Before you continue reading, trust me when I say I have read all the other posts on this subject, and none of them helped.
I am trying to add image upload functionality to my website. I want to upload the image
via an ajax post. I cannot get this working.
Here is what I have:
HTML - i have a special setup so that an image is displayed instead of a stupid button
and the text field. I am also using the onChange event to automatically submit when I have hit "OK" after selecting the image.
<form id="add-picture-form" method="POST" action="/api/upload_image/" enctype="multipart/form-data">{% csrf_token %}
<div class="thumbnails" style="width:400px;">
<label class="cabinet BrandHeader">
<input type="file" class="file" id="upload-photo" onChange="$('#add-picture-form').submit();" />
</label>
</div>
</form>
Jquery:
$('#add-picture-form').submit(function() {
//var filename = $("#upload-photo").val();
var photo = document.getElementById("upload-photo");
var file = photo.files[0];
$.ajax({
type: "POST",
url: "/api/upload_image/",
enctype: 'multipart/form-data',
data: {'file': file.getAsBinary(), 'fname' : file.fileName },
success: function(){
alert( "Data Uploaded: ");
}
});
return false;
});
Finally my django view that is hit when you post to /api/upload_image/
def ajax_upload( request ):
print request.POST
print request.FILES
return http.HttpResponse(simplejson.dumps([True]), mimetype='application/javascript')
I have tried to write the image to binary, but I cannot open that data that has written.
Why is uploading an image using javascript so hard? I am an idiot and just not using a simple solution? If so, please tell me what is the best way to use jQuery to upload an image in Django.
Try the jQuery plugins Uploadify or SWFUpload. Someone even did the Django integration for you, see: https://github.com/tstone/django-uploadify and http://blog.fogtunes.com/2009/11/howto-integrate-swfupload-with-django/.
I'm not that familiar with django but I think the issue is that uploading a file via AJAX isn't as simple as you might think.
There are several methods of getting around this, but I recommend using one that already exists. Since you are using jquery, I would recommend the jquery forms plugin: http://jquery.malsup.com/form/#getting-started
The plugin supports file uploading out of the box, and really all you'll need to do is wire it up to your form:
$('#add-picture-form').ajaxForm();
see also: How can I upload files asynchronously?
Related
I have a django project in which I would like to upload all images to S3. I have installed boto3 and am able to print out my buckets. Thus I know I have a definite connection. Now my next step is to push a file to S3 using ajax. Below is the current setup I have. Will this approach work? One problem I have stumbled upon is the fact that Chrome returns C:\fakepath\filename.
Django view:
def change_project_image(request):
image = request.POST['image']
data = open(image, 'rb')
s3.Bucket('bucket-name').put_object(Key='filename.jpg', Body=data)
return HttpResponse('temporary return')
Javascript:
$('#project-image-upload').on('change', function(){
var image = $(this).val();
$.post('/project/change-project-image/', {image:image} function(data){
}, 'json');
});
HTML:
<label class="btn btn-default btn-file">
Browse <input id="project-image-upload" type="file">
</label>
So I took a different approach and was able to access the object in the view. I added the input to a form which posts to my desired view and then I handle the file like so:
def change_project_image(request):
image = request.FILES['image']
#now I need to pull the temporary path of image and pass it to boto
data = open('path_to_file', 'rb')
s3.Bucket('bucket_name').put_object(Key='filename.jpg', Body=data)
The problem I had was that I forgot to add enctype="multipart/form-data" in my form so request.FILES['image'] was empty.
I am learning ASP.NET MVC. I have to submit a to controller side after validation in client-side(in jquery). How this can be done? Should i use <form action="#" method="post"> instead of <form action="Controller/Method" method="post"> and add an event handler in click event of submit button of , to send via ajax etc? What should i do? pls help
You are on the right track, and what you suggested will work.
A better method would be to leave the original action intact, providing backwards compatibility to older browsers. You would then create the event handler as normal, and include code to prevent the default submit behavior, and use ajax instead.
$('#submitbutton').live('click', function(e){ e.preventDefault(); });
The easiest way to do this is to use the jQuery forms plugin.
This is my go-to plugin for this type of thing. Basically it will take your existing form, action url etc and convert the submission to an ajax call automatically. From the website:
The jQuery Form Plugin allows you to easily and unobtrusively upgrade
HTML forms to use AJAX. The main methods, ajaxForm and ajaxSubmit,
gather information from the form element to determine how to manage
the submit process. Both of these methods support numerous options
which allows you to have full control over how the data is submitted.
It is extremely useful for sites hosted in low cost web hosting
providers with limited features and functionality. Submitting a form
with AJAX doesn't get any easier than this!
It will also degrade gracefully if, for some reason, javascript is disabled. Take a look at the website, there are a bunch of clear examples and demos.
This is how I do:
In jQuery:
$('document').ready(function() {
$('input[name=submit]').click(function(e) {
url = 'the link';
var dataToBeSent = $("form#myForm").serialize();
$.ajax({
url : url,
data : dataToBeSent,
success : function(response) {
alert('Success');
},
error : function(request, textStatus, errorThrown) {
alert('Something bad happened');
}
});
e.preventDefault();
});
In the other page I get the variables and process them. My form is
<form name = "myForm" method = "post">//AJAX does the calling part so action is not needed.
<input type = "text" name = "fname"/>
<input type= "submit" name = "submit"/>
<FORM>
In the action page have something like this
name = Request.QueryString("fname")
UPDATE: As one of your comment in David's post, you are not sure how to send values of the form. Try the below function you will get a clear idea how this code works. serialize() method does the trick.
$('input[name=submit]').click(function(e){
var dataToBeSent = $("form#myForm").serialize();
alert(dataToBeSent);
e.preventDefault();
})
I would like to upload a file and form data with Jquery. My html;
<form id="kayit" action="" method="post" enctype="multipart/form-data">
<input type="text" name="yazi" />
<input type="file" id="resim" name="resim"/>
<a onclick="kontrolet();" id="yolla">Yolla</a>
</form>
<div id="sonuc"></div>
and my js;
function kontrolet()
{
var veriler = jQuery("#kayit").serialize();
//console.log(veriler);
jQuery.ajax({
type:'POST',
url:'form.php',
data: veriler,
processData: false,
beforeSend: function () {
jQuery("#sonuc").html("Lütfen Bekleyin....");
},
success: function(sonuc)
{
jQuery('#sonuc').html(sonuc);
}
});
}
I have get filename, but this not working. Help ?
You cant upload a file through ajax using simple javascript (one of the reasons is that javascript cannot access the file system at the moment, so it cannot read content to send it on an AJAX request).
For that kind of feature you have to use some plugin that uses action script or java. There are many available online (search ajax file upload), but in my opinion you are better off using an old fashioned POST.
I've used jQuery to upload file in the background using the AjaxUpload plugin - it builds an iFrame in the background, clones your form and submits the clone to that.
As below, I am using a 'Form' and 'AJAX' to post the content of a text area to a URL within my site. I see the POST does work and posts the conetn to the server and on success I have tried to find the element on the page to append it, though it is not working.
Can you please advise?. The function success part of the call should be where I specificy the destination, though how do I append this data, put some ajax in the destination page html, on load etc?
<form id="test" onclick="submitForm();">{% csrf_token %}
<textarea id="red_content" name="content"></textarea>
<p>
<input type="submit" value="Publish" name="send">
</p>
</form>
function submitForm()
{
$.ajax({
url: "http://127.0.0.1:8000/Test/Trial",
data: $('#test'),
type: 'POST',
dataType: 'html',
success: function(data)
{
//$('.content-container5').setFocus();
$('.content-container5').html(data);
}
});
Many Thanks,
Tom
I'm not very familiar with submitting a single field via ajax (or in your case jQuery's ajax function). I did however have to do a similar function in a project I recently had.
I found this plugin:
jQuery Ajax Form Submit
It seemed to work really well. You may want to look into this for your project as well. In this case, instead of submitting your one field, the form will be submitted. This may be easier since you won't have to map the fields yourself. You can post the form to the same page and process it or post it to a given url.
Hope this helps.
I am using this version of jQuery form plugin https://raw.github.com/malsup/form/master/jquery.form.js
getting an error on submit:
error on line form.submit();
SCRIPT87: Invalid argument. jquery.form.js, line 347 character 5
My code:
<form id="ajaxUploadForm" action="#Url.Action("Upload", "Home")%>" method="post" enctype="multipart/form-data" >
<fieldset>
<legend>Upload a file</legend>
<label>File to Upload: <input type="file" name="file" /></label>
<input id="ajaxUploadButton" type="submit" value="Upload" />
</fieldset>
</form>
$(function () {
$("#ajaxUploadForm").ajaxForm({
iframe: true,
dataType: "json",
beforeSubmit: function () {
// $("#ajaxUploadForm").block({ message: '<img src="/Content/themes/start/images/progress.gif" />' });
},
success: function (result) {
// $("#ajaxUploadForm").unblock();
//$("#ajaxUploadForm").resetForm();
$.growlUI(null, result.message);
},
error: function (xhr, textStatus, errorThrown) {
//$("#ajaxUploadForm").unblock();
//$("#ajaxUploadForm").resetForm();
$.growlUI(null, 'Error uploading file');
}
});
});
I am doing this upload in side simple model dialog.
May be some one may have any ideas how ti fix that?
If the controller action that you are POSTing to is returning JSON you might need to wrap it in a <textarea> tags as explained in the documentation:
Since it is not possible to upload
files using the browser's
XMLHttpRequest object, the Form Plugin
uses a hidden iframe element to help
with the task. This is a common
technique, but it has inherent
limitations. The iframe element is
used as the target of the form's
submit operation which means that the
server response is written to the
iframe. This is fine if the response
type is HTML or XML, but doesn't work
as well if the response type is script
or JSON, both of which often contain
characters that need to be repesented
using entity references when found in
HTML markup.
To account for the challenges of
script and JSON responses, the Form
Plugin allows these responses to be
embedded in a textarea element and it
is recommended that you do so for
these response types when used in
conjuction with file uploads. Please
note, however, that if there is no
file input in the form then the
request uses normal XHR to submit the
form (not an iframe). This puts the
burden on your server code to know
when to use a textarea and when not
to. If you like, you can use the
iframe option of the plugin to force
it to always use an iframe mode and
then your server can always embed the
response in a textarea.