Ajax调用php文件中的外部json对象

Question

I'm trying to parse a json file within an external php file with ajax from a different server (technically the same provider but I don't think it really matters).

Anyway my code in my wordpress website to create a json file from my database is the following:

        <pre>
            <?php


            global $wpdb;
            if(!isset($wpdb))
            {
                require_once('wp-config.php');
                require_once('wp-includes/wp-db.php');
            }

            $result = $wpdb->get_results ( "SELECT * FROM " . $table_prefix . "some_row" );
            print_r(json_encode($result, JSON_UNESCAPED_SLASHES));
            ?>
        </pre>

The url of this file is (example) http://somewebsite.com/phpjson.php .

I'm calling from the other url (example) http://app.someotherwebsite.com in this way:

$(document).ready(function() {
    $(function(){
            $.ajax({
                url: "http://somewebsite.com/phpjson.php",
                type: "GET",
                dataType: "JSON",
                cache: false,
                success: function(markers) {
                   $.each(markers,function(i, val){
                   //do something
              }
    });
});

For some reason, I'm not able to call the file probably because of the format of for something else, any clue?

Answer 1

Several issues:

1. The result of json_encode() is a string, not an array. So instead of using print_r() you should be using echo or print .
2. Wrapping the JSON in <pre> tags invalidates the JSON, so it can't be parsed by jQuery. You should remove the <pre> / </pre> tags.
3. For best results, make sure you set a content-type header before outputting the JSON data: header('Content-Type: application/json'); .

Try that and let us know if it solves the problem.

Answer 2

Check documentation : http://api.jquery.com/jQuery.ajax/

crossDomain (default: false for same-domain requests, true for cross-domain requests)

Type: Boolean

If you wish to force a crossDomain request (such as JSONP) on the same domain, set the value of crossDomain to true. This allows, for example, server-side redirection to another domain. (version added: 1.5)