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I have an node view with an exposed filer for nid. It seems that I can put only one value (one nid) in there. But is there anyway I can filter down nodes by multiple nid? I tried these in the form "1 and 2" "1,2" "1 2" but didn't work.

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I don't think this can be done by Views only.

You must create a custom module that use the hook_views_query_alter() (The code is for Drupal 7)

function my_module_views_query_alter(&$view, &$query) {
  // we only want to alter this view, so we check against the machine name
  // and we make sure our exposed filter is set
  if ($view->current_display == 'my_current_display' && $view->exposed_raw_input['nid']) {
    // first we grab the value from our filter and convert it into an array
    // make sure you use the same character you used to delimit the string
    $nids = explode(',',$view->exposed_raw_input['nid']);

    // now we loop over the array of values we created from our exposed filter field
    foreach ($nids as $nid){
      // Be conscience of the ‘where[1]’
      // In the $query object you noticed the conditions array had multiple arrays.
      // Each filter in your view will be placed in a conditions array.
      // It is important to include the empty brackets [] after ['conditions']. This will append the new conditions instead of overwriting them.
      $query->where[1]['conditions'][] = array(
        'field' => 'node.nid', // this is ‘table.field’ from your database. If you used another filter than ‘Content: nid’ this will change. i.e ‘users.uid’
        'value' => $nid,  // looped value from our values array
        'operator' => '!=',  // condition operator. I want to filter out nids, so I am using ‘not equal’
      );
    }
  }
}

Disclaimer: I run a similar issue and the solution gave to be by the below article. The code and the credits go to Peter Schuelke.

More information can be found here:

http://www.metaltoad.com/blog/passing-multiple-values-through-exposed-filter

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