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Other Filters

These filters provide a various utility roles in creating your lava.

 

AddLinkTagToHead

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Adds a link to the HTML head of the current page.

 

AddMetaTagToHead

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Creates a meta tag that will be inserted into the HTML head. This is useful for adding social media links.

 

Postback

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This is a very specialized Lava filter that helps to wire-up ASP.Net postbacks. This is only available on specific blocks that provide 'Postback Commands'. The 'Group Details Lava' is an example of a block that provides these hooks.

 

SetPageTitle

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Takes a string as input and sets the page's title.

 

PropertyToKeyValue

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Takes a property and returns it as a key/value pair. This is helpful for iterating over a list of properties.

 

Page

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Returns information about the current page.

 

PageRedirect

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Will redirect the page to the provided URL.

 

Property

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Returns the property of a provided object. This often saves you from having to assign an object to a variable to get just one of its properties.

 

HasRightsTo

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This filter helps you check the security of the model you pass it.

 

Notes

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Retrieves notes for the provided entity.

 

PageParameter

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Returns the value of a specified page parameter.

 

FromCache

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Reads objects from the Rock cache which will reduce the number of database reads your Lava produces.

 

ResolveRockUrl

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This filter helps to resolve the application path in Rock using ~/ for the application home and ~~/ for the theme home. This is helpful when writing Lava that may be used by several organizations.

 

AsBoolean

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Converts the input to a Boolean (true/false) value.

 

AsInteger

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Converts the input to an integer value.

 

AsDecimal

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Converts the input to a decimal value.

 

AsDouble

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Converts the input to a double value (which has less precision than a decimal).

 

AsString

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Converts the input to a string value.

 

AsDateTime

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Converts the input to a DateTime value.

 

Debug

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The debug filter provides you with a ton of information on the variables you have access to in your Lava.

 

Client

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Returns information about the client browser.

 

AddCssLink

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Adds a CSS link to the page. If the link has already been previously registered (by a block or other Lava) it will not be duplicated.

 

AddScriptLink

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Adds a script link to the page. If the link has already been previously registered (by a block or other Lava) it will not be duplicated.

 

Url

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The Url filter allows you to easily get access to parts of a URL without a ton of string manipulation.

 

Base64Encode

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Converts a binary file to a base-64 encoded string.

 

GroupById

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Provides a full Group object by providing an Id of the group.

 

GroupByGuid

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Returns a full Group object from the Guid of the group.

 

CreateShortLink

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Creates a URL short link for the provided URL.

 

Md5

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Converts a string into an MD5 hash.

 

Sha1

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Converts a string into a SHA-1 hash.

 

Sha256

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Converts a string into a SHA-256 hash.

 

HmacSha1

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Converts a string into a SHA-1 hash using a hash message authentication code (HMAC).

 

HmacSha256

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Converts a string into a SHA-256 hash using a hash message authentication code (HMAC).

 

XamlWrap

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Wraps XAML in CDATA tags to make it XML compliant.

 

PersistedDataset

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Returns data contained in a Persisted Dataset as a Lava object.

 

AppendFollowing

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Returns the following status for the currently logged in user to the results of an entity command or Persisted Dataset.

 

FilterFollowed

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Returns a subset of followed entities for the current user from either a Persisted Dataset or an entity command.

 

FilterUnfollowed

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Returns a subset of entities that have not been followed by the current user from either a Persisted Dataset or an entity command.

 

EntityFromCachedObject

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Returns a full entity object loaded from the database from its cached counterpart.

 

ImageUrl

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Simplifies making an image URL with a fallback.

 

AddResponseHeader

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Adds a header to the HTTP response. This allows you to set custom headers. Note that any headers already being set in Rock will overwrite the values you provide. These should only be used to add custom headers.

 

WriteCookie

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Sets a HTTP cookie for the current user session. Cookies provide a means of storing information about the current user's session that can be accessed in subsequent requests.

 

RockInstanceConfig

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Shows configuration values for the current Rock instance.

 

ReadCookie

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Gets the value of a HTTP cookie for the current user session.

 

RunLava

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Executes Lava that is inside a string.

 

FromBase64

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Decodes the base 64 encoded string and returns the resulting data.

 

PageRoute

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Converts a page identifier into a URL string.

 

IsFollowed

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Takes an entity object as input and tests if it is being followed by the current person. Returns a boolean value of either true or false.

 

UniqueIdentifier

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Generates a new GUID (UUID) string. These are generally considered to be globally unique. This makes them ideal to use inside a shortcode where you need to identifier an HTML element by id but know the shortcode may be used twice on the same page.

 

SetUrlParameter

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Sets a parameter in the input URL string and returns the updated URL.

 

IsInDataView

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Takes the given Entity or Entity Id and returns a boolean that indicates whether the entity is in the data view or not.

 

RenderStructuredContentAsHtml

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Takes the given structured content and renders it as HTML.

 

ToIdHash

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Returns an alphanumeric string that can be used to uniquely identify a Rock Entity.

 

FromIdHash

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Returns a Rock Entity Id from an IdHash string generated by the ToIdHash filter.

 

AppendWatches

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Returns information about whether the current person has watched various media files provided. This filter is highly customizable to work in various different scenarios.

 

AddToMergeFields

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Allows you to add a new item to the provided Lava merge fields.

 

GuidToId

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Converts one or more entity Guid identifiers to corresponding Id values for the specified entity type.

 

CreateEntitySet

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Creates a new EntitySet from a list of entity identifiers of the specified type.

 

AppendSegments

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Adds personalization segment information for the currently logged in user to the results of an entity command or Persisted Dataset.

 

AsGuid

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Converts the input to a Guid value.

 

ToJSON

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Returns a JSON representation of the object. This is useful if you are wanting to return the object for use in JavaScript.

 

FromJSON

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Takes a JSON string and makes a Lava object from it.

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