Dynamically Render MODX's Template Variable on front-end to get Text and Value

getTVText.php

<?php

/**
 * getTVText snippet
 *
 * Dynamically Render Template Variable on front-end to get not only the value,
 * but also its input's "text"
 *
 * @author      goldsky <goldsky@virtudraft.com>
 *
 * @license https://opensource.org/licenses/MIT The MIT License (MIT)
 * @copyright   2016 goldsky <goldsky@virtudraft.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 * @example snippet's call:
 *
 * [[!getTVText?
 * &resId=`[[*id]]`
 * &tvName=`tags`
 * &tpl=`tag`
 * &tvDelimiter=`||`
 * &outputDelimiter=`<br>`
 * ]]
 *
 * @example tpl chunk:
 * <a href="[[~[[+parent]]? &tag=`[[+value]]`]]">[[+text]]</a>
 *
 * @return placeholders:
 * - text
 * - value
 * - id     // resource's ID
 * - parent // parent resource's ID
 */

/**
 * @var         &resId
 * @type        comma seperated integers
 * @description resource's ID
 * @default     current resource's ID
 */
$resId = $modx->getOption('resId', $scriptProperties, $modx->resource->get('id'));
/**
 * @var         &parents
 * @type        comma seperated integers
 * @description parents' IDs
 * @default     null
 */
$parents = $modx->getOption('parents', $scriptProperties);
/**
 * @var         &tvName
 * @type        string/int
 * @description tv's Name or ID
 * @default     null
 */
$tvName = $modx->getOption('tvName', $scriptProperties);
/**
 * @var         &tpl
 * @type        string
 * @description chunk's Name to render the output. If not provided, raw values will return.
 * @default     null
 */
$tpl = $modx->getOption('tpl', $scriptProperties);
/**
 * @var         &tvDelimiter
 * @type        string
 * @description delimiter of multiple values
 * @default     ||
 */
$tvDelimiter = $modx->getOption('tvDelimiter', $scriptProperties, '||');
/**
 * @var         &outputDelimiter
 * @type        string
 * @description delimiter of multiple outputs
 * @default     \n
 */
$outputDelimiter = $modx->getOption('outputDelimiter', $scriptProperties, "\n");
/**
 * @var         &toPlaceholder
 * @type        string
 * @description returns the value to the given placeholder instead
 * @default     null
 */
$toPlaceholder = $modx->getOption('toPlaceholder', $scriptProperties);

if ((empty($resId) && empty($parents)) || empty($tvName)) {
    return;
}
$resources = array();
if ($resId) {
    $resId = @explode(',', $resId);
    $resources = $modx->getCollection('modResource', array(
        'id:IN' => $resId
    ));
}
if ($parents) {
    $parents = @explode(',', $parents);
    $parentResources = $modx->getCollection('modResource', array(
        'id:IN' => $parents
    ));
    foreach ($parentResources as $parentResource) {
        $children = $parentResource->getMany('Children');
        if ($children) {
            foreach ($children as $child) {
                $resources[] = $child;
            }
        }
    }
}
if (empty($resources)) {
    $modx->log(modX::LOG_LEVEL_ERROR, '[getTVText] : $resources is empty');
    return;
}
$tv = $modx->getObject('modTemplateVar', array(
    'name' => $tvName
        ));
if (empty($tv)) {
    return;
}
$outputArray = array();
foreach ($resources as $resource) {
    $tvValue = $resource->getTVValue($tvName);
    $inputOptions = $tv->parseInputOptions($tv->processBindings($tv->get('elements'), $resource->get('id')));
    $tvOptions = array();
    foreach ($inputOptions as $v) {
        $exp = @explode('==', $v);
        $text = isset($exp[1]) ? $exp[0] : $exp[0];
        $val = isset($exp[1]) ? $exp[1] : $exp[0];
        $tvOptions[$val] = $text;
    }
    $values = array_map('trim', @explode($tvDelimiter, $tvValue));
    foreach ($values as $value) {
        if (empty($value)) {
            continue;
        }
        if (isset($outputArray[$value])) {
            continue;
        }
        if (!empty($tpl)) {
            $outputArray[$value] = $modx->getChunk($tpl, array(
                'text' => (isset($tvOptions[$value]) ? $tvOptions[$value] : $value),
                'value' => $value,
                'id' => $resId,                         // resource's ID
                'parent' => $resource->get('parent')    // resource's ID
            ));
        } else {
            $outputArray[$value] = $value;
        }
    }
}
$output = @implode($outputDelimiter, $outputArray);

if (!empty($toPlaceholder)) {
    $modx->setPlaceholder($toPlaceholder, $output);
    return;
}
return $output;