Canvas Data API

Canvas Data API provides a possibility to programmatically read and change field values from extensions. This API works with data from UI only and doesn't directly interact with AEM instance. However, the data manipulations done using this API may be auto-saved by UI itself.

Getting values from canvas

const api = await guestConnection.host.dataApi.get();
const fields = await api.getFields();
console.log(fields);
/**
 * [
 *   {
 *       "name": "test-textarea",
 *       "value": {
 *           "contentType": "text/html",
 *           "value": "<p>Text area content</p>"
 *       },
 *       "type": "text-multi",
 *       "isMultiField": false
 *   },
 *   {
 *       "name": "onelinetext",
 *       "value": "Test one line content",
 *       "type": "text-single",
 *       "isMultiField": false
 *   }
 * ]
 */
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const api = await guestConnection.host.dataApi.get();
const fields = await api.getFields();
console.log(fields);
/**
 * [
 *   {
 *       "name": "test-textarea",
 *       "value": {
 *           "contentType": "text/html",
 *           "value": "<p>Text area content</p>"
 *       },
 *       "type": "text-multi",
 *       "isMultiField": false
 *   },
 *   {
 *       "name": "onelinetext",
 *       "value": "Test one line content",
 *       "type": "text-single",
 *       "isMultiField": false
 *   }
 * ]
 */

Setting new values

const api = await guestConnection.host.dataApi.get();
const fieldName = "test-field";
await api.setValue(fieldName, "New value");
//await api.setValue(fieldName, "New value", 0); - A last parameter specifies an index in multi-field values
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const api = await guestConnection.host.dataApi.get();
const fieldName = "test-field";
await api.setValue(fieldName, "New value");
//await api.setValue(fieldName, "New value", 0); - A last parameter specifies an index in multi-field values

Setting styles to the field

const api = await guestConnection.host.dataApi.get();
const fieldName = "test-field";
await api.setStyle(fieldName, {"display": "none"});
// Second parameter is the object that is used to pass the styles that will be applied on field
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const api = await guestConnection.host.dataApi.get();
const fieldName = "test-field";
await api.setStyle(fieldName, {"display": "none"});
// Second parameter is the object that is used to pass the styles that will be applied on field

Consistency

guestConnection.host.dataApi.get() makes a snapshot of canvas data at the moment of invocation. Changes made by other extensions or direct users will not be automatically propagated to existing API instances. Consider calling this method multiple times during long-running processes to get fresh data.

API Reference

Field format

Field	Type	Required	Description
name	`string`	✔️	A unique field name that could be used as id
value	`string` \| `Object` \| `number` \| `boolean`	✔️	A field value. The type is dependent on field type
type	`string`	✔️	A field type
isMultiField	`boolean`		A flag representing wether field contains multiple values or not

Field types

Type	Value format	Description
`text-signle`	`string`	A single line text field
`text-multi`	`object`	A multi line text field. Object structure: { "contentType": `string`, "value": `string`}. Allowed types are `text/x-markdown`, `text/plain`, `text/html`
`boolean`	`boolean`	A boolean field
`date`	`string`	A date or time field in ISO 8601 format
`number`	`number`	A number field
`enumeration`	`string`	A selected option from the list of allowed values
`json`	`string`	A code block field with JSON code
`tags`	`string[]`	A tags field