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次のセクションは、スプレッドシートの変更をデータベースに保存する手順について説明します。
「スプレッドシートに加えられた変更の格納」のトピックで作成したサンプルに、以下の手順を追加します。
SpreadJSにはデータベースを直接更新する機能はありませんが、以下の方法で、変更されたデータを取得することができるので、変更されたデータをもとに、データベースの更新処理を適宜実装してください。
saveToDB 関数を作成し、 getDirtyCells メソッドを使用して、ダーティセル情報と呼ばれる変更されたセルの情報を取得します。
JSON.stringifyメソッドを使用して、ダーティセル情報をJSON文字列に変換します。
//1: saveToDB()を作成します。
function saveToDB() {
// DOM要素「ss」からactivesheetを取得します。
var ss = GC.Spread.Sheets.findControl(document.getElementById("ss"));
var sheet = ss.getActiveSheet();
// ダーティセル情報をダーティセル変数に格納します。
var dirtyCells = sheet.getDirtyCells();
// HTMLの<div>要素「msg」をidで取得します。これは手順2で作成されます。
var div = document.getElementById("msg");
// div要素にJSON文字列を表示して、変更されたセル情報を視覚化します。
div.innerHTML = JSON.stringify(dirtyCells, null, 4);
// メモ:データベースに変更を投稿します。
}
SpreadJS<div>要素の後に msg idを持つHTML<div>要素を作成して、JSON文字列を表示します。
saveToDB 関数が呼び出される「 DBに保存 」入力ボタンを作成します。キャプチャされてJSON文字列に変換された変更は、 [DBに保存] ボタンをクリックすると、id msg で<div>に表示されます。
すべてのボタンと<div>要素を含む新しいHTML<body>は次のように表示します。
<body>
<h1>スプレッドシートに加えられた変更をデータベースに保存します</h1>
<p>
このセクションでは、[DBに保存]ボタンとDIVを作成して、
[DBに保存]ボタンをクリックしたときに変更をJSON文字列として表示します。
</p>
<!-- 更新ボタンを作成します。 -->
<input type="button" value="更新" onclick="refresh()" />
<!-- [DBに保存] <div>とボタンを作成します。 -->
<input type="button" value="DBに保存" onclick="saveToDB()" />
<br />
<br />
<div id="ss" style="height:400px;width:900px"></div>
<!-- <div>を変更します。 -->
<div class="options-container">
<h4> データベースに保存された変更: </h4>
<div id="msg" style="width: 100%; height: 260px; border: 1px solid grey;"></div>
</div>
</body>
変更を含み、データベースに投稿されるJSON文字列は、次のように表示されます。