Message: undefined index in CI image upload - php

Question

I am working a CI developer since from 1 year and i didn't face this type of error. I try to get image name through post but it will give me image like this: c:\fakelink\imagename, i don't know what's the issue kindly help me to solve this issue.
Here is my view code:
<form id="profile_update" enctype="multipart/form-data">
<div class="form-group">
<img src="<?php echo base_url()?>public/assets/plugins/images/users/varun.png" class="thumb-lg img-circle" alt="img">
<div class="row">
<div class="form-group col-sm-6">
<input type="file" class="form-control" id="user_image" name="user_image">
</div>
</div>
</div>
<div class="form-group">
<button type="submit" class="btn btn-primary">Submit</button>
</div>
</form>
here is Ajax Code:
type: "POST",
url: base_url + "admin/update_profile",
data: 'user_image=' + user_image,
here is Model Code:
$config = array(
'upload_path' => './uploads/',
'allowed_types' => 'gif|jpg|png|jpeg',
'max_size' => '2048',
);
if($_FILES['user_image']['name'] != '') {
$image = 'user_image';
$upload_data = $this->do_upload($image, $config);
if ($upload_data['condition'] == 'error') {
echo json_encode(array('condition' => 'error', 'message' => $upload_data['error'] . ' (Profile image)'));
exit;
} else {
$account_array['foto'] = $upload_data['upload_data']['file_name'];
}
}
The error is located on this line:
if($_FILES['user_image']['name'] != '') {
Thanks to all for any help.

Answer 1

Your Ajax code is not correct. Add these lines to your Ajax:
var formdata = new FormData ($('#profile_update')[0]); //get form data using HTML5 FormData Object
$.ajax({
type: "POST",
url: base_url + "admin/update_profile",
data: formdata,
contentType: false, //set content type to false so that the browser will set the content type to multipart
processData: false, //Also set process data to false so that the data being sent will not be serialized
success: function(res){
//Success function goes here..
}
});
Use **name user_image instead of id.**