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<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>changePage JSON Sample</title>
<link rel="stylesheet" href="../../../css/themes/default/">
<script src="../../../js/jquery.js"></script>
<script src="../../../docs/_assets/js/jqm-docs.js"></script>
<script src="../../../js/jquery.mobile.js"></script>
<script type="text/javascript">
// Load the JSON data for a specific category, based on
// the URL passed in. Generate markup for the items in the
// category, inject it into an embedded page, and then make
// that page the current active page.
function showCategory( url, options )
{
$.getJSON( url, function( category ) {
if ( category ) {
// Get the page we are going to dump our content into.
var $page = $( "#category-items" ),
// Get the header for the page.
$header = $page.children( ":jqmData(role=header)" ),
// Get the content area element for the page.
$content = $page.children( ":jqmData(role=content)" ),
// The markup we are going to inject into the content
// area of the page.
markup = "<p>" + category.description + "</p><ul data-role='listview' data-inset='true'>",
// The array of items for this category.
cItems = category.items,
// The number of items in the category.
numItems = cItems.length;
// Generate a list item for each item in the category
// and add it to our markup.
for ( var i = 0; i < numItems; i++ ) {
markup += "<li>" + cItems[i].name + "</li>";
}
markup += "</ul>";
// Find the h1 element in our header and inject the name of
// the category into it.
$header.find( "h1" ).html( category.name );
// Inject the category items markup into the content element.
$content.html( markup );
// Pages are lazily enhanced. We call page() on the page
// element to make sure it is always enhanced before we
// attempt to enhance the listview markup we just injected.
// Subsequent calls to page() are ignored since a page/widget
// can only be enhanced once.
$page.page();
// Enhance the listview we just injected.
$content.find( ":jqmData(role=listview)" ).listview();
// We don't want the data-url of the page we just modified
// to be the url that shows up in the browser's location field,
// so set the dataUrl option to the URL for the category
// we just loaded.
options.dataUrl = url;
// Now call changePage() and tell it to switch to
// the page we just modified.
$.mobile.changePage( $page, options );
}
});
}
// Listen for any attempts to call changePage().
$(document).bind( "pagebeforechange", function( e, data ) {
// We only want to handle changePage() calls where the caller is
// asking us to load a page by URL.
if ( typeof data.toPage === "string" ) {
// We are being asked to load a page by URL, but we only
// want to handle URLs that request the data for a specific
// category.
var u = $.mobile.path.parseUrl( data.toPage );
if ( u.pathname.search("category.php") !== -1 ) {
// We're being asked to display the items for a specific category.
// Call our internal method that builds the content for the category
// on the fly based on our in-memory category data structure.
showCategory( u.href, data.options );
// Make sure to tell changePage() we've handled this call so it doesn't
// have to do anything.
e.preventDefault();
}
}
});
</script>
</head>
<body>
<div data-role="page">
<div data-role="header"><h1>Categories</h1></div>
<div data-role="content">
<h2>Select a Category Below:</h2>
<ul data-role="listview" data-inset="true">
<li><a href="category.php?id=animals">Animals</a></li>
<li><a href="category.php?id=colors">Colors</a></li>
<li><a href="category.php?id=vehicles">Vehicles</a></li>
</ul>
</div>
</div>
<div id="category-items" data-role="page" data-add-back-btn="true">
<div data-role="header"><h1></h1></div>
<div data-role="content"></div>
</div>
</body>
</html>
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