使用ajax判断用户是否已经存在,并提示。

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使用ajax判断用户是否已经存在,并提示
 
<html>
<br/>

<script>
        $(document).ready(
                        function()
                                 {
                                        $("#username").blur(function() 
                                        {
                                                var q=$(this).val()
                                        
                                        $.get('/checkuserexists/'+q,function(data,status)
                                                {
                                        //alert("val: "+q+ "Data: " + data + "\nStatus: " + status);
                                                        if(data!='0'){ 
                                                                //alert('user exists~~');
                                                                //alert($("#username").parent().html())
                                                                old=$("#username").parent().html();
                                                                //alert(old);
                                                        errormsg='<strong class="wrong">user exists</strong>';
                                                                $("#username").parent().html(old+errormsg)
                                        }

                                                }
                                              )
                                        
                                        //alert($(this).val());
                                        });
                                }
                        )
</script>

<h1>Register</h1>
<form method="POST">
    <table>
    <tr><th><label for="username">username</label></th><td><input type="text" id="username" value="" name="usernam
e"/></td></tr>
    <tr><th><label for="email">E-Mail</label></th><td><input type="text" id="email" value="11" name="email"/><stro
ng class="wrong">must be a valid email address</strong></td></tr>
    <tr><th><label for="password">Password</label></th><td><input type="password" id="password" value="" name="pas
sword"/><strong class="wrong">must be between 3 and 20 characters</strong></td></tr>
    <tr><th><label for="password2">Repeat password</label></th><td><input type="password" id="password2" value="" 
name="password2"/></td></tr>
    <tr><th><label for="submit"></label></th><td><button type="submit" id="submit" value="submit" name="submit">su
bmit</button></td></tr>
</table>
</form>
<a href='/listusers'>view all users</a>



</body>
</html>
原文链接:https://www.f2er.com/ajax/166763.html

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