Codeigniter - No result after sending jQuery post data

Question

I'm working on a signup form using jQuery's AJAX and Codeigniter PHP framework, but the codeigniter doesn't matter that much, if you see weird echo form_open(); or other weird things, don't worry, they're all codeigniter.

Okay, here's my problem with the code. I tried simple post using jquery below (in the php code everything else is omitted and added a simple echo 'hello, world!'; function, and it works / giving me a hello, world!):

 $.post( 'ajax_signup_username' ,function(result){

                $(span_error).html(result);

            } );

But when I passed a post data in it, it doesn't work (doesn't output any result,note that I'm using the full PHP code written below-below):

$.post( 'ajax_signup_username', {php_username_error:username_value} ,function(result){

                $(span_error).html(result);

            } );

I've tried searching SO, but the solutions provided didn't solve this. Any idea what's wrong?

Here are the full codes:

Following is the html code:

<body>

<?php $attr = array( 'onsubmit' => 'return final_val()' ); echo form_open('formValidation/signUp',$attr); ?>


<p>Username: <input type="text" onBlur="username_val()" value="<?php echo set_value('username')?>" name="username" maxlength="50" /><span name="username_error"><?php echo form_error('username'); ?></p></span>


<p>Email: <input type="text" onBlur="email_val()" value="<?php echo set_value('email')?>" name="email" maxlength="50" /><span name="email_error"><?php echo form_error('email'); ?></p></span>


<p>Password: <input type="password" onBlur="pass_val()" value="<?php echo set_value('pass')?>" name="pass" maxlength="50" autocomplete="off"/><span name="pass_error"><?php echo form_error('pass'); ?></p></span>


<p>Password Confirm: <input type="password" onBlur="pass_val()" value="<?php echo set_value('passconf')?>" name="passconf" maxlength="50" autocomplete="off" /><span name="passconf_error"><?php echo form_error('passconf'); ?></p></span>



<p><input type="submit" value="SIGN UP!" name="signup"/></p>


</form>



</body>

Following is the php code:

function ajax_signup_username(){

    $username = $_POST['php_username_error'];

    $uniqueUn = $this->db->prepare("SELECT * FROM iowfiwefwmember WHERE username=:username");

    $uniqueUn->bindParam(':username', $username);

    $uniqueUn->execute();

    $count1 = $uniqueUn->fetch();

    if( $count1 == FALSE ){

        echo 'USERNAME AVAILABLE!';

    }else{

        echo 'USERNAME IS ALREADY USED!';

    }

}

Following is the javascript code:

function username_val(){

        $.ajaxSetup({ cache : false });

            username_value = $("input[name='username']").val();

            span_error = "span[name='username_error']";

            //$(span_error).load('ajax_signup_username', {php_username_error:username_value}); <-- also doesn't work [ $.ajaxSetup() is set to POST ]

            $.post( 'ajax_signup_username', {php_username_error:username_value} ,function(result){

                $(span_error).html(result);

            } );

    }

Do you get a JavaScript error? What happens when you make a post request to the URL directly? — Explosion Pills
– Explosion Pills, Commented May 24, 2012 at 16:07
Also please don't bother the PDO codes, the point is that after sending a post data in the parameter, it doesn't work. — PHP For Life
– PHP For Life, Commented May 24, 2012 at 16:07
@ExplosionPills The web developer toolbar in firefox gave me a POST Server Error, but I tried navigating the code in the browser and it exists. — PHP For Life
– PHP For Life, Commented May 24, 2012 at 16:09
how are you routing the url 'ajax_signup_username' to the function? Is this some CodeIgniter magic? — vansimke
– vansimke, Commented May 24, 2012 at 16:10
@PHPForLife navigating in the browser is not enough .. you have to make the same post request using the browser or some other user agent. — Explosion Pills
– Explosion Pills, Commented May 24, 2012 at 16:11

PHP For Life · Accepted Answer · 2012-05-25 05:51:31Z

1

After long hours of doing dumb faces in front of my laptop, I found out that this IS a codeigniter issue, I turned on CSRF protection which caused the problem. After turning off CSRF feature, it works just fine, make sure not to repeat the same mistake, youngsters! Cheers! :D

answered May 25, 2012 at 5:51

PHP For Life

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1 Comment

Mauricio A. Cinelli Over a year ago

I wouldn't recommend CodeIgniter for new developments though. Since Ellislab decided not to support it anymore, it took almost 2 years for some bug fixes be realeased from version 2.1.3 to 2.1.4. But yeah, for me the CSRF features also caused problems.

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