---
sourceDocument: Australia Build or modify applications
sourceDocumentLink: https://www.servicenow.com/docs/r/application-development
Release :
- australia
ft:locale :
- en-US
ft:publication_title :
- Australia Build or modify applications
ft:clusterId :
- cadev
bundleId :
- cadev
workflow :
- Development, Data, and Analytics
---
# Create custom components to reuse across pages with component builder
# Create custom components to reuse across pages with component builder {#ariaid-title1}
* Release version: Australia
*
* Updated March 12, 2026
*
*  10 minutes to read
Reuse custom components across experiences and pages in UI Builder.
Create custom components in UI Builder's component building UI. The component building UI shares many similarities to page building and enables you to configure components the same way you would when configuring a page in UI Builder.
## The power of custom components {#component-builder__section_esp_gyn_nfc}
Building custom components improves efficiency, consistency, and maintainability across your experience. By creating reusable UI elements, you avoid duplicating configurations, ensure a uniform look and feel, and make it easier to
manage updates or design changes. Custom components also simplify complex layouts, support flexible configurations, and enable for easier testing and debugging. They're also helpful in team environments, where shared components help
streamline collaboration and keep the user experience consistent at scale.
Custom components are especially valuable when designing pages for different user types within your experience. For example, you can create a reusable component that includes both a list and a data visualization, then tailor its
content or behavior based on the user group enabling you to maintain a consistent layout while delivering role-specific information.
Components edited in the Component Builder will automatically update on all pages where they are used.
Important:
Custom components created in an instance remain available only within that instance until they are migrated to other instances using update sets or application installations.
## Custom components or page collections {#component-builder__section_yd3_hyn_nfc}
To build efficient, scalable digital experiences, it's important to reuse elements wherever possible. Two ways to do this are through custom components and page collections. Each serves a distinct purpose depending on the scope of
reuse that you need.
Custom Components
: Use custom components when you want to replicate a specific part of a page like a heading, list, form, or buttons across multiple pages.
: You want to apply a consistent theme or configuration to a component or group of components.
: You're designing pages to be modular or flexible where parts of a page may change but shared components remain consistent.
: You want to manage changes in one place and have them updated everywhere the component is used.
: Multiple teams are simultaneously working on different sections of the same page.
Page Collections
: You want to reuse an entire page layout and configuration across multiple pages or experiences.
: You must build a variation of full pages for different users or workflows.
: You want to use a set of tabs across multiple pages or experiences.
## Custom component UI {#component-builder__section_wvx_2jd_4fc}
You can access the component builder in UI Builder by selecting Create in the header or the Component tile on the UI Builder home page.
Figure 1. UI Builder home page Figure 2. Component Builder UI
Components built with UI Builder can be found in the toolbox when adding a component to a page and in the component list on the home page of UI Builder. You can update or modify custom components by locating it in the components list on the home page of UI Builder.
Figure 3. Test Values in Component Builder
Use test values in component builder to supply simulated values for required and optional URL parameters when building a custom component. Test values help validate how a component will act when added to a page by ensuring bindings
and data resources are functioning correctly. For more information about test values see, [Test values in a page](https://www.servicenow.com/docs/FNwMv01_cMGEquCPAtNZ7Q "Add test values to your URL as a way to bring test data into a page.").
Figure 4. Component List
You can quickly duplicate a custom component from the component settings screen by selecting Duplicate, which creates an exact copy of the component for reuse or modification.
Figure 5. Custom Component Settings
## Component Builder vs NOW CLI Component Development {#component-builder__section_jxr_hzh_qfc}
There are two ways to build components for UI Builder. The first is using the low-code component within UI Builder, which offers a drag-and-drop interface for creating custom components. The second is using [NOW CLI developer tools](https://developer.servicenow.com/dev.do#!/reference/next-experience/yokohama/cli/getting-started) to build components through code. Both methods produce components that can be added to the UIB toolbox and reused across experiences. Keep in mind that changes to included components
may impact both types.
Although both tools create components for UI Builder, there are important differences to consider.
Component Builder in UI Builder:
* Components built within UI Builder can reference controllers and data resources.
* Creates "Macroponent Components," which are stored in the sys_ux_macroponent table.
* Component Builder is ideal for users who prefer a visual, drag-and-drop interface for building components.
* Great for quickly creating simple to moderately complex components.
{#component-builder__ul_b1s_gb3_qfc}
NOW CLI components:
* Intended for developers who need to write custom HTML, CSS, and JavaScript.
* Suitable for building complex and customizable components.
* Components created with NOW CLI are stored in the sys_uib_toolbox_component table.
{#component-builder__ul_kzs_l13_qfc}
## Best practices {#component-builder__section_bdm_fdw_nfc}
The UI Builder custom component builder lacks governance capabilities and can lead to duplication and inconsistency in your experience. Teams may create similar components with slight variations, resulting in a
fragmented UI, and confusing user experience. It is recommended that your team completes regular audits and cross-team communication to maintain alignment and avoid fragmentation as your experiences grows.
All components are designed to be upgrade safe, as long as their security policy is set to read_only. This provides greater upgrade protection for larger components or page partials compared to other deployable
units like bundles and page templates. However, this also means that out-of-the-box (OOTB) components may not be editable.
## Create components to reuse across pages {#ariaid-title2}
Build reusable custom components to use across experiences and pages in UI Builder.
### Before you begin
Role required: ui_builder_admin
### About this task
In this Component Builder example, we will create a stopwatch component to track elapsed time, which can be added to any page. The component will include customizable properties that can be modified once it's placed onto a
page.
### Procedure
1. Navigate to AllNow Experience FrameworkUI Builder.
2. Select Create from the UI Builder home page.
3. Select Component.
4. In the form, fill in the fields.
Figure 6. Create a component dialog box {#create-components-reuse__table_mn1_ytg_wnb__entry__2}
| Field | Description |
|-|-|
| Name | Add a name to track your component internally. The component name appears in the toolbox. For this example, it is Stopwatch. |
| Categories | Add a category to your component to help easily find it in the toolbox. You can update the category later in the Settings. For this example select Content. |
| Description | Add description to describe when and how to use your component. |
| Icon | Select an icon to represent the component in the toolbox. |
[Table 1. Create a component form]
{#create-components-reuse__table_mn1_ytg_wnb}
5. Select Create.
The page opens in Component Builder view.
6. Add a custom component property by selecting + Add property in the Properties and policy section.
1. Select String from the list.
2. Enter the following values in the configuration panel.
{#create-components-reuse__table_iks_cpk_1gc__entry__2}
| Field | Value |
|-|-|
| Property label | SVG Image Source |
| Property ID | svgImageSource |
| Default value | animateddino.svg |
[Table 2. Component properties]
{#create-components-reuse__table_iks_cpk_1gc}
3. Select Save.
{#create-components-reuse__substeps_owk_xj3_zfc}
7. Configure the layout for the custom component by selecting the + Add Content button.
1. Select Single column, then select Add.
2. In the content tree, under Column 1, select +Add content.
3. Select Card Base Container, then select Add.
4. In the content tree, under Card Base Container 1, select + Add content.
5. Select Layouts.
6. Select Flexbox, then select Add.
7. Select Save.
{#create-components-reuse__substeps_hd2_2l3_zfc}
8. Add a stylized text component in our Flexbox container by selecting + Add content under Container 1.
1. Select the Stylized text component, then select Add.
2. Select Cancel to close the preset window.
3. Select Save.
{#create-components-reuse__substeps_j41_f43_zfc}
9. To configure the stylized text component we will add some client state parameters.
1. Select Client state parameters in the Data and scripts section.
2. In the Edit client state parameters dialog, enter the following values:
{#create-components-reuse__table_ndd_b2g_bgc__entry__3}
| Name | Type | Initial value |
|-|-|-|
| startTime | Number | |
| elapsedTime | String | 00:00:00 |
| timeinterval | JSON | |
| stopwatchRunning | Boolean | |
| intervalId | String | |
[Table 3. Client state parameters]
{#create-components-reuse__table_ndd_b2g_bgc}
3. Select Apply.
4. Select Save.
{#create-components-reuse__substeps_zpt_xjp_zfc}
10. To configure the stylized text component we are going to bind the elapsedTime client state parameter.
1. Select the Stylized text 1 component in the content tree.
2. Select the bind icon when pointing to the Text field of the stylized text component.
3. Select Client states.
4. Double-click the elapsedTime pill.
5. Select Apply.
6. Select Save.
11. Add a Flexbox container to hold the buttons.
1. Select the + icon under the stylized text component.
2. Select Layouts.
3. Select Flexbox.
4. Select Add.
{#create-components-reuse__substeps_ow3_nsp_zfc}
12. Add and configure the stopwatch running renderer and the start button.
1. Select + Add content in the container you added in the previous step and add a Conditional renderer.
2. Select + Add condition in the content tree.
3. Select Single component, then select Next.
4. Select Button iconic, then select Next.
5. In the Edit settings dialog, enter the following values:
* Component label: Start
* Component ID: start_button
* Render content: Always
{#create-components-reuse__ul_nks_gxx_bgc}
6. Select Apply.
7. Select the Start button in the content tree.
8. Set the following properties in the configuration panel.
{#create-components-reuse__table_pvs_xvx_bgc__entry__2}
| Field | Value |
|-|-|
| Icon | stopwatch-fill |
| Variant | Primary |
| Size | Large |
| Tooltip text | Start |
[Table 4. Component properties]
{#create-components-reuse__table_pvs_xvx_bgc}
9. Select Save.
{#create-components-reuse__substeps_zjy_1zm_bgc}
13. Configure the stop button to display while the stopwatch is running.
1. Select + Add condition in the content tree.
2. Select Empty container, then select Next.
3. In the Edit settings dialog, enter the following values:
* Component label: Running
* Component ID: running_container
* Render content: When condition below is true
{#create-components-reuse__ul_ilr_4yx_bgc}
4. Select the bind icon while pointing at the Condition field.
5. Select Client states, then double-click the stopwatchRunning pill.
6. Select Apply.
7. Select Apply.
8. Select + Add content in the Running container and add a Button iconic.
9. Select Button iconic 1 in the configuration panel and enter the following values:
* Component label: Stop
* Component ID: stop_button
{#create-components-reuse__ul_u22_szx_bgc}
10. Select Apply.
11. Set the following properties in the configuration panel.
{#create-components-reuse__table_acn_1zx_bgc__entry__2}
| Field | Value |
|-|-|
| Icon | stopwatch-fill |
| Variant | Secondary |
| Size | Large |
| Tooltip text | Stop |
[Table 5. Component properties]
{#create-components-reuse__table_acn_1zx_bgc}
12. Select Save.
{#create-components-reuse__substeps_ltq_2nv_zfc}
14. Reorder the conditions so that Running appears above Start.
1. Select Conditional renderer 1 in the content tree.
2. In the configuration panel, select and drag the drag handle icon ![]() to move the conditions into position.
Conditions are evaluated in order from top to bottom, so Running must appear above Start for the buttons to display correctly.
{#create-components-reuse__substeps_ajh_hyv_bgc}
15. Add the logic for the component by selecting + next to Client scripts in the Data and scripts section.
1. Enter Start in the Script name field.
2. Paste the following script into the script field.
function handler({ api, helpers }) {
console.log('Start script running');
if (api.state.stopwatchRunning === undefined) {
api.setState('stopwatchRunning', false);
api.setState('elapsedTime', '00:00:00');
api.setState('startTime', null);
api.setState('intervalId', null);
}
let running = api.state.stopwatchRunning;
function pad(n) {
return n < 10 ? '0' + n : n.toString();
}
function updateElapsedTime(startTime) {
if (!running) {
if (api.state.intervalId) {
helpers.timing.clearInterval(api.state.intervalId);
api.setState('intervalId', null);
console.log('Interval cleared');
}
return;
}
if (!startTime) {
console.log('No startTime passed to updateElapsedTime, cannot update');
return;
}
const now = Date.now();
const elapsedMs = now - startTime;
const totalSeconds = Math.floor(elapsedMs / 1000);
const hours = pad(Math.floor(totalSeconds / 3600));
const minutes = pad(Math.floor((totalSeconds % 3600) / 60));
const seconds = pad(totalSeconds % 60);
const formattedTime = `${hours}:${minutes}:${seconds}`;
console.log('Setting elapsedTime:', formattedTime);
api.setState('elapsedTime', formattedTime);
}
if (!running) {
const now = Date.now();
api.setState('startTime', now);
api.setState('elapsedTime', '00:00:00');
api.setState('stopwatchRunning', true);
running = true;
if (api.state.intervalId) {
helpers.timing.clearInterval(api.state.intervalId);
api.setState('intervalId', null);
console.log('Existing interval cleared before starting new one');
}
// Pass startTime directly here
updateElapsedTime(now);
const id = helpers.timing.setInterval(() => {
updateElapsedTime(now);
}, 1000);
api.setState('intervalId', id);
console.log('Interval started with id:', id);
} else {
if (!api.state.intervalId) {
// Use existing startTime from state, but be mindful it might still lag
const storedStartTime = api.state.startTime || Date.now();
const id = helpers.timing.setInterval(() => {
updateElapsedTime(storedStartTime);
}, 1000);
api.setState('intervalId', id);
console.log('Interval restarted with id:', id);
}
}
}
3. Select Apply.
4. Select + next to Client scripts to add a second script.
5. Enter Stop in the Script name field.
6. Paste the following script into the script field.
function handler({ api, helpers }) {
console.log('Stop script running');
if (api.state.stopwatchRunning === undefined) {
// If state is not initialized yet, initialize it to avoid errors
api.setState('stopwatchRunning', false);
api.setState('elapsedTime', '00:00:00');
api.setState('startTime', 0);
api.setState('intervalId', null);
}
if (api.state.stopwatchRunning) {
api.setState('stopwatchRunning', false);
if (api.state.intervalId) {
helpers.timing.clearInterval(api.state.intervalId);
api.setState('intervalId', null);
}
}
}
7. Select Apply.
8. Select Save.
16. Add event handlers to the buttons we created in the previous steps.
1. Select the Start button in the content tree and open the Events tab in the configuration panel.
2. Select Add handler under Button iconic clicked, then select the Start client script we created in the previous steps.
3. Select Continue, then select Add.
4. Select the Stop button in the content tree and open the Events tab in the configuration panel.
5. Select Add handler, then select the Stop client script we created in the previous steps.
6. Select Continue, then select Add.
7. Select Save.
17. Select Preview to test the configured components.
### Result
Your custom component is now available in the UI Builder toolbox.
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