How to force Chrome to NOT open SaveAs Dialog when downloading a URL?
It is impossible when "Ask where to save each file before downloading" Enabled (as of 70.0.3538.77). The corresponding Chromium bug is:
Bug 417112: chrome.downloads.download ignore saveAs
Moreover setting filename in chrome.downloads.downloads() also doesn't work.
Edit : I've added complete sample code for multiple file downloads which doesn't show SaveAs Dialog.
You can achieve this by using chrome.downloads API.
manifest.json
{ "description": "Multiple file downloads without showing SaveAs Dialog", "background": { "scripts": [ "background.js" ], "persistent" : true }, "content_scripts": [{ "js": [ "content_script.js"], "matches": [ "<all_urls>" ], "run_at": "document_start" }], "manifest_version": 2, "name": "MultipleFileDownloads", "permissions": [ "downloads" ], "short_name": "MFD", "version": "0.0.0.1"}content_script.js
var DOWNLOAD_LIMIT = 100;function downloadURL(url, filename, callback){ chrome.runtime.sendMessage({ download_url : url, filename : filename },function(){ if(typeof callback == 'function'){ callback(); } })}function simulateFileDownload(i){ if(i > DOWNLOAD_LIMIT){ document.getElementById('download_btn').disabled = false; return false; } var blob = new Blob(['This is sample file '+i], {type:'text/plain'}); var url = URL.createObjectURL(blob); downloadURL(url,'Sample-'+i+'.txt',function(){ URL.revokeObjectURL(url); i++; simulateFileDownload(i); })}window.onload = function(){ var btn = document.createElement('button'); btn.id = 'download_btn'; btn.style.cssText = 'position:fixed;top:10px;left:10px;width:140px;height:30px;z-index:1000000;'; btn.textContent = 'Download Files'; document.body.appendChild(btn); btn.addEventListener('click',function(){ this.disabled = true; simulateFileDownload(0); })}background.js
chrome.runtime.onMessage.addListener(function(message, sender, sendResponse){ if(message.download_url){ chrome.downloads.download({ url : message.download_url, filename : message.filename, saveAs : false }) }});