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/home/develito/httpdocs/libraries/syw/fields/sywimagefilepreview.php

<?php
/**
 * @copyright	Copyright (C) 2011 Simplify Your Web, Inc. All rights reserved.
 * @license		GNU General Public License version 3 or later; see LICENSE.txt
 */

// no direct access
defined('_JEXEC') or die ;

jimport('joomla.filesystem.file');
jimport('joomla.form.formfield');

/**
 *
 * @author Olivier Buisard
 *
 * field parameters
 *
 * accept: allowed extensions - defaults to .gif,.jpg,.png
 * size
 * maxlength
 * class
 * disabled
 * onchange
 * showpreview: show the file preview - defaults to false
 * width: the preview max width - defaults to 200
 * height: the preview max width
 * showname: show the file name - defaults to false
 *
 */
class JFormFieldSYWImageFilePreview extends JFormField
{
    public $type = 'SYWImageFilePreview';

protected $width;
    protected $height;
    protected $show_name;
    protected $show_preview;
    protected $clear;

protected function getInput()
    {
        $html = '';

$lang = JFactory::getLanguage();
        $lang->load('lib_syw.sys', JPATH_SITE);

if ($this->show_preview) {
        	JFactory::getDocument()->addScriptDeclaration('
				document.addEventListener("readystatechange", function(event) {
					if (event.target.readyState == "complete") {
						document.getElementById("' . $this->id . '_file").addEventListener("change", on' . $this->id . 'FileSelected, false);
						function on' . $this->id . 'FileSelected (input) {
							if (input.target.files[0]) {
								file = input.target.files[0];
								file_path = (window.URL || window.webkitURL).createObjectURL(file);
								let reader = new FileReader();
								reader.readAsDataURL(file);
								reader.onloadend = function(evt) {
									if (evt.target.readyState == FileReader.DONE) {
										let image_preview = document.querySelector("#' . $this->id . '_preview img");
										if (image_preview != null) {
											image_preview.setAttribute("src", file_path);
											document.getElementById("' . $this->id . '_preview").querySelector(".image_preview").style.display = "block";
											document.getElementById("' . $this->id . '_preview").querySelector(".no_preview").style.display = "none";
											let filename = document.querySelector("#' . $this->id . '_preview .file_name");
											if (filename != null) {
												filename.textContent = file.name;
											}
										}
									}
								}
							}
						}
					}
				});
			');
        } else {
        	JFactory::getDocument()->addScriptDeclaration('
        		document.addEventListener("readystatechange", function(event) {
					if (event.target.readyState == "complete") {
						document.getElementById("' . $this->id . '_file").addEventListener("change", on' . $this->id . 'FileSelected, false);
						function on' . $this->id . 'FileSelected (input) {
							if (input.target.files[0]) {
								file = input.target.files[0];
								file_path = (window.URL || window.webkitURL).createObjectURL(file);
								let reader = new FileReader();
								reader.readAsDataURL(file);
								reader.onloadend = function(evt) {
									if (evt.target.readyState == FileReader.DONE) {
										document.getElementById("' . $this->id . '_filename").value = file.name;
									}
								}
							}
						}
					}
				});
			');
        }

// Initialize some field attributes.
        $accept = $this->element['accept'] ? ' accept="' . (string) $this->element['accept'] . '"' : ' accept=".gif,.jpg,.png"';
        $size = $this->element['size'] ? ' size="' . (int) $this->element['size'] . '"' : '';
        $maxLength = $this->element['maxlength'] ? ' maxlength="' . (int) $this->element['maxlength'] . '"' : '';
        $class = $this->element['class'] ? ' class="' . (string) $this->element['class'] . '"' : '';
        $disabled = ((string) $this->element['disabled'] == 'true') ? ' disabled="disabled"' : '';

$onchange = $this->element['onchange'] ? ' onchange="' . (string) $this->element['onchange'] . '"' : '';

$html .= '<input type="file" name="' . $this->getName($this->fieldname . '_file') . '" id="' . $this->id . '_file"' . $accept . $disabled . $class . $size . $maxLength . $onchange . ' />';
        $html .= '<input type="hidden" name="' . $this->name . '" id="' . $this->id . '"' . ' value="'. htmlspecialchars($this->value, ENT_COMPAT, 'UTF-8') .'" />';

$path = htmlspecialchars($this->value, ENT_COMPAT, 'UTF-8');

if ($this->show_preview) {

$style = '';

$style .= 'max-width: '.$this->width.'px;';

if (!empty($this->height)) {
                $style .= 'max-height: '.$this->height.'px;';
            }

$html .= '<div id="'.$this->id.'_preview" style="'.$style.' overflow: auto; border: 1px solid #ccc; border-radius: 3px; padding: 10px; margin-top: 5px; text-align: center">';

$html .= '<div class="image_preview" style="display: ' . (empty($path) ? 'none' : 'block') . '">';

$parts = explode('/', $path);

$html .= '<img src="'.JURI::root().$path.'" alt="'.end($parts).'" style="max-width: 100%">';

if ($this->show_name) {
				$html .= '<br /><br /><span class="file_name">'.end($parts).'</span>';
			}

// clear button
			if ($this->clear) {

$onclick = 'jQuery(\'#' . $this->id . '_preview\').find(\'.image_preview\').hide();';
				$onclick .= 'jQuery(\'#' . $this->id . '\').val(\'\');';
				$onclick .= 'jQuery(\'#' . $this->id . '_file\').val(\'\');';
				$onclick .= 'jQuery(\'#' . $this->id . '_preview\').find(\'.no_preview\').show();';
				$onclick .= 'return false;';

$html .= '<br /><br /><button onclick="' . $onclick . '" class="btn btn-small btn-danger">' . JText::_('JACTION_DELETE') . '</button>';
			}

$html .= '</div>';

$html .= '<div class="no_preview" style="display: ' . (empty($path) ? 'block' : 'none') . '">';
				$html .= '<span>'.JText::_('LIB_SYW_IMAGEPREVIEW_NOPREVIEW').'</span>';
			$html .= '</div>';

$html .= '</div>';
        } else {
			$html .= '<br /><br />';

$parts = explode('/', $path);

if ($this->clear) {
				$html .= '<div class="input-append">';
			}

$html .= '<input id="'.$this->id.'_filename" type="text" disabled="disabled" value="'.end($parts).'" />';

if ($this->clear) {

$onclick = 'jQuery(\'#' . $this->id . '_filename\').val(\'\');';
				$onclick .= 'jQuery(\'#' . $this->id . '\').val(\'\');';
				$onclick .= 'jQuery(\'#' . $this->id . '_file\').val(\'\');';
				$onclick .= 'return false;';

$html .= '<button onclick="' . $onclick . '" class="btn btn-danger">' . JText::_('JACTION_DELETE') . '</button>';

$html .= '</div>';
			}
        }

return $html;
    }

public function setup(SimpleXMLElement $element, $value, $group = null)
    {
        $return = parent::setup($element, $value, $group);

if ($return) {
        	$this->width = isset($this->element['width']) ? trim((string)$this->element['width']) : '200';
        	$this->height = isset($this->element['height']) ? trim((string)$this->element['height']) : '';
            $this->show_name = isset($this->element['showname']) ? filter_var($this->element['showname'], FILTER_VALIDATE_BOOLEAN) : false;
            $this->show_preview = isset($this->element['showpreview']) ? filter_var($this->element['showpreview'], FILTER_VALIDATE_BOOLEAN) : false;
            $this->clear = isset($this->element['clear']) ? filter_var($this->element['clear'], FILTER_VALIDATE_BOOLEAN) : true;
        }

return $return;
    }

}