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DataTransferItem.getAsFile() - Web API | MDN
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DataTransferItem.getAsFile()
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since 2016年11月.
アイテムがファイルの場合、 DataTransferItem.getAsFile()
メソッドはドラッグデータ項目の File
オブジェクトを返します。項目がファイルでない場合、このメソッドは null
を返します。
構文
js
getAsFile()
引数
なし。
返値
例
この例が、 getAsFile()
メソッドを drop
イベントハンドラー内で使用するものです。
js
function drop_handler(ev) {
console.log("Drop");
ev.preventDefault();
const data = ev.dataTransfer.items;
for (let i = 0; i < data.length; i += 1) {
if (data[i].kind === "string" && data[i].type.match("^text/plain")) {
// This item is the target node
data[i].getAsString((s) => {
ev.target.appendChild(document.getElementById(s));
});
} else if (data[i].kind === "string" && data[i].type.match("^text/html")) {
// Drag data item is HTML
console.log("… Drop: HTML");
} else if (
data[i].kind === "string" &&
data[i].type.match("^text/uri-list")
) {
// Drag data item is URI
console.log("… Drop: URI");
} else if (data[i].kind === "file" && data[i].type.match("^image/")) {
// Drag data item is an image file
const f = data[i].getAsFile();
console.log("… Drop: File ");
}
}
}
仕様書
Specification |
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HTML> # dom-datatransferitem-getasfile-dev> |
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