Get a local file from plugin to javascript - javascript

I have developped a brower plugin that Acquire a picture from a Scanner or a Camera and save the picture in the file system of the user.
The output is the filepath to the picture.
I want to preview the picture in the Broswer, using javascript...
How can I get the picture without user interaction ?
( part of a Web App only compatible with Google Chrome)

If you have the filepath returned by your browser plugin and you have identified the event when you have to display the image then you can call ShowImage(filepath) function on that event.
<script type="text/javascript">
function ShowImage(filePath) {
$("#preview").append("<img alt='img' src='" + filePath + "'");
}
</script>
Your HTML should contain the div:
<div id="preview"></div>

If you have the contents of the image already you can load them in directly, by base64 encoding it and providing an URL as follows:
<img src="data:image/png;base64,iVBORw0KGgoAAAANS..." />

Related

JavaScript - How to download image from fetched in network [duplicate]

This is crazy but I don't know how to do this, and because of how common the words are, it's hard to find what I need on search engines. I'm thinking this should be an easy one to answer.
I want a simple file download, that would do the same as this:
Download!
But I want to use an HTML button, e.g. either of these:
<input type="button" value="Download!">
<button>Download!</button>
Likewise, is it possible to trigger a simple download via JavaScript?
$("#fileRequest").click(function(){ /* code to download? */ });
I'm definitely not looking for a way to create an anchor that looks like a button, use any back-end scripts, or mess with server headers or mime types.
You can trigger a download with the HTML5 download attribute.
Download
Where:
path_to_file is a path that resolves to an URL on the same origin. That means the page and the file must share the same domain, subdomain, protocol (HTTP vs. HTTPS), and port (if specified). Exceptions are blob: and data: (which always work), and file: (which never works).
proposed_file_name is the filename to save to. If it is blank, the browser defaults to the file's name.
Documentation: MDN, HTML Standard on downloading, HTML Standard on download, CanIUse
For the button you can do
<form method="get" action="file.doc">
<button type="submit">Download!</button>
</form>
HTML:
<button type="submit" onclick="window.open('file.doc')">Download!</button>
A simple JS solution:
function download(url) {
const a = document.createElement('a')
a.href = url
a.download = url.split('/').pop()
document.body.appendChild(a)
a.click()
document.body.removeChild(a)
}
With jQuery:
$("#fileRequest").click(function() {
// hope the server sets Content-Disposition: attachment!
window.location = 'file.doc';
});
You can do it with "trick" with invisible iframe. When you set "src" to it, browser reacts as if you would click a link with the same "href". As opposite to solution with form, it enables you to embed additional logic, for example activating download after timeout, when some conditions are met etc.
It is also very silient, there's no blinking new window/tab like when using window.open.
HTML:
<iframe id="invisible" style="display:none;"></iframe>
Javascript:
function download() {
var iframe = document.getElementById('invisible');
iframe.src = "file.doc";
}
Bootstrap Version
<a class="btn btn-danger" role="button" href="path_to_file"
download="proposed_file_name">
Download
</a>
Documented in Bootstrap 4 docs, and works in Bootstrap 3 as well.
I think this is the solution you were looking for
<button type="submit" onclick="window.location.href='file.doc'">Download!</button>
I hade a case where my Javascript generated a CSV file. Since there is no remote URL to download it I use the following implementation.
downloadCSV: function(data){
var MIME_TYPE = "text/csv";
var blob = new Blob([data], {type: MIME_TYPE});
window.location.href = window.URL.createObjectURL(blob);
}
You can hide the download link and make the button click it.
<button onclick="document.getElementById('link').click()">Download!</button>
<a id="link" href="file.doc" download hidden></a>
What about:
<input type="button" value="Download Now!" onclick="window.location = 'file.doc';">
In my testing the following works for all file types and browsers as long as you use a relative link:
<button>Download 2</button>
/assets/hello.txt is just a relative path on my site. Change it to your own relative path.
my_file.txt is the name you want the file to be called when it is downloaded.
Explanation
I noticed there were comments under a lot of the answers that said the browser would just try to open the file itself rather than downloading it depending on the file type. I discovered this to be true.
I made two buttons to test it out using two different methods:
<button onclick="window.location.href='/assets/hello.txt';">Download 1</button>
<button>Download 2</button>
Notes:
Button 1 opened the text file in a new browser tab. However, Button 1 would download the file for file types that it couldn't open itself (for example, .apk files).
Button 2 downloaded the text file. However, Button 2 only downloaded the file if the path was relative. When I changed the path to an absolute path, then the browser opened it in a new tab.
I tested this on Firefox, Safari, and Chrome.
Hello I just include the word 'download' and works well.
<a href="file.pdf" download>Download</a>
So in javascript you can use the follow:
function onStartedDownload(id) {
console.log(`Started downloading: ${id}`);
}
function onFailed(error) {
console.log(`Download failed: ${error}`);
}
var downloadUrl = "https://example.org/image.png";
var downloading = browser.downloads.download({
url : downloadUrl,
filename : 'my-image-again.png',
conflictAction : 'uniquify'
});
downloading.then(onStartedDownload, onFailed);
If your looking for a vanilla JavaScript (no jQuery) solution and without using the HTML5 attribute you could try this.
const download = document.getElementById("fileRequest");
download.addEventListener('click', request);
function request() {
window.location = 'document.docx';
}
.dwnld-cta {
border-radius: 15px 15px;
width: 100px;
line-height: 22px
}
<h1>Download File</h1>
<button id="fileRequest" class="dwnld-cta">Download</button>
<button>Download!</button>
This will download the file as .doc file extension is not supported to be opened in browser.
One of the simplest way for button and the text-decoration will help to alter or to remove the text decoration of the link.
Anywhere between your <body> and </body> tags, put in a button using the below code:
<button>
<a href="file.doc" download>Click to Download!</a>
</button>
This is sure to work!
all you need to do is add Download after the file name which you have entered:
Before:
Download!
After
<a href="file.doc" Download >Download!</a>
Make sure the download is written with a capital letter otherwise it's not gonna work.
This is what finally worked for me since the file to be downloaded was determined when the page is loaded.
JS to update the form's action attribute:
function setFormAction() {
document.getElementById("myDownloadButtonForm").action = //some code to get the filename;
}
Calling JS to update the form's action attribute:
<body onLoad="setFormAction();">
Form tag with the submit button:
<form method="get" id="myDownloadButtonForm" action="">
Click to open document:
<button type="submit">Open Document</button>
</form>
The following did NOT work:
<form method="get" id="myDownloadButtonForm" action="javascript:someFunctionToReturnFileName();">
If you can't use form, another approach with downloadjs fit nice. Downloadjs use blob and html 5 file API under the hood:
<div onClick=(()=>{downloadjs(url, filename)})/>
*it's jsx/react syntax, but can be used in pure html
Not really an answer to the original question but it may help others which face similar situations as myself.
If the file you want to download is not hosted on the same origin but you want to be able to download it, you can do that with the Content-Disposition header. Make sure the server includes the header when responding to requests of the file.
Setting a value like
Content-Disposition: attachment will ensure that the file will be downloaded instead of viewed in the browser.
A simple Download pointing to your file should download it in this case.
If you want
Download
for the ability to download files that would be rendered by the browser otherwise, But still want a neat javascript function to use in a button; you can have an invisible link in html and click it in javascript.
function download_file() {
document.getElementById("my_download").click()
}
<a id="my_download" href="path_to_file" download="file_name" style="display:none;"></a>
<button onClick="download_file()">Download!!!</button>
Another way of doing in case you have a complex URL such as file.doc?foo=bar&jon=doe is to add hidden field inside the form
<form method="get" action="file.doc">
<input type="hidden" name="foo" value="bar" />
<input type="hidden" name="john" value="doe" />
<button type="submit">Download Now</button>
</form>
inspired on #Cfreak answer which is not complete
The solution I have come up with is that you can use download attribute in anchor tag but it will only work if your html file is on the server. but you may have a question like while designing a simple html page how can we check that for that you can use VS code live server or bracket live server and you will see your download attribute will work but if you will try to open it simply by just double clicking html page it open the file instead of downloading it.
conclusion: attribute download in anchor tag only works if your html file is no server.
For me ading button instead of anchor text works really well.
<button>Download!</button>
It might not be ok by most rules, but it looks pretty good.
If you use the <a> tag, do not forget to use the entire url which leads to the file -- i.e.:
Download

Image file not being recognized from local directory using javascript?

I have images inside this location:
C:\Users\AshwinPC\Desktop\vemployee\src\main\webapp\upload
There are number of images inside this image folder.
So,I am using following method to load the image :
$(document).ready(function(){
loopforData();
function loopForData(){
var newDataList=[];
newDataList=[{"id":1,"iNumber":"i1231223","fullName":"Ashiwn Karki","joinedDate":"10/12/2019","position":"SE","reportsTo":"ASDD","cubicleNo":"23","jobType":"ASAS","fileData":null}];
var text="";
for (var i=0;i<newDataList.length;i++){
var r = newDataList[i];
console.log(r);
text +="<div class='col-lg-4 col-md-4 col-sm-4 col-xs-12'>"+
"<div class='box-part text-center'>"+
"<img src='C:\\Users\\AshwinPC\\Desktop\\vemployee\\src\\main\\webapp\\upload\\"+r.iNumber+"'>"+
"<div class='title'>"+
"<h4> Full Name :"+ r.fullName +"</h4>"+
"</div>"+
"<div class='text'>"+
"<span>Inumner : '+newDataList[i].iNumber}+'</span></br>"+
"<span>Joined Date : '+newDataList[i].joinedDate}+'</span></br>"+
"<span>Position : '+newDataList[i].position}+'</span></br>"+
"<span>Reports to: '+newDataList[i].reportsTo}+'</span></br>"+
"<span>Cubicle No: '+newDataList[i].cubicleNo}+'</span></br>"+
"<span>Job Type:'+newDataList[i].jobType}+'</span></br>"+
"</div>"+
"<span>Reports to: newDataList[i].reportsTo}</span>"
+
"</div>"
}
console.log(text);
$("#abc").html(text);
}
});
<div class="row" id="abc">
</div>
This function populates the data inside this above div:
The problem is that JS is not recognizing the path of my image files.The console is being printed as:
How can I load the images in javascript?I am using spring boot.
It's not possible, while I realize the browser can open that image if you drag and drop it, it’s displaying it in the view pane that’s different from the viewport used to render HTML and run JavaScript. The viewport can only access resources via http request. You'd have to upload it somewhere or setup local web server. After that, be sure you include the file extension (IE .jpg)
Imagine the security risk of JS being able to access files from your local disk! They could convert it from the page element to base64 and send it off to the interwebs.

Use ajax to send image file to python (flask)

I have an image on my website being updated every 5 seconds (using PubNub and a Raspberry Pi. I use JavaScript to update the image source). This works fine. My problem is I am trying to use Ajax to send the source file to python (flask) and store that file in a MySQL database. Then I want to display the file name on the website. I am new to java script/ ajax.
Here is my java script:
<script type=text/javascript>
$(function() {
$('img#imageid').bind( function() {
$.getJSON('/_button', {
proglang: document.getElementById('imageid').src,
}, function(data) {
$("#buttonState").text(data.result);
});
});
});
</script>
The img#imageid is the id of the current image and the #buttonstate is where i would like to have the image file name displayed
Here is my html:
<img id="imageid" src="http://searchengineland.com/figz/wp-content/seloads/2015/12/google-amp-fast-speed-travel-ss-1920-800x450.jpg">
<form>
<p>The button is <span id="buttonState"></span></p>
<br>
</form>
I do not want to use GET or POST. I would like to to automatically send to the python file every time the image source changes.
Here is my Flask view:
#app.route("/_button")
def _button():
try:
lang = request.args.get('proglang')
c.execute ("""UPDATE pictures SET file_name=%s WHERE user_id=%s""",
(str(lang), str(session['user_id'])))
return jsonify(buttonState=lang)
except Exception as e:
return render_template("500.html", error = str(e))

{"errors":["Invalid image URL"]} with aviary integration

I am doing image editing integration with Aviary.
Below is the html code
<body>
<a href="#" onclick="return launchEditor('editableimage1','http://www.html5canvastutorials.com/demos/assets/darth-vader.jpg');">
<img id="editableimage1" src="http://www.html5canvastutorials.com/demos/assets/darth-vader.jpg"/></a>
<br>
<form id="myform" action="" method="post">
<input id="hf" type="hidden" name="url">
<input type="submit" value="Save" />
</form>
<script type="text/javascript" src="http://feather.aviary.com/js/feather.js"></script>
<!-- Instantiate the widget -->
<script type="text/javascript">
var featherEditor = new Aviary.Feather({
apiKey: '1234567',
apiVersion: 3,
theme: 'light',
tools: ['draw','text'],
onSave: function(imageID, newURL) {
var img = document.getElementById(imageID);
img.src = newURL;
console.log('newURL '+newURL);
document.getElementById("hf").value=newURL;
featherEditor.close();
//document.forms["myform"].submit();
}
});
function launchEditor(id, src) {
featherEditor.launch({
image: id,
url: src
});
return false;
}
</script>
</body>
On opening the above html:
Image will be rendered.
On click of the image, image editing tool will open with the image in it.
But if I replace the url with any other image url say http://ipaddress:8080/ImageCheck/imgjsp.jsp which actually renders image in the browser.
Image will be rendered.
On click of the image, image editing tool opens and close immediately with the error {"errors":["Invalid image URL"]} . Tool is unable to get image into its server for editing from my UrL.
What is the difference between "http://ipaddress:8080/ImageCheck/imgjsp.jsp" and "http://www.html5canvastutorials.com/demos/assets/darth-vader.jpg" for tool to behave differently. Any help appreciated
We are getting the same error too, I've did some searching and found this:
https://creativesdk.zendesk.com/hc/en-us/articles/202903359-Migrating-from-the-Aviary-SDK-to-the-Adobe-Creative-SDK-Beta
It looks like Aviary has updated their API
is http://ipaddress:8080/ImageCheck/imgjsp.jsp points to local ip?
according to https://creativesdk.adobe.com/docs/web/#/articles/gettingstarted/index.html, "requires that the image at the location be publicly available as our server must download it.".
On the other hand, we were able to pass base64 encoded image as a value for url parameter. This way, no need to have actual image to be stored first.
(This approach is not working for us when using hi-res version of Aviary image tool).

Angularjs download image and display

I'm trying to download an image with Angularjs and then save it to mongodb and display it in the future.
First I just try to download image binary and display it and it doesn't work.
$scope.downloadProfileImage = function()
{
//Getting the user that logged in through facebook
$authentication.getUserInfoWithoutLocation(function(respone)
{
//getting the url for the profile picture from facebook
FB.api('/'+respone.id+'/picture',function(respone)
{
//the response hold the url of the profile picutre..trying to download it
$http.get(respone.data.url).success(function(success)
{
//success is the image binary,encoding it to base64 and bound to it
$scope.img = Base64.encode(success)
})
})
})
}
in the html I just have <img ng-src="{{img}}"/>.
this doesn't work.. why?
even if I remove the base64 encoding and bind $scope.img to success it still does now show the image..
please help me.
Thanks!.
In order to display an image encoded in base64 it has to be in following form:
<img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAADIA..." />
So you probably have to add data:image/png;base64, in front of your $scope.img. Of course it depends what your image format is (png, jpeg, gif).
Can you just use the URL in ngSrc?
FB.api('/'+respone.id+'/picture',function(respone)
{
$scope.imgSrc = respone.data.url;
});
View
<img ng-src="{{ imgSrc }}" />
First of all check whether the image is successfully encoded into base64 or not. I think so. Now before displaying it just add this "data:image/png;base64," to the base64 string.
Here is the sample
In angularjs file
$scope.picValue="data:image/png;base64,"+base64String;
In html page
<img ng-src="{{picValue}}" />

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