Have you tried with javascript?

If the selectbox has an id should be simple accomplish your goal.

For example:

<script>
document.getElementById('listofvalues').value='3';
</script>

sets as selected the option with value = '3'  in the following selectbox.

   <select name="listofvalues" id="listofvalues">
      <option value="1">Value 11</option>
      <option value="2">Value 22</option>
      <option value="3">Value 33</option>
      <option value="4">Value 44</option>
      <option value="5">Value 55</option>
   </select>


Il giorno venerdì 11 agosto 2017 12:59:17 UTC+2, Simona Chovancová ha 
scritto:
>
> I need to change selected option in the view, I know that to change input 
> value I do it like this: {{form.element('input', _name='field')['_value'] = 
> "new_value"}}, but how do I do this with select? Also, this needs to be 
> done in view, not controller so I cannot use default='some_option'.
> Any ideas? Thanks!
>

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