function charts_plugin_style_chart::validate in Charts 7.2

Make sure the display and all associated handlers are valid.

Return value

Empty array if the display is valid; an array of error strings if it is not.

Overrides views_plugin_style::validate

File

views/charts_plugin_style_chart.inc, line 102

Contains the Chart style (format) plugin (similar to Table, HTML List, etc.)

Class

charts_plugin_style_chart

Style plugin to render view as a chart.

Code

function validate() {
  $errors = array();
  $field_handlers = $this->display->handler
    ->get_handlers('field');

  // Don't execute validation on the new view page.
  if ($_GET['q'] === 'admin/structure/views/add') {
    return;
  }

  // Make sure that all chart extensions first have a parent chart selected.
  if ($this->plugin_name === 'chart_extension' && $this
    ->get_parent_chart_display() === FALSE) {
    $errors[] = t('This chart add-on must have a parent chart selected under the chart settings.');
  }
  elseif (count($field_handlers)) {
    $data_field_key = !empty($this->options['data_fields']) ? current($this->options['data_fields']) : NULL;
    if (empty($data_field_key)) {
      $errors[] = t('At least one data field must be selected in the chart configuration before this chart may be shown');
    }
    else {
      $data_field = isset($field_handlers[$data_field_key]) ? $field_handlers[$data_field_key] : NULL;
      if (!isset($data_field)) {
        $errors[] = t('A field you have specified as a data field in your chart settings no longer exists. Edit the chart settings and select at least one data field.');
      }
    }
  }
  return $errors;
}