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How can I get the #value of a hidden form field in javscript as for hidden form
field I am unable to get its id in the (inspect element) html.
How can I extract the value(#value) for the field using ajax for the hidden fields

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Try this:

$form['hidden'] = array(
 '#type' => 'hidden',
 '#value' => 'Your_value',
 '#attributes' => array('id' => array('your_id')),
);

Now using javascript or jquery you get the value of the hidden field.

In jquery: jQuery("#your_id").val();

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