How Can I Force a Specific Filename When Downloading a Blob File in JavaScript?-JS Tutorial-php.cn

How Can I Force a Specific Filename When Downloading a Blob File in JavaScript?

Susan Sarandon

Release： 2024-12-14 08:00:19

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How Can I Force a Specific Filename When Downloading a Blob File in JavaScript?

Setting Blob File Name for Forced Downloads in JavaScript

When downloading a blob file directly through window.location, the default filename is a random string. However, you may want to set a custom filename to make it more informative.

To achieve this, you can't rely solely on the window.location method. Instead, you'll need to use the following steps:

Create a hidden element.

Set its href attribute to the blob's URL.

Set its download attribute to the desired filename.

Trigger a click on the element.

Here's an example that simplifies the process:

const saveData = (function () {
  const a = document.createElement("a");
  document.body.appendChild(a);
  a.style = "display: none";
  return (data, fileName) => {
    const json = JSON.stringify(data);
    const blob = new Blob([json], { type: "octet/stream" });
    const url = window.URL.createObjectURL(blob);
    a.href = url;
    a.download = fileName;
    a.click();
    window.URL.revokeObjectURL(url);
  };
})();

const data = { x: 42, s: "hello, world", d: new Date() };
const fileName = "my-download.json";

saveData(data, fileName);

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Notes:

Older browsers may not support the download attribute.
Certain file formats may be restricted by the browser, causing download failures. Consider using a different file extension (.txt for JSON, for example).

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