class.dynamic_forms.php

    function isEnabled() {
        return $this->hasStatus(self::ENABLED);
    }

    function enable() {
        $this->setStatus(self::ENABLED);
    }
    function disable() {
        $this->clearStatus(self::ENABLED);
    }

    function getConfiguration() {
        if (!$this->_config) {
            $this->_config = $this->get('properties');
            if (is_string($this->_config))
                $this->_config = JsonDataParser::parse($this->_config);
            elseif (!$this->_config)
                $this->_config = array();
        }
        return $this->_config;
    }

    function setConfiguration(&$errors=array()) {
        $config = array();
        foreach ($this->getConfigurationForm()->getFields() as $field) {
            $val = $field->to_database($field->getClean());
            $config[$field->get('id')] = is_array($val) ? $val[1] : $val;
            $errors = array_merge($errors, $field->errors());
        }
        if (count($errors) === 0)
            $this->set('properties', JsonDataEncoder::encode($config));

        return count($errors) === 0;
    }

    function getConfigurationForm() {
        if (!$this->_form) {
            $this->_form = DynamicForm::lookup(
                array('type'=>'L'.$this->get('list_id')));
        }
        return $this->_form;
    }

    function getVar($name) {
        $config = $this->getConfiguration();
        $name = mb_strtolower($name);
        foreach ($this->getConfigurationForm()->getFields() as $field) {
            if (mb_strtolower($field->get('name')) == $name)
                return $config[$field->get('id')];
        }
    }

    function toString() {
        return $this->get('value');
    }

    function __toString() {
        return $this->toString();
    }

    function delete() {
        # Don't really delete, just unset the list_id to un-associate it with
        # the list
        $this->set('list_id', null);
        return $this->save();
    }
}

class SelectionField extends FormField {
    static $widget = 'SelectionWidget';

    function getListId() {
        list(,$list_id) = explode('-', $this->get('type'));
        return $list_id;
    }

    function getList() {
        if (!$this->_list)
            $this->_list = DynamicList::lookup($this->getListId());
        return $this->_list;
    }

    function parse($value) {
        $config = $this->getConfiguration();
        if (is_int($value))
            return $this->to_php($this->getWidget()->getEnteredValue(), (int) $value);
        elseif (!$config['typeahead'])
            return $this->to_php(null, (int) $value);
        else
            return $this->to_php($value);
    }

    function to_php($value, $id=false) {
        if ($id && is_int($id))
            $item = DynamicListItem::lookup($id);
        # Attempt item lookup by name too
        if (!$item || ($value !== null && $value != $item->get('value'))) {
            $item = DynamicListItem::lookup(array(
                'value'=>$value,
                'list_id'=>$this->getListId()));
        }
        return ($item) ? $item : $value;
    }

    function hasIdValue() {
        return true;
    }

    function to_database($item) {
        if ($item instanceof DynamicListItem)
            return array($item->value, $item->id);
        return null;
    }

    function toString($item) {
        return ($item instanceof DynamicListItem)
            ? $item->toString() : (string) $item;
    }

    function validateEntry($item) {
        $config = $this->getConfiguration();
        parent::validateEntry($item);
        if ($item && !$item instanceof DynamicListItem)
            $this->_errors[] = 'Select a value from the list';
        elseif ($item && $config['typeahead']
                && $this->getWidget()->getEnteredValue() != $item->get('value'))
            $this->_errors[] = 'Select a value from the list';
    }

    function getConfigurationOptions() {
        return array(
            'typeahead' => new ChoiceField(array(
                'id'=>1, 'label'=>'Widget', 'required'=>false,
                'default'=>false,
                'choices'=>array(false=>'Drop Down', true=>'Typeahead'),
                'hint'=>'Typeahead will work better for large lists'
            )),
            'prompt' => new TextboxField(array(
                'id'=>2, 'label'=>'Prompt', 'required'=>false, 'default'=>'',
                'hint'=>'Leading text shown before a value is selected',
                'configuration'=>array('size'=>40, 'length'=>40),
            )),
        );
    }

    function getChoices() {
        if (!$this->_choices) {
            $this->_choices = array();
            foreach ($this->getList()->getItems() as $i)
                $this->_choices[$i->get('id')] = $i->get('value');
            if ($this->value && !isset($this->_choices[$this->value])) {
                $v = DynamicListItem::lookup($this->value);
                $this->_choices[$v->get('id')] = $v->get('value').' (Disabled)';
            }
        }
        return $this->_choices;
    }

    function export($value) {
        if ($value && is_numeric($value)
                && ($item = DynamicListItem::lookup($value)))
            return $item->toString();
        return $value;
    }
}

class SelectionWidget extends ChoicesWidget {
    function render($mode=false) {
        $config = $this->field->getConfiguration();
        $value = false;
        if ($this->value instanceof DynamicListItem) {
            // Loaded from database
            $value = $this->value->get('id');
            $name = $this->value->get('value');
        } elseif ($this->value) {
            // Loaded from POST
            $value = $this->value;
            $name = $this->getEnteredValue();
        }
        if (!$config['typeahead'] || $mode=='search') {
            $this->value = $value;
            return parent::render($mode);
        }

        $source = array();
        foreach ($this->field->getList()->getItems() as $i)
            $source[] = array(
                'value' => $i->get('value'), 'id' => $i->get('id'),
                'info' => $i->get('value')." -- ".$i->get('extra'),
            );
        ?>
        <span style="display:inline-block">
        <input type="text" size="30" name="<?php echo $this->name; ?>"
            id="<?php echo $this->name; ?>" value="<?php echo $name; ?>"
            placeholder="<?php echo $config['prompt'];
            ?>" autocomplete="off" />
        <input type="hidden" name="<?php echo $this->name;
            ?>_id" id="<?php echo $this->name; ?>_id" value="<?php echo $value; ?>"/>
        <script type="text/javascript">
        $(function() {
            $('input#<?php echo $this->name; ?>').typeahead({
                source: <?php echo JsonDataEncoder::encode($source); ?>,
                property: 'info',
                onselect: function(item) {
                    $('input#<?php echo $this->name; ?>').val(item['value'])
                    $('input#<?php echo $this->name; ?>_id').val(item['id'])
                }
            });
        });
        </script>
        </span>
        <?php
    }

    function getValue() {
        $data = $this->field->getSource();
        // Search for HTML form name first
        if (isset($data[$this->name.'_id']))
            return (int) $data[$this->name.'_id'];
        return parent::getValue();
    }

    function getEnteredValue() {
        // Used to verify typeahead fields
        return parent::getValue();
    }
}
?>