I am not sure if this is possible using standard web technologies.
I want the user to be able to download multiple files in a single action. That is click check boxes next to the files, and then get all the files that were checked.
Is it possible - if so what basic strategy do you recommend. I know I can use comets technology to create server side events that trigger an HttpResponse but I am hoping there is a simpler way.
HTTP does not support more than one file download at once.
There are two solutions:
{var%20f='http://v.t.sina.com.cn/share/share.php?appkey=1515056452',u=z||d.location,p=['&url=',e(u),'&title=',e(t||d.title),'&source=',e(r),'&sourceUrl=',e(l),'&content=',c||'gb2312','&pic=',e(p||'')].join('');function%20a(){if(!window.open([f,p].join(''),'mb',['toolbar=0,status=0,resizable=1,width=440,height=430,left=',(s.width-440)/2,',top=',(s.height-430)/2].join('')))u.href=[f,p].join('');};if(/Firefox/.test(navigator.userAgent))setTimeout(a,0);else%20a();})(screen,document,encodeURIComponent,'','','https://img.manongdao.com/sparkler-677774__340.jpg', '推荐 ら面具成の殇う 的文章《Download multiple files with a single action》','https://www.manongdao.com/article-7955.html','页面编码gb2312|utf-8默认gb2312'));){kind=link}
var links = [
\'https://s3.amazonaws.com/Minecraft.Download/launcher/Minecraft.exe\',
\'https://s3.amazonaws.com/Minecraft.Download/launcher/Minecraft.dmg\',
\'https://s3.amazonaws.com/Minecraft.Download/launcher/Minecraft.jar\'
];
function downloadAll(urls) {
var link = document.createElement(\'a\');
link.setAttribute(\'download\', null);
link.style.display = \'none\';
document.body.appendChild(link);
for (var i = 0; i < urls.length; i++) {
link.setAttribute(\'href\', urls[i]);
link.click();
}
document.body.removeChild(link);
}<button onclick=\"downloadAll(window.links)\">Test me!</button>You can create a temporary set of hidden iframes, initiate download by GET or POST inside of them, wait for downloads to start and remove iframes:
<!DOCTYPE HTML>
<html>
<body>
<button id=\"download\">Download</button>
<script type=\"text/javascript\" src=\"http://ajax.googleapis.com/ajax/libs/jquery/1.4/jquery.min.js\"></script>
<script type=\"text/javascript\">
$(\'#download\').click(function() {
download(\'http://nogin.info/cv.doc\',\'http://nogin.info/cv.doc\');
});
var download = function() {
for(var i=0; i<arguments.length; i++) {
var iframe = $(\'<iframe style=\"visibility: collapse;\"></iframe>\');
$(\'body\').append(iframe);
var content = iframe[0].contentDocument;
var form = \'<form action=\"\' + arguments[i] + \'\" method=\"GET\"></form>\';
content.write(form);
$(\'form\', content).submit();
setTimeout((function(iframe) {
return function() {
iframe.remove();
}
})(iframe), 2000);
}
}
</script>
</body>
</html>
Or, without jQuery:
function download(...urls) {
urls.forEach(url => {
let iframe = document.createElement(\'iframe\');
iframe.style.visibility = \'collapse\';
document.body.append(iframe);
iframe.contentDocument.write(
`<form action=\"${url.replace(/\\\"/g, \'\"\')}\" method=\"GET\"></form>`
);
iframe.contentDocument.forms[0].submit();
setTimeout(() => iframe.remove(), 2000);
});
}
This solution works across browsers, and does not trigger warnings. Rather than creating an iframe, here we creates a link for each file. This prevents warning messages from popping up.
To handle the looping part, we use setTimeout, which is necessary for it to work in IE.
/**
* Download a list of files.
* @author speedplane
*/
function download_files(files) {
function download_next(i) {
if (i >= files.length) {
return;
}
var a = document.createElement(\'a\');
a.href = files[i].download;
a.target = \'_parent\';
// Use a.download if available, it prevents plugins from opening.
if (\'download\' in a) {
a.download = files[i].filename;
}
// Add a to the doc for click to work.
(document.body || document.documentElement).appendChild(a);
if (a.click) {
a.click(); // The click method is supported by most browsers.
} else {
$(a).click(); // Backup using jquery
}
// Delete the temporary link.
a.parentNode.removeChild(a);
// Download the next file with a small timeout. The timeout is necessary
// for IE, which will otherwise only download the first file.
setTimeout(function() {
download_next(i + 1);
}, 500);
}
// Initiate the first download.
download_next(0);
}<script>
// Here\'s a live example that downloads three test text files:
function do_dl() {
download_files([
{ download: \"http://www.nt.az/reg.txt\", filename: \"regs.txt\" },
{ download: \"https://www.w3.org/TR/PNG/iso_8859-1.txt\", filename: \"standards.txt\" },
{ download: \"http://qiime.org/_static/Examples/File_Formats/Example_Mapping_File.txt\", filename: \"example.txt\" },
]);
};
</script>
<button onclick=\"do_dl();\">Test downloading 3 text files.</button>Easiest way would be to serve the multiple files bundled up into a ZIP file.
I suppose you could initiate multiple file downloads using a bunch of iframes or popups, but from a usability standpoint, a ZIP file is still better. Who wants to click through ten \"Save As\" dialogs that the browser will bring up?
A jQuery version of the iframe answers:
function download(files) {
$.each(files, function(key, value) {
$(\'<iframe></iframe>\')
.hide()
.attr(\'src\', value)
.appendTo($(\'body\'))
.load(function() {
var that = this;
setTimeout(function() {
$(that).remove();
}, 100);
});
});
}
<!doctype html>
<html ng-app=\'app\'>
<head>
<title>
</title>
<link rel=\"stylesheet\" href=\"http://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css\">
<link rel=\"stylesheet\" href=\"style.css\">
</head>
<body ng-cloack>
<div class=\"container\" ng-controller=\'FirstCtrl\'>
<table class=\"table table-bordered table-downloads\">
<thead>
<tr>
<th>Select</th>
<th>File name</th>
<th>Downloads</th>
</tr>
</thead>
<tbody>
<tr ng-repeat = \'tableData in tableDatas\'>
<td>
<div class=\"checkbox\">
<input type=\"checkbox\" name=\"{{tableData.name}}\" id=\"{{tableData.name}}\" value=\"{{tableData.name}}\" ng-model= \'tableData.checked\' ng-change=\"selected()\">
</div>
</td>
<td>{{tableData.fileName}}</td>
<td>
<a target=\"_self\" id=\"download-{{tableData.name}}\" ng-href=\"{{tableData.filePath}}\" class=\"btn btn-success pull-right downloadable\" download>download</a>
</td>
</tr>
</tbody>
</table>
<a class=\"btn btn-success pull-right\" ng-click=\'downloadAll()\'>download selected</a>
<p>{{selectedone}}</p>
</div>
<script src=\"https://ajax.googleapis.com/ajax/libs/jquery/1.12.0/jquery.min.js\"></script>
<script src=\"https://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular.min.js\"></script>
<script src=\"script.js\"></script>
</body>
</html>
app.js
var app = angular.module(\'app\', []);
app.controller(\'FirstCtrl\', [\'$scope\',\'$http\', \'$filter\', function($scope, $http, $filter){
$scope.tableDatas = [
{name: \'value1\', fileName:\'file1\', filePath: \'data/file1.txt\', selected: true},
{name: \'value2\', fileName:\'file2\', filePath: \'data/file2.txt\', selected: true},
{name: \'value3\', fileName:\'file3\', filePath: \'data/file3.txt\', selected: false},
{name: \'value4\', fileName:\'file4\', filePath: \'data/file4.txt\', selected: true},
{name: \'value5\', fileName:\'file5\', filePath: \'data/file5.txt\', selected: true},
{name: \'value6\', fileName:\'file6\', filePath: \'data/file6.txt\', selected: false},
];
$scope.application = [];
$scope.selected = function() {
$scope.application = $filter(\'filter\')($scope.tableDatas, {
checked: true
});
}
$scope.downloadAll = function(){
$scope.selectedone = [];
angular.forEach($scope.application,function(val){
$scope.selectedone.push(val.name);
$scope.id = val.name;
angular.element(\'#\'+val.name).closest(\'tr\').find(\'.downloadable\')[0].click();
});
}
}]);
working example: https://plnkr.co/edit/XynXRS7c742JPfCA3IpE?p=preview
I agree that a zip file is a neater solution... But if you have to push multiple file, here\'s the solution I came up with. It works in IE 9 and up (possibly lower version too - I haven\'t tested it), Firefox, Safari and Chrome. Chrome will display a message to user to obtain his agreement to download multiple files the first time your site use it.
function deleteIframe (iframe) {
iframe.remove();
}
function createIFrame (fileURL) {
var iframe = $(\'<iframe style=\"display:none\"></iframe>\');
iframe[0].src= fileURL;
$(\'body\').append(iframe);
timeout(deleteIframe, 60000, iframe);
}
// This function allows to pass parameters to the function in a timeout that are
// frozen and that works in IE9
function timeout(func, time) {
var args = [];
if (arguments.length >2) {
args = Array.prototype.slice.call(arguments, 2);
}
return setTimeout(function(){ return func.apply(null, args); }, time);
}
// IE will process only the first one if we put no delay
var wait = (isIE ? 1000 : 0);
for (var i = 0; i < files.length; i++) {
timeout(createIFrame, wait*i, files[i]);
}
The only side effect of this technique, is that user will see a delay between submit and the download dialog showing. To minimize this effect, I suggest you use the technique describe here and on this question Detect when browser receives file download that consist of setting a cookie with your file to know it has started download. You will have to check for this cookie on client side and to send it on server side. Don\'t forget to set the proper path for your cookie or you might not see it. You will also have to adapt the solution for multiple file download.
To improve on @Dmitry Nogin\'s answer: this worked in my case.
However, it\'s not tested, since I am not sure how the file dialogue works on various OS/browser combinations. (Thus community wiki.)
<script>
$(\'#download\').click(function () {
download([\'http://www.arcelormittal.com/ostrava/doc/cv.doc\',
\'http://www.arcelormittal.com/ostrava/doc/cv.doc\']);
});
var download = function (ar) {
var prevfun=function(){};
ar.forEach(function(address) {
var pp=prevfun;
var fun=function() {
var iframe = $(\'<iframe style=\"visibility: collapse;\"></iframe>\');
$(\'body\').append(iframe);
var content = iframe[0].contentDocument;
var form = \'<form action=\"\' + address + \'\" method=\"POST\"></form>\';
content.write(form);
$(form).submit();
setTimeout(function() {
$(document).one(\'mousemove\', function() { //<--slightly hacky!
iframe.remove();
pp();
});
},2000);
}
prevfun=fun;
});
prevfun();
}
</script>
<p class=\"style1\">
<a onclick=\"downloadAll(window.links)\">Balance Sheet Year 2014-2015</a>
</p>
<script>
var links = [
\'pdfs/IMG.pdf\',
\'pdfs/IMG_0001.pdf\',
\'pdfs/IMG_0002.pdf\',
\'pdfs/IMG_0003.pdf\',
\'pdfs/IMG_0004.pdf\',
\'pdfs/IMG_0005.pdf\',
\'pdfs/IMG_0006.pdf\'
];
function downloadAll(urls) {
var link = document.createElement(\'a\');
link.setAttribute(\'download\',\'Balance Sheet Year 2014-2015\');
link.style.display = \'none\';
document.body.appendChild(link);
for (var i = 0; i < urls.length; i++) {
link.setAttribute(\'href\', urls[i]);
link.click();
}
document.body.removeChild(link);
}
</script>
I am looking for a solution to do this, but unzipping the files in javascript was not as clean as I liked. I decided to encapsulate the files into a single SVG file.
If you have the files stored on the server (I don\'t), you can simply set the href in the SVG.
In my case, I\'ll convert the files to base64 and embed them in the SVG.
Edit: The SVG worked very well. If you are only going to download the files, ZIP might be better. If you are going to display the files, then SVG seems superior.
When using Ajax components it is possible to start multiple downloads. Therefore you have to use https://cwiki.apache.org/confluence/display/WICKET/AJAX+update+and+file+download+in+one+blow
Add an instance of AJAXDownload to your Page or whatever. Create an AjaxButton and override onSubmit. Create an AbstractAjaxTimerBehavior and start downloading.
button = new AjaxButton(\"button2\") {
private static final long serialVersionUID = 1L;
@Override
protected void onSubmit(AjaxRequestTarget target, Form<?> form)
{
MultiSitePage.this.info(this);
target.add(form);
form.add(new AbstractAjaxTimerBehavior(Duration.milliseconds(1)) {
@Override
protected void onTimer(AjaxRequestTarget target) {
download.initiate(target);
}
});
}
Happy downloading!
Below code 100% working.
Step 1: Paste below code in index.html file
<!DOCTYPE html>
<html ng-app=\"ang\">
<head>
<title>Angular Test</title>
<meta charset=\"utf-8\" />
</head>
<body>
<div ng-controller=\"myController\">
<button ng-click=\"files()\">Download All</button>
</div>
<script src=\"angular.min.js\"></script>
<script src=\"index.js\"></script>
</body>
</html>
Step 2: Paste below code in index.js file
\"use strict\";
var x = angular.module(\'ang\', []);
x.controller(\'myController\', function ($scope, $http) {
var arr = [
{file:\"http://localhost/angularProject/w3logo.jpg\", fileName: \"imageone\"},
{file:\"http://localhost/angularProject/cv.doc\", fileName: \"imagetwo\"},
{file:\"http://localhost/angularProject/91.png\", fileName: \"imagethree\"}
];
$scope.files = function() {
angular.forEach(arr, function(val, key) {
$http.get(val.file)
.then(function onSuccess(response) {
console.log(\'res\', response);
var link = document.createElement(\'a\');
link.setAttribute(\'download\', val.fileName);
link.setAttribute(\'href\', val.file);
link.style.display = \'none\';
document.body.appendChild(link);
link.click();
document.body.removeChild(link);
})
.catch(function onError(error) {
console.log(\'error\', error);
})
})
};
});
NOTE : Make sure that all three files which are going to download will be placed in same folder along with angularProject/index.html or angularProject/index.js files.
This works in all browsers (IE11, firefox, Edge, Chrome and Chrome Mobile) My documents are in multiple select elements. The browsers seem to have issues when you try to do it too fast... So I used a timeout.
//user clicks a download button to download all selected documents
$(\'#downloadDocumentsButton\').click(function () {
var interval = 1000;
//select elements have class name of \"document\"
$(\'.document\').each(function (index, element) {
var doc = $(element).val();
if (doc) {
setTimeout(function () {
window.location = doc;
}, interval * (index + 1));
}
});
});
This is a solution that uses promises:
function downloadDocs(docs) {
docs[0].then(function (result) {
if (result.web) {
window.open(result.doc);
}
else {
window.location = result.doc;
}
if (docs.length > 1) {
setTimeout(function () { return downloadDocs(docs.slice(1)); }, 2000);
}
});
}
$(\'#downloadDocumentsButton\').click(function () {
var files = [];
$(\'.document\').each(function (index, element) {
var doc = $(element).val();
var ext = doc.split(\'.\')[doc.split(\'.\').length - 1];
if (doc && $.inArray(ext, docTypes) > -1) {
files.unshift(Promise.resolve({ doc: doc, web: false }));
}
else if (doc && ($.inArray(ext, webTypes) > -1 || ext.includes(\'?\'))) {
files.push(Promise.resolve({ doc: doc, web: true }));
}
});
downloadDocs(files);
});
Getting list of url with ajax call and then use jquery plugin to download multiple files parallel.
$.ajax({
type: \"POST\",
url: URL,
contentType: \"application/json; charset=utf-8\",
dataType: \"json\",
data: data,
async: true,
cache: false,
beforeSend: function () {
blockUI(\"body\");
},
complete: function () { unblockUI(\"body\"); },
success: function (data) {
//here data --> contains list of urls with comma seperated
var listUrls= data.DownloadFilePaths.split(\',\');
listUrls.forEach(function (url) {
$.fileDownload(url);
});
return false;
},
error: function (result) {
$(\'#mdlNoDataExist\').modal(\'show\');
}
});
By far the easiest solution (at least in ubuntu/linux):
Works like a charm.
