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A web component can specify in it's .spec file that initially, at first show or each time the foundset gets completely refreshed it wants to automatically receive a number of rows in the viewport. This is useful to avoid some round trips between client and server and send data directly. It is configurable because some component components may want to send no records initially while others might need to send many. This is done via the initialPreferredViewPortSize option. Default value is 50.

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• the real underlying foundset
• to the dataproviders that the property will send to the client webcomponent (dataproviders contains key-value pairs where key is the name of the column used in web component client side scripting and value is the name of the foundset column attached to that).

Both myFoundset.foundset  and and myFoundset.dataproviders are read-write valuesproperties under the foundset property type.

Setting Setting myFoundset.foundset is only allowed if at design time you selected either "- none -" or a separate foundset for that property (so they are not related to the form directly). Parent form foundset and foundsets related to the form foundset are managed by Servoy automatically and they cannot be set through scripting at runtime. Of course you can alter the contents loaded by those form/related foundsets at runtime, but you cannot change completely the foundset by reference.

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// elements.myFoundsetBasedBean.myFoundset.foundset gives access to the
// underlying Servoy foundset used by this property
application.output(elements.myFoundsetBasedBean.myFoundset.foundset.getSelectedIndex())
elements.myFoundsetBasedBean.myFoundset.foundset.loadRecords(someQBSelect)

// elements.myFoundsetBasedBean.myFoundset.dataproviders gives access to the
// configured dataproviders of the Servoy foundset property; probably most useful
// in combination with dynamicDataproviders: "true"
elements.myFoundsetBasedBean.myFoundset.dataproviders = {
	dp1: "userNickname",
	dp2: "userReviewRating",
	dp3: "numberOfPurchasedItems"
}
if (!elements.myFoundsetBasedBean.myFoundset.dataproviders.rating)
	elements.myFoundsetBasedBean.myFoundset.dataproviders.rating = "userReviewRating";

(Starting with Servoy 8.1.3) Foundset typed properties can be assigned directly to as well. This will create a completely new foundset type property.