Real time Email Checking in Database using PHP Codeigniter, Ajax and Jquery - php

Question

I am trying to implement a realtime email duplication check in an application using PHP Codigniter, Ajax and Jquery. But I am not getting any successful results.
Jquery
<script type="text/javascript">
$(document).ready(function()
{
$("#email").keyup(function()
{
if($("#email").val().length >= 4)
{
$.ajax(
{
type: "POST",
url: "<?php echo site_url('stthomas/check_user');?>",
data: "email="+$("#email").val(),
success: function(msg)
{
if(msg=="true")
{
$("#usr_verify").css({ "background-image": "url('<?php echo base_url();?>images/yes.png')" });
}
else
{
$("#usr_verify").css({ "background-image": "url('<?php echo base_url();?>images/no.png')" });
}
}
});
}
else
{
$("#usr_verify").css({ "background-image": "none" });
}
});
});
</script>
My Form is as Follows
<div class="form-group formgp">
<label class="col-md-4" for="Inputemail">Email :</label>
<div class="col-md-8" >
<input type="text" name="email" class="form-control" id="email" value="<?php echo set_value('email'); ?>" placeholder="Email"> <span id="usr_verify" class="verify"></span>
</div>
</div>
Controller:
public function check_user()
{
$usr=$this->input->post('email');
$result=$this->stthomas_model->check_user_exist($usr);
if($result)
{
echo "false";
}
else{
echo "true";
}
}
Model:
public function check_user_exist($usr)
{
$this->db->where("email",$usr);
$query=$this->db->get("email");
if($query->num_rows()>0)
{
return true;
}
else
{
return false;
}
}

Answer 1

It is not easy to guess what the problem is, but you better check the jquery ajax error detail. you have just set the success part of process in your code:
success: function(msg){
See what error you have if the ajax gets an error:
success: function(msg){
// success code
},
error: function(xhr, status, error) {
var err = eval("(" + xhr.responseText + ")");
alert(err.Message);
}