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Eli Grey
2011-07-14 23:28:11 -04:00
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/* FileSaver.js
* A saveAs() FileSaver implementation.
* 2011-07-13
*
* By Eli Grey, http://eligrey.com
* License: X11/MIT
* See LICENSE.md
*/
/*global self, open, setTimeout */
/*jslint bitwise: true, regexp: true, confusion: true, es5: true, vars: true, white: true,
plusplus: true */
/*! @source http://purl.eligrey.com/github/FileSaver.js/blob/master/FileSaver.js */
var saveAs = saveAs || (function(view) {
"use strict";
var
URL = view.URL || view.webkitURL || view
, webkit_req_fs = view.webkitRequestFileSystem
, req_fs = view.requestFileSystem || webkit_req_fs || view.mozRequestFileSystem
, throw_outside = function (ex) {
(view.setImmediate || setTimeout)(function() {
throw ex;
}, 0);
}
, force_saveable_type = "application/octet-stream"
, fs_min_size = 0
, deletion_queue = []
, process_deletion_queue = function() {
var i = deletion_queue.length;
while (i--) {
var file = deletion_queue[i];
if (typeof file === "string") { // file is an object URL
URL.revokeObjectURL(file);
} else { // file is a File
file.remove();
}
}
deletion_queue.length = 0; // clear queue
}
, dispatch = function(filesaver, event_types, event) {
event_types = [].concat(event_types);
var i = event_types.length;
while (i--) {
var listener = filesaver["on" + event_types[i]];
if (typeof listener === "function") {
try {
listener.call(filesaver, event || filesaver);
} catch (ex) {
throw_outside(ex);
}
}
}
}
, FileSaver = function(blob, name) {
var
filesaver = this
, type = blob.type
// on any filesys errors revert to saving with object URLs
, fs_error = function() {
var object_url = URL.createObjectURL(blob);
target_view.location.href = object_url;
deletion_queue.push(object_url);
filesaver.readyState = 2; // DONE
dispatch(filesaver, "writestart progress write writeend".split(" "));
}
, abortable = function(func) {
return function() {
if (filesaver.readyState !== 2) { // DONE
return func.apply(this, arguments);
}
};
}
, target_view
;
filesaver.readyState = filesaver.INIT;
if (!name) {
name = "download";
}
// Object and web filesystem URLs have a problem saving in WebKit when viewed
// in a tab, so I force object URLs to save with application/octet-stream
// and web filesystem URLs to save by appending .download to the filename.
if (blob.webkitSlice && type !== force_saveable_type) {
blob = blob.webkitSlice(0, blob.size, force_saveable_type);
}
if (webkit_req_fs && name !== "download") {
name += ".download";
}
if (type === force_saveable_type || webkit_req_fs) {
target_view = self;
} else {
target_view = open();
}
if (!req_fs) {
fs_error();
return;
}
fs_min_size += blob.size;
req_fs(view.TEMPORARY, fs_min_size, abortable(function(fs) {
fs.root.getDirectory("saved", {create:true, exclusive: false}, abortable(function(dir) {
var save = function() {
dir.getFile(name, {create:true, exclusive: false}, abortable(function(file) {
file.createWriter(abortable(function(writer) {
writer.onwriteend = function(event) {
target_view.location.href = file.toURL();
deletion_queue.push(file);
filesaver.readyState = filesaver.DONE;
dispatch(filesaver, "writeend", event);
};
writer.onerror = function() {
var error = writer.error;
if (error.code !== error.ABORT_ERR) {
fs_error();
}
};
"writestart progress write abort".split(" ").forEach(function(event) {
writer["on" + event] = filesaver["on" + event];
});
writer.write(blob);
filesaver.abort = function() {
writer.abort();
filesaver.readyState = filesaver.DONE;
};
filesaver.readyState = filesaver.WRITING;
}), fs_error);
}), fs_error);
};
dir.getFile(name, {create: false}, abortable(function(file) {
// delete file if it already exists
file.remove();
save();
}), abortable(function(ex) {
if (ex.code === ex.NOT_FOUND_ERR) {
save();
} else {
fs_error();
}
}));
}), fs_error);
}), fs_error);
}
, FS_proto = FileSaver.prototype
, saveAs = function(blob, name) {
return new FileSaver(blob, name);
}
;
FS_proto.abort = function() {
var filesaver = this;
filesaver.readyState = filesaver.DONE;
dispatch(filesaver, "abort");
};
FS_proto.readyState = FS_proto.INIT = 0;
FS_proto.WRITING = 1;
FS_proto.DONE = 2;
FS_proto.error =
FS_proto.onwritestart =
FS_proto.onprogress =
FS_proto.onwrite =
FS_proto.onabort =
FS_proto.onerror =
FS_proto.onwriteend =
null;
view.addEventListener("unload", process_deletion_queue, false);
return saveAs;
}(self));
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/*! @source http://purl.eligrey.com/github/FileSaver.js/blob/master/FileSaver.js */
var saveAs=saveAs||(function(l){"use strict";var k=l.URL||l.webkitURL||l,f=l.webkitRequestFileSystem,m=l.requestFileSystem||f||l.mozRequestFileSystem,c=function(n){(l.setImmediate||setTimeout)(function(){throw n},0)},j="application/octet-stream",h=0,g=[],e=function(){var o=g.length;while(o--){var n=g[o];if(typeof n==="string"){k.revokeObjectURL(n)}else{n.remove()}}g.length=0},i=function(o,n,r){n=[].concat(n);var q=n.length;while(q--){var s=o["on"+n[q]];if(typeof s==="function"){try{s.call(o,r||o)}catch(p){c(p)}}}},b=function(o,q){var n=this,r=o.type,t=function(){var u=k.createObjectURL(o);p.location.href=u;g.push(u);n.readyState=2;i(n,"writestart progress write writeend".split(" "))},s=function(u){return function(){if(n.readyState!==2){return u.apply(this,arguments)}}},p;n.readyState=n.INIT;if(!q){q="download"}if(o.webkitSlice&&r!==j){o=o.webkitSlice(0,o.size,j)}if(f&&q!=="download"){q+=".download"}if(r===j||f){p=self}else{p=open()}if(!m){t();return}h+=o.size;m(l.TEMPORARY,h,s(function(u){u.root.getDirectory("saved",{create:true,exclusive:false},s(function(v){var w=function(){v.getFile(q,{create:true,exclusive:false},s(function(x){x.createWriter(s(function(y){y.onwriteend=function(z){p.location.href=x.toURL();g.push(x);n.readyState=n.DONE;i(n,"writeend",z)};y.onerror=function(){var z=y.error;if(z.code!==z.ABORT_ERR){t()}};"writestart progress write abort".split(" ").forEach(function(z){y["on"+z]=n["on"+z]});y.write(o);n.abort=function(){y.abort();n.readyState=n.DONE};n.readyState=n.WRITING}),t)}),t)};v.getFile(q,{create:false},s(function(x){x.remove();w()}),s(function(x){if(x.code===x.NOT_FOUND_ERR){w()}else{t()}}))}),t)}),t)},a=b.prototype,d=function(n,o){return new b(n,o)};a.abort=function(){var n=this;n.readyState=n.DONE;i(n,"abort")};a.readyState=a.INIT=0;a.WRITING=1;a.DONE=2;a.error=a.onwritestart=a.onprogress=a.onwrite=a.onabort=a.onerror=a.onwriteend=null;l.addEventListener("unload",e,false);return d}(self));
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This software is licensed under the MIT/X11 license.
MIT/X11 license
---------------
Copyright © 2011 [Eli Grey][1].
Permission is hereby granted, free of charge, to any person
obtaining a copy of this software and associated documentation
files (the "Software"), to deal in the Software without
restriction, including without limitation the rights to use,
copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following
conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.
[1]: http://eligrey.com
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FileSaver.js
============
FileSaver.js implements the W3C `saveAs()` [FileSaver][1] interface in browsers that do
not natively support it. There is a [FileSaver.js demo][2] that demonstrates saving
various media types.
FileSaver.js is the solution to saving files on the client side, and is perfect for
webapps that need to generate files or for saving sensitive information that shouldn't be
sent to an external server.
Supported Browsers
------------------
* Firefox 4+
* †Google Chrome
* Opera 11+
* Safari 5+
Unlisted versions of browsers (e.g. Firefox 3.6) will probably work too; I just haven't
tested them.
† Google Chrome 14+ supports saving with filenames
Syntax
------
FileSaver saveAs(in Blob data, in DOMString filename);
Examples
--------
### Saving text
var bb = new BlobBuilder;
bb.append("Hello, world!");
saveAs(bb.getBlob("text/plain;charset=utf-8"), "hello world.txt");
The standard W3C File API [`BlobBuilder`][3] interface is not available in all browsers.
[BlobBuilder.js][4] is a cross-browser `BlobBuilder` implementation that solves this.
### Saving a canvas
var canvas = document.getElementById("my-canvas"), ctx = canvas.getContext("2d");
// draw to canvas...
canvas.toBlob(function(blob) {
saveAs(blob, "pretty image.png");
});
Note: The standard HTML5 `canvas.toBlob()` method is not available in all browsers.
[canvas-toBlob.js][5] is a cross-browser `canvas.toBlob()` implementation that solves
this.
### Doing something after a file is saved
var filesaver = saveAs(blob, "secret stuff that you won't send to a server.truecrypt");
filesaver.onwriteend = function() {
// file saved, do something here
};
### Aborting a save
var filesaver = saveAs(blob, "whatever");
cancel_button.addEventListener("click", function() {
filesaver.abort();
}, false);
This isn't that useful unless you're saving very large files (e.g. generated video).
[1]: http://www.w3.org/TR/file-writer-api/#the-filesaver-interface
[2]: http://oftn.org/projects/FileSaver.js/demo/
[3]: http://www.w3.org/TR/file-writer-api/#the-blobbuilder-interface
[4]: https://github.com/eligrey/BlobBuilder.js
[5]: https://github.com/eligrey/canvas-toBlob.js
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html {
background-color: #DDD;
}
body {
width: 900px;
margin: 0 auto;
font-family: Verdana, Helvetica, Arial, sans-serif;
box-shadow: 0 0 5px #000;
box-shadow: 0 0 10px 2px rgba(0, 0, 0, .5);
padding: 7px 25px;
background-color: #FFF;
}
h1, h2, h3, h4, h5, h6 {
font-family: Georgia, "Times New Roman", serif;
}
h2, form {
text-align: center;
}
form {
margin-top: 5px;
}
.input {
width: 500px;
height: 300px;
margin: 0 auto;
display: block;
}
section {
margin-top: 40px;
}
dt {
font-weight: bold;
font-size: larger;
}
#canvas {
cursor: crosshair;
}
#canvas, #html {
border: 1px solid black;
}
.filename {
text-align: right;
}
#html {
box-sizing: border-box;
ms-box-sizing: border-box;
webkit-box-sizing: border-box;
moz-box-sizing: border-box;
overflow: auto;
padding: 1em;
}
dt:target {
background-color: Highlight;
color: HighlightText;
}
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/* FileSaver.js demo script
* 2011-07-14
*
* By Eli Grey, http://eligrey.com
* License: X11/MIT
* See LICENSE.md
*/
/*! @source http://purl.eligrey.com/github/FileSaver.js/blob/master/demo/demo.js */
(function(view) {
"use strict";
// The canvas drawing portion of the demo is based off the demo at
// http://www.williammalone.com/articles/create-html5-canvas-javascript-drawing-app/
var
document = view.document
, $ = function(id) {
return document.getElementById(id);
}
, session = view.sessionStorage
, BlobBuilder = view.BlobBuilder || view.WebKitBlobBuilder || view.MozBlobBuilder
, canvas = $("canvas")
, canvas_options_form = $("canvas-options")
, canvas_filename = $("canvas-filename")
, canvas_clear_button = $("canvas-clear")
, text = $("text")
, text_options_form = $("text-options")
, text_filename = $("text-filename")
, html = $("html")
, html_options_form = $("html-options")
, html_filename = $("html-filename")
, ctx = canvas.getContext("2d")
, drawing = false
, x_points = session.x_points || []
, y_points = session.y_points || []
, drag_points = session.drag_points || []
, add_point = function(x, y, dragging) {
x_points.push(x);
y_points.push(y);
drag_points.push(dragging);
}
, draw = function(){
canvas.width = canvas.width;
ctx.lineWidth = 6;
ctx.lineJoin = "round";
ctx.strokeStyle = "#000000";
var
i = 0
, len = x_points.length
;
for(; i < len; i++) {
ctx.beginPath();
if (i && drag_points[i]) {
ctx.moveTo(x_points[i-1], y_points[i-1]);
} else {
ctx.moveTo(x_points[i]-1, y_points[i]);
}
ctx.lineTo(x_points[i], y_points[i]);
ctx.closePath();
ctx.stroke();
}
}
, stop_drawing = function() {
drawing = false;
}
// Title guesser and document creator available at https://gist.github.com/1059648
, guess_title = function(doc) {
var
h = "h6 h5 h4 h3 h2 h1".split(" ")
, i = h.length
, headers
, header_text
;
while (i--) {
headers = doc.getElementsByTagName(h[i]);
for (var j = 0, len = headers.length; j < len; j++) {
header_text = headers[j].textContent.trim();
if (header_text) {
return header_text;
}
}
}
}
, doc_impl = document.implementation
, create_html_doc = function(html) {
var
dt = doc_impl.createDocumentType('html', null, null)
, doc = doc_impl.createDocument("http://www.w3.org/1999/xhtml", "html", dt)
, doc_el = doc.documentElement
, head = doc_el.appendChild(doc.createElement("head"))
, charset_meta = head.appendChild(doc.createElement("meta"))
, title = head.appendChild(doc.createElement("title"))
, body = doc_el.appendChild(doc.createElement("body"))
, i = 0
, len = html.childNodes.length
;
charset_meta.setAttribute("charset", html.ownerDocument.characterSet);
for (; i < len; i++) {
body.appendChild(doc.importNode(html.childNodes.item(i), true));
}
var title_text = guess_title(doc);
if (title_text) {
title.appendChild(doc.createTextNode(title_text));
}
return doc;
}
;
canvas.width = 500;
canvas.height = 300;
if (typeof x_points === "string") {
x_points = JSON.parse(x_points);
} if (typeof y_points === "string") {
y_points = JSON.parse(y_points);
} if (typeof drag_points === "string") {
drag_points = JSON.parse(drag_points);
} if (session.canvas_filename) {
canvas_filename.value = session.canvas_filename;
} if (session.text) {
text.value = session.text;
} if (session.text_filename) {
text_filename.value = session.text_filename;
} if (session.html) {
html.innerHTML = session.html;
} if (session.html_filename) {
html_filename.value = session.html_filename;
}
drawing = true;
draw();
drawing = false;
canvas_clear_button.addEventListener("click", function() {
canvas.width = canvas.width;
x_points.length =
y_points.length =
drag_points.length =
0;
}, false);
canvas.addEventListener("mousedown", function(event) {
drawing = true;
add_point(event.pageX - canvas.offsetLeft, event.pageY - canvas.offsetTop, false);
draw();
}, false);
canvas.addEventListener("mousemove", function(event) {
if (drawing) {
add_point(event.pageX - canvas.offsetLeft, event.pageY - canvas.offsetTop, true);
draw();
}
}, false);
canvas.addEventListener("mouseup", stop_drawing, false);
canvas.addEventListener("mouseout", stop_drawing, false);
canvas_options_form.addEventListener("submit", function(event) {
event.preventDefault();
canvas.toBlob(function(blob) {
saveAs(
blob
, (canvas_filename.value || canvas_filename.placeholder) + ".png"
);
}, "image/png");
}, false);
text_options_form.addEventListener("submit", function(event) {
event.preventDefault();
var bb = new BlobBuilder;
bb.append(text.value || text.placeholder);
saveAs(
bb.getBlob("text/plain;charset=" + document.characterSet)
, (text_filename.value || text_filename.placeholder) + ".txt"
);
}, false);
html_options_form.addEventListener("submit", function(event) {
event.preventDefault();
var
bb = new BlobBuilder
, xml_serializer = new XMLSerializer
, doc = create_html_doc(html)
;
bb.append(xml_serializer.serializeToString(doc));
saveAs(
bb.getBlob("application/xhtml+xml;charset=" + document.characterSet)
, (html_filename.value || html_filename.placeholder) + ".xhtml"
);
}, false);
view.addEventListener("unload", function() {
session.x_points = JSON.stringify(x_points);
session.y_points = JSON.stringify(y_points);
session.drag_points = JSON.stringify(drag_points);
session.canvas_filename = canvas_filename.value;
session.text = text.value;
session.text_filename = text_filename.value;
session.html = html.innerHTML;
session.html_filename = html_filename.value;
}, false);
}(self));
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/*! @source http://purl.eligrey.com/github/FileSaver.js/blob/master/demo/demo.js */
(function(o){"use strict";var t=o.document,g=function(A){return t.getElementById(A)},b=o.sessionStorage,j=o.BlobBuilder||o.WebKitBlobBuilder||o.MozBlobBuilder,f=g("canvas"),s=g("canvas-options"),y=g("canvas-filename"),q=g("canvas-clear"),r=g("text"),u=g("text-options"),h=g("text-filename"),n=g("html"),e=g("html-options"),i=g("html-filename"),v=f.getContext("2d"),z=false,a=b.x_points||[],p=b.y_points||[],d=b.drag_points||[],k=function(A,C,B){a.push(A);p.push(C);d.push(B)},m=function(){f.width=f.width;v.lineWidth=6;v.lineJoin="round";v.strokeStyle="#000000";var B=0,A=a.length;for(;B<A;B++){v.beginPath();if(B&&d[B]){v.moveTo(a[B-1],p[B-1])}else{v.moveTo(a[B]-1,p[B])}v.lineTo(a[B],p[B]);v.closePath();v.stroke()}},c=function(){z=false},x=function(E){var D="h6 h5 h4 h3 h2 h1".split(" "),C=D.length,F,G;while(C--){F=E.getElementsByTagName(D[C]);for(var B=0,A=F.length;B<A;B++){G=F[B].textContent.trim();if(G){return G}}}},w=t.implementation,l=function(D){var B=w.createDocumentType("html",null,null),J=w.createDocument("http://www.w3.org/1999/xhtml","html",B),A=J.documentElement,H=A.appendChild(J.createElement("head")),K=H.appendChild(J.createElement("meta")),I=H.appendChild(J.createElement("title")),E=A.appendChild(J.createElement("body")),C=0,G=D.childNodes.length;K.setAttribute("charset",D.ownerDocument.characterSet);for(;C<G;C++){E.appendChild(J.importNode(D.childNodes.item(C),true))}var F=x(J);if(F){I.appendChild(J.createTextNode(F))}return J};f.width=500;f.height=300;if(typeof a==="string"){a=JSON.parse(a)}if(typeof p==="string"){p=JSON.parse(p)}if(typeof d==="string"){d=JSON.parse(d)}if(b.canvas_filename){y.value=b.canvas_filename}if(b.text){r.value=b.text}if(b.text_filename){h.value=b.text_filename}if(b.html){n.innerHTML=b.html}if(b.html_filename){i.value=b.html_filename}z=true;m();z=false;q.addEventListener("click",function(){f.width=f.width;a.length=p.length=d.length=0},false);f.addEventListener("mousedown",function(A){z=true;k(A.pageX-f.offsetLeft,A.pageY-f.offsetTop,false);m()},false);f.addEventListener("mousemove",function(A){if(z){k(A.pageX-f.offsetLeft,A.pageY-f.offsetTop,true);m()}},false);f.addEventListener("mouseup",c,false);f.addEventListener("mouseout",c,false);s.addEventListener("submit",function(A){A.preventDefault();f.toBlob(function(B){saveAs(B,(y.value||y.placeholder)+".png")},"image/png")},false);u.addEventListener("submit",function(A){A.preventDefault();var B=new j;B.append(r.value||r.placeholder);saveAs(B.getBlob("text/plain;charset="+t.characterSet),(h.value||h.placeholder)+".txt")},false);e.addEventListener("submit",function(B){B.preventDefault();var D=new j,A=new XMLSerializer,C=l(n);D.append(A.serializeToString(C));saveAs(D.getBlob("application/xhtml+xml;charset="+t.characterSet),(i.value||i.placeholder)+".xhtml")},false);o.addEventListener("unload",function(){b.x_points=JSON.stringify(a);b.y_points=JSON.stringify(p);b.drag_points=JSON.stringify(d);b.canvas_filename=y.value;b.text=r.value;b.text_filename=h.value;b.html=n.innerHTML;b.html_filename=i.value},false)}(self));
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<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" dir="ltr" lang="en-US-x-Hixie">
<head>
<meta charset="utf-8"/>
<title>FileSaver.js Demo</title>
<link rel="stylesheet" type="text/css" href="https://raw.github.com/eligrey/FileSaver.js/master/demo/demo.css"/>
</head>
<body>
<h1><a href="https://github.com/eligrey/FileSaver.js">FileSaver.js</a> Demo</h1>
<p>
The following examples demonstrate how it is possible to generate and save any type of data right in the browser using the W3C <code>saveAs()</code> <a href="http://www.w3.org/TR/file-writer-api/#the-filesaver-interface">FileSaver</a> interface, without contacting any servers.
</p>
<section id="image-demo">
<h2>Saving an image</h2>
<canvas class="input" id="canvas" width="500" height="300"/>
<form id="canvas-options">
<label>Filename: <input type="text" class="filename" id="canvas-filename" placeholder="doodle"/>.png</label>
<input type="submit" value="Save"/>
<input type="button" id="canvas-clear" value="Clear"/>
</form>
</section>
<section id="text-demo">
<h2>Saving text</h2>
<textarea class="input" id="text" placeholder="Once upon a time..."/>
<form id="text-options">
<label>Filename: <input type="text" class="filename" id="text-filename" placeholder="a plain document"/>.txt</label>
<input type="submit" value="Save"/>
</form>
</section>
<section id="html-demo">
<h2>Saving rich text</h2>
<div class="input" id="html" contenteditable="">
<h3>Some example rich text</h3>
<ul>
<li><del>Plain</del> <ins>Boring</ins> text.</li>
<li><em>Emphasized text!</em></li>
<li><strong>Strong text!</strong></li>
<li>
<svg xmlns="http://www.w3.org/2000/svg" version="1.1" width="70" height="70">
<circle cx="35" cy="35" r="35" fill="red"/>
<text x="10" y="40">image</text>
</svg>
</li>
<li><a href="https://github.com/eligrey/FileSaver.js">A link.</a></li>
</ul>
</div>
<form id="html-options">
<label>Filename: <input type="text" class="filename" id="html-filename" placeholder="a rich document"/>.xhtml</label>
<input type="submit" value="Save"/>
</form>
</section>
<section id="faq">
<h1>FAQ</h1>
<dl>
<dt>Why isn't my filename saved?</dt>
<dd>
<p>
Saving with filenames is only available in browsers that natively support either <code><a href="http://www.w3.org/TR/file-system-api/#using-localfilesystem">LocalFileSystem</a></code> or <code><a href="http://www.w3.org/TR/file-writer-api/#the-filesaver-interface">FileSaver</a></code>, such as <a href="http://www.chromium.org/getting-involved/dev-channel">Google Chrome 14 dev</a>. To enable <code>LocalFileSystem</code> in Google Chrome 14 dev, launch the browser with the <code>--allow-file-access-from-files</code> and <code>--unlimited-quota-for-files</code> flags.
</p>
</dd>
</dl>
</section>
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