Upload Form

From 8ede1a2ecbb62577afd32996956c5feaf7ddf9b6 Mon Sep 17 00:00:00 2001 From: Derek Jones Date: Wed, 5 Oct 2011 13:34:52 -0500 Subject: replacing the old HTML user guide with a Sphinx-managed user guide --- user_guide_src/source/libraries/file_uploading.rst | 276 +++++++++++++++++++++ 1 file changed, 276 insertions(+) create mode 100644 user_guide_src/source/libraries/file_uploading.rst (limited to 'user_guide_src/source/libraries/file_uploading.rst') diff --git a/user_guide_src/source/libraries/file_uploading.rst b/user_guide_src/source/libraries/file_uploading.rst new file mode 100644 index 000000000..c2de59865 --- /dev/null +++ b/user_guide_src/source/libraries/file_uploading.rst @@ -0,0 +1,276 @@ +#################### +File Uploading Class +#################### + +CodeIgniter's File Uploading Class permits files to be uploaded. You can +set various preferences, restricting the type and size of the files. + +*********** +The Process +*********** + +Uploading a file involves the following general process: + +- An upload form is displayed, allowing a user to select a file and + upload it. +- When the form is submitted, the file is uploaded to the destination + you specify. +- Along the way, the file is validated to make sure it is allowed to be + uploaded based on the preferences you set. +- Once uploaded, the user will be shown a success message. + +To demonstrate this process here is brief tutorial. Afterward you'll +find reference information. + +Creating the Upload Form +======================== + +Using a text editor, create a form called upload_form.php. In it, place +this code and save it to your applications/views/ folder: + + Upload Form +

+You'll notice we are using a form helper to create the opening form tag. +File uploads require a multipart form, so the helper creates the proper +syntax for you. You'll also notice we have an $error variable. This is +so we can show error messages in the event the user does something +wrong. + +The Success Page +================ + +Using a text editor, create a form called upload_success.php. In it, +place this code and save it to your applications/views/ folder: + + Upload Form

Your file +was successfully uploaded!

+The Controller +============== + +Using a text editor, create a controller called upload.php. In it, place +this code and save it to your applications/controllers/ folder: + +load->helper(array('form', 'url')); } +function index() { $this->load->view('upload_form', array('error' => ' +' )); } function do_upload() { $config['upload_path'] = './uploads/'; +$config['allowed_types'] = 'gif\|jpg\|png'; $config['max_size'] = +'100'; $config['max_width'] = '1024'; $config['max_height'] = '768'; +$this->load->library('upload', $config); if ( ! +$this->upload->do_upload()) { $error = array('error' => +$this->upload->display_errors()); $this->load->view('upload_form', +$error); } else { $data = array('upload_data' => +$this->upload->data()); $this->load->view('upload_success', $data); } } +} ?> + +The Upload Folder +================= + +You'll need a destination folder for your uploaded images. Create a +folder at the root of your CodeIgniter installation called uploads and +set its file permissions to 777. + +Try it! +======= + +To try your form, visit your site using a URL similar to this one:: + + example.com/index.php/upload/ + +You should see an upload form. Try uploading an image file (either a +jpg, gif, or png). If the path in your controller is correct it should +work. + +*************** +Reference Guide +*************** + +Initializing the Upload Class +============================= + +Like most other classes in CodeIgniter, the Upload class is initialized +in your controller using the $this->load->library function:: + + $this->load->library('upload'); + +Once the Upload class is loaded, the object will be available using: +$this->upload + +Setting Preferences +=================== + +Similar to other libraries, you'll control what is allowed to be upload +based on your preferences. In the controller you built above you set the +following preferences:: + + $config['upload_path'] = './uploads/'; $config['allowed_types'] = 'gif|jpg|png'; $config['max_size'] = '100'; $config['max_width'] = '1024'; $config['max_height'] = '768'; $this->load->library('upload', $config); // Alternately you can set preferences by calling the initialize function. Useful if you auto-load the class: $this->upload->initialize($config); + +The above preferences should be fairly self-explanatory. Below is a +table describing all available preferences. + +Preferences +=========== + +The following preferences are available. The default value indicates +what will be used if you do not specify that preference. + +Preference +Default Value +Options +Description +**upload_path** +None +None +The path to the folder where the upload should be placed. The folder +must be writable and the path can be absolute or relative. +**allowed_types** +None +None +The mime types corresponding to the types of files you allow to be +uploaded. Usually the file extension can be used as the mime type. +Separate multiple types with a pipe. +**file_name** +None +Desired file name +If set CodeIgniter will rename the uploaded file to this name. The +extension provided in the file name must also be an allowed file type. + +**overwrite** +FALSE +TRUE/FALSE (boolean) +If set to true, if a file with the same name as the one you are +uploading exists, it will be overwritten. If set to false, a number will +be appended to the filename if another with the same name exists. +**max_size** +0 +None +The maximum size (in kilobytes) that the file can be. Set to zero for no +limit. Note: Most PHP installations have their own limit, as specified +in the php.ini file. Usually 2 MB (or 2048 KB) by default. +**max_width** +0 +None +The maximum width (in pixels) that the file can be. Set to zero for no +limit. +**max_height** +0 +None +The maximum height (in pixels) that the file can be. Set to zero for no +limit. +**max_filename** +0 +None +The maximum length that a file name can be. Set to zero for no limit. +**max_filename_increment** +100 +None +When overwrite is set to FALSE, use this to set the maximum filename +increment for CodeIgniter to append to the filename. +**encrypt_name** +FALSE +TRUE/FALSE (boolean) +If set to TRUE the file name will be converted to a random encrypted +string. This can be useful if you would like the file saved with a name +that can not be discerned by the person uploading it. +**remove_spaces** +TRUE +TRUE/FALSE (boolean) +If set to TRUE, any spaces in the file name will be converted to +underscores. This is recommended. + +Setting preferences in a config file +==================================== + +If you prefer not to set preferences using the above method, you can +instead put them into a config file. Simply create a new file called the +upload.php, add the $config array in that file. Then save the file in: +config/upload.php and it will be used automatically. You will NOT need +to use the $this->upload->initialize function if you save your +preferences in a config file. + +****************** +Function Reference +****************** + +The following functions are available + +$this->upload->do_upload() +=========================== + +Performs the upload based on the preferences you've set. Note: By +default the upload routine expects the file to come from a form field +called userfile, and the form must be a "multipart type:: + +

+ +If you would like to set your own field name simply pass its value to +the do_upload function:: + + $field_name = "some_field_name"; $this->upload->do_upload($field_name) + +$this->upload->display_errors() +================================ + +Retrieves any error messages if the do_upload() function returned +false. The function does not echo automatically, it returns the data so +you can assign it however you need. + +Formatting Errors +***************** + +By default the above function wraps any errors within

tags. You can +set your own delimiters like this:: + + $this->upload->display_errors('

', '

'); + +$this->upload->data() +===================== + +This is a helper function that returns an array containing all of the +data related to the file you uploaded. Here is the array prototype:: + + Array ( [file_name] => mypic.jpg [file_type] => image/jpeg [file_path] => /path/to/your/upload/ [full_path] => /path/to/your/upload/jpg.jpg [raw_name] => mypic [orig_name] => mypic.jpg [client_name] => mypic.jpg [file_ext] => .jpg [file_size] => 22.2 [is_image] => 1 [image_width] => 800 [image_height] => 600 [image_type] => jpeg [image_size_str] => width="800" height="200" ) + +Explanation +*********** + +Here is an explanation of the above array items. + +Item +Description +**file_name** +The name of the file that was uploaded including the file extension. +**file_type** +The file's Mime type +**file_path** +The absolute server path to the file +**full_path** +The absolute server path including the file name +**raw_name** +The file name without the extension +**orig_name** +The original file name. This is only useful if you use the encrypted +name option. +**client_name** +The file name as supplied by the client user agent, prior to any file +name preparation or incrementing. +**file_ext** +The file extension with period +**file_size** +The file size in kilobytes +**is_image** +Whether the file is an image or not. 1 = image. 0 = not. +**image_width** +Image width. +**image_height** +Image height +**image_type** +Image type. Typically the file extension without the period. +**image_size_str** +A string containing the width and height. Useful to put into an image +tag. -- cgit v1.2.3-24-g4f1b