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axiosでファイルダウンロード処理を実装(IEにも対応)

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ダウンロードの仕組みはブラウザにて実装状況が異なるようです。

File APIを使ったダウンロードの仕組みが有名ですが、
IEではwindow.URL.createObjectURL()を使用するとおかしくなるみたいです。

File APIのブラウザによる差を吸収してくれるfileSaverというライブラリがあるため、
そちらを使用するとIEでも問題なくダウンロードできるようになります。

fileSaver - GitHub

ダウンロード処理の例

import { saveAs } from "file-saver";
import axios from "axios";

function download(params = {}){
    axios.get(apiUrl, {
              params,
              responseType: "blob"
            })
            .then(response => {
              const blob = new Blob([response.data], {
                type: response.data.type
              });

              //レスポンスヘッダからファイル名を取得します
              const contentDisposition = response.headers["content-disposition"];
              const fileName = getFileName(contentDisposition)

              //ダウンロードします
              saveAs(blob, fileName);
    })
}

function getFileName(contentDisposition){
    let fileName = contentDisposition.substring(contentDisposition.indexOf("''") + 2,
                                                contentDisposition.length
                                                );
    //デコードするとスペースが"+"になるのでスペースへ置換します
    fileName = decodeURI(fileName).replace(/\+/g, " ");

    return fileName;
}
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