April 2014
Intermediate to advanced
220 pages
4h 7m
Japanese
Content preview from AngularJSアプリケーション開発ガイド
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2.8
ディレクティブを使った
DOM
の更新
53
で、この仕組みはとても優れています。しかし、
input
以外の要素（
a
や
div
など）にフォーカスを
置きたい場合や、
HTML5
に非対応のブラウザではこの機能は利用できません。そこで役に立つの
がディレクティブです。
var appModule = angular.module("app", []);
appModule.directive("ngbkFocus", function() {
return {
link: function(scope, element, attrs, controller) {
element[0].focus();
}
};
});
このコードで返しているのはディレクティブの設定を表すオブジェクトであり、オブジェクトの
中には
link
という関数が含まれています。この
link
に引数として渡されるのは、コンテキストと
なるスコープとディレクティブが記述された要素、ディレクティブに渡された属性、そして（あれ
ば）要素に適用されるコントローラの
4
つです。ここでは、単に要素を選んで
focus()
を呼び出し
ているだけです。
定義したディレクティブは、
HTML
の中で以下のようにして利用します。
2.8.1
index.html
<html lang="en" ng-app="app">
...AngularJS
などのスクリプトをインクルードします
...
<body ng-controller="SomeController">
<button ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.