Hmm, I see, That seems to be a pre-factured processor and im not really sure how you could add this age plugin to that. It may be better to age validate through javascript, this would be a simmilar approach.
After quick googling, I found http://www.kuranes.co.uk/utils/agecheck.html
Code:
<script language="javascript">
function checkAge()
{
/* the minumum age you want to allow in */
var min_age = 8;
var max_age = 18;
/* change "age_form" to whatever your form has for a name="..." */
var year = parseInt(document.forms["age_form"] ["year"] .value);
var month = parseInt(document.forms["age_form"] ["month"] .value) - 1;
var day = parseInt(document.forms["age_form"] ["day"] .value);
var theirDate = new Date((year + min_age), month, day);
var today = new Date;
if ( (today.getTime() - theirDate.getTime()) < 0) {
alert("Get Out, Scum!");
return false;
}
else {
return true;
}
}
</script>
HTML:
Code:
<form action="http://www.kuranes.co.uk" method="get" name="age_form">
Day : <select name="day">
<option>1</option>
<option>2</option>
<option>3</option>
<option>4</option>
<option>5</option>
<option>6</option>
<option>7</option>
<option>8</option>
<option>9</option>
<option>10</option>
<option>11</option>
<option>12</option>
<option>13</option>
<option>14</option>
<option>15</option>
<option>16</option>
<option>17</option>
<option>18</option>
<option>19</option>
<option>20</option>
<option>21</option>
<option>22</option>
<option>23</option>
<option>24</option>
<option>25</option>
<option>26</option>
<option>27</option>
<option>28</option>
<option>29</option>
<option>30</option>
<option>31</option>
</select>
Month : <select name="month">
<option>1</option>
<option>2</option>
<option>3</option>
<option>4</option>
<option>5</option>
<option>6</option>
<option>7</option>
<option>8</option>
<option>9</option>
<option>10</option>
<option>11</option>
<option>12</option>
</select>
Year : <select name="year">
<option>2003</option>
<option>2002</option>
<option>2001</option>
<option>2000</option>
<option>1999</option>
<option>1998</option>
<option>1997</option>
<option>1996</option>
<option>1995</option>
<option>1994</option>
<option>1993</option>
<option>1992</option>
<option>1991</option>
<option>1990</option>
<option>1989</option>
<option>1988</option>
<option>1987</option>
<option>1986</option>
<option>1985</option>
<option>1984</option>
<option>1983</option>
<option>1982</option>
<option>1981</option>
<option>1980</option>
<option>1979</option>
<option>1978</option>
<option>1977</option>
<option>1976</option>
<option>1975</option>
<option>1974</option>
<option>1973</option>
<option>1972</option>
<option>1971</option>
<option>1970</option>
<option>1969</option>
<option>1968</option>
<option>1967</option>
<option>1966</option>
<option>1965</option>
<option>1964</option>
<option>1963</option>
<option>1962</option>
<option>1961</option>
<option>1960</option>
<option>1959</option>
<option>1958</option>
<option>1957</option>
<option>1956</option>
<option>1955</option>
<option>1954</option>
<option>1953</option>
<option>1952</option>
<option>1951</option>
<option>1950</option>
<option>1949</option>
<option>1948</option>
<option>1947</option>
<option>1946</option>
<option>1945</option>
<option>1944</option>
<option>1943</option>
<option>1942</option>
<option>1941</option>
<option>1940</option>
<option>1939</option>
<option>1938</option>
<option>1937</option>
<option>1936</option>
<option>1935</option>
<option>1934</option>
<option>1933</option>
<option>1932</option>
<option>1931</option>
<option>1930</option>
<option>1929</option>
<option>1928</option>
<option>1927</option>
<option>1926</option>
<option>1925</option>
<option>1924</option>
<option>1923</option>
<option>1922</option>
<option>1921</option>
<option>1920</option>
<option>1919</option>
<option>1918</option>
<option>1917</option>
<option>1916</option>
<option>1915</option>
<option>1914</option>
<option>1913</option>
<option>1912</option>
<option>1911</option>
<option>1910</option>
<option>1909</option>
<option>1908</option>
<option>1907</option>
<option>1906</option>
<option>1905</option>
<option>1904</option>
<option>1903</option>
</select>
<input type="submit" name="_send_date_" value="Go" onClick="return checkAge()">
</form>
</div>
However this is veering from PHP and of course it will not work if you disable javascript. You may want to post in the javascript section of this site for further help if you run into problems.
Bookmarks