Custom actions created with script extensions can generate code that implement conditional logic, that is, contains if…then or if…then…else statements. To generate a conditional statement, follow these steps:

Create an IfSyntax object using the Syntax.CreateIf method.
Create a ConditionSyntax object corresponding to the condition you want to test and assign it to the Condition property of the IfSyntax object. (See Generating Comparison and Logical Expressions.)
Create syntax elements corresponding to the statements of the then and else branches and assign them to the TrueSyntax and FalseSyntax properties of the IfSyntax object, respectively.

If you want a particular branch contain multiple statements, you should create a CollectionSyntax object that will serve as the block container and add the desired statements to this collection. (See Generating Statement Collections.)

After you have configured the IfSyntax object, you can pass it to the Syntax.GenerateSource method to get the actual script code of the conditional statement.

The example below demonstrates how you can generate conditional statements. It generates the code that posts an error message to the test log if the Success variable value is False:

JScript

VBScript

Copy Code

JScript

function ShowIfThenStatement()
{
    var oVarName = Syntax.CreateInvoke();
    oVarName.InvokeName = "Success";
    oVarName.IsProperty = true;

    var oCondition = Syntax.CreateCondition();
    oCondition.OperatorType = oCondition.otNot;
    oCondition.Right = oVarName;

    var oMethodCall = Syntax.CreateInvoke();
    oMethodCall.ClassValue = "Log";
    oMethodCall.InvokeName = "Error";
    oMethodCall.IsProperty = false;
    oMethodCall.AddParameter("Checkpoint failed.");

    var oIf = Syntax.CreateIf();
    oIf.Condition = oCondition;
    oIf.TrueSyntax = oMethodCall;

    var strCode = Syntax.GenerateSource(oIf);
    aqDlg.ShowMessage(strCode);
}

VBScript

Sub ShowIfThenStatement
    Dim oVarName, oCondition, oMethodCall, oIf, strCode

    Set oVarName = Syntax.CreateInvoke
    oVarName.InvokeName = "Success"
    oVarName.IsProperty = True

    Set oCondition = Syntax.CreateCondition
    oCondition.OperatorType = oCondition.otNot
    oCondition.Right = oVarName

    Set oMethodCall = Syntax.CreateInvoke
    oMethodCall.ClassValue = "Log"
    oMethodCall.InvokeName = "Error"
    oMethodCall.IsProperty = False
    oMethodCall.AddParameter "Checkpoint failed."

    Set oIf = Syntax.CreateIf
    oIf.Condition = oCondition
    oIf.TrueSyntax = oMethodCall

    strCode = Syntax.GenerateSource(oIf)
    aqDlg.ShowMessage strCode
End Sub