CreateNodeField()

Summary

Creates a formula field on a line layer using data from the associated node layer.

 

Syntax

new_field = CreateNodeField(string line_layer, string field_name, string node_field_spec, string which_node, array options)

 

Argument	Contents
line_layer	The line layer to which the field is added
field_name	The desired name for the new formula field
node_field_spec	The full field spec for the node layer field
which_node	From or To, indicating which of the two nodes the data should be taken from
options	No options are currently supported

 

Returns

The actual name of the field in the line layer.

 

Notes

• Use CreateNodeField() to display start node or end node information for line features.

• Once created, a node expression field is treated like any other expression field.

Example

// Add start node and end node fields to a line layer

start_fld =CreateNodeField("Highways", "Start Node", "Endpoints.ID", "From", )

end_fld = CreateNodeField("Highways", "End Node", "Endpoints.ID", "To", )

 

Error Codes

Error Type	Meaning
NotFound	One of the layer names or field names is invalid

 

See Also

Function	Summary
CreateExpression()	Creates an expression field on a view
DestroyExpression()	Destroys an expression field
GetExpressions()	Returns an array of all expression fields defined in a view