File Uploads

Handle file uploads with automatic temporary storage, validation, and processing. CBWIRE automatically converts uploaded files into FileUpload objects with methods for accessing content, metadata, and preview URLs.

Basic Usage

Create a photo upload component with save functionality:

BoxLang

// wires/PhotoUpload.bx
class extends="cbwire.models.Component" {
    data = {
        "photo": "",
        "isUploading": false
    };
    
    function save() {
        if (data.photo != "") {
            // Save file to permanent location
            var uploadPath = expandPath("./uploads/#createUUID()#.jpg");
            fileWrite(uploadPath, data.photo.get());
            
            // Clean up temporary file
            data.photo.destroy();
            
            // Reset form
            data.photo = "";
        }
    }
}

CFML

BoxLang

<!-- wires/photoUpload.bxm -->
<bx:output>
<div>
    <h1>Upload Photo</h1>
    
    <form wire:submit.prevent="save">
        <div>
            <label for="photo">Select Photo:</label>
            <input type="file" 
                   id="photo" 
                   wire:model="photo" 
                   accept="image/*">
        </div>
        
        <!-- Loading indicator -->
        <div wire:loading wire:target="photo">
            Uploading photo...
        </div>
        
        <!-- Preview uploaded photo -->
        <bx:if photo != "" AND photo.isImage()>
            <div class="preview">
                <h3>Preview:</h3>
                <img src="#photo.getPreviewURL()#" 
                     alt="Uploaded photo" 
                     style="max-width: 200px;">
                <p>Size: #photo.getSize()# bytes</p>
            </div>
        </bx:if>
        
        <button type="submit" 
                wire:loading.attr="disabled">
            Save Photo
        </button>
    </form>
</div>
</bx:output>

CFML

How It Works

CBWIRE handles file uploads through a multi-step process:

1. Request signed URL - CBWIRE gets a temporary upload URL from the server

2. Upload file - JavaScript uploads the file to temporary storage

3. Create FileUpload object - The data property becomes a FileUpload instance

4. Process file - Use FileUpload methods to save, validate, or manipulate the file

FileUpload Methods

When a file is uploaded, CBWIRE creates a FileUpload object with the following methods:

File Content

Method	Description
get()	Returns the binary content of the uploaded file
getBase64()	Returns base64 encoded string of the file
getBase64Src()	Returns base64 data URL for use in <img> tags

File Information

Method	Description
getSize()	Returns file size in bytes
getMimeType()	Returns the MIME type of the file
getMeta()	Returns all metadata about the uploaded file
isImage()	Returns true if the file is an image

File Locations

Method	Description
getTemporaryStoragePath()	Returns the temporary file storage path
getMetaPath()	Returns path to file metadata
getPreviewURL()	Returns URL for previewing images

Cleanup

Method	Description
destroy()	Deletes temporary file and metadata (call after saving)

Loading States

Display upload progress using wire:loading directives:

<input type="file" wire:model="document">

<div wire:loading wire:target="document">
    Uploading document...
</div>

<button type="submit" wire:loading.attr="disabled">
    Save Document
</button>

Always call destroy() on FileUpload objects after saving to permanent storage to clean up temporary files.

Image previews using getPreviewURL() only work with image file types. Use isImage() to check before displaying previews.