how to make pinch/zoom work on an image
I am still learning the tricks to jQuery mobile and have been having a problem with the zooming in and zooming out of a picture/image on a data-role="page." Is there a way to make the pinch/zoom work on an image on the iPhone using jquery mobile? Cant get it to work on the iOS Simulator. Here is my code.
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>jQuery Mobile Web App</title>
<meta content="width=device-width, initial-scale=1, maximum-scale=2" name="viewport">
<link href="jquery.mobile-1.0a3.min.css" rel="stylesheet" type="text/css"/>
<script src="jquery-1.5.min.js" type="text/javascript"></script>
<script src="jquery.mobile-1.0a3.min.js" type="text/javascript"></script>
<!-- This reference to phonegap.js will allow for code hints as long as the current site has been configured as a mobile application.
To configure the site as a mobile application, go to Site -> Mobile Applications -> Configure Application Framework... -->
<script src="/phonegap.js" type="text/javascript"></script>
</head>
<body>
<div data-role="page" id="page">
<div data-role="header">
<h1>Page One</h1>
</div>
<div data-role="content" style="padding:0;">
<img src="coffee.gif" width="320" height="480" alt="coffee">
</div>
<div data-role="footer">
<h4>Page Footer</h4>
</div>
</div>
</body>
</html>
Thanks so much for your help. Much appreciated.
-bob
Answer
It's the viewport metadata property that controls those settings.
Follow this to see how to enable pinch & zoom on JQM iOS (shouldn't really matter that you are using PhoneGap).
Hope this helps.
When jQuery Mobile renders a page, it adds the following meta tag to the head of the document.
<meta content="width=device-width, minimum-scale=1, maximum-scale=1" name="viewport">
It is the minimum-scale=1, maximum-scale=1 part of the tag which disables the pinch zoom. What we need to do is modify the $.mobile.metaViewportContent variable. We can do this using the following code.
$(document).bind('mobileinit', function(){
$.mobile.metaViewportContent = 'width=device-width';
});
If we want to restrict the amount of zooming, we can use the following:
$(document).bind('mobileinit', function(){
$.mobile.metaViewportContent = 'width=device-width, minimum-scale=1, maximum-scale=2';
});