How to call javascript function in callback function of codeigniter controller? - php

Question

I want call the javascript function into callback function of codeigniter controller.
Controller: Callback function
public function email_exist($id) {
$this->db->where('email', $id);
$query = $this->db->get('login');
if (!$query->num_rows() > 0) {
$this->form_validation->set_message(__FUNCTION__, $this->email_validate());
return FALSE;
} else {
return TRUE;
}
Javascript: Alert function
function email_validate(){
alert('Invalid Email Id');
}
An uncaught Exception was encountered
Type: Error
Message: Call to undefined method Login::email_validate()
Filename: C:\wamp64\www\CodeIgniterProject1\application\controllers\login.php
Line Number: 46
login_form.php
<?php echo validation_errors(); ?>
<?php echo form_open_multipart(); ?>
<form name="form">
<div class="loginform">
<?php echo form_label('LOGIN', 'login'); ?>
</div>
<div class="email">
<?php echo form_input('email', 'E-MAIL', set_value('email')); ?>
</div>
<div class="password">
<?php echo form_password('password', 'PASSWORD', set_value('password')); ?>
</div>
<div class='checkbox'>
<?php
echo form_checkbox(array(
'name' => 'remember',
'id' => 'remember',
'value' => 'REMEMBER ME',
'checked' => FALSE,
'style' => 'margin:1px'
)) . form_label('REMEMBER ME', 'remember');
?>
</div>
<div class='btnlogin'>
<?php echo form_submit('login', 'LOGIN'); ?>
</div>
</form>

Answer 1

you cant do that in Codeigniter, use Codeigniter default form validation library
View here
if you want to add css for validation errors then try set_error_delimeters()
if you have bootstrap then use
alert alert-danger
class, else create one class
$this->form_validation->set_error_delimiters('<div class="alert alert-danger">', '</div>');
see
[other suggestions]
instead of putting all error in the top, you can also try
<?php
echo form_error('email');
form_input('email', 'E-MAIL', set_value('email'));
?>
other options is jquery validation or js validation, write js in view or external .js file
<?php
data = array(
'name' => 'username',
'id' => 'username', //use the id for jquery validation $('#username').on('blur', function() { });
'value' => 'johndoe',
'maxlength' => '100',
'size' => '50',
'style' => 'width:50%'
'onBlur' => 'email_validate();' //use this for javascript validation
);
echo form_input($data);
?>
im unable to comment, thats why posting as answer