UI Extension Javascript API

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UI Extension Javascript API

To interact with the standard form fields from the Javascript of a UI extension, R-Service offers the UI Extension Javascript API.

All API calls start with ITRP . For example, the API call ITRP.field('note').val(); can be used to get the current value of the Note field of the Request form.

UI Extension Javascript API
- Get initial values
- Distinguish new and existing records
- Distinguish Self Service and Specialist view
- Interact with form fields in Self Service
- Interact with form fields in the Specialist view
- Functions
  - required
  - readonly
  - val
  - data
  - show
  - hide
  - toggle
  - size
  - placeholder
  - on
  - off
  - trigger
- Access attributes of selected items in suggest fields
- Access attributes of selected items via metadata fields of custom views
  - Data types
- Populate suggest fields
- [Other properties of the ITRP object](#Other properties of the ITRP object)
  - ITRP.$

Get initial values

It is possible to get the initial values of a record when it is opened in edit mode. For example, to make the Attachment field required when a request is edited that has the status Assigned, use the following:

JavaScript

if (ITRP.record.initialValues.get('status') === 'assigned') {
  ITRP.field('attachment').required();
}

The general form of this API call is ITRP.record.initialValues.get('field') . The fields that are available depend on the type of the record that the UI extension is linked to, and are the same as those listed in the Collection Fields section of the respective API:

Note: some of the fields are references , such as the team to which a Request is assigned. You can access the reference attributes (usually id and name / subject ) by passing both the name of the reference and the name of the attribute to the API, for example: ITRP.record.initialValues.get('team', 'name') .

Distinguish new and existing records

To find out whether the user is adding a new record, use the following:

JavaScript

// Possible values: true and false
var new_record = ITRP.record.new;
if (new_record) { /* ... */ }

Distinguish Self Service and Specialist view

To find out whether the user is using Self Service or the Specialist view, use the following:

JavaScript

// Possible values: 'self_service' and 'full_ui'
if (ITRP.context === 'self_service') { /* ... */ }

A practical example of this can be found in Advanced UI Extension Examples .

Interact with form fields in Self Service

The Javascript API offers various functions to interact with the built-in form fields of R-Service records. For each type of record and each field, the available functions are listed below. Refer to Functions for descriptions and brief examples of these functions.

Requests

Subject: ITRP.field('subject') - required show hide toggle val
Note: ITRP.field('note') - required show hide toggle val placeholder
Attachments: ITRP.field('attachment') - required show hide toggle size
Asset: ITRP.field('asset') - required show hide toggle val
Service instance: ITRP.field('service_instance') - val (read only) on off data

Note that the fields Subject and Asset can only be interacted with when the user is registering a new request.

The field Asset can only be interacted with when the user is registering a request based on a template with the option Asset selection in Self Service enabled.

Tasks

Attachments: ITRP.field('attachment') - required show hide toggle size
Status: ITRP.field('status') - val on off trigger

Project Tasks

Attachments: ITRP.field('attachment') - required show hide toggle size
Status: ITRP.field('status') - val on off trigger

Interact with form fields in the Specialist view

The Javascript API offers various functions to interact with the form fields of records that are available in the Specialist view. For each type of record and each field, the available functions are listed below. Refer to Functions for descriptions and brief examples of these functions.

Requests

Subject: ITRP.field('subject') - val
Note: ITRP.field('note') - val placeholder
Attachments: ITRP.field('attachment') - required show hide toggle size
Internal note: ITRP.field('internal_note') - val
Internal attachments: ITRP.field('internal_attachment') - required show hide toggle size
Configuration items: ITRP.field('asset') - required
Impact: ITRP.field('impact') - val on off trigger
Status: ITRP.field('status') - val on off trigger
Service instance: ITRP.field('service_instance') - val (read only) on off data

Tasks

Attachments: ITRP.field('attachment') - required show hide toggle size
Impact: ITRP.field('impact') - val on off trigger
Status: ITRP.field('status') - val on off trigger
Configuration items: ITRP.field('asset') - required

Project Tasks

Attachments: ITRP.field('attachment') - required show hide toggle size
Status: ITRP.field('status') - val on off trigger

Problems

Attachments: ITRP.field('attachment') - required show hide toggle size
Impact: ITRP.field('impact') - val on off trigger
Status: ITRP.field('status') - val on off trigger
Configuration items: ITRP.field('asset') - required

Configuration Items

Status: ITRP.field('status') - val on off trigger
System ID: ITRP.field('systemID') - val required on off trigger
Service: ITRP.field('service') - required
Site: ITRP.field('site') - val required on off trigger
Location: ITRP.field('location') - val required on off trigger
Remarks: ITRP.field('remarks') - val required on off trigger
Attachments: ITRP.field('attachments') - required
Nr. of processors: ITRP.field('nr_of_processors') - val required on off trigger
Nr. of cores: ITRP.field('nr_of_cores') - val required on off trigger
Nr. of licenses: ITRP.field('nr_of_licenses') - val required on off trigger
Service instances: ITRP.field('service_instances') - required
Users: ITRP.field('users') - required
Product: ITRP.field('product') - val on off trigger
Rule set: ITRP.field('rule_set') - val (read only)
Configuration items: ITRP.field('ci_relations') - required
Contracts: ITRP.field('contracts') - required
Supplier: ITRP.field('supplier') - val required on off trigger
Serial number: ITRP.field('serial_nr') - val required on off trigger
Financial owner: ITRP.field('financial_owner') - val required on off trigger
PO number: ITRP.field('po_nr') - val required on off trigger
Asset ID: ITRP.field('assetID') - val required on off trigger
Depreciation method: ITRP.field('depreciation_method') - val required on off trigger
In use since: ITRP.field('in_use_since') - val required on off trigger
Warranty expiry date: ITRP.field('warranty_expiry_date') - val required on off trigger

Risks

Status: ITRP.field('status') - val on off trigger
Mitigation target: ITRP.field('mitigation_target_at') - val required readonly show hide toggle on off trigger
Severity: ITRP.field('severity') - val required readonly show hide toggle on off trigger
Closure reason: ITRP.field('closure_reason') - val on off trigger

Functions

`required`

Use this function to make a field optional or required.

JavaScript

ITRP.field('note').required(); // Make the Note field required
ITRP.field('note').required(true); // Make the Note field required
ITRP.field('note').required(false); // Make the Note field optional

`readonly`

Use this function to make a field readonly or read/write.

JavaScript

ITRP.field('severity').readonly(); // Make the Severity field readonly
ITRP.field('severity').readonly(true); // Make the Severity field readonly
ITRP.field('severity').readonly(false); // Make the Severity field read/write

`val`

Use this function to get or set the value of a field.

JavaScript

// Get the value of the Subject field:
var value = ITRP.field('subject').val();

// Set the value of the Subject field to 'New subject':
ITRP.field('subject').val('New subject');

// Clear the value of the Subject field:
ITRP.field('subject').val('');

// Fill a rich text field with HTML:
ITRP.field('note').val({ html: 'This is <b>bold</b> text.' });

`data`

Use this function to get additional attributes of a field.

JavaScript

var si_details = ITRP.field('service_instance').data('item');
var si_id = si_details.id; // ID of service instance, same as: ITRP.field('service_instance').val()
var si_name = si_details.name; // Name of service instance
var service_id = si_details.service.id; // ID of service related to service instance
var service_name = si_details.service.name; // Name of service related to service instance

`show`

Use this function to make a hidden field visible.

JavaScript

ITRP.field('note').show(); // Show the note field

`hide`

Use this function to hide a field.

JavaScript

ITRP.field('note').hide(); // Hide the note field

`toggle`

Use this function to toggle the visibility of a field.

JavaScript

ITRP.field('note').toggle(true); // Show the note field
ITRP.field('note').toggle(false); // Hide the note field

`size`

Use this function to get the number of attached files.

JavaScript

var size = ITRP.field('attachment').size();
if (size < 2) { /* ... */ }

`placeholder`

Use this function to set the placeholder of the note field.

JavaScript

ITRP.field('note').placeholder('Describe your request here…');

`on`

Use this function to attach an event handler to a field. It is based on the jQuery on() function and takes two required parameters:

event type : the type of event that should be handled, such as change , click , or focus .
handler function : the function that should be called when events of the given event type occur.

JavaScript

// Make the Remarks field required
// when the Status is changed to 'In Production'
ITRP.field('status').on('change', function() {
  var status = ITRP.field('status').val();
  ITRP.field('remarks').required(status === 'in_production');
});

`off`

Use this function to remove an event handler from a field. It is based on the jQuery off() function and takes two required parameters:

event type : the type of event that should no longer be handled, such as change .
handler function : the handler function that was previously attached via the on function. Note that this should be the same function.

JavaScript

var set_remarks_value = function() {
  if (ITRP.field('status').val() === 'being_repaired') {
    ITRP.field('remarks').val('Describe what needs to be repaired:');
    // Make sure that the value of the remarks field is only filled in
    // the first time the status is set to 'Being Repaired':
    ITRP.field('status').off('change', set_remarks_value);
  }
};

ITRP.field('status').on('change', set_remarks_value);

`trigger`

Use this function to manually trigger an event. It is based on the jQuery trigger() function and takes one parameter:

event type : the type of event that should be triggered, such as change .

JavaScript

// Do something when the user changes the status field to another value:
ITRP.field('status').on('change', function() { /* do something ... */ });

// Make sure that the action defined above is also performed
// when the form is initially displayed:
ITRP.field('status').trigger('change');

// The two statements above can also be combined, as follows.
// This is a common pattern when attaching an event handler.
ITRP.field('status').on('change', function() {
  /* do something ... */
}).trigger('change');

Access attributes of selected items in suggest fields

When a custom field is a suggest field (for example a organization-suggest or a custom-suggest ), calling .val() on the field returns the ID of the selected item. You may need something else to happen depending on the selected item. For example: another field should be shown only when a certain item was selected, as described in the Advanced UI Extension Examples . However, using the ID of the selected item in Javascript may not be desirable, because it makes it more difficult to synchronize UI Extensions between the R-Service QA and Production environment.

To help with this use case, it is possible to access some of the attributes of the selected item.

When the suggest field allows the selection of a single value, use .data('item') to access these attributes.

When the suggest field allows the selection of multiple values, use .data('items') to get an array of selected items.

The following attributes of an item are available by default:

id
display_name : this is the name or subject of the item as it is displayed on the screen. In some cases the display_name can be a combination of multiple attributes. For example, the display_name of a CI is a combination of the Label and Name attribute.
reference : only available for record types that have a Reference field, such as custom collection elements.

JavaScript

if ($color.data('item').reference === 'orange') { /* do something ... */ }

var is_orange = function(item) { return item.reference === 'orange'; };
if ($colors.data('items').filter(is_orange).length > 0) { /* do something ... */ }

Access attributes of selected items via metadata fields of custom views

In addition to the standard attributes listed in the previous section, custom-suggest fields can expose additional attributes of items by adding these attributes to the ‘Metadata fields’ field of the Custom View , that the custom-suggest is based on.

For example, suppose you have created a custom view on Configuration Items and added the field assetID and two custom fields called Battery Level and Cost Center to its Metadata fields. The custom field Cost Center refers to a custom collection element.

These metadata fields can then be accessed in the same way as the standard attributes described in the previous section:

JavaScript

var assetID = $my_ci.data('item').assetID;
var assetIDs = $my_cis.data('items').map(function(item) { return item.assetID; });

var batteryLevel = $my_ci.data('item').custom_fields['Battery Level'];
var batteryLevels = $my_cis.data('items').map(function(item) { return item.custom_fields['Battery Level']; });

var costCenter = $my_ci.data('item').custom_fields['Cost Center'];
var costCenterId = costCenter.id;
var costCenterName = costCenter.display_name;
var costCenterReference = costCenter.reference;

A practical example is included in the Advanced UI Extension Examples .

Warning : Be careful when exposing metadata fields containing sensitive information. Suppose a custom-suggest is included as a public custom field in a request template offered to end users. These end users will then be able to obtain the metadata fields of all possible values of the custom-suggest .

Data types

The representation of the exposed data depends on the data type of the metadata field.

Dates and timestamps: ISO8601 representation of the date(and/or time) in the UTC time zone, e.g. 2022-03-22T12:22:53Z . Examples: the created_at and in_use_since fields of Configuration Items .
Enumerations : the id of the enumerated value, e.g. undergoing_maintenance . Examples: the status and rule_set fields of Configuration Items .
Booleans: as-is (i.e. true or false ). Examples: the site_license and temporary_license fields of Configuration Items .
Numerical values (integer / decimal): as-is. Examples: the rate and salvage_value fields of Products .
Strings: as-is. Examples: the name , label and assetID fields of Configuration Items .
References to a record: a hash containing id and display_name , e.g. { id: 16, display_name: 'End-User Support, Houston' } . Also includes reference for record types that have a Reference field, such as custom collection elements. Examples: the product and support_team fields of Configuration Items .

Populate suggest fields

As explained in the previous paragraph, when a custom field is a suggest field (for example a organization-suggest or a custom-suggest ), calling .val() on the field returns the ID of the selected item. To populate a suggest field with a value, you can also use the .val() function. The examples below illustrate how this works.

JavaScript

// Set the value of a suggest field based on the ID of a record:
// ('123456' is the ID of a person record in R-Service)
$level_1_approver.val(123456);

// Set the value of a suggest field that allows multiple values:
$level_2_approvers.val([123456, 987654]);

// When the suggest field is a custom-suggest
// based on custom collection elements,
// you can also use the reference of the custom collection element:
$cost_center.val({ reference: "cost-center-a" });

// And if the custom-suggest allows multiple values:
$cost_centers.val({ reference: ["cost-center-a", "cost-center-b"] });

Other properties of the ITRP object

ITRP.$

You can use jQuery in the Javascript of UI Extensions. Access the jQuery API via ITRP.$.

Note that the Javascript of every new UI extension starts with the lines:

var $ = ITRP.$;
var $extension = $(this);

The $extension variable is then used to select fields of the UI extension, add event handlers, and so on:

$extension.find('#my_field').on('change', function() {
  ...
});

ITRP.hasFormData() and ITRP.clearFormData()

The functions ITRP.hasFormData and ITRP.clearFormData are used to interact with all form elements in a given scope:

// hasData will be true if any form element in the $extension scope has a value
var hasData = ITRP.hasFormData($extension);
if (hasData) {
  // Do something
}

var $my_button = $extension.find('#my_button');
$my_button.on('click', function() {
  // Clears all form elements in the $extension scope.
  ITRP.clearFormData($extension);
});

A practical example using both of these functions is given on the Advanced UI Extension Examples page.

The after-prefill hook

The after-prefill hook can be used to execute a JavaScript function that should run after all form elements have been prefilled when editing a record.

When editing an existing record with custom fields, R-Service performs a few technical steps:

Load the form HTML, including the HTML of the UI extension. At this point, all the UI extension form elements are present, but still empty.
Load and execute the R-Service JavaScript.
Load and execute the JavaScript of the UI extension.
Fill the form elements of the UI extension with the custom field values.
Trigger the after-prefill hook.

The following JavaScript snippet illustrates this:

var $my_field = $extension.find('#my_field');

// This statement is executed in step 3
console.log("Value in step 3: " + $my_field.val());

ITRP.hooks.register('after-prefill', function() {
  // This statement is executed in step 5
  console.log("Value in step 5: " + $my_field.val());
});

Suppose that you are editing a request in which the custom field my_field has the value Test. The above snippet will then output the following lines to the developer console of the browser:

Value in step 3:
Value in step 5: Test