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asset:isempty

Determines whether a field in an asset is empty.

Syntax

<asset:isempty 
      name="name"
      field="field name"
      output="variable name" />

Parameters

name (required)

Name of a previously loaded asset. See asset:load.

field (required)

Name of the field in the object.

output (required)

Name of output variable.

Description

The result of this tag (held in the output variable) is either the string "true" or the string "false." If the tag results in an error, no output variable is created and errno is set.

Error Numbers

The possible values of errno include:

Value	Description
-10004	Missing required attribute.
-10005	No object by specified name.

Example

This code checks if there is something in the urlpicture field and if so, displays it:

<asset:isempty name="anAsset" field="urlpicture" output="hasnodata"/>
<ics:if condition='<%=ics;GetVar("hasnodata").equals("false")%>' >
<ics:then>
	<asset:get name="anAsset" field="mimetype" output="asset:mimetype"/>
	Picture:
	<render:satelliteblob asset="anAsset" field="urlpicture" blobheader='<%=ics.GetVar("asset:mimetype")%>' service="IMG SRC">
		<render:argument name="alt" value='<%=ics.GetVar("asset:alttext")%>'/>
		<render:argument name="hspace" value="5"/>
		<render:argument name="vspace" value="5"/>
	</render:satelliteblob>
</ics:then>
</ics:if>

asset:get
asset:load
asset:scatter

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