Implement inbound and outbound events in embeds

Inbound and outbound events enable seamless interactions in embedded solutions by facilitating communications between the embedded content and the host application. For example, when a user clicks an object in the host application, a JavaScript inbound event can enable the embedded Sigma content to display different information.

This document introduces inbound and outbound events and provides examples demonstrating how to use them in Sigma embeds.

📘

Inbound events were previously called "actions". Sigma renamed "actions" to "inbound events" to differentiate between this feature and the workbook actions feature.

Because you can use a variety of methods to implement events, and you may have unique integration requirements, this document doesn't provide step-by-step guidance on implementing events in embeds. Instead, it highlights examples that can provide helpful context that you can leverage as you develop your own approach.

Inbound events

Inbound events are mechanisms through which the host application communicates with the Sigma embed. Essentially, they are variables or commands that Sigma processes and responds to by dynamically modifying control values.

Sigma supports two methods of communicating inbound events:

• JavaScript: Typically utilized to send data from the host application to the embedded content without refreshing the embed. This method enables a more interactive and responsive user experience.
• URL: Primarily utilized at runtime to append variable values directly to the embed URL. This method is ideal for initializing the embed with specific parameters.

Both methods offer flexibility in the transmission of actions, allowing your embedded solution to accommodate different scenarios and requirements.

Example inbound event: Update controls in Sigma

The following example script demonstrates a method of communicating information from the host application to the iframe of the embedded Sigma content. It utilizes the postMessage method to enable communication and allows the host application to send messages directly to the iframe's contentWindow to specify event type and variables to update.

The target origin https://app.sigmacomputing.com enhances security by ensuring the message reaches the intended recipient.

// Get the Sigma iframe element from the document
const sigma_iframe = document.getElementById('sigma-iframe');  

// Post a message to the Sigma iframe's content window
sigma_iframe.contentWindow.postMessage(  
  {  
    // Specify the type of event to perform
    type: 'workbook:variables:update',  

    // Define the variables to update in Sigma, with their new values
    variables: { 'Variable1': 'value1', 'Variable 2': 'value2' },  
  },  

  // Provide the target origin for where the message should be accepted
  'https://app.sigmacomputing.com',  
);

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This example event updates control values currently displayed in the embedded content. It does not apply to hidden controls.

Example inbound event: Change the selected element or page

The following example snippet demonstrates how to programmatically change the selected element or page within an embed. It utilizes the postMessage method to enable communication and allows the host application to send messages that specify the workbook:selectednodeid:update event type and ID of the node to select (the string placeholder value would be replaced with null or an actual node ID).

The target origin is provided to ensure the message is sent to the correct domain.

const sigma_iframe = document.getElementById('sigma-iframe');  
sigma_iframe.contentWindow.postMessage(  
  {  
    type: 'workbook:selectednodeid:update';  
    selectedNodeId: string | null;  
  },  
  '<https://app.sigmacomputing.com'>,  
);

Available inbound events

Sigma supports the following inbound events, which are triggered by user input into the console.

workbook:bookmark:create

This event creates a bookmark without using the embed UI.

Event structure:

{
   type: 'workbook:bookmark:create';
   name: string;
   isDefault: boolean;
   isShared: boolean;
}

Event properties:

workbook:fullscreen:update

This event is used to update the fullscreen search parameter. If the targeted element is maximized, calling this function will minimize it and vice versa. Equivalent to Maximize element in the UI.

This event is useful for maximizing and minimizing elements without using the UI.

Event structure:

{
   type: 'workbook:fullscreen:update';
   nodeId: string | null;
}

Event properties:

workbook:selectednodeid:update

This event is used to select a node ID without using the UI.

Event structure:

{
   type: 'workbook:selectednodeid:update';
   selectedNodeId: string | null;
}

Event properties:

workbook:variables:list

This event is used to get the variables and controls of a workbook.

Event structure:

{  
   type: 'workbook:variables:list' 
}

Will return:

{
   type: 'workbook:variables:current';
   variables: variablesObject;
}

Event properties (returned):

workbook:variables:update

This event is used to update the variables and controls of a workbook without using the UI.

Example call: frame.contentWindow.postMessage({type: "workbook:variables:update", variables: {ua: 'south'}})

{  
   type: 'workbook:variables:update';
   variables: variablesObject 
}

Event properties:

Outbound events and listeners

Outbound events are messages the embedded Sigma content communicates to the host application to provide updates about interactions or changes applied to the content within Sigma. JavaScript event listeners must be implemented for the host application to detect and respond to outbound events. This facilitates the interactivity between the host application and Sigma embed.

Example outbound event: Basic event listener

This first example demonstrates how an event listener can be added to the window object. The listener checks for event messages sent by the Sigma embed and logs the event data.

window.addEventListener('message', function (event) {
  if (event.source === document.getElementById('sigma-iframe').contentWindow &&
      event.origin === "https://app.sigmacomputing.com") {
    // Handle the received event data
    console.log(event.data);
  }
});

Example outbound event: Filter specific event messages

This second example demonstrates how to filter out unrelated event messages (for example, from React DevTools).

window.addEventListener('message', (message) => {
  // Filter out messages not related to Sigma
  if (message.data.source !== 'react-devtools-bridge') {
    console.log(message.data);
  }
});

Available outbound events

Sigma supports the following outbound events that describe user interactions with embedded Sigma content. Each event includes specific properties about the interaction that allow the host application to process and respond accordingly.

url:onchange

This event occurs when the URL path changes, but not when URL search parameters change. This event returns the URL of the embed.

This event gives insight into when the user creates their own workbook that they can edit.

Event structure:

{
   type: 'url:onchange';
   url: string;
}

Event properties:

workbook:bookmark:oncreate

This event occurs when an embed user creates a bookmark using the embed UI.

This event is useful for analyzing when users create their bookmarks.

Event structure:

{
   type: 'workbook:bookmark:oncreate';
   bookmarkName: string;
   workbookId: string;
   versionTagName: string | null;
   bookmarkId: string;
}

Event properties:

workbook:chart:error

This event occurs when a chart produces an error.

This event is useful for detecting errors and taking action in response.

Event structure:

{
   type: 'workbook:chart:error';
   nodeId: string;
   message: string | undefined;
   code: string;
}

Event properties:

workbook:chart:onvalueselect

The workbook\:chart\:onvalueselect event is specifically designed for user interactions with embedded visualization elements, like clicking data points in a bar chart. This event extends beyond the basic interaction details and includes a values object that provides insight about the specific chart component selected.

This event is crucial for applications that must respond to precise user interactions within embedded visualization elements. It offers a nuanced understanding of the chart component a user focuses on and analyzes.

Event structure:

{
   type: 'workbook:chart:onvalueselect';
   nodeId: string;
   title: string;
   values: valuesObject;
}

Event properties:

Example scenario:

A user clicks on a specific bar in a bar chart. The event returns detailed information about that bar, including its category label and value. This enables the host application to provide context-specific responses or further data insights related to that precise interaction.

workbook:dataloaded

This event occurs when a workbook finishes loading its data.

This event is useful for signaling when an iframe finishes loading a Sigma embed.

Event structure:

{  
   type: 'workbook:dataloaded' 
}

Example scenario: When a user exports the workbook as PDF via API immediately after accessing a workbook, they might see in the PDF that the embed element hasn't finished loading. Developers can add a check for iframe elements and check that the iframe contents are fully loaded before exporting.

workbook:error

This event occurs when a workbook produces an error.

This event is useful for detecting errors and taking action in response.

Event structure:

{
   type: 'workbook:error';
   message: string | undefined;
   code: string;
}

Event properties:

workbook:fullscreen:onchange

This event occurs when the user minimizes or maximizes an element.

This event is useful for taking an action in response to an element being minimized/maximized.

Event structure:

{
   type: 'workbook:fullscreen:onchange';
   fullScreen: boolean;
}

Event properties:

workbook:id:onchange

This event occurs when the ID of the displayed workbook changes.

This event gives insight into when the user creates their own workbook that they can edit.

Event structure:

{ 
   type: 'workbook:id:onchange'; 
   id: string 
}

Event properties:

workbook:loaded

This event occurs when a workbook's metadata has loaded, but the elements haven't been evaluated.

This event is crucial for scenarios in which an initial setup or a pre-processing step is required before the workbook becomes interactive. It provides an opportunity to implement any preparatory actions in the host application based on the workbook's metadata.

Event structure:

{
  type: 'workbook:loaded',
  workbook: {
    variables: encodedVariables // Contains workbook metadata
  },
}

workbook:pageheight:onchange

This event communicates the document height to the parent whenever it changes.

This event is useful for avoiding situations where the body of a frame would scroll due to dynamic sizing. Use this function to calculate the height of the iframe.

Event structure:

{
   type: 'workbook:pageheight:onchange';
   pageHeight: number;
}

Event properties:

workbook:pivottable:oncellselect

This event occurs when a user selects a cell or multiple cells in an embedded pivot table. This event provides an array of selected cells and their properties.

This event is crucial for applications that require responsive interaction with pivot table data within Sigma, allowing the host application to tailor its response based on user selection in the embedded workbook.

Event structure:

{
   type: 'workbook:pivottable:oncellselect';
   nodeId: string;
   title: string;
   cells: cellsObject;
}

Event properties:

workbook:published

This event occurs in secure embeds when a user saves and publishes a workbook.

This event is useful for taking some action in the host application when a workbook is published and for tracking when changes are made to a workbook.

Event structure:

{
   type: 'workbook:published';
   workbookId: string;
}

Event properties:

workbook:table:oncellselect

This event occurs when a user selects a cell or multiple cells in an embedded table. This event provides an array of selected cells and their properties.

This event is crucial for applications that require responsive interaction with table data within Sigma, allowing the host application to tailor its response based on user selection in the embedded workbook.

Event structure:

{
   type: 'workbook:table:oncellselect';
   nodeId: string;
   title: string;
   cells: cellsObject;
}

Event properties:

Example scenario:

When a user selects a specific cell (for example, in the Sum of Revenue column) for a particular order, the event returns detailed information about the cell, including its value, column name, and any underlying data (if it's an aggregate value).

workbook:variables:onchange

This event occurs when a user- or system-initiated update is applied to a control or variable within the embedded Sigma content.

This event is essential for situations where the host application needs to respond to changes within the embedded Sigma content. This event provides information about user interactions with the embedded content, allowing for a dynamic and responsive integration within the host application. For detailed examples on how values are encoded for URLs, refer to Apply control values with URL parameters > Directly generate a URL.

Event structure:

{
  type: 'workbook:variables:onchange',
  workbook: {
    variables: { 'Variable1': 'value1', 'Variable 2': 'value2' } // Updated variable values
  },
}

Event properties: