I use spring mvc and JPA in my project. I get file as byte[] and save in Database. but when I want to display in <img tag of html it don't display.
my entity is:
class Photo {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
private String title;
#Lob
private byte[] profilePic;
// getter and setter
}
value in Database is:
but my server response is:
{
"id": 4,
"title": "pic 1",
"profilePic": "ZGF0YTppb...VFtQ0M=",
}
and display in html:
<img src='ZGF0YTppb...VFtQ0M=' />
//or
<img src='data:image/jpeg;base64,ZGF0YTppb...VFtQ0M=' />
What to do to display the photo?
thanks
Assuming it's base64 encoded:
<img src='data:image/jpeg;base64,ZGF0YTppb...VFtQ0M=' />
Basically you can use data urls with this format depending on what content [type] you want to display:
data:[<mime type>][;charset=<charset>][;base64],<encoded data>
HTML:
<img id="profileImg" src="">
JS:
document.getElementById("profileImg").src = "data:image/png;base64," + profilePic;
This assumes that your image is stored in PNG format (and base64 encoded). For other image format (JPEG, etc.), you need to change the MIME type ("image/..." part) in the URL.
I am using JavaScript to add comment without refreshing the page. When I am using JavaScript inside the template it is working perfectly fine but if I am writing the JavaScript to a file and loading the file inside the template then it is not displaying the name of the person who wrote the comment (It is displaying the comment fine). Below is the JavaScript I used inside the template:
function create_comment(event,div_id,form_id,commentinsert_id) {
event.preventDefault();
var text_id = '#'.concat(div_id,' ','#comment-text')
var slug_id = '#'.concat(div_id,' ','#post_slug')
var appenddiv_id = '#'.concat(div_id)
comment_count ++;
var divcommentinsert_id = 'inserted_comment-'.concat(comment_count.toString())
$.ajax({
url : "create_comment/", // the endpoint
type : "POST", // http method
data : { text : $(text_id).val(), post_slug: $(slug_id).val(),},
// handle a successful response
success : function(json) {
div.innerHTML = `
<div id = `+divcommentinsert_id+` class="card-footer">
<div class="row">
<div>
<img src="{{user.profile.profile_picture.url}}" alt="" width="40" height="40">
</div>
<div class="col-md-8">
<b style="color:rgb(240, 0, 0);"> {{user.first_name}} {{user.last_name}}</b>
<br>
`+json.text+`
<a onClick="edit_comment('`+json.slug+`','`+divcommentinsert_id+`','`+json.text+`')"><i class="fa fa-edit"></i></a>
<a onClick="delete_comment('`+json.slug+`','`+divcommentinsert_id+`')"><i class="fa fa-trash-o"></i></a>
</div>
</div>
</div>`;
document.getElementById(commentinsert_id).appendChild(div);
document.getElementById(form_id).reset();
},
// handle a non-successful response
error : function(xhr,errmsg,err) {
$('#results').html("<div class='alert-box alert radius' data-alert>Oops! We have encountered an error: "+errmsg+
" <a href='#' class='close'>×</a></div>"); // add the error to the dom
console.log(xhr.status + ": " + xhr.responseText); // provide a bit more info about the error to the console
}
});
};
In the above code <b style="color:rgb(240, 0, 0);"> {{user.first_name}} {{user.last_name}}</b> is used to display the name. It is displaying name of the person who added the comment but when I copy the same function to comments.js file and load the file like <script src="{% static 'scripts/comments.js' %}"></script> then its not displaying the name instead it is displaying {{user.first_name}} {{user.last_name}}. I am using this javascript in several pages, I thought it is best to write to file and load the file instead of writing the same script in every page. Can someone help me with this?
{{ dictionary.key }}, etc in a template is how you use variables with the django template engine.
A static javascript file is not a template. It isn't processed by the django template engine.
Put the values you need in your html (through the template engine), access them from JS.
Basic ideas:
Create a JS variable (eg: <script>var user_full_name = "{{ user.user_name }} {{ user.last_name }}"</script>), use user_full_name inside the ajax sucess callback.
Put the values inside some html element (eg: <input type="hidden" id="user_name" value="{{ user.user_name }}">) and get it with JS/jQuery $("#user_name").val().
edit: added missing closing double quote to the user_full_name declaration.
My code looks something like
var publishedDate = Convert.ToDateTime(node.GetProperty("publishedDate").Value);
string image = Umbraco.Content(node.Id).GetPropertyValue("postImage").src;
string categories = #node.GetProperty("categories").Value.Replace(",", ", ");
<div class="column">
<img class="post-image" src="#image">
<div class="post-details" data-equalizer-watch>
<h5 class="post-category">#categories</h5>
<h2 class="post-title">#node.Name</h2>
<h6 class="post-date">#string.Format("{0:MMMM dd, yyyy}", publishedDate)</h6>
</div>
</div>
and when I view the image source in Chrome using developer tools, the image src will end up looking like
src="/media/8354/collegis_blogs_design_jr_7-23_15_news.jpg?1499808181609"
the appended string after the jpg is causing the image to error out. This does not occur in Internet Explorer since no string gets appended. Anyone have any idea why this could be occuring?
thanks,
Depending on which version of Umbraco you are using I would get the media path like this:
for v7.6 and above
string imageUrl = Model.Content.GetPropertyValue<IPublishedContent>("headerImage").Url;
for v7.5x and below
UmbracoHelper uHelper = new UmbracoHelper(UmbracoContext.Current);
string mediaUrl = "";
if (CurrentPage.HasValue(propertyName))
{
var mediaItem = uHelper.Media(CurrentPage.propertyName.ToString());
mediaUrl = mediaItem.umbracoFile;
}
return mediaUrl;
See my blog post about it and for how to do it from a controller.
http://www.codeshare.co.uk/blog/how-to-get-the-file-path-of-a-media-item-in-umbraco/
When I upload files with dropzone it adds them to the database, but they don't have a file, just an ID and creation date. I think the view is the problem but I've tried tons of stuff and I can't figure it out. See my edit below for a more detailed account.
Here is the view
#login_required(login_url='/dashboard-login/')
def dashboard(request):
current_user = request.user
current_client = request.user.client
files = ClientUpload.objects.filter(client=current_client)
form = UploadFileForm()
if request.method == 'POST':
if request.FILES is None:
logger = logging.getLogger(__name__)
logger.warning("No files were attached to the upload.")
return HttpResponseBadRequest('No Files Attached.')
if form.is_valid():
upload = form.save()
form = UploadFileForm(request.POST, request.FILES)
else:
uploaded_files = [request.FILES.get('file_upload[%d]' % i)
for i in range(0, len(request.FILES))]
for f in uploaded_files:
client_upload = ClientUpload.objects.create(client=current_client, file_upload=f)
#for key in request.FILES:
# cupload = ClientUpload.objects.create(client=current_client, file_upload=request.FILES[key])
logger = logging.getLogger(__name__)
logger.debug(request.FILES)
logger.info("File(s) uploaded from " + current_client.company)
return HttpResponseRedirect(reverse('dashboard'))
data = {'form': form, 'client': current_client, 'files': files}
return render_to_response('dashboard.html', data, context_instance=RequestContext(request))
Here are my dz options:
url: '127.0.0.1:8003/dashboard/',
method: "post",
withCredentials: false,
parallelUploads: 12,
uploadMultiple: true,
maxFilesize: 256*4*2,
paramName: "file_upload",
createImageThumbnails: true,
maxThumbnailFilesize: 20,
thumbnailWidth: 100,
thumbnailHeight: 100,
maxFiles: 12,
params: {},
clickable: true,
ignoreHiddenFiles: true,
acceptedFiles: null,
acceptedMimeTypes: null,
autoProcessQueue: false,
addRemoveLinks: true,
previewsContainer: null,
dictDefaultMessage: "Drop files here to upload",
dictFallbackMessage: "Your browser does not support drag and drop file uploads.",
dictFallbackText: "Please use the fallback form below to upload your files.",
dictFileTooBig: "File is too big ({{filesize}}MB). Max filesize: {{maxFilesize}}MB.",
dictInvalidFileType: "You can't upload files of this type.",
dictResponseError: "Server responded with {{statusCode}} code.",
dictCancelUpload: "Cancel upload",
dictCancelUploadConfirmation: "Are you sure you want to cancel this upload?",
dictRemoveFile: "Remove",
dictRemoveFileConfirmation: null,
dictMaxFilesExceeded: "You can only upload {{maxFiles}} files.",
And here is the template:
{% load i18n %}
{% load staticfiles %}
{% load crispy_forms_tags %}
<link href="{% static 'css/dropzone2.css' %}" type="text/css" rel="stylesheet"/>
<form class="dropzone" id="myDropzone" method="post" action="{% url 'dashboard' %}" enctype="multipart/form-data">
{% csrf_token %}
<div class="fallback">
<input name="file" type="file" multiple />
</div>
</form>
<button class="upload-control btn-success btn" type="submit" id='submit-all' onclick="document.getElementById('myDropzone').submit()">
<i class="glyphicon glyphicon-upload"></i>
<span>{% trans 'Submit' %}</span>
</button>
<style>
.upload-control {
margin-top: 10px;
margin-bottom: 0px;
}
</style>
<script src="{% static 'js/dropzone.js' %}"></script>
<script src="{% static 'js/jquery-2.1.4.min.js' %}"></script>
<script type="text/javascript">
Dropzone.autoDiscover = false
$(document).ready(function() {
Dropzone.options.myDropzone = {
init : function() {
var submitButton = document.querySelector("#submit-all")
myDropzone = this;
submitButton.addEventListener("click", function(e) {
e.stopPropagation();
e.preventDefault();
myDropzone.processQueue();
});
this.on("sendingmultiple", function() {
// Figure out what I want here or if I want at all
});
this.on("successmultiple", function(files, response) {
window.location.reload();
});
this.on("errormultiple", function(files, response) {
// Figure out what I want here or if I want at all
});
}
// Do I need this?
//myDropzone.on('success', myDropzone.processQueue.bind(myDropzone));
};
});
</script>
EDIT:
It works now after adding http:// to the url setting. But when I upload a file it is added to the database, but the file field is blank. The multivaluedict shows the file when I print it out, but when it is saved to the database the file field has nothing in it.
When I upload one file I get this in request.FILES:
<MultiValueDict: {u'file_upload[]': [<InMemoryUploadedFile: normal.PNG (image/png)>]}>
When I upload two I get this in request.FILES:
<MultiValueDict: {u'file_upload[]': [<TemporaryUploadedFile: normal.PNG (image/png)>]}>
Despite being two files it only shows the one, but adds them both to the database (both without files and just ID and creation date). Also what is TemporaryUploadedFile and InMemoryUploadedFile?
It should have indexes in the u'file_upload[]' when I upload more than one but it doesn't. I have the settings correct for uploading multiples.
But I can't seem to get them out of the MultiValueDict. And when I try something like:
for upload in request.FILES:
client_upload = ClientUpload.objects.create(client=current_client, file_upload=upload)
I run into that problem where the admin panel shows an ID and time but no file. It happens when uploading one or more. I'm not sure what the difference is between InMemoryUploadedfile and TemporaryUploadedFile either. How can I extract the files from the MultiValueDict? get() is not working, with the list comp I just get an empty list.
The other odd thing, is when I upload certain files the MultiValueDict is empty, and with others it is not. Also it seems that my view gets called more than once (according to the log outputs) and that is normal, except it should be a post then redirect to a get, but it seems to have more than one post request. I checked the dev tools in chrome and I only see one, but oddly it outputs my log statement twice for every time I submit. I know the issue is probably in my view but I've tried a ton of stuff and can't figure out what is wrong.
Anybody have any ideas?
I'm working with Dropzone and Django myself for creating Image objects for each file uploaded, which seems to be akin to what you want to do. I'd like to point out some things that I've experienced and show you how I'm doing it to see if that helps.
What you need
The things that you need in order to create a record in the Database for files uploaded with Dropzone is:
The Dropzone HTML form
The Javascript initialization of Dropzone.
A Django View to handle the uploaded files.
I don't understand what you're doing with the Form (is it just validating?) but it seems to be unnecessary. You don't need it (and don't use it) to actually save the file.
Accessing the uploaded files
First lets talk about how to access the files in request.FILES. By setting uploadMultiple: true on your Dropzone configuration you condition Dropzone not to send dzfile but to send each file represented as dzfile[%d] (i.e. dzfile[0], dzfile[1], etc).
Even if that was not the case you're using request.FILES like if it was a list (for f in request.FILES), but like you point out it's actually a dict.
Here's what Python shows when I print request.FILES:
<MultiValueDict: {u'dzfile[1]': [<InMemoryUploadedFile: image2.jpg (image/jpeg)>], u'dzfile[2]': [<InMemoryUploadedFile: image3.jpg (image/jpeg)>], u'dzfile[0]': [<InMemoryUploadedFile: image1.jpg (image/jpeg)>]}>
To access the actual files you need to get each key by it's name.
files = [request.FILES.get('dzfile[%d]' % i)
for i in range(0, len(request.FILES))]
NOW you have the file list you wanted. Simply iterate through it and create your objects however you want. I'm not sure on how your Models work so I'm going to approximate.
for f in files:
# Create a ClientUpload object by setting its FK to client and
# FileField to the file. Correct me if I deduced the models incorrectly
client_upload = ClientUpload.objects.create(
client=current_client,
file_upload=f,
)
That should be enough to create the objects that you want.
Dropzone Javascript
It seems that in the Click event listener you add to the submit button you have to add
e.preventDefault();
e.stopPropagation();
before calling processQueue() to avoid a double form submission.
As to the sendingmultiple, successmultiple and errormultiple, what do you want to happen there? The comments are just there to indicate when those events are trigered.
I personally use:
this.on('sendingmultiple', function () {
// `sendingmultiple` to hide the submit button
$('#my-dropzone').find('button[type=submit]').hide();
});
this.on('successmultiple', function (files, response) {
// `successmultiple` to reload the page (and show the updated info)
window.location.reload();
});
this.on('errormultiple', function (files, response) {
// `errormultiple` to un-hide the button
$('#my-dropzone').find('button[type=submit]').show();
});
But of course you can do what you want.
And finally, what do you intend to happen with that last line in the <script> tag? I don't quite understand it, it looks like if you wanted to re-process the queue on success. It seems not to belong there.
Comment if anything's off, but this setup works fine for me.
In your Javascript, I think you want to use this for the paramName:
paramName: "file_upload",
in order for a Django Form or ModelForm to recognize the uploaded files.
Also make sure that the upload request is using a multipart/form-data content type.
Also, try this instead of "get_list":
dz_files = request.FILES.getlist("file_upload")
I don't know if what i show now will help you specifically but maybe it will help others,Working with dropzone made me do a workaround because ajax, files and django combined are always a little complicated.
so in my html i have this code:
<div class="logos">
<i class="fa fa-upload" id="dropzone_icon" data-name="icon" title="{% trans "Drag and drop or click" %}" alt="{% trans "Drag and drop or click" %}" ></i>
<input type="hidden" name="icon" value="" >
<input type="hidden" name="icon_name" value="" >
<div class="img-holder">
<img title='{% trans "Upload a Company Icon" %}' id="img_icon" alt='{% trans "Company icon" %}' src="{* icon *}"/>
</div>
<label>{% trans "Company Icon" %}</label>
</div>
in my js i got this:
dropz = new Dropzone(value, {
url: "branding/dropzone",
maxFiles: 1,
acceptedFiles: "image/*",
thumbnail: function(file, dataUrl) {
/* change existing image */
var file_type = file.name.split('.');
file_type = file_type[file_type.length - 1];
if(!(file_type=="png" || file_type=="jpg" || file_type=="jpeg")){
createAlert('file type must be .png, .jpg or .jpeg', '#pp_content', 'alert');
return false;
}
$("input[name='icon']").val(dataUrl.split(",")[1]);
$("input[name='icon_name']").val(file.name);
$("#img_" + type).prop("src", dataUrl);
this.removeFile(file);
},
previewTemplate: "<span></span>",
autoProcessQueue: false
});
this tells dropzone to insert into the values into the inputs(the base64 presentation of the image, and the file name) so basically i'm sending the image as a string.
after sending the inputs as a form in the ajax, this is how i handle them in my views.py:
import datetime
from django.core.files.base import ContentFile
def base64_to_image(img_b64,img_name):
"""
Creates image file from bas64 encoded data
:param img_b64: base64 data
:param img_name: filename for created image
:return: file or false if there's no data
"""
if img_b64:
image_data = b64decode(img_b64)
img_file = ContentFile(image_data,datetime.datetime.now().strftime("%y%d%m_%H%M%S") + img_name)
return img_file
else:
return False
company.icon = base64_to_image(request.POST["icon"], request.POST["icon_name"])
company.save()
this is my work around working with dropzone, maybe it will help others here as well
I have been searching through wherever possible but got no help at all for this question.
I am working on a small program using python GAE with backbone javascript, I want the user can create a new book with a html form given below and store the new book in the GAE datastore, the form contains strings and an image.
<form>
<div><label>Title:</label> <input type="text" id="title" name="book_title" ></div>
<div><label>Author:</label> <input type="text" id="author" name="book_author" ></div>
<div><label>Picture:</label> <input id="image" type="file" class="upload" name="img" /></div>
<div><img id="img_preview" src="#" alt="image" ></img></div>
<div><button class="create_book">Create Book</button></div>
</form>
selecting a book picture from the local file system is handled by displayPicture method in order to load a thumbnail image on the page for preview.
clicking "Create Book" button event is handled by the createBook method in javascript file:
event:{
"click .create_book": "createBook" ,
"change .upload": "displayPicture",
......
},
createBook:function(){
this.model.set({
title: $('#title').val(),
author: $('#author').val(),
image: this.pictureFile.name
});
......
app.bookList.create(this.model,{wait:true,
success:function(){
alert("A new book has been created!");
}
});
return false;
},
......
displayPicture: function(evt){
var files = evt.target.files;
if(files){
this.pictureFile = files[0];
var reader = new FileReader();
reader.onloadend = function(){
$('#img_preview').attr('src',reader.result).width(200).height(200);
};
reader.readAsDataURL(this.pictureFile);
},
..........
at the python server end:
class Book(db.Model):
title = db.StringProperty()
author = db.StringProperty()
image = db.BlobProperty()
class createBook(webapp.RequestHandler):
def post(self):
book = Book()
book.title = self.request.get("title")
book.author = self.request.get("author")
book.image = db.Blob(self.request.get("image"))
book.put()
......
application = webapp.WSGIApplication(
[
.....
('/books/?',createBook)
],
debug=Ture
)
I can only display the thumbnail picture on the page for preview, but fail to create the new book, the line "app.bookList.create(...)" does send a POST request to the python server end, and the request is handled by the "createBook" method, but Firebug shows the "self.request.get("title"/"author"/"image")" lines are just an empty string, which means the content of the form is not retrieved from the Http request properly.
can you tell what are the problems in my code snippet ? thanks for your help.
I think that your problem is likely that you are passing a model in to create. From the Backbone docs:
create collection.create(attributes, [options])
Convenience to create a new instance of a model within a collection.
create isn't expecting a model, because it creates a model; what it's expecting is a raw JSON object (eg. {foo: bar}).
*EDIT* Actually, that's incorrect, create can accept an (un-saved) model; leaving the next few lines here any way so this doesn't get too confusing.
You could fix this by doing:
app.bookList.create(this.model.attributes, {wait:true,
or:
app.bookList.create(this.model.toJSON(), {wait:true,
but really you don't need to use create at all because you don't need to create a model (you already have one). What you (probably) want to do is add the model you have to the collection:
app.bookList.add(this.model)
and then sync it with the server separately:
this.model.save(null, {wait:true,
success:function(){
alert("A new book has been created!");
}
});
In the python side, you should get the data from
self.request.body
Not
self.request.get('xxx')