This dropdown list shows all Form Views associated with this stream. If a Form View is selected then it will be presented prior to this action being run to allow the user to enter values to be used in Context Parameter, Validation, Filter or Action Attribute expressions. These values are referenced in those expressions by preceding the field name from the form with '_prompt'. For example if there is a field on the form with the label "Name" then the value entered in that field by the user can be referenced in subsequent expressions as _prompt.Name.

If the Stream Action selected on the Item Updates tab is 'Update' then the form will be pre-populated with the values from the selected record; where multiple records are selected then only those values which are common to all the selected records will be displayed. If any other Stream Action is selected then the form fields will initially be blank.

A Check box to determine whether a Tag Expression field is displayed. The tag expression can refer to any values entered on the Form View using the notation _prompt.<Form Field Name>, the values of any Context Parameters using the notation _context.<ContextParameter Name> and any attributes of any records selected on the view or dashboard from which the action was initiated using the notation <View name or alias>.<Attribute name or alias>.

If a tag expression is provided then when the action is run a file explorer dialog will appear to allow the user to navigate to a directory and select one or more files. These files will be uploaded to the File Upload Directory specified in the System Configuration table and tagged with the evaluated value of this tag expression so that they can be retrieved later by suitably configured File Collector.

List of names of uploaded files can be accessed through <i>_files</i> variable.

An expression for the context parameter. The Context Parameter expressions can refer to any values entered on the Form View using the notation _prompt.<Form Field Name>. The Context Parameters can also refer to any attributes of any records selected on the view or dashboard from which the action was initiated using the notation <View name or alias>.<Attribute name or alias>. It is not possible to refer to one context parameter from another.

The values returned by the context parameter expressions can be referenced by the Validation expression, the Filter, the Maximum and Minimum Items expressions, any Stream Action Attribute expressions and any dashboard opened by this action.

The context values are referenced using the syntax _context.<context parameter name>.

For example, imagine that you have a view called 'customers' which shows a list of customers including the account id, name and other account details and you want to create an action button to open up another dashboard, containing a view called 'invoices', which will show the invoices for the specific customer selected on the 'customers' view. To do this you would add an action button to the 'customers' view and configure it to open the dashboard containing the 'invoices' view. You would then add a context parameter called 'account' to the action with the context parameter expression set to 'customers.account_id'. On the background filter of the 'invoices' view you would then set the filter to only select those invoices whose account_id was equal to '_context.account'.

Unlike stream action attribute expressions, context parameter expressions can evaluate to a list of values as well as single values.

The usual message functions debug(message), info(message), warning(message), and error(message) are all available to be used in these expressions and will result in messages being written to the system console logs.

However special attention should be taken when using the error(message) function as this will also STOP the action from being completed.

The validation expression is evaluated at the start of any stream item Insert or Update actions and if the validation expression generates any error messages (using the error function) then the action is abandoned. The validation expression is not used to decide whether or not to run the selected Task Plan.

The validation expression can include multiple statements by wrapping them in a do() clause. A number of internal variables are available in these expressions:

• _this: A reference to all the selected records within the view to perform the action on.
• _prompt: A reference to all the user prompted action attributes.

The usual message functions debug(message), info(message), warning(message), and error(message) are all available to be used in these expressions and will result in messages being written to the system console logs.

However special attention should be taken when using the error(message) function as this will also STOP the action from being completed.

if(sum(_this.amount) == 0, info('OK'), error('Not performing Action as the Sum does not equate to zero'))

if(stringLength(_prompt.UserComment) >= 10, info('OK'), warning('Comment should be at least 10 characters'))

Note that you can also reference selected records from other dashboard views by using their view names:- i.e if(sum(ACCTS.amount) == 0, info('OK'), error('Error as ACCTS Sum does not equate to zero'))

The Result Message is displayed when the Action has completed and may be used to provide a summary of the Action.

The message can contain multiple expressions inside {} brackets - these expressions are evaluated in turn before the message is displayed.

E.g.

Action {_action} failed with {_errors} errors and {_warnings} warnings.

A number of internal variables are available in these expressions:

• _error: Details of the error messages generated.
• _errors: The number of error messages generated.
• _warning: Details of the warning messages generated.
• _warnings: The number of warning messages generated.
• _messages: The number of warning messages generated.
• _taskPlan: The name of the Task Plan that the Action ran (may be null)
• _runId: The runId of any Stream data generated by this Action (may be null).
• _action: The name of the Action.
• _file: Details of files processed (imported or exported) by the Action.
• _fileCount: The number of files processed by the Action.

• None
• Update
• Insert
• Delete

Please be aware that a Deletion action is non-reversible. In some circumstances it may therefore be better to select an Update action to simply mark the records as 'deleted' and then configure an Archive Task to remove records marked as deleted after a certain period of time. This will provide a window of opportunity for these 'deletions' to be reversed manually if they are made by mistake.

• Selected Items - Action will only apply to the records selected on the view from which the action was initiated.
• View Filter - Action will only apply to the records shown on the view from which the action was initiated.
• Action Filter - Action will only apply to the records retrieved by the filter defined in the Filter tab.

A Grid showing all the associated Stream Action Attributes that form part of this stream action. See the Stream Action Attribute form.

This grid only appears if the Stream Item Action selected is Update or Delete.