Conditional Execution - If, else if, else

 

Description

The 'If' construct in deluge is the same as that of other languages. It conditionally executes a set of statements depending on the value of the boolean expression.

Syntax

if(<if-boolean-expression>)
{
    <if statements>
}
else if(<elseif-boolean-expression-1>)
{
    <elseif statements-1>
}
else if(<elseif-boolean-expression-2>)
{
    <elseif statements-2>
}
..
..
..
..
else if(<elseif-boolean-expression-n>)
{
   <elseif statements-n>
}
else
{
    <else statements>
}

An If construct should adhere to the following rules:

  • It should have an 'If' condition
  • It can have zero or more 'else if' conditions
  • It can have an optional 'else' part

When an <If Construct> is encountered during script execution, the condition specified by the <if-boolean_expression> is evaluated. If the condition is met, the statement in the <if statements> block are executed, but if the condition was not met, then the program flow skips the statements in the <if statements> block and searches for any else or else if keywords.

When an else if part is encountered, the condition specified by <boolean_expression-x> is evaluated and if the condition evaluates to true, the statements in <elseif statements-x> block is executed. If the <if condition> and all the <else if conditions> fails then the presence of <else> is searched and the statements in <else statements> block is executed.

Example - Free flow scripting

Let us take the example of a recruitment application. The deluge code for the on success block of the New_Applicant form is given below: 

on  add
    {
        on success
        {
            opening  =  New_Opening  [Position_Name == input.Applied_For];
            if (opening.Status  ==  "Closed")
            {
                sendmail
                (
                    To       :  input.Email_ID 
                    From     :  zoho.adminuserid 
                    Subject  :  "Reg application for job posted at recruitment.zohocreator.com" 
                    Message  :  "The job profile " + input.Applied_For + " for which you have applied is not currently open " 
                )
            }
            else if (opening.Experience  ==  input.Experience)
            {
                sendmail
                (
                    To       :  "manager-recruitment@adventnet.com" 
                    From     :  zoho.adminuserid 
                    Subject  :  "Applicants resume matches job profile" 
                    Message  :  input.Applicant_Name + " matches the job profile<br> Contach Info: " + input.Email_ID 
                )
            }
            else
            {
                sendmail
                (
                    To       :  input.Email_ID 
                    From     :  zoho.adminuserid 
                    Subject  :  "Reg application for job posted at recruitment.zohocreator.com" 
                    Message  :  "The experience required for the job profile " + input.Applied_For + "does not match yours" 
                )
            }
        }
    }

Code Explantion:

  • In the on success block, we first fetch the record from the New_Opening form, whose Position_Name matches with the position applied for.
  • if status of the position is "Closed" the statements inside the if block is executed.
  • if experience for the position is same as the experience specified, the statements inside the else if block is executed.
  • if the above two conditions fail, the statements inside the else block is executed.