Tips for retrieving the index within the upload file list on DropzoneJS

I have been experimenting with dropzoneJS and I am looking for a way to retrieve the index of a specific file in the list. This is because I need to remove an element from an array that is associated with the file I uploaded.

To do this, I created an array named uploadedImages.

var uploadedImages = []; //I managed to save the image array from the database somehow

My goal is to add the file names to the uploadedImages array when the addedfile function is triggered.

myDropzone.on("addedfile", function(file) {
    uploadedImages.push(file.name);

});

Then, when a file is removed, I want to filter out the images from the uploadedImages array. However, I initially used the file.name from Dropzone to do this. What if I have multiple images with the same name or I accidentally upload the same file more than once? I believe it would be more efficient to find the index instead.

myDropzone.on("removedfile", function(file) {
 var filterUpload = uploadedImages.filter(function(img_file){
     return img_file != file.name;
  });
  uploadedImages = filterUpload;
});

If you have any suggestions, please feel free to share. Thank you in advance!

Answer №1

Managing Images

Once the image has been validated and uploaded on the server side, it is essential to store all relevant image information in the database. The next step involves retrieving the image ID (which is typically the last inserted ID in the DB table) and saving it in the $_SESSION array:

$_SESSION["uploadedImages"][$imageID] = fileName;

Concluding the PHP code, a json response containing the File ID should be generated:

$out = array("fileID"=>$imageID);
echo json_encode($out);

Handling Images on Client Side

The file ID obtained can be utilized in the Dropzone callback and stored within the File object in this manner:

dropZone.on("success", function(file, response){
    obj = JSON.parse(response);
    //Retain the file ID received from the server:
    file.id = obj.fileID;
});

Subsequently, when removing a file, the stored file ID is forwarded to the server:

dropZone.on("removedfile", function(file){
     //Remove the uploaded file from the server:
     var imageID = file.id;
     $.post("upload.php","deleteImage="+imageID, function(data){    
          alert("File removed successfully");
     });
});

Following this, simply navigate to upload.php to utilize the ID for deleting the image from both the database and the $_SESSION array.

Answer №2

To effectively manage files, it is recommended to create a variable that stores the files and retrieve the index in the removedfile callback as shown below:

success: function(file, response) {
            uploadedFiles.push(file);
        },
        removedfile: function(file) {
            var index = uploadedFiles.map(function(item, i) {
                if(item == file) return i;
            }).filter(Number.isFinite)[0];

            var _ref;
            return (_ref = file.previewElement) != null ? _ref.parentNode.removeChild(file.previewElement) : void 0; 
        }

Answer №3

Your question is partially addressed here, as this code snippet retrieves the index from the array of files currently in Dropzone.

myDropzone.on("removedfile", function(file) {    
    // Obtain the index of the dropzone file
    var index = myDropzone.files.map(function (obj, index) {
        if (file == obj) {
            return index;
        }
    }).filter(isFinite)[0];
});

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