[Answer]-Relation between two form fields

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There’s no simple way to do this. You’ll need Javascript and custom validation on the server.

Using jQuery, the client code might look like this:

var F2_CHOICES = {
    'a' : { 'c' : 'c', 'd' : 'd'},
    'b' : { 'e' : 'e', 'f' : 'f'}
};
var $field2 = $('[name=field2]');
  $('[name=field1]').change(
  function() {
      var currentValue = $(this).val() ;
      $field2.empty();
      for (o in F2_CHOICES[currentValue]){
            $field2.append('<option '+' value="'+o+'">'+F2_CHOICES[currentValue][o]+'</option>');
      }
  });

On the server, you’ll need to define a clean method on your form to check if field2 value is one of the choices that correspond to field1 value.

👤atereshkin

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