'Bad Request' with ajax and codeigniter
Question
Windows 10, Codeigniter 3, Wamp3.
Ajax post throws a Bad Request error. This is an old chestnut but online research shows the problem usually to be CSRF. However I emphasize at the outset that I have csrf disabled for this test:
config['csrf_protection'] = FALSE;
I have set up some deliberately very simple test code. The controller looks like this:
class Ajax extends CI_Controller {
public function index() {
$this->load->view('pages/index');
}
public function hello($name) {
$fullname = $this->input->post('fullname');
echo 'Hello '.$fullname;
}
}//EOF
and the view looks like this:
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Demo Ajax</title>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
<script>
$(function() {
$('#bttHello').click(function(){
var fullname = $('#fullname').val();
$.ajax({
type:'POST',
data: {fullname: fullname},
url:'<?php echo base_url('ajax/hello'); ?> + fullname',
success: function(result) {
$('#result1').html(result);
}
});
});
});
</script>
</head>
<body>
Name <input type="text" id="fullname">
<input type="button" value="Hello" id="bttHello">
<br>
<span id="result1"></span>
</body>
</html>
The console shows a Bad Request
POST XHR http://localhost/faith/ajax/hello%20+%20fullname [HTTP/1.1 400 Bad Request 9ms]
So if csrf is not the culprit, is it a Wamp issue? Everything else seems to work fine. I have spent so much time on this! What is going on?
5 answers
solution1
1 ACCPTED 2017-08-01 09:21:26
Data are already sent through POST . No need to pass it through URL
<script>
$(function() {
$('#bttHello').click(function(){
var fullname = $('#fullname').val();
$.ajax({
type:'POST',
data: {fullname: fullname},
url:"<?php echo base_url('ajax/hello'); ?>",
success: function(result) {
$('#result1').html(result);
}
});
});
});
</script>
And, remove parameter $name from controller action hello() .
public function hello() {
$fullname = $this->input->post('fullname');
echo 'Hello '.$fullname;
}
solution2
0 2017-08-01 09:18:59
write url like this
"url": "<?php echo base_url().'ajax/hello';?>/" + fullname
after /fullname its a argument of function hello()
solution3
0 2017-08-01 09:24:40
Try this..
<?php echo form_open('ajax/hello', [
'method' => 'post',
'class' => 'create_form'
]); ?>
<input type="text" name="fullname" value="Full Name"/>
<button type="submit">Create</button>
<?php echo form_close(); ?>
and ajax
$(document).on('submit', 'form.create_form', function (e) {
var self = this;
var formData = new FormData($(this)[0]);
$.ajax({
url: $(self).attr('action'),
type: 'POST',
data: formData,
async: false,
dataType: 'json',
success: function (res) {
console.log(res)
},
cache: false,
contentType: false,
processData: false
});
return false;
});
solution4
0 2017-08-01 12:11:21
The CodeIgniter Controller:
<?php
class Ajax extends CI_Controller
{
public function index()
{
$this->load->view('pages/index');
}
/**
* @param $name
*/
public function hello($name)
{
// if no $name params value pass and post exist
if ( ! isset($name) && $this->input->post('fullname')) {
// get value from post params
$fullname = $this->input->post('fullname', true);
} elseif (isset($name) && ! $this->input->post('fullname')) {
// get value from pass param method
$fullname = $name;
} else {
// default value
$fullname = 'No Name found';
}
// show ajax response
echo $fullname;
}
/**
* Another way if we using GET params
* e.g. http://wwww.site.com/ajax/hello/my-name-value
* @param $name
*/
public function hello_another($name)
{
// if url has param as name value
// remember codeigniter will map all url params as method params as they provided
// no need to use get input, it will take from url string directly
if (isset($name)) {
// get value from get params
$fullname = $name;
} else {
// default value
$fullname = 'No Name found';
}
// show ajax response
echo $fullname;
}
/**
* Another way if we using GET params and security is on top
* e.g. http://wwww.site.com/ajax/hello/my-name-value
* @param $name
*/
public function hello_another_secure($name)
{
// if url has param as name value
// remember codeigniter will map all url params as method params as they provided
// no need to use get input, it will take from url string directly
if (isset($name) && preg_match("/^[a-zA-Z'-]+$/", $name)) {
// get value from method params
$fullname = $name;
} else {
// default value
$fullname = 'No Name or invalid name found';
}
// show ajax response
echo $fullname;
}
}
//EOF
<script>
$(function() {
$('#bttHello').click(function(){
var fullname = $('#fullname').val();
$.ajax({
type:'POST',
data: {fullname: fullname},
url:'<?php echo base_url('ajax/hello'); ?>',
success: function(result) {
$('#result1').html(result);
}
});
});
});
</script>
<script>
$(function() {
$('#bttHello').click(function(){
var fullname = $('#fullname').val();
$.ajax({
type:'GET',
url:'<?php echo base_url('ajax/hello_another/'); ?> + fullname',
success: function(result) {
$('#result1').html(result);
}
});
});
});
</script>
The CodeIgniter is fully capable to fulfil your needs, Just look their AWESOME Document first..
solution5
-2 2017-08-01 09:10:34
use this way
you should concate fullname variable after quatation.
like this
url:'<?php echo base_url('ajax/hello'); ?>' + fullname
<script>
$(function() {
$('#bttHello').click(function(){
var fullname = $('#fullname').val();
$.ajax({
type:'POST',
data: {fullname: fullname},
url:'<?php echo base_url('ajax/hello'); ?>' + fullname,
success: function(result) {
$('#result1').html(result);
}
});
});
});
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