Integrating Dropzone.js into existing HTML form with other fields
Solution 1:
Here's another way to do it: add a div in your form with a classname dropzone, and implement dropzone programmatically.
HTML :
<div id="dZUpload" class="dropzone">
<div class="dz-default dz-message"></div>
</div>
JQuery:
$(document).ready(function () {
Dropzone.autoDiscover = false;
$("#dZUpload").dropzone({
url: "hn_SimpeFileUploader.ashx",
addRemoveLinks: true,
success: function (file, response) {
var imgName = response;
file.previewElement.classList.add("dz-success");
console.log("Successfully uploaded :" + imgName);
},
error: function (file, response) {
file.previewElement.classList.add("dz-error");
}
});
});
Note : Disabling autoDiscover, otherwise Dropzone will try to attach twice
Solution 2:
I had the exact same problem and found that Varan Sinayee's answer was the only one that actually solved the original question. That answer can be simplified though, so here's a simpler version.
The steps are:
Create a normal form (don't forget the method and enctype args since this is not handled by dropzone anymore).
Put a div inside with the
class="dropzone"(that's how Dropzone attaches to it) andid="yourDropzoneName"(used to change the options).Set Dropzone's options, to set the url where the form and files will be posted, deactivate autoProcessQueue (so it only happens when user presses 'submit') and allow multiple uploads (if you need it).
Set the init function to use Dropzone instead of the default behavior when the submit button is clicked.
Still in the init function, use the "sendingmultiple" event handler to send the form data along wih the files.
Voilà ! You can now retrieve the data like you would with a normal form, in $_POST and $_FILES (in the example this would happen in upload.php)
HTML
<form action="upload.php" enctype="multipart/form-data" method="POST">
<input type="text" id ="firstname" name ="firstname" />
<input type="text" id ="lastname" name ="lastname" />
<div class="dropzone" id="myDropzone"></div>
<button type="submit" id="submit-all"> upload </button>
</form>
JS
Dropzone.options.myDropzone= {
url: 'upload.php',
autoProcessQueue: false,
uploadMultiple: true,
parallelUploads: 5,
maxFiles: 5,
maxFilesize: 1,
acceptedFiles: 'image/*',
addRemoveLinks: true,
init: function() {
dzClosure = this; // Makes sure that 'this' is understood inside the functions below.
// for Dropzone to process the queue (instead of default form behavior):
document.getElementById("submit-all").addEventListener("click", function(e) {
// Make sure that the form isn't actually being sent.
e.preventDefault();
e.stopPropagation();
dzClosure.processQueue();
});
//send all the form data along with the files:
this.on("sendingmultiple", function(data, xhr, formData) {
formData.append("firstname", jQuery("#firstname").val());
formData.append("lastname", jQuery("#lastname").val());
});
}
}
Solution 3:
The "dropzone.js" is the most common library for uploading images. If you want to have the "dropzone.js" as just part of your form, you should do the following steps:
1) for the client side:
HTML :
<form action="/" enctype="multipart/form-data" method="POST">
<input type="text" id ="Username" name ="Username" />
<div class="dropzone" id="my-dropzone" name="mainFileUploader">
<div class="fallback">
<input name="file" type="file" multiple />
</div>
</div>
</form>
<div>
<button type="submit" id="submit-all"> upload </button>
</div>
JQuery:
<script>
Dropzone.options.myDropzone = {
url: "/Account/Create",
autoProcessQueue: false,
uploadMultiple: true,
parallelUploads: 100,
maxFiles: 100,
acceptedFiles: "image/*",
init: function () {
var submitButton = document.querySelector("#submit-all");
var wrapperThis = this;
submitButton.addEventListener("click", function () {
wrapperThis.processQueue();
});
this.on("addedfile", function (file) {
// Create the remove button
var removeButton = Dropzone.createElement("<button class='btn btn-lg dark'>Remove File</button>");
// Listen to the click event
removeButton.addEventListener("click", function (e) {
// Make sure the button click doesn't submit the form:
e.preventDefault();
e.stopPropagation();
// Remove the file preview.
wrapperThis.removeFile(file);
// If you want to the delete the file on the server as well,
// you can do the AJAX request here.
});
// Add the button to the file preview element.
file.previewElement.appendChild(removeButton);
});
this.on('sendingmultiple', function (data, xhr, formData) {
formData.append("Username", $("#Username").val());
});
}
};
</script>
2) for the server side:
ASP.Net MVC
[HttpPost]
public ActionResult Create()
{
var postedUsername = Request.Form["Username"].ToString();
foreach (var imageFile in Request.Files)
{
}
return Json(new { status = true, Message = "Account created." });
}
Solution 4:
I have a more automated solution for this.
HTML:
<form role="form" enctype="multipart/form-data" action="{{ $url }}" method="{{ $method }}">
{{ csrf_field() }}
<!-- You can add extra form fields here -->
<input hidden id="file" name="file"/>
<!-- You can add extra form fields here -->
<div class="dropzone dropzone-file-area" id="fileUpload">
<div class="dz-default dz-message">
<h3 class="sbold">Drop files here to upload</h3>
<span>You can also click to open file browser</span>
</div>
</div>
<!-- You can add extra form fields here -->
<button type="submit">Submit</button>
</form>
JavaScript:
Dropzone.options.fileUpload = {
url: 'blackHole.php',
addRemoveLinks: true,
accept: function(file) {
let fileReader = new FileReader();
fileReader.readAsDataURL(file);
fileReader.onloadend = function() {
let content = fileReader.result;
$('#file').val(content);
file.previewElement.classList.add("dz-success");
}
file.previewElement.classList.add("dz-complete");
}
}
Laravel:
// Get file content
$file = base64_decode(request('file'));
No need to disable DropZone Discovery and the normal form submit will be able to send the file with any other form fields through standard form serialization.
This mechanism stores the file contents as base64 string in the hidden input field when it gets processed. You can decode it back to binary string in PHP through the standard base64_decode() method.
I don't know whether this method will get compromised with large files but it works with ~40MB files.