blockly > IConnectionChecker > canConnectWithReason
IConnectionChecker.canConnectWithReason() method
Checks whether the current connection can connect with the target connection, and return an error code if there are problems.
Signature:
canConnectWithReason(a: Connection | null, b: Connection | null, isDragging: boolean, opt_distance?: number): number;
Parameters
| Parameter | Type | Description |
|---|---|---|
| a | Connection | null | Connection to check compatibility with. |
| b | Connection | null | Connection to check compatibility with. |
| isDragging | boolean | True if the connection is being made by dragging a block. |
| opt_distance | number | (Optional) The max allowable distance between the connections for drag checks. |
Returns:
number
Connection.CAN_CONNECT if the connection is legal, an error code otherwise.