我正在使用 JQM 构建一个移动 Web 应用程序。这是非常基本的，首页显示链接项目列表。当用户单击链接时，JQM 会动态注入显示项目特定详细信息的页面。问题是，当用户单击链接时，我需要应用程序显示加载动画，而 JQM 通过 ajax 获取页面并显示它。这是代码：
// 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
// item.
var u = $.mobile.path.parseUrl( data.toPage ),
re = /^#item_/;
if ( u.hash.search(re) !== -1 ) {
// Show the loading message
$.mobile.showPageLoadingMsg();
// We're being asked to display the information for a specific item.
// Call our internal method that builds the content for the category
// on the fly based on our in-memory category data structure.
showPostDetails( u, data.options );
// Make sure to tell changePage() we've handled this call so it doesn't
// have to do anything.
e.preventDefault();
}
}
});
// Load the data for a specific item, based on
// the URL passed in. Generate markup for the items in the
// ajax call, inject it into an embedded page, and then make
// that page the current active page.
function showPostDetails( urlObj, options ) {
// Get the data string
var IDString = urlObj.hash.replace( /.*show_id=/, "" )
// Perform ajax to get the other page details
$.ajax({
type: 'POST',
dataType : 'json',
async: false,
url: template_url + '/bin/aj_ax.php',
data: 'post_id=' + IDString + '&ajax-action=get_post_details',
success: function( data ) {
// If we are successful
// Hide loading message
$.mobile.hidePageLoadingMsg();
if( data.success ) {
var $page = $( '#item_' ),
// 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)" ),
// Get the footer area element for the page.
$footer = $page.children( ":jqmData(role=footer)" ),
// The markup we are going to inject into the content
// area of the page.
markup = data.content;
// Find the h1 element in our header and inject the data
// header attribute to it.
$header.find( "h1" ).html( data.header );
// Inject the markup into the content element.
$content.html( markup );
// Inject the footer markup
$footer.html( data.footer );
// Pages are lazily enhanced. We call page() on the page
// element to make sure it is always enhanced before we
// attempt to enhance the markup we just injected.
// Subsequent calls to page() are ignored since a page/widget
// can only be enhanced once.
$page.page();
// 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 = urlObj.href;
// Now call changePage() and tell it to switch to
// the page we just modified.
$.mobile.changePage( $page, options );
// Refresh the page elements
$( "div[data-role=page]" ).page( "destroy" ).page();
}
}
});
}
奇怪的是，当我在 Win7 上使用 Firefox 时，加载消息显示得很好。但是，当我使用适用于 Windows 和 Android 的 Google Chrome、默认的 Android 浏览器和适用于 iOS 设备的 Safari 时，我什么也得不到。请让我知道我可能做错了什么。谢谢！
编辑：当我试图找出问题所在时，我意识到当我调用 $.mobile.changePage( $page, options ); 时加载动画消失了。那里有什么问题吗？