[英]How to force Chrome to NOT open SaveAs Dialog when downloading a URL?
Chrome Build: the newest, 33+ Chrome版本:最新的33+
A Chrome Extension extracts certain urls from currently viewed site and then downloads a subset of them (quite often hundreds of files). Chrome扩展程序从当前查看的网站中提取某些网址,然后下载其中的一部分(通常为数百个文件)。
Expected Behavior: 预期行为:
Files are downloaded into the default Download-Folder without questioning where and under which filename they have to be saved. 文件被下载到默认的“下载文件夹”中, 而无需询问文件的保存位置和文件名。
Problem: 问题:
If a user has enabled the option "Ask where to save each file before downloading" in Chrome->Settings->Advanced Settings->Downloads then when trying to download, for example, 100 files simultaniously, Chrome tries to open 100 SaveAs Dialogs and crashes. 如果用户在Chrome->设置->高级设置->下载中启用了“在下载前先询问保存每个文件的位置”选项,则在尝试同时下载(例如100个文件)时,Chrome尝试打开100个“另存为”对话框,然后崩溃。
What I tried: 我试过的
using the following code to trigger a download through an emulated mousevent: 使用以下代码通过模拟的mousevent触发下载:
function saveAs(Url,filename){ var blob=new Blob([''], {type:'application/octet-stream'}); var url = webkitURL.createObjectURL(blob); var a = document.createElementNS('http://www.w3.org/1999/xhtml','a'); a.href = Url; a.download = filename; var e = document.createEvent('MouseEvents'); e.initMouseEvent('click', false, false, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null); a.dispatchEvent(e); webkitURL.revokeObjectURL(url); }
Edit : I've added complete sample code for multiple file downloads which doesn't show SaveAs Dialog. 编辑 :我为多个文件下载添加了完整的示例代码,其中没有显示“另存为”对话框。
You can achieve this by using chrome.downloads API . 您可以使用chrome.downloads API来实现。
manifest.json 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 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 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
}
}
});
It is impossible when "Ask where to save each file before downloading" Enabled (as of 70.0.3538.77). 启用“在下载之前询问每个文件的保存位置”时(从70.0.3538.77开始)。 The corresponding Chromium bug is:
相应的Chromium错误是:
Bug 417112: chrome.downloads.download ignore saveAs 错误417112:chrome.downloads.download忽略saveAs
Moreover setting filename in chrome.downloads.downloads()
also doesn't work. 此外,在
chrome.downloads.downloads()
设置文件名也不起作用。
Bug 758094: Extension can not rename downloaded file 错误758094:扩展名无法重命名下载的文件
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