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Asked: 2026-05-28T16:38:48+00:00

I have a custom form implemented in a custom module in drupal 6. The

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I have a custom form implemented in a custom module in drupal 6.
The form contains an upload field, a textfield and a select dropdown.
When the dropdown fires a change event, two textfields are loaded dynamically below the dropdown through drupal AHAH.
This is based largely on: http://drupal.org/node/331941
The form functions correctly.

However, if I happen to browse to a file from the upload field and then change the dropdown, I get the nasty ‘http 0 error’. Note: I am not submitting the form. I am simply selecting the file to upload and then changing the dropdown to fire the change event.
This problem is very much like: http://drupal.org/node/399676
However the solution provided in the same thread: http://drupal.org/node/399676#comment-1438662 doesn’t work for me.

I changed the drupal_json call to drupal_get_js call as mentioned in the solution comment above, but I simply get an error alert containing some JSON.

I believe the problem is to do with the headers set by drupal_json as seen in the definition here: http://api.drupal.org/api/drupal/includes–common.inc/function/drupal_json/6

Any help much appreciated.

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1 Answer

  1. Editorial Team

    This turned out to be such a pervasive problem, that I simply moved to drupal 7 –
    upgrading all my custom modules to 7.

    I looked everywhere online and found many suggestions and none of them worked.
    If someone else ever comes across this problem, I highly suggest you go the same path and simply upgrade to d7. The d7 FAPI is so much more robust, especially where ajax based dynamic forms are concerned.

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