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Question

我有一个通过URL上传图片的功能。我想更改文件名，下载文件：＆＃39; image.jpg＆＃39;。

这就是我的所作所为：

public downloadImageJpeg(instanceUID: string, format: string): string {
  var a = document.createElement("a");
  a.download = 'image.jpg';
  a.href = this.getRootUrl() + `/dicom/instances/${instanceUID}/wado/jpg`;

  var e = document.createEvent("MouseEvents");
  e.initMouseEvent("click", true, false, document.defaultView, 0, 0, 0, 0, 0, false, false, false, false, 0, null);
  a.dispatchEvent(e);
}

我的图片已上传，但其名称未更改，而且是＆＃39; jpg.jpg＆＃39;。你知道为什么它不是＆＃39; image.jpg＆＃39; ??

////////////// EDIT //////////////：

但是，我认为我的错误来自a.href。在一些例子中，我看到他被给了参数。我试过这个：

a.href =  "data:image/jpg;base64," + this.getRootUrl() + `/dicom/instances/${instanceUID}/wado/jpg`;

文件名更改但我没有下载，这让我发现网络故障 - 错误＆＃39;

Answer 1

以下功能正常：

export function download(url: string, filename: string) {
  var a = document.createElement('a');
  if (a.click) {
    // Use a.click() if available. Otherwise, Chrome might show
    // "Unsafe JavaScript attempt to initiate a navigation change
    //  for frame with URL" and not open the PDF at all.
    // Supported by (not mentioned = untested):
    // - Firefox 6 - 19 (4- does not support a.click, 5 ignores a.click)
    // - Chrome 19 - 26 (18- does not support a.click)
    // - Opera 9 - 12.15
    // - Internet Explorer 6 - 10
    // - Safari 6 (5.1- does not support a.click)
    a.href = url;
    a.target = '_parent';
    // Use a.download if available. This increases the likelihood that
    // the file is downloaded instead of opened by another PDF plugin.
    if ('download' in a) {
      a.download = filename;
    }
    // <a> must be in the document for IE and recent Firefox versions.
    // (otherwise .click() is ignored)
    (document.body || document.documentElement).appendChild(a);
    a.click();
    a.parentNode!.removeChild(a);
  } else {
    if (window.top === window &&
      url.split('#')[0] === window.location.href.split('#')[0]) {
      // If _parent == self, then opening an identical URL with different
      // location hash will only cause a navigation, not a download.
      var padCharacter = url.indexOf('?') === -1 ? '?' : '&';
      url = url.replace(/#|$/, padCharacter + '$&');
    }
    window.open(url, '_parent');
  }
}

来源

来自PDF查看器：https://github.com/mozilla/pdf.js/blob/94089960c04d7f59eb637d6dc63944115bbc539d/web/download_manager.js#L29-L63

更改下载的文件名

1 个答案:

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