/**
* Adds hidden field to form for JavaScript test
* @return string
*/
public static function AddJSCode()
{
global $wgCTHiddenFieldName, $wgCTHiddenFieldDefault, $wgCTExtName;
$ct_checkjs_key = CTBody::getJSChallenge();
$field_id = $wgCTHiddenFieldName . '_' . md5(rand(0, 1000));
$html = '
<input type="hidden" id="%s" name="%s" value="%s" />
<script type="text/javascript">
// <![CDATA[
var ct_input_name = \'%s\';
var ct_input_value = document.getElementById(ct_input_name).value;
var ct_input_challenge = \'%s\';
document.getElementById(ct_input_name).value = document.getElementById(ct_input_name).value.replace(ct_input_value, ct_input_challenge);
if (document.getElementById(ct_input_name).value == ct_input_value) {
document.getElementById(ct_input_name).value = ct_set_challenge(ct_input_challenge);
}
function ct_set_challenge(val) {
return val;
};
// ]]>
</script>
';
$html = sprintf($html, $field_id, $wgCTHiddenFieldName, $wgCTHiddenFieldDefault, $field_id, $ct_checkjs_key);
$html .= '<noscript><p><b>Please enable JavaScript to pass anti-spam protection!</b><br />Here are the instructions how to enable JavaScript in your web browser <a href="http://www.enable-javascript.com" rel="nofollow" target="_blank">http://www.enable-javascript.com</a>.<br />' . $wgCTExtName . '.</p></noscript>';
return $html;
}