Laden Sie mehrere Bilddateien in CodeIgniter mit Ajax und PHP hoch

Question

Ich habe Probleme beim Hochladen mehrerer Bilddateien auf den Server. Es wäre großartig, wenn jemand hervorheben könnte, was mit dem Code nicht stimmt.

Zunächst gibt es HTML-Code:

<label class="col-form-label"><h4>Upload Images</h4></label>
              <div id="image-preview-container">
                <!-- Preview images will be displayed here -->
              </div>
              <form id="uploadCert" enctype="multipart/form-data">
                <input type="file" id="images" name="images" multiple="multiple" accept="image/*" style="display: none;">
                <label for="images" class="btn btn-primary"> Add Image </label>
              </form>
            </div>

Definiert in JavaScript

var selectedImages = []; //list of files in array

und erfassen Sie jede ausgewählte Datei

$("#images").change(function () {
  var file = this.files[0];

  if (file) {
    ...

    // Append the container to the image preview container
    $("#image-preview-container").append(imageContainer);

    ..

    // Add the selected image file to the postData.images array
    selectedImages.push(file);
    
    $(this).val("");
  }
});

Verwenden Sie AJAX nach der Übermittlung

$('#addcart').click(function () {

        // Add other form fields to formData
        var formData = new FormData();
        ...
        formData.append("issuesBody", $("#fbody_").val());
        ...
        
        if (selectedImages.length > 0) {
            // Append each selected image to formData
            for (var i = 0; i < selectedImages.length; i++) {
                var image = selectedImages[i];
                if (image instanceof File) {
                  // If it's a File object, append it to formData
                  formData.append("images[]", image);

                }
            }
        } else {
            // If no selected images, set images[] to an empty array
            formData.append("images[]", []);
        }

        // Make the AJAX request
        event.preventDefault();
        $.ajax({
            url: "addcert",
            type: "POST",
            data: formData,
            dataType:"json",
            contentType:false,
            cache:false,
            processData: false,
            success: function(data){
                // Handle a successful response
                ...
            },
            error: function (xhr, status, error) {
                // Handle an error response
                ...
            }
        });

     });


});

In PHP

private function addNewCert(){
        // Capture POST data
        $issuesBody = $this->input->post('issuesBody'); 
        // Not sure if this is the way to capture the posted file data
        $images = $_FILES['images']; 

        // Upload images to the server
        $uploadedFiles = $this->uploadimg($images);

        //Check if image uploads were successful
        if ($uploadedFiles === false) {
            // Handle the case where image uploads failed
            ...
            echo json_encode($output);
            return;
        } ...

Wird schließlich immer während uploadimg() angezeigt 'undefined' und der Code hier

private function uploadimg($images) {
        $uploadedFiles = array(); // captured uploaded file name

        // Loop through each uploaded file
        for ($i = 0; $i < count($images['name']); $i++) {
            // Generate a unique file name or use the original name
            $originalFileName = $images['name'][$i];
            $fileExtension = pathinfo($originalFileName, PATHINFO_EXTENSION);
            $file_name = uniqid() . '_' . $originalFileName;

            $config['upload_path'] = $this->uploadPath;
            $config['file_name'] = $file_name;
            $config['allowed_types'] = 'jpg|jpeg|png|gif'; 
            $config['max_size'] = 2048; 
            $config['encrypt_name'] = TRUE; 

            $this->load->library('upload', $config);

            // Perform the upload
            if ($this->upload->do_upload('images')) {
                $uploadedFiles[] = $file_name;
            } else {
                // Handle the case where an upload failed
                return false;
            }
        }

        return $uploadedFiles;
    }

Answer 1

实际上，代码中存在不止一个问题。首先，您应该将 $this->load->library('upload',$config) 语句从 for 循环中取出。您需要从列表中的每个文件创建单个文件才能上传。如果我没有记错的话，Codeigniter do_upload 方法不适用于多个文件。您可以更新您的 uploadimg 方法，如下所示：

private function uploadimg($images) {
    $uploadedFiles = array(); // captured uploaded file name

    $config = [
        'upload_path' => './testUploads/',
        'allowed_types' => 'jpg|jpeg|png|gif',
        'max_size' => 2048,
        'encrypt_name' => TRUE,
    ];
    $this->load->library('upload', $config);

    // Loop through each uploaded file
    for ($i = 0; $i < count($images['name']); $i++) {
        // Generate a unique file name or use the original name
        $originalFileName = $images['name'][$i];
        $fileExtension = pathinfo($originalFileName, PATHINFO_EXTENSION);
        $file_name = uniqid() . '_' . $originalFileName;

        $config['file_name'] = $file_name;
        $this->upload->initialize($config);

        $_FILES['singleImage']['name']     = $file_name;
        $_FILES['singleImage']['type']     = $images['type'][$i];
        $_FILES['singleImage']['tmp_name'] = $images['tmp_name'][$i];
        $_FILES['singleImage']['error']    = $images['error'][$i];
        $_FILES['singleImage']['size']     = $images['size'][$i];
        

        // Perform the upload
        if ($this->upload->do_upload('singleImage')) {
            $uploadedFiles[] = $file_name;
        } else {
            // Handle the case where an upload failed
            return false;
        }
    }

    return $uploadedFiles;
}

P.S 我明白了，您正在生成一个更易读的文件名。如果您想查找具有该命名结构的文件，则应将配置数组中的 encrypt_name 字段设置为 false。