如何将数据/值从CI_Controller发送/返回到AJAX

As the title, i want to CI_Controller return value/data back to AJAX which give request before.

作为标题，我想要CI_Controller将值/数据返回给AJAX，它会在之前发出请求。

The_Controller.php

The_Controller.php

class The_Controller extends CI_Controller
{

    public function __construct()
    {
        parent::__construct();
    }

    function postSomething()
    {
        $isHungry = true;
        if(isHunry){
            return true;
        }else{
            return false;
        }
    }

}

AJAX

AJAX

$(document).ready(function() {

$(文档)时函数(){

        $('#form').on('submit', function (e)
        {
            e.preventDefault(); // prevent page reload
            $.ajax ({
                type : 'POST', // hide URL
                url : '/index.php/The_Controller/postSomething',
                data : $('#form').serialize (),
                success : function (data)
                {
                    if(data == true)
                    {
                        alert ('He is hungry');
                    }
                    else
                    {
                        alert ('He is not hungry');
                    }       
                }
                , error: function(xhr, status, error)
                {
                    alert(status+" "+error);
                }
            });
            e.preventDefault();
            return true;
        });
    });

The Problem :

存在的问题:

The AJAX code above always get FALSE for variable data. It's not get return value from postSomething function inside CI_Controller.

上面的AJAX代码对于变量数据总是为FALSE。它不会从CI_Controller中的postSomething函数获得返回值。

The Question :

一个问题:

I want to if(data == true) result alert ('He is hungry');. But cause data not fill by return value of postSomething function inside CI_Controller so it always false. How to get return value/data from CI_Controller to AJAX?

我想要if(data == true) result alert ('He is hungry');但是由于CI_Controller中的postSomething函数的返回值不填充数据，所以总是为false。如何从CI_Controller返回值/数据到AJAX?

Thank you

谢谢你！

2 个解决方案

#1

you need to change your code a little bit. no need to return data, just echo true or echo false from your controller. Hope you will get your desired result.

您需要稍微修改一下代码。不需要返回数据，只需从控制器中返回true或echo false。希望你能得到你想要的结果。

#2

You have a typo in the PHP code

PHP代码中有一个错码

    if(isHunry){

should be

应该是

    if($isHungry){

Also, returning data to an AJAX request, you really should be sending the correct content type in the header. Ex.

此外，将数据返回到AJAX请求时，实际上应该在头中发送正确的内容类型。前女友。

header('Content-Type: application/json');

And print or echo the data, not return it, as well as json_encode it:

并打印或回显数据，而不返回数据，以及json_encode:

echo json_encode($data);

So your postSomething php function should look something like this:

所以你的postSomething php函数应该是这样的:

$isHungry = true;
header('Content-Type: application/json');
echo json_encode($isHungry);

#1