> For the complete documentation index, see [llms.txt](https://docs.eximee.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.eximee.com/documentation/documentation-en/budowanie-aplikacji/interfejs-uzytkownika/formularze/praca-z-komponentami-bazowymi/zasilanie-wartosciami-z-zewnetrznych-zrodel.md).

# Populating values from external sources

**External Data Source (External Data Source, EDS)** is an Eximee mechanism that allows form components to be powered with data coming from outside the form itself (e.g., from backend services or dictionaries). Thanks to EDS, components can dynamically fetch and display current information while filling out the application, instead of relying solely on statically defined values.

For components, we can define the following external data sources:

| Source type                | Source description                                                                                                                                                                                                                                                                                                                                 |
| -------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| **DICTIONARY**             | Data fed from a dictionary. Description in: [Attaching a dictionary data source](/documentation/documentation-en/budowanie-aplikacji/interfejs-uzytkownika/formularze/praca-z-komponentami-bazowymi/zasilanie-wartosciami-z-zewnetrznych-zrodel/podpiecie-slownikowego-zrodla-danych.md).                                                          |
| **ENTRY\_SERVICE**         | Service for the application. Description in: [Example of plugging it into a page or application service component](/documentation/documentation-en/budowanie-aplikacji/interfejs-uzytkownika/formularze/praca-z-komponentami-bazowymi/zasilanie-wartosciami-z-zewnetrznych-zrodel/podpiecie-uslugi-na-poziomie-strony-lub-calego-wniosku.md).      |
| **EXIT\_SERVICE**          | Service for the application. Description in: Example of plugging it into a page or application service component.                                                                                                                                                                                                                                  |
| **EXTERNAL\_SECTION**      | Service corresponding to the contents of a section for direct embedding in the application.                                                                                                                                                                                                                                                        |
| **PAGE\_SERVICE**          | Service for the application page. Description in: [Example of plugging it into a page or application service component](/documentation/documentation-en/budowanie-aplikacji/interfejs-uzytkownika/formularze/praca-z-komponentami-bazowymi/zasilanie-wartosciami-z-zewnetrznych-zrodel/podpiecie-uslugi-na-poziomie-strony-lub-calego-wniosku.md). |
| **SERVICE**                | Service corresponding to a key-value map of values. Description in: [Example of attaching the service in the component](/documentation/documentation-en/budowanie-aplikacji/interfejs-uzytkownika/formularze/praca-z-komponentami-bazowymi/zasilanie-wartosciami-z-zewnetrznych-zrodel/przyklad-podpiecia-w-komponencie-uslugi.md).                |
| **SUGGESTER\_SERVICE**     | <p>Suggester (description in: <a href="/pages/e818e37fe0802508312996067a878530015709ad">Suggester integration</a>). Available only for the Text Field component.</p><p>The availability of functionality depends on the license and may not be available in all deployments.</p>                                                                   |
| **UNPARK\_ENTRY\_SERVICE** | Service triggered when the application is unparked.                                                                                                                                                                                                                                                                                                |

*Sample uses of EDS:*

* **Lists from external services:** Selection fields (e.g. *Combobox*) can automatically populate with a list of options retrieved from an external service (Service Proxy), e.g. a list of products or SWIFT codes from an external system.
* **Local dictionaries:** Values can come from *dictionaries* defined in the Eximee Library — e.g. a list of countries, document types — shared between different applications.
* **Suggester (hint service):** Text fields can use special services of type *Suggester*, which suggest or correct the entered value.
* **Page/application services:** EDS also includes services associated with the entire application or page (so-called *Page Service*, *Entry Service*, *Exit Service*), which can fetch data for many fields at once in a single request (e.g. loading customer data when opening the application).

{% hint style="info" %}
Demo application: demoUslugi
{% endhint %}


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