我试图在用户使用 Codeigniter 点击提交按钮之前先检查用户名的有效性。用户名的状态（无论是否被占用）将仅显示在其旁边。
下面是视图中的 JS：
<script type="text/javascript" src="../assets/js/jquery.min.js"></script>
<script type="text/javascript"><!--
$(document).ready(function() {
$("#username").blur(function() {
//remove all the class add the messagebox classes and start fading
$("#msgbox").removeClass().addClass('messagebox').text('Checking...').fadeIn("slow");
//check the username exists or not from ajax
$.post("addpatient/check_user_availability",{ username:$(this).val() } ,function(data) {
if(data=='no') {
$("#msgbox").fadeTo(200,0.1,function() { //start fading the messagebox
//add message and change the class of the box and start fading
$(this).html('This User name Already exists').addClass('messageboxerror').fadeTo(900,1);
});
}
else {
$("#msgbox").fadeTo(200,0.1,function() { //start fading the messagebox
//add message and change the class of the box and start fading
$(this).html('Username available to register').addClass('messageboxok').fadeTo(900,1);
});
}
});
});
});
</script>
以下是 html 表单的一部分：
<form method="post" action="addpatient/insert" name="register">
<table id='addpatient'>
<tr>
<td width=100> Username:
<td width=150> <input type='text' id='username' name='username' value="<?php if(isset($_POST['username'])) echo $_POST['username']; ?>" placeholder="5-15 char" pattern=".{5,15}" required>
<td> <span id="msgbox" style="display:none"></span>
<td><div id="msgbox"></div>
</tr>...
这是控制器：
function check_user_availability()
{
$username = $this->input->post('username');
// Developed by Roshan Bhattarai
// Visit http://roshanbh.com.np for this script and more.
// This notice MUST stay intact for legal use
//this varible contains the array of existing users
$existing_users=$this->user->get_all_usernames();
//value got from the get metho
$user_name= $username;
//checking weather user exists or not in $existing_users array
if (in_array($user_name, $existing_users))
{
//user name is not availble
echo "no";
}
else
{
//user name is available
echo "yes";
}
}
这是模型中的一个函数：
function get_all_usernames() {
$this->db->select('username');
$this->db->from('users');
$query = $this->db->get();
return $query->result();
}
但是，当我运行它时，它总是说用户名可以注册，即使用户名已经被占用。
另一个问题是，当用户"实时"输入他/她想要的用户名时，它不会检查用户名的有效性。我的意思是，在代码检查有效性之前，用户必须先单击下一个文本字段。
请帮我解决这些问题。谢谢！
试试这个：
function check_user_availability()
{
$username = $this->input->post('username');
$result = $this->user->get_all_usernames( $username ); #send the post variable to the model
//value got from the get metho
$user_name= $username;
if( $result ){
echo "no";
}else{
echo "yes";
}
}
function get_all_usernames( $username ) {
$this->db->select('username');
$this->db->where('username', $username)
$this->db->from('users', 1);
$query = $this->db->get();
if( $query->num_rows() > 0 ){
return 0;
}else{
return 1;
}
}
脚本中的更改：
$(document).ready(function() {
$("#username").keyup(function() {
//remove all the class add the messagebox classes and start fading
$("#msgbox").removeClass().addClass('messagebox').text('Checking...').fadeIn("slow");
//check the username exists or not from ajax
var name = $(this).val();
$.ajax({
url : "<?=base_url()?>addpatient/check_user_availability",
data : { username : name },
type : 'POST',
success : function(data){
if( data == '0' ){
$("#msgbox").fadeTo(200,0.1,function() { //start fading the messagebox
//add message and change the class of the box and start fading
$(this).html('This User name Already exists').addClass('messageboxerror').fadeTo(900,1);
});
}else if( data == '1' ){
$("#msgbox").fadeTo(200,0.1,function() { //start fading the messagebox
//add message and change the class of the box and start fading
$(this).html('Username available to register').addClass('messageboxok').fadeTo(900,1);
});
}else{
alert("Some error occured! Check Console");
}
}
});
});
});
控制器：
function check_user_availability() {
$username = $this->input->post('username');
$this->form_validation->set_rules('username', 'Username', 'required|is_unique[users.username]');
if ($this->form_validation->run() == FALSE) {
//user name is not availble
echo "no";
} else {
//user name is available
echo "yes";
}
}
将控制器中的 check_user_availability（） 替换为上述。 无需使用您的get_all_usernames model。
查看Form_Validation、set_rules的文档