try
This function is used by Ignition's Expression language.
Description​
This expression is used to suppress errors caused by other expressions. The first expression will be executed, and if it executes successfully, its value will be used. However, if there is an error evaluating it, the value of failover will be used. When the failover is used, the data quality will be set by the failover value.
Syntax​
try(expression, failover)
Parameters​
| Type | Parameter | Description |
|---|---|---|
| Object | expression | An expression that can evaluate to any supported data type. |
| Object | failover | The value to return if an error occurs while evaluating expression. |
Returns​
Object - The result of the evaluated expression, or the failover value if an error occurs.
Examples​
Code Snippet
try(toInteger("boom"), -1) // returns -1 with a quality code of 192 (good)
Code Snippet
// fetch an integer value from the first row of a table. Return -1 if there are no rows
try({Root Container.Power Table.data}[0, 'Integer Column'], -1)