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rex::removeProperty('tabs');

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"ErrorException" thrown in rex:///module/7/output on line 10
Fatal error: Call to a member function append() on null

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<!-- *******************************************************
TABS EINGABE
******************************************************** -->

<fieldset class="form-horizontal">
    <legend>Tabs Eingabe</legend>

    <div class="form-group">
        <label class="col-sm-2 control-label" for="headline">Icon</label>
        REX_MEDIA[id="1" widget="1"]
    </div>
    <div class="form-group">
        <label class="col-sm-2 control-label" for="headline">Überschrift</label>
        <div class="col-sm-10">
            <input class="form-control" id="headline" type="text" name="REX_INPUT_VALUE[2]" value="REX_VALUE[2]" />
        </div>
    </div>

    <div class="form-group">
        <label class="col-sm-2 control-label" for="markitup_textile_">Text</label>
        <div class="col-sm-10">
            <textarea cols="1" rows="6" class="form-control markitupEditor-textile_full" id="markitup_textile_1" name="REX_INPUT_VALUE[1]">REX_VALUE[1]</textarea>
        </div>
    </div>

</fieldset>

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<?php
if (!isset($counter)) {
	$counter = 0;
}
$counter++;
// Write data in an array for Frontend, but do not show them
if (! rex::isBackend()) {
	$items = array();
	$items = ['title' => '<img style="width:50px;border-radius:10px;margin-right:15px;" src="/media/REX_MEDIA[1]" /> <h5 style="display:inline-block;">REX_VALUE[2]</h5>', 'text' => 'REX_VALUE[id=1 output=html]'];
	rex::getProperty('tabs')->append($items);
// Im Backend wird der Inhalt als Info für den Redakteur angezeigt
} else {
	if ('REX_VALUE[id=2 isset=1]') {
	    echo '<h2>REX_VALUE[2]</h2>';
	}
	if ('REX_VALUE[id=1 isset=1]') {
	    echo '<p>REX_VALUE[1]</p>';
	}
}
?>

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<!-- *******************************************************
TABS AUSGABE
******************************************************** -->

<fieldset class="form-horizontal">
    <div class="form-group">
        <label class="col-sm-2 control-label" for="headline">Überschrift</label>
        <div class="col-sm-10">
            <input class="form-control" id="headline" type="text" name="REX_INPUT_VALUE[2]" value="REX_VALUE[2]" />
        </div>
    </div>

    <div class="form-group">
        <label class="col-sm-2 control-label" for="headline-level">Tab-Stil</label>
        <div class="col-sm-10">
			<?php
				$options = array(
				'ba'=>'Button-Akkordeons',
				'ta'=>'Text-Akkordeons',
				'bt'=>'Button-Tabs',
				'vt' => 'Vertikale Tabs',
				'tt' => 'Text-Tabs'
			);
			?>
			<select name="REX_INPUT_VALUE[1]" id="headline-level" class="form-control">
			<?php foreach ($options as $k=>$v) : ?>
			<option value="<?php echo $k; ?>"<?php if ($k == "REX_VALUE[1]") echo ' selected="selected"' ?>><?php echo $v; ?></option>
			<?php endforeach ?>
			</select>
        </div>
    </div>

	<!--
	<div class="form-group">
        <label class="col-sm-2 control-label" for="headline-level">falls Akkordeon</label>
        <div class="col-sm-10">
			<?php
				$options = array(
				'one-open'=>'Akkordeon schließt anderes',
				'multi-open'=>'mehrere Akkordions offen'
			);
			?>
			<select name="REX_INPUT_VALUE[3]" id="headline-level" class="form-control">
			<?php foreach ($options as $k=>$v) : ?>
			<option value="<?php echo $k; ?>"<?php if ($k == "REX_VALUE[3]") echo ' selected="selected"' ?>><?php echo $v; ?></option>
			<?php endforeach ?>
			</select>
        </div>
    </div>
	-->
</fieldset>

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<?php

$items = '';
$item = '';
// In frontend read array
if (!rex::isBackend()) {
	$items = rex::getProperty('tabs')->getArrayCopy();

	$textile = '';
	$tabs_title = '';
	$tabs_text = '';
	$tabs_out = '';
	$counter = 1;

	$title_style = 'title';
	$content_style = 'content';
	if ("REX_VALUE[1]" == 'tt' || "REX_VALUE[1]" == 'vt' || "REX_VALUE[1]" == 'bt') {
		$title_style = 'tab-title';
		$content_style = 'tab-content';
	}
	$one_open = ("REX_VALUE[3]" == 'one-open') ? " one-open" : "";

	foreach ($items as $item) {

		if (! isset($item['title'])) { $item['title'] = ''; };
		if (! isset($item['text'])) { $item['text'] = ''; };

		$active_title = '';
		$active_text = '';

		$tabs_title = $item['title'];
		$tabs_text = $item['text'];

		if ($tabs_title != '' && $tabs_text != '') {
			if ($counter == 1) $active_title = ' class="active"';

			$textile = markitup::parseOutput('textile', $tabs_text);
			$textile = str_replace(array('<b>', '</b>', '-&gt;'), array('<span class="label label-primary">', '</span>', '->'), $textile);

			$tabs_out .= '
			<li'.$active_title.'>
				<div class="'.$title_style.'">
					<span>'.$tabs_title.'</span>
				</div>
				<div class="'.$content_style.' text">'.$textile.'</div>
			</li>';
		}

		$counter++;

	}
	?>

	<section class="<?php if ($this->getTemplateId() == 1) echo 'container clearfix '; ?>tabs">
			<div class="row">
				<div class="col-md-12">

					<?php
					if ("REX_VALUE[2]" != '') {
						echo '
						<h3>REX_VALUE[2]</h3>';
					}

					if ("REX_VALUE[1]" == 'tt') { // Text-Tabs
						echo '
						<div class="tabbed-content text-tabs">';

					} elseif ("REX_VALUE[1]" == 'vt') { // Vertikale Tabs
						echo '
						<div class="tabbed-content button-tabs vertical">';

					} elseif ("REX_VALUE[1]" == 'bt') { // Button-Tabs
						echo '
						<div class="tabbed-content button-tabs">';
					}

					if ("REX_VALUE[1]" == 'ta') { // Text-Accordions

						echo '
						<ul class="accordion accordion-2'.$one_open.'">'.
							$tabs_out.'
						</ul>';

					} elseif ("REX_VALUE[1]" == 'ba') { // Button-Accordions

						echo '
						<ul class="accordion accordion-1'.$one_open.'">'.
							$tabs_out.'
						</ul>';

					} else {

						echo '
						<ul class="tabs">'.
							$tabs_out.'
						</ul>';

					}

					if ("REX_VALUE[1]" == 'tt' || "REX_VALUE[1]" == 'vt' || "REX_VALUE[1]" == 'bt') {
						echo '
						</div>';
					}
					?>

				</div>
			</div>
	</section>

	<?php
} else {
	echo '
	<p>Output only in frontend</p>';
}

?>

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rex::setProperty('tabs', new ArrayIterator());

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...Porperty('tabs',...)

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...Property('meine_property',...)