Save file from anchor tag using Electron

In script you can use the save file dialog by using the dialog module:

var fs = require('fs');
var dialog = require('dialog');
dialog.showSaveDialog(options, function (filePath) {
    fs.writeFile(filePath, pdfContents, function (err) {
        if(err) console.error(err);
    });
});

Here is the documentation:

https://github.com/atom/electron/blob/master/docs/api/dialog.md#dialogshowsavedialogbrowserwindow-options-callback

What I'm doing is two-fold.

mainWindow.webContents.on('new-window', function(event, url) {
    event.preventDefault();
    console.log("Handing off to O/S: "+url);
    shell.openExternal(url);
});

That is there so that whenever a page in my app wants to open a new window, that'll happen in an actual browser. This is also good for opening PDFs and such.

Then I just make sure that any download links use target=_blank or window.open() and the download will happen in the user's browser.