怎样set focus?

nic58191

我检查顾客的nric是否只有一个而已，如果发现已经在系统里
就会popup alert
我要怎样set focus呢？

1. if ( ! checkUnique('user_new_nric', $_POST['user_new_nric']) )
   
2.                 {
   
3.                         echo '<script = "JAVASCRIPT">alert("The new NRIC you used is associated with another user. Please try again!")
   
4.                         </script>';
   
5.                 }

复制代码

wewanwang

试试这个：

echo '<script = "JAVASCRIPT">alert("The new NRIC you used is associated with another user. Please try again!");
document.yourform.fieldname.focus();
</script>';

nic58191

回复 2# wewanwang

Error:'document.subAgent.user_new_nric' is null or not an object

clown09

if ( ! checkUnique('user_new_nric', $_POST['user_new_nric']) )
                {
                        echo '<script = "JAVASCRIPT">alert("The new NRIC you used is associated with another user. Please try again!")
                        </script>';
                }

请在user_new_nric的input 加上 id, eg:
<input type="text" name="user_new_nric" id="user_new_nric" value="" />
Javascript 部分：
<script type="text/javascript">
document.getElementById("user_new_nric").focus();
</script>. 请把这部分的code放置在<input type="user_new_nric" />出现之后。Error:'document.subAgent.user_new_nric' is null or not an object 的问题是因为你在<input />之前，放入<script>，这样js 这么可能找到<input />?