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
programming 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 |