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<?php
/*
Grap checkbox values from a migx grid.
Author: michelle84
*/
$resource = $modx->getObject('modResource',1);
$migxEntries = $resource->getTVValue('tagOptions');
$migxEntries2 = json_decode($migxEntries, true);
$numItems = count($migxEntries2);
$i = 0;
foreach ($migxEntries2 as $key => $jsons) { // This will search in the 2 jsons
     foreach($jsons as $key => $value) {
        if($i+1 == $numItems) {
            $output .= $value."==".$value; 
    } else {
      $output .= $value."==".$value."||";
    }
        
        $i++;              
    }
}
return $output;

input type: migx
Form type:
[{
  "caption":"Categories",
  "fields": [{
    "field":"category",
    "caption":"Category"
  }]
}]
Grid columns:
[
{"header": "Category", "width": "30", "sortable": "false", "dataIndex": "category"}
]

input type: checkbox
input option values: @EVAL return $modx->runSnippet('readCategoryOptions');