Custom Lookup Control with multi select and with multiple entities

Hi Learners,

Here is the supported / documented way of creating a custom Lookup input control using Client Side Scripting (JavaScript). We can use this to capture multiple records across multiple entities (Just like Party List control in Email Activities). It can be called from form events / HTML web resource to prompt input from users using Lookup control.

JavaScript Sample Code:

When invoked, this function prompts a lookup control as a model dialog (aligned to the right, like Quick Create Form)

Search will be performed across the entities specified in entityTypes property (Accounts, Leads and Contacts in this Sample)

We can select multiple records from the results

When we click on “Add“, the selected entity reference objects are passed to the Success Call back function as below. We can use this information further in our JavaScript Code based on the requirement.

lookupOptions object defines the look and behavior of the lookup control. It has got all the properties that an OOB lookup control on the form would have, like view selection control, disabling most recently used items etc.

Below is the list of properties available. More information available HERE

Property Name	Type	Required	Description
allowMultiSelect	Boolean	No	Indicates whether the lookup allows more than one item to be selected.
defaultEntityType	String	No	The default entity type to use.
defaultViewId	String	No	The default view to use.
disableMru	Boolean	No	Decides whether to display the most recently used(MRU) item.
entityTypes	Array	Yes	The entity types to display.
filters	Array of objects	No	Used to filter the results. Each object in the array contains the following attributes:
searchText	String	No	Indicates the default search term for the lookup control.
showBarcodeScanner	Boolean	No	Indicates whether the lookup control should show the barcode scanner in mobile clients.
viewIds	Array	No	The views to be available in the view picker. Only system views are supported.

References:

1) https://docs.microsoft.com/en-us/powerapps/developer/model-driven-apps/clientapi/reference/xrm-utility/lookupobjects