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JavaScriptでPDFのファイルサイズを取得して表示させる方法

Last updated at Posted at 2021-02-28

実務で使う機会があったので、忘れないように投稿。

html
<a href="" class="js-pdfSize" target="_blank" data-filepath=""><p>PDFダウンロード<span class="file_size">0.0MB</span></p></a>
js
jQuery(function () {

jQuery.each(jQuery(".js-pdfSize"), function () {
  b(jQuery(this))
});

function b(d) {
  var h = "-";
  var g = d.data("filepath");
  if (!g) {
    d.find(".file_size").html(h);
    return
  }
  var e = g.split(".");
  if (e[e.length - 1].toLowerCase() !== "pdf") {
    d.find(".file_size").html(h);
    return
  }
  var f = $.ajax({
    type: "HEAD",
    url: g,
    dataType: "text"
  }).done(function () {
    var i = f.getResponseHeader("Content-Length");
    d.find(".file_size").html(c(i))
  }).fail(function () {
    d.find(".file_size").html(h)
  })
}

function c(d) {
  if (d < 1024) {
    return d + "B"
  } else {
    d = a(d)
  }
  if (d < 1024) {
    return d + "KB"
  } else {
    d = a(d)
  }
  if (d < 1024) {
    return d + "MB"
  } else {
    return a(d) + "GB"
  }
}

function a(d) {
  return (Math.ceil((d * 10) / 1024)) / 10
}
});

});

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