Event on Task Deletion OnTaskDelete

If you are developing integrations for Bitrix24 using AI tools (Codex, Claude Code, Cursor), connect to the MCP server so that the assistant can utilize the official REST documentation.

Scope: task

Who can subscribe: any user

The event is triggered after a task is deleted.

Events will not be sent to the application until the installation is complete. Check the application installation

What the handler receives

Data is transmitted as a POST request

array(
            'event' => 'ONTASKDELETE',
            'data' => array(
                'FIELDS_BEFORE' => array('ID' => 123),
                'FIELDS_AFTER' => 'undefined',
                'IS_ACCESSIBLE_BEFORE' => 'undefined',
                'IS_ACCESSIBLE_AFTER' => 'N',
            ),
            'ts' => '1466439714',
            'auth' => array(
                'access_token' => 's6p6eclrvim6da22ft9ch94ekreb52lv',
                'expires_in' => '3600',
                'scope' => 'crm',
                'domain' => 'some-domain.bitrix24.com',
                'server_endpoint' => 'https://oauth.bitrix.info/rest/',
                'status' => 'F',
                'client_endpoint' => 'https://some-domain.bitrix24.com/rest/',
                'member_id' => 'a223c6b3710f85df22e9377d6c4f7553',
                'refresh_token' => '4s386p3q0tr8dy89xvmt96234v3dljg8',
                'application_token' => '51856fefc120afa4b628cc82d3935cce',
                ),
        )

Required parameters are marked with *

Parameter
type

Description

event*
string

Symbolic event code, in this case OnTaskDelete

data*
array

Array with data of the deleted task

ts*
timestamp

Date and time of the event sent from the event queue

auth*
array

Authorization parameters and information about the account where the event occurred

Parameter data[]

Required parameters are marked with *

Name
type

Description

FIELDS_BEFORE*
undefined|object

Fields of the task before the event (detailed description provided below). If there are no available task fields, this field will contain the value undefined

FIELDS_AFTER*
undefined|object

Fields of the task after the event (detailed description provided below). If there are no available task fields, this field will contain the value undefined

IS_ACCESSIBLE_BEFORE*
string

Whether the task was readable before the event (detailed description provided below)

IS_ACCESSIBLE_AFTER*
string

Whether the task became readable after the event (detailed description provided below)

Field FIELDS_BEFORE

Required parameters are marked with *

Name
type

Description

ID*
integer

Identifier of the deleted task

Required parameters are marked with *

Field FIELDS_AFTER

Required parameters are marked with *

Name
type

Description

ID*
integer

Identifier of the deleted task

Field IS_ACCESSIBLE_BEFORE

Required parameters are marked with *

Name
type

Description

IS_ACCESSIBLE_BEFORE*
string

Possible values:

  • Y (Yes) — yes
  • N (No) — no
  • undefined — not defined or check was not performed

Field IS_ACCESSIBLE_AFTER

Required parameters are marked with *

Name
type

Description

IS_ACCESSIBLE_AFTER*
string

Possible values:

  • Y (Yes) — yes
  • N (No) — no
  • undefined — not defined or check was not performed

Code Examples

How to Use Examples in Documentation

try
        {
        	const response = await $b24.callMethod(
        		'event.bind',
        		{
        			"event": "onTaskDelete",
        			"handler": "https://example.com/handler.php"
        		}
        	);
        	
        	const result = response.getData().result;
        	console.info(result);
        }
        catch( error )
        {
        	console.error(error);
        }
        
try {
            $response = $b24Service
                ->core
                ->call(
                    'event.bind',
                    [
                        'event'   => 'onTaskDelete',
                        'handler' => 'https://example.com/handler.php',
                    ]
                );
        
            $result = $response
                ->getResponseData()
                ->getResult();
        
            echo 'Success: ' . print_r($result, true);
            // Your logic for processing data
            processData($result);
        
        } catch (Throwable $e) {
            error_log($e->getMessage());
            echo 'Error binding event: ' . $e->getMessage();
        }
        
BX24.callMethod(
            'event.bind',
            {
                "event": "onTaskDelete",
                "handler": "https://example.com/handler.php"
            },
            function(result) {
                if (result.error()) {
                    console.error(result.error());
                } else {
                    console.info(result.data());
                }
            }
        );
        
require_once('crest.php');
        
        $result = CRest::call(
            'event.bind',
            [
                'event' => 'onTaskDelete',
                'handler' => 'https://example.com/handler.php'
            ]
        );
        
        echo '<PRE>';
        print_r($result);
        echo '</PRE>';

Continue Learning

Previous
When Updating a Task
Next
Overview of Methods