While in WordPress admin area..\u00a0 the variable named ajaxurl is available for javascript scripts to use for the url for ajax. Every call must at the very least have an “action” data property passed to WordPress in order for it to know which function will be used on the back-end to complete the ajax request.<\/p>\n
\/\/ when in the WordPress admin area. the variable \"ajaxurl\" is available that\r\n\/\/ points to \/wp-admin\/admin-ajax.php which handles all ajax requests.\r\n\r\n\/\/ if the user is not logged in then the ajaxurl is not automatically passed.\r\n\/\/ also wp_ajax_nopriv action must also have the php ajax function tied to it \r\n\/\/ in case the user that is visiting is not logged in.\r\n\r\nvar datasent={\r\n'action':'method_that_handles_the_ajax_request',\r\n'address':'555 street'\r\n};\r\n\r\n\/\/ in this example we manually set a ajaxurl in case the user isn't logged in.\r\n\r\nvar ajaxurltowp=site_vars.ajaxurl; \/\/ passed in from localize wp script \r\n\r\n$.post(ajaxurltowp, datasent,function(response){\r\n\/\/ response is what is sent back from the server for the ajax request.\r\n\r\n});<\/pre>\nThe associated php that would be needed to process above :<\/p>\n
<?php\r\n\r\nfunction handle_request(){\r\n$address=$_POST[\"address\"]; \/\/ grab field sent via ajax\r\n\/\/do something here\r\n\/\/ all functions that handle ajax must die() at the end of the function.\r\ndie();\r\n\r\n}\r\n\r\n\/\/adding action assuming not in a namespace.\r\nadd_action('wp_ajax_method_that_handles_the_ajax_request','handle_request');\r\n\r\n\/\/ adding action for visitors who are no logged in\r\nadd_action('wp_ajax_nopriv_method_that_handles_the_ajax_request','handle_request');\r\n<\/pre>\nAny ajax request must be handles by a function which has to be added via add_action<\/p>\n
Note that any action you specify in the ‘action’ field for the data sent to the server will have ‘wp_ajax_’ prepended to the actions name.<\/p>\n
Also need to bind to the action prefix ‘wp_ajax_nopriv’ so that the ajax will still work for visitors who are not logged in.<\/p>\n
So the action ‘method_that_handles_the_ajax_request’ will have to be added in php as ‘wp_ajax_method_that_handles_the_ajax_request’ as seen in the php snippet.<\/p>\n
If the action can not be found by admin-ajax.php the response returned from the ajax request will be an integer of zero ( 0 ).<\/p>\n
If you created an ajax action method properly and you keep receiving a 0 response…confirm that your ajax action method was added.<\/p>\n
\/\/if were in a namespace would have to do the following:\r\nadd_action('wp_ajax_method_that_handles_the_ajax_request',__NAMESPACE__.'\\\\handle_request');\r\n\r\n\/\/if were in a class would have to do the following:\r\nadd_action('wp_ajax_method_that_handles_the_ajax_request',array($this,'handle_request'));<\/pre>\nAny function in php that handles a ajax request MUST end with die();<\/p>\n
Within the php function, any post variable that is passed via the ajax data field, in our case the ‘address’ or ‘action’ field, is available via $_POST[“address”] or $_POST[“action”]<\/p>\n
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