Upload Images on demand

The dynamic action initilizes the plug-in upload and update workflow on the end-user request. Depending on the plug-in upload and update workflow result, the JavaScript callbacks done, cancel and fail are executed.

Live demo

Test the plug-in dynamic action upload images on demand in the plug-in sample application example page.

Action Attributes

Pre-requisites

The guidelines describing dynamic action configuration (dynamic action event, triggering element and affected elements) are described in parent document Actions on demand.

Settings

Attribute	Type	Description
Action	Select list	Must be set to Upload images

Initialization JavaScript Code

The dynamic action attribute Initialization JavaScript Code is used to define anonymouse function returning callbacks to be executed, once the plug-in upload and update workflow finishes processing images.

The JavaScript callbacks must be defined using the dynamic action standard attribute Initialization JavaScript Code. The anonymous function accepts only one argument: empty JSON object {}. The function must return JSON object with optional callback functions named start, done, cancel or fail.

Syntax

Callback functions accepts only one argument pItemName referencing a page item name implementing the plug-in.

function( pCallbaacks ){
  pCallbaacks.start  = function( pItemName ){};
  pCallbaacks.done   = function( pItemName ){};
  pCallbaacks.cancel = function( pItemName ){};
  pCallbaacks.fail   = function( pItemName ){};

  return pCallbaacks;
}

Example

The example code below triggers custom event:

• uploadstart when the upload and update workflow starts processing a document,
• uploaddone when the upload and update workflow finishes processing a document,
• uploadcanceled when the workflow is canceled either by end-user or the plug-in,
• uploadfail when unexpected JavaScript or PL/SQL error is raised.

Initialization JavaScript Code (Dynamic Action)

function( pCallbaacks ){
  pCallbaacks.start = function( pItemName ){
    apex.event.trigger(apex.item(pItemName).node, 'uploadstart');
  };

  pCallbaacks.done = function( pItemName ){
    apex.event.trigger(apex.item(pItemName).node, 'uploaddone');
  };

  pCallbaacks.cancel = function( pItemName ){
    apex.event.trigger(apex.item(pItemName).node, 'uploadcanceled');
  };

  pCallbaacks.fail = function( pItemName ){
    apex.event.trigger(apex.item(pItemName).node, 'uploadfailed');
  };

  return pCallbaacks;
}

JavaScript Events

So far, the action doesn't trigger any dynamic action specific JavaScript events.