.1 on my Galaxy Nexus. After that change I had issues with my animation. Now it draws to images on the canvas, one is in front and the other is behind with wrong coordinates. I think it has something to do with the Changes to Java Script Engine V8, maybe caching issues?! On every browser on my PC the animation works very well.
My html code is:
<!DOCTYPE html>
<html>
<head>
<title>Hella App</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="jquery.mobile-1.1.1.min.css"/>
<script src="jquery-1.7.2.min.js"></script>
<script src="jquery.mobile-1.1.1.min.js"></script>
<script type="text/javascript" charset="utf-8" src="cordova-1.9.0.js"></script>
<style>
.ui-page { background: black;}
</style>
</head>
<body>
<div data-role="page" id="dataPageBattery" data-theme="a">
<h2 align="center">Battery State</h2>
<div data-role="header" data-position="fixed" data-theme="a">
<h1>Car Data</h1>
</div>
<div data-role="content" align="center">
<canvas id="myBatteryCanvas" width="device-width"
height="device-height">
Sorry, your browser doesn't support canvas technology
</canvas>
</div>
<h4 align="center" id="batteryProzent"></h4>
<script type="text/javascript" src="battery.js"></script>
<script>$(document).on("pageshow",init());</script>
<div data-role="footer" data-position="fixed" data-id="persFooter">
<div data-role="navbar">
<ul>
<li>Connect</li>
<li>Cars</li>
<li>Info</li>
</ul>
</div>
</div>
<script>
$('#dataPageBattery').on('swipeleft',function(){
$.mobile.changePage("geolocation.html", { transition: "slide"});
console.log('slideLeft');
})
$('#dataPageBattery').on('swiperight',function(){
$.mobile.changePage("fuelGauge.html", { transition: "slide", reverse: 'true'});
console.log('slideLeft');
})
</script>
</div>
</body>
</html>
My java script code, which I'm loading:
var canvas = document.getElementById("myBatteryCanvas");
var ctx = canvas.getContext("2d");
var x = 50;
var y = canvas.height - 30;
var mx = 2;
var my = 1;
var WIDTH = canvas.width;
var HEIGHT = canvas.height;
var prozent = 1;
function drawRect(y, farbe) {
ctx.beginPath();
ctx.rect(124, y, 50, 21);
ctx.fillStyle = farbe;
ctx.fill();
window.setTimeout("draw()", 10);
}
function draw() {
if (y >= 80) {
y -= my;
window.setTimeout("drawRect(y,'red')", 10);
} else if (y >= 50) {
y -= my;
window.setTimeout("drawRect(y,'orange')", 10);
ctx.rect(124, 50 + 50, 50, 40);
ctx.fillStyle = 'orange';
ctx.fill();
} else {
ctx.rect(124, 50, 50, canvas.height - 60);
ctx.fillStyle = 'lightgreen';
ctx.fill();
}
document.getElementById('batteryProzent').innerHTML = '> ' + prozent + ' %';
prozent++;
if (prozent % 4 == 0)
prozent++;
}
function init() {
ctx.rect(122, 40, 54, 100);
ctx.fillStyle = 'floralwhite';
ctx.fill();
ctx.lineWidth = 4;
ctx.strokeStyle = '#303030';
ctx.stroke();
draw();
}
Another nice issue: If I use this html page as the first page to start with inside the Phonegap code, there is no problem. But if I use it inside the whole App, I'm facing the problems.
For this reason, I post my first page too:
<!DOCTYPE html>
<html>
<head>
<title> BLE App</title>
<script type="text/javascript" charset="utf-8" src="cordova-1.9.0.js"></script>
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta name="apple-mobile-web-app-capable" content="yes">
<link rel="apple-touch-icon" href="Logo.png" />
<link rel="stylesheet" href="jquery.mobile-1.1.0.min.css"/>
<script src="jquery-1.7.1.min.js"></script>
<script src="jquery.mobile-1.1.0.min.js"></script>
<script src="http://maps.google.com/maps/api/js?sensor=true"></script>
<style>
.ui-page { background: black;}
</style>
</head>
<body>
<div data-role="page" id="mainPage" data-theme="a">
<div data-role="header" data-position="fixed" data-theme="a">
<h1> BLE</h1>
</div><!-- /header -->
<div data-role="content">
<!-- <p> BLE Test App</p> -->
<label for="mainPage_textFrage">Find BLE Devices:</label>
<!-- <input type="text" id="mainPage_textFrage" value="" placeholder="Ihre Frage"/> -->
<a data-role=button id="mainPage_showAnswerButton">Search</a>
</div><!-- /content -->
<div data-role="footer" data-position="fixed" data-id="persFooter">
<div data-role="navbar">
<ul>
<li>Connect</li>
<li>Cars</li>
<li>Info</li>
</ul>
</div><!-- /navbar -->
</div><!-- /footer -->
</div>
<script>
$('#mainPage_showAnswerButton').on('click',function(){
$.mobile.changePage("searchResult.html", { transition: "slideup"});
console.log('click');
})
</script>
</body>
</html>
Is there somebody with same issues? Can somebody help?
Thanks so far!
UPDATE:
I updated JQuery to 1.7.2 and JQuery Mobile to 1.1.1. But still there is no change. The animation isn't working.
Possible solution:
Removing the following line from jquery-mobile-css eliminates the problem:
/*content area*/
.ui-content { border-width: 0; overflow: visible; overflow-x: hidden; padding: 15px; }
(removing "overflow-x: hidden" is sufficient).
A better solution is to override the "overflow-x" attribute on the surrounding div-element (not the canvas-element itself).
Example (for battery-status):
<div data-role="content" align="center" data-theme="a" style="overflow-x: visible">
<canvas id="myBatteryCanvas" width="device-width" height="device-height">
Sorry, your browser doesn't support canvas technology
</canvas>
</div>
See also http://code.google.com/p/android/issues/detail?id=35474
When things go wrong when you transition from one page to another but not when you load the page itself standalone, it sounds like you need to (un)load stuff during the page transitions. jQuery Mobile loads anything inside <div data-role="page">...</div> on a page transition. That also means that anything outside these divs is ignored. Not only that, but the javascript code from the previous page still continues on to the next.
I see the two blocks of <script>...</script> at the bottom of the 2 HTML pages and only one of those will load, namely the one on the page that you refresh at. Make sure these scripts are loaded by inserting the the scripts inside the data-role="page divs
You should change the following
<script>$(document).ready(window.setTimeout("init()", 500));</script>
to
<script>$(document).on("pageshow",window.setTimeout("init()", 500));</script>
per the jQM documentation you shouldn't use $(document).ready(...)
We are having the same issue here with our phone running Android 4.1.1. We have an html5 canvas application that displays a slider. The image of the slider is displayed 2 times. On our android 4.1, 4.0, 2.3 devices it displays fine. I don't think you can workaround this defect with a simple java script change. It is simply broken in the latest Jellybean patch.
We've used Nexus S and Galaxy Nexus phones with multiple different versions of android to prove this out (it's not phone specific).