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A select element on my form gets processed with an AJAX callback. There is a Multiselect widget on the form, and I want to see the new value of the field as if the form had been submitted. But, the $form_state['values']['my_multiselect'] is always NULL when checked in the form builder function during AJAX callback. Where does Multiselect build the value from the form state?

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Looks like there's an existing answer on Multiselect issue queue: Changing multiselect options using #ajax, and it has the solution.

  • Thanks, Johnathan. I thought I had just done that search but it was for Reply module issue queue. – Joe Beuckman May 1 '12 at 14:30
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    While these links may answer the question, it is better to include the essential parts of the answer here and provide the link for reference. Link-only answers can become invalid if the linked page changes. meta.drupal.stackexchange.com/questions/585/… – user1359 Aug 27 '13 at 17:58

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