WordPress; PHP functions inside Ajax requests not working. Alternative?

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When calling a PHP page with Ajax (in my WordPress theme), the PHP echo 'Hello World!'; works fine, but calling other WordPress PHP functions such as get_bloginfo();, the function returns undefined. Is it possible to use WordPress functions inside ajax calls? What are the other options.. I know iframes may work. I am trying to load a page that outputs plugin functionality.

The error that pops up is {Fatal Error: Call to undefined function get_bloginfo() in … }

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4 comments

  1. I did not test it, try some thing like below using plugin

    <?php
/**
 * Plugin Name:  Blog information
 * Plugin URI: http://www.test.com/
 * Description: Displays Blog information
 * Version: 1.0
 * Author: your_name
 * Author URI: http://www.test.com/
*/
// Function for handling AJAX requests
function getblog_request_handler() {

    // Check that all parameters have been passed
    if ((isset($_REQUEST['request']) && ($_REQUEST['request'] == 'getblog_Action'))) {
        // Output the response from your call and exit
        echo get_bloginfo();
        exit();
    }
    elseif (isset($_REQUEST['request']) && ($_REQUEST['request'] == 'getblog_Action'))   {
        // Otherwise display an error and exit the call
        echo "Error: Unable to display request.";
        exit();
    }

}

// Add the handler to init()
add_action('init', 'getblog_request_handler');

?>

    And use JS to call plugin function to get response,

    ....

        jQuery.ajax({
            type    : "POST",
            url     : "index.php",
            data    : { 
                        request    : "getblog_Action"
                      },
            success : function(response) {
                                   alert(response);
                //jQuery(".blog_name").html(response);
                            }
        });  
....

    When ever you call this ajax, you will get blog information using ajax.

  2. There’s actually a whole separate way you need to make Ajax calls within WordPress. [edit: what I mean is, there is a prescribed way; whether you need to follow it religiously or whether there are other ways to skin the cat is another story] There are tutorials aplenty (just do a websearch for “Ajax WordPress” and look for the articles that talk about implementation rather than just now Ajax is used to power its back end).

    The short version is:

    You should be making your calls to a particular handler, ‘admin-ajax.php’ and you should do it with a POST. You pass a data object that looks something like ‘action=someaction&parameter=foo’.

    Then you should have a hook in functions.php for the “someaction” action.

    There’s more to it, but I don’t think this is the best place for a tutorial. Suffice it to say, you need to delve more into it; you can’t just make an Ajax call the way you would with a straight-up markup+JavaScript page.

    But it can be done. Contact forms in WP are often based on Ajax, so they might have sample code worth looking into.

  4. I was recently facing one similar kind of issue as I was unable to call methods with $this->myMethod(), and unable to access variables with $this->myVariable. It seems like class is not being instantiated or may be the ajax method is acting like a static method so $this has no existence within it. Though the class is being instantiated for sure as this method is being called and class constructor is also setting up things.

    The solution I am able to work out with is making my other variables and methods static, and now they were accessible by self::myMethod() and self::$myVariable