我正在使用带有代码点火器的kyeup功能，但kyeup功能无法正常工作

Question

我在模态上使用带有CodeIgniter的kyeup函数，但结果未显示。 javaScript 工作第一次警报消息，但 secound 时间返回响应消息未显示。我正在分享代码"HTML ，javaScript，控制器，模型"请分享有价值的想法先生...

.HTML

<input type="text" class="form-control" name="pran_no" id="pran_no" required="">
<div id="msg"> </div>//error mag not show

JavaScript

<script>    
$(document).ready(function()
{
$('#pran_no').keyup(function()
{
var pran_no = $('#pran_no').val();
//alert(pran_no);here working fine
$.ajax({
type: "POST",
url: "<?php echo base_url(); ?>pran_no_exist",
data: "pran_no="+pran_no,                     
success: function(response)
{
//alert(response);//here not show error
$('#msg').html(response);
}
});
});
});
</script>

控制器

function pran_no_exist()
{
$result = $this->Cms_model->pran_no_exist();
//echo $result;   
}

模型

public function pran_no_exist() { 
$pran_no = $this->input->post('pran_no');
$this->db->select('pran_no');
$this->db->from('users');
$this->db->where('pran_no',$pran_no);
$querya = $this->db->get();
if ($querya->num_rows() > 0)  
{
echo '<p style="color:red;">Already Existing Pran No.</p>';
}else {
echo '<p style="color:green;">Not Existing Pran No.</p>';
}
} 

Answer 1

Javascript

<script>    
$(document).ready(function()
{
$('#pran_no').keyup(function()
{
var pran_no = $('#pran_no').val();
//alert(pran_no);here working fine
$.ajax({
type: "POST",
url: "<?php echo base_url(); ?>pran_no_exist",
data: {'pran_no':pran_no},                     
success: function(response)
{
//alert(response);//here not show error
$('#msg').html(response);
}
});
});
});
</script>

控制器

function pran_no_exist() {
$pran_no = $this->input->post('pran_no');
$result = $this->Cms_model->pran_no_exist($pran_no);
if ($result) {
if ($result->num_rows() > 0)  
{
echo '<p style="color:red;">Already Existing Pran No.</p>';
}else {
echo '<p style="color:green;">Not Existing Pran No.</p>';
}
}
}

型

public function pran_no_exist($pran_no) { 
$this->db->select('pran_no');
$this->db->from('users');
$this->db->where('pran_no',$pran_no);
return $this->db->get();
} 

Answer 2

尝试将键更改为输入更改：

Javascript：

<script>    
$(document).ready(function()
{
$('#pran_no').keyup(function()
{
var pran_no = $('#pran_no').val();
//alert(pran_no);here working fine
$.ajax({
type: "POST",
url: "<?php echo base_url(); ?>pran_no_exist",
data: {pran_no:pran_no},                     
success: function(response)
{
var result = JSON.parse(response);
if(result == null)
{alert("Not Existing Pran No.");}
else{ alert("alread existing");
}
}
});
});
});
</script>

控制器：

function pran_no_exist() {
$result = $this->Cms_model->pran_no_exist($_POST["pran_no"]);
echo json_encode($result); 
}

型号代码：

public function pran_no_exist($pran_no) { 
$this->db->select('pran_no');
$this->db->from('users');
$this->db->where('pran_no',$pran_no);
$querya = $this->db->get()->row();
return $querya;
} 

Answer 3

$.ajax({
type: 'POST',
url: 'baseurl path',
data: { 
'foo': 'bar'
},
success: function(msg){
alert('wow' + msg);
}
});