Guide on choosing the filename for downloads in Front-End applications

UPDATE:

Creating a Blob from a base64 string in JavaScript

I'm currently working on a feature where a user can click a button to download a file from its DataURL.

However, due to Chrome restrictions on building <a> links, I encountered an error message:

Not allowed to navigate top frame to data URL: ....

To workaround this issue, I discovered that opening a new window with an iframe and setting the DataURL as its src works:

let jpgWindow = window.open("", "_blank")
var html = "<html><body><iframe width='100%' height='100%' src='data:application/jpeg;base64, "+ theDataURL+"'></iframe></body></html>";
jpgWindow.document.write(html)

Although the download functionality works as intended when the button is clicked, the downloaded picture is saved with the filename "download" by default, without the option to specify a custom file name.

Any suggestions or ideas on how to overcome this issue?

javascript

Answer №1

Take a look at the method window.URL.createObjectURL by visiting https://developer.mozilla.org/en-US/docs/Web/API/URL/createObjectURL

const blob = new Blob(['array of data in your file'], {type : 'text/rtf'});
const anchor = document.createElement('a');

anchor.href = window.URL.createObjectURL(blob);
anchor.download = 'the-file-name.txt';
anchor.click();

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