YUIはYahoo! UI Labraryだった

　前回簡単に使用できるといったことを多少後悔しつつ、なんとかサンプルを動かすことが出来ました。手軽さという面では他のJavaScriptライブラリには及ばないようです。
　しかし、YUIは大規模サイトで使用されている実績もあり、非常に動作が安定しています。また充実したUI部品と豊富な機能を備えています。

http://www.skillworker.net/test/YuiAnim1.html

１．まずアニメーションということで画像を一枚用意します。
　myPhotoというタグをつけましょう。YUIをいうかダイナミックHTMLは、このIDに対して操作を行います。

<img src="sample.jpg" width="300" height="455" id="myPhoto">

２．animモジュールの読み込み

YUI().use('anim', function(Y){～});

第2パラメータはモジュールの読み込み完了時に呼び出されるコールバック関数です。

３．コールバック関数の処理を追加
　どのエレメントにどのような動作を行わせるかを指定して、アニメーションオブジェクトを作成します。エレメントの指定はIDを指定します。今回はnode:'#myPhoto'です。
　どのように動作させるかは、from（開始値）とto（終了値）にそれぞれCSS(Cascading Style Sheets)のプロパティ名と値を指定します。まずopacityプロパティを使用して透明度を変化させて見ましょう。
　opacityプロパティは、要素の透過度を指定するプロパティです。0は完全透過で、1は完全不透過です。

new Y.Anim({ 　　node: '#myPhoto', 　　from : { opacity : 0.0 }, 　　to : { opacity : 1.0 } })

上記サンプルでは、myPhotoというIDに対して、opacityを0～1に変化させるというものです。

作成したアニメーションオブジェクトを動かすにはrun()メソッドを使用します。

function(Y){ 　　(new Y.Anim({ 　　　　node: '#myPhoto', 　　　　from : { opacity : 0.0 }, 　　　　to : { opacity : 1.0 } 　　})).run(); }

では、サンプルでテスト１ボタンを押してみて下さい。スクリプトの警告が表示された場合許可してください。

http://www.skillworker.net/test/YuiAnim1.html

では次にアニメーションの時間を指定してみましょう。
　duration は、変化が起きるとき、どれくらいの時間をかけて変化するのか、その時間を "秒数" で指定します。

YUI().use('anim', function(Y){ 　　(new Y.Anim({ 　　　　node: '#myPhoto', 　　　　duration : 5.0, 　　　　from : { opacity : 0.0 }, 　　　　to : { opacity : 1.0 } 　　})).run(); });

サンプルでテスト２ボタンを押してみて下さい。画像が5秒かけて浮かび上がってきましたね。

タグ：YUI Yahoo! UI Library アニメーション

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