Form posting before ajax can update content My form is submitting faster than ajax can update my textarea. How can I delay the form from submitting so the ajax can update my textarea?

$form['submit']['#ajax'] = array(
'callback' =&gt; 'getCampaignString',
'event' =&gt; 'submit',
'wrapper' =&gt; 'Comments_replace',
'method' =&gt; 'replace',
);
$form['submitted']['Comments']['#prefix'] = '&lt;div id="Comments_replace"&gt;';
$form['submitted']['Comments']['#suffix'] = '&lt;/div&gt;';

 function getCampaignString(&amp;$form, &amp;$form_state){
    $campaingString = $form_state['values']['submitted']['campaignstring'];
    $comments = $form_state['values']['submitted']['Comments'];
    $comments = $comments."[".$campaingString."]";
    $form['submitted']['Comments'] = $comments;

    $form['submitted']['Comments'] = array(
        '#type' =&gt; 'textarea',
        '#title' =&gt; t('New Comments'),
        '#name' =&gt; 'submitted[Comments]',
        '#value' =&gt; $form['submitted']['Comments'],
    );

    return $form['submitted']['Comments'];

}


So basically I have this webform for getting leads. There is a textarea for comments on the form. What I need to do is append a string to the end of the comments text on POST. For example: Say they made a comment like "I want more information" and when they hit submit. I need to add a string to the end of the comments so in the post it will look like this: I want more information - campaignName. The only way I have found to add my campaingname to the post of the comments is to replace the textarea with the new information in it but I cannot seem to replace it fast enought when submitted.
function THEME_form_alter(&amp;$form, &amp;$form_state, $form_id) {
    $form['#validate'][] = 'webform_validate';
}

function webform_validate($form, &amp;$form_state) {
  //Appending comments field with campaignString
  $campaingString = $form_state['values']['submitted']['campaignstring'];
  $comments = $form_state['values']['submitted']['Comments'];
  $comments = "[".$campaingString."]  " . $comments;
  $form_state['values']['submitted']['Comments'] = $comments;
}