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.
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>
HTTP does not support more than one file download at once.
There are two solutions:
Open x amount of windows to initiate the file downloads (this would be done with JavaScript)
preferred solution create a script to zip the files
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.
Update 2021: I am aware that the "run code snippet" no longer works, but that's due to cross site cookie issues. The code works fine if deployed on your own site.
/**
* 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: "https://stackoverflow.com/robots.txt", filename: "robots.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>
The following script done this job gracefully.
var urls = [
'https://images.pexels.com/photos/432360/pexels-photo-432360.jpeg',
'https://images.pexels.com/photos/39899/rose-red-tea-rose-regatta-39899.jpeg'
];
function downloadAll(urls) {
for (var i = 0; i < urls.length; i++) {
forceDownload(urls[i], urls[i].substring(urls[i].lastIndexOf('/')+1,urls[i].length))
}
}
function forceDownload(url, fileName){
var xhr = new XMLHttpRequest();
xhr.open("GET", url, true);
xhr.responseType = "blob";
xhr.onload = function(){
var urlCreator = window.URL || window.webkitURL;
var imageUrl = urlCreator.createObjectURL(this.response);
var tag = document.createElement('a');
tag.href = imageUrl;
tag.download = fileName;
document.body.appendChild(tag);
tag.click();
document.body.removeChild(tag);
}
xhr.send();
}
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);
});
});
}
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.
Angular solution:
HTML
<!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
To solve this, I created a JS library to stream multiple files directly into a zip on the client-side. The main unique feature is that it has no size limits from memory (everything is streamed) nor zip format (it uses zip64 if the contents are more than 4GB).
Since it doesn't do compression, it is also very performant.
Find "downzip" it on npm or github!
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);
});
By far the easiest solution (at least in ubuntu/linux):
make a text file with the urls of the files to download (i.e. file.txt)
put the 'file.txt' in the directory where you want to download the files
open the terminal in the download directory from the previous lin
download the files with the command 'wget -i file.txt'
Works like a charm.
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() {
$(document).one('mousemove', function() { //<--slightly hacky!
iframe.remove();
pp();
});
},2000);
}
prevfun=fun;
});
prevfun();
}
</script>
I am looking for a solution to do this, but unzipping the files in javascript was not as clean as I liked. I decided to encapsulate the files into a single SVG file.
If you have the files stored on the server (I don't), you can simply set the href in the SVG.
In my case, I'll convert the files to base64 and embed them in the SVG.
Edit: The SVG worked very well. If you are only going to download the files, ZIP might be better. If you are going to display the files, then SVG seems superior.
When using Ajax components it is possible to start multiple downloads. Therefore you have to use https://cwiki.apache.org/confluence/display/WICKET/AJAX+update+and+file+download+in+one+blow
Add an instance of AJAXDownload to your Page or whatever. Create an AjaxButton and override onSubmit. Create an AbstractAjaxTimerBehavior and start downloading.
button = new AjaxButton("button2") {
private static final long serialVersionUID = 1L;
#Override
protected void onSubmit(AjaxRequestTarget target, Form<?> form)
{
MultiSitePage.this.info(this);
target.add(form);
form.add(new AbstractAjaxTimerBehavior(Duration.milliseconds(1)) {
#Override
protected void onTimer(AjaxRequestTarget target) {
download.initiate(target);
}
});
}
Happy downloading!
Below code 100% working.
Step 1: Paste below code in index.html file
<!DOCTYPE html>
<html ng-app="ang">
<head>
<title>Angular Test</title>
<meta charset="utf-8" />
</head>
<body>
<div ng-controller="myController">
<button ng-click="files()">Download All</button>
</div>
<script src="angular.min.js"></script>
<script src="index.js"></script>
</body>
</html>
Step 2: Paste below code in index.js file
"use strict";
var x = angular.module('ang', []);
x.controller('myController', function ($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.
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');
}
});
Here is the way I do that. I open multiple ZIP but also other kind of data (I export projet in PDF and at same time many ZIPs with document).
I just copy past part of my code.
The call from a button in a list:
$url_pdf = "pdf.php?id=7";
$url_zip1 = "zip.php?id=8";
$url_zip2 = "zip.php?id=9";
$btn_pdf = "<a href=\"javascript:;\" onClick=\"return open_multiple('','".$url_pdf.",".$url_zip1.",".$url_zip2."');\">\n";
$btn_pdf .= "<img src=\"../../../images/icones/pdf.png\" alt=\"Ver\">\n";
$btn_pdf .= "</a>\n"
So a basic call to a JS routine (Vanilla rules!).
here is the JS routine:
function open_multiple(base,url_publication)
{
// URL of pages to open are coma separated
tab_url = url_publication.split(",");
var nb = tab_url.length;
// Loop against URL
for (var x = 0; x < nb; x++)
{
window.open(tab_url[x]);
}
// Base is the dest of the caller page as
// sometimes I need it to refresh
if (base != "")
{
window.location.href = base;
}
}
The trick is to NOT give the direct link of the ZIP file but to send it to the browser. Like this:
$type_mime = "application/zip, application/x-compressed-zip";
$the_mime = "Content-type: ".$type_mime;
$tdoc_size = filesize ($the_zip_path);
$the_length = "Content-Length: " . $tdoc_size;
$tdoc_nom = "Pesquisa.zip";
$the_content_disposition = "Content-Disposition: attachment; filename=\"".$tdoc_nom."\"";
header("Cache-Control: no-cache, must-revalidate"); // HTTP/1.1
header("Expires: Sat, 26 Jul 1997 05:00:00 GMT"); // Date in the past
header($the_mime);
header($the_length);
header($the_content_disposition);
// Clear the cache or some "sh..." will be added
ob_clean();
flush();
readfile($the_zip_path);
exit();
<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 attempted to convert java array to js array. but it gives error as "k cannot be resolved to a variable".x.getrows returns array.
<% MySQLAccess x=new MySQLAccess();%>
<% String b[]=x.getRows();%>
var message="<%out.print(b[0]);%>"
console.log(message)
var data=new Array();
<% for(int k=0;k<b.length ;k++) %>
<% {%>
var temp=<%= b[k] %>
data[<% =k %>]=temp;
<%}%>
#user2815407 What you are receiving in your string array? May be something like [str1,str2,str3]. If so you can easily convert this string array into js array.
var values = [];
values = //Your_string_array
//Iterate through each value
$.each(values, function( index, value ) {
console.log(value);
});
See this fiddle. This may not be optimal way to convert java to js array. Hope this will give you some idea. Let me know if this helps.
I advice not to use scriplets, but here's the solution to your problem :
<% String b[] = new String[]{"10", "20", "30"};%>
var message = "<%out.print(b[0]);%>"
console.log(message)
var data = new Array();
<% for(int k=0;k<b.length;k++){%>
var temp =<%=b[k]%>
data[<%=k%>] = temp;
<%}%>
The error was just un-necessary spaces.
My advice to fix this code: forget about it:
you should NEVER use scriptlets in JSPs
JS string literals need quotes around them, and escaped quotes and other escaped special chars inside
JSON is the tool you should use.
So, in your controller, use
request.setAttribute("jsArray", someJsonSerializer.toJson(javaArray));
And in your JSP:
var data = ${jsArray};
When I run this code I get a blank screen and nothing gets displayed.What changes I have to make in order to get this right and where am I going wrong?
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"> </script>
<script>
$(document).ready(function() {
$.getJSON("https://maps.googleapis.com/maps/api/place/search/json?location=-33.8670522,151.1957362&radius=500&types=food&name=harbour&sensor=false&key=AIzaSyC1BIAzM34uk6SLY40s-nmXMivPJDfWgTc",
function(data, textStatus){
alert(data);
$.each(data.results,function(i, name) {;
$("#placenames").append(i+':'+name.vicinity+'<br/>');
});
});
});
</script>
</head>
<body>
<div id="placenames"></div>
</body>
</html>
Have you tried using Google Maps Javascript API? It does all the JSONP stuff for you.
Here is a demo with your coordinates: http://jsfiddle.net/ThinkingStiff/CjfcX/
Script:
var places = new google.maps.places.PlacesService( document.createElement( 'div' ) ),
searchRequest = {
name: 'harbour',
location: new google.maps.LatLng( -33.8670522, 151.1957362 ),
radius: 500,
types: ['food']
};
places.search( searchRequest, function ( results, status ) {
var html = '';
for ( var index = 0; index < results.length; index++ ) {
html +=
'<li '
+ 'data-location-id="' + results[index].id + '" '
+ 'data-address="' + results[index].vicinity + '" '
+ 'data-latitude="' + results[index].geometry.location.lat() + '" '
+ 'data-longitude="' + results[index].geometry.location.lng() + '" '
+ 'data-name="' + results[index].name + '">'
+ '<div>' + results[index].name + '</div>'
+ '<div>' + results[index].vicinity + '</div>'
+ '</li>';
};
document.getElementById( 'results' ).innerHTML = html;
} );
HTML:
<script src="http://maps.googleapis.com/maps/api/js?libraries=places,geometry&sensor=true"></script>
<ul id="results"></ul>
Output:
Google API does not support the callback/JSONP from a jQuery get/getJSON at this time
To load async, you need to do something like this:
function loadScript() {
var script = document.createElement("script");
script.type = "text/javascript";
script.src = "http://maps.googleapis.com/maps/api/js?sensor=false&callback=initialize";
document.body.appendChild(script);
}
http://code.google.com/apis/maps/documentation/javascript/basics.html#Async
You have to add this querystring so that it is parsed as jsonp:
&callback=?
See this blog post for more information:
http://www.mattcashatt.com/post/index/Obtaining-and-Parsing-Open-Social-Graph-Data-with-JSONP-and-jQuery
looking for a javascript class like swfobject to embed java and have a simple fallback if the user doesn't have java or refuses the security prompt.
thanks,
Josh
You could build one pretty easily.
Have something like a div set up like this:
<div id="java-applet">
Message to user saying that they need Java here
</div>
Then add Java Plugin Detection (builder) to your JavaScript. Then if that returns true, then do something like:
document.getElementById("java-applet").innerHTML = "<applet>stuff here</applet>";
appletobject may work, but I have not used it.
Just embed the applet like you normally do and insert the fallback inside or insert a javascript snippet to remove the object: Besides param, you can add other elements, e.g. paragraphs with text or javascript calling some function to replace the object.
<script type="text/javascript">
function replace_object(x) {
$(x)...
}
</script>
<object x="y" id="some_applet">
<param name="y" value="z">
<p>java not available. some alternative here. <!-- option 1 --></p>
<script type="text/javascript">
replace_object('some_applet'); // option 2
</script>
</object>
This helps!
I got a very strange problem while using applet to do batch file downloading from the server side.
The Ajax request seems conflict with applet request, the applet file downloading interrupted with some socket exception.
The applet works fine under JRE5.0, it might be caused by our recent upgrade to JRE6.0.
<div id="java-applet"></div>
<script>
var t;
function startApplet() {
var attributes = {codebase:'<%=request.getContextPath()%>',
code:'<%=appletClass%>',
archive:'applet/SignedApplet.jar',
width:0,
height:0} ;
var parameters = {para1:'value1',
para2:'value2',
java_arguments:'-Xms64m -Xmx512m'
} ;
var version = '1.6' ;
var buildAppletTag = function() {
var tag = '<applet';
for (var attribute in attributes){
tag += (' ' + attribute + '="' + attributes[attribute] + '"');
}
tag += ">";
for (var parameter in parameters){
tag += '<param name="' + parameter + '" value="' + parameters[parameter] + '"/>';
}
tag += '</applet>';
return tag;
};
document.getElementById("java-applet").innerHTML = buildAppletTag(attributes, parameters, version);
clearTimeout(t);
}
t = setTimeout("startApplet()", 1000); // delayed
</script>