[英]How to make a loading animation for windows8 app
我有一個通過javascript,css和html制作的Windows8應用,它顯示rss feed。 有時,此Feed可能需要2到10秒鍾才能加載,這對我來說不是問題,但對於需要該應用的用戶來說,他們想知道其已加載且未凍結。 我有一個動畫加載動畫(GIF),但我不知道在rss加載動畫時如何顯示它。 有任何想法嗎? 謝謝你的時間。
這是主要的javascript,
(function () {
"use strict";
WinJS.Binding.optimizeBindingReferences = true;
var app = WinJS.Application;
var activation = Windows.ApplicationModel.Activation;
var articlesList;
app.onactivated = function (args) {
if (args.detail.kind === activation.ActivationKind.launch) {
if (args.detail.previousExecutionState !== activation.ApplicationExecutionState.terminated) {
// TODO: This application has been newly launched. Initialize
// your application here.
} else {
// TODO: This application has been reactivated from suspension.
// Restore application state here.
}
articlesList = new WinJS.Binding.List();
var publicMembers = { ItemList: articlesList };
WinJS.Namespace.define("C9Data", publicMembers);
args.setPromise(WinJS.UI.processAll().then(downloadC9BlogFeed));
}
};
function downloadC9BlogFeed() {
WinJS.xhr({ url: "http://channel9.msdn.com/coding4fun/articles/RSS" }).then(function (rss) { // this is where it is calling the RSS
var items = rss.responseXML.querySelectorAll("item");
for (var n = 0; n < items.length; n++) {
var article = {};
article.title = items[n].querySelector("title").textContent;
var thumbs = items[n].querySelectorAll("thumbnail");
if (thumbs.length > 1) {
article.thumbnail = thumbs[1].attributes.getNamedItem("url").textContent;
article.content = items[n].textContent;
articlesList.push(article);
}
}
});
}
app.oncheckpoint = function (args) {
// TODO: This application is about to be suspended. Save any state
// that needs to persist across suspensions here. You might use the
// WinJS.Application.sessionState object, which is automatically
// saved and restored across suspension. If you need to complete an
// asynchronous operation before your application is suspended, call
// args.setPromise().
};
app.start();
})();
@mleroy已經描述了正確的加載方式。 偽代碼(CoffeeScript):
downloadC9BlogFeed = () ->
listView.style.display = 'none'
placeholderAnimation.style.display = 'block'
WinJS.xhr(url)
.then (rss) ->
items = rss.responseXML.querySelectorAll("item")
items.forEach (item) ->
[process the item without having to use items[n] multiple times]
.then () ->
placeholderAnimation.style.display = 'none'
listView.style.display = 'block'
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