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Rules are probably best described by using examples. This chapter contains numerous real world samples.

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Show/Hide Manager Approval

You have a flow and the first form has a Section for manager approval. The Section is hidden by default. Here is an example of a rule that makes the section visible in the second step of the flow which is a linked activity assigned to the manager role. 

Code Block
if (form.load) {
  var an = _data.getParameter ("flow.activity.name");
  if (an === 'Manager' || an === 'VP'){
    ManagerApproval.visible = true;
  } else {
    ManagerApproval.visible = false;
  }
}

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Warning

Rules initializing dates & time will not work in a form.load rule unless you specify a timezone on the form's Url via the _formTz Url parameter. This is because the form server needs to know the timezone in which to return the date and time. If you do not specify a _formTz the methods will return null and the control values will remain blank. The timezone strings can be found here. For example, to specify Eastern time: &_formTz=America/NewYork.

Age

This example form automatically determines today's date and then calculates the person's age in the control named 'Age' when they enter their birth date into the control named 'BirthDate'.

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Code Block
languagejavascript
if (BirthDate.value.length > 0) {
  var today = new Date();
  var dob = BirthDate.value.split('-'); 
  var dob2 = new Date(dob[0],dob[1]-1,dob[2]);
  var age = today.getFullYear() - dob2.getFullYear();
  if (today.getMonth() < dob2.getMonth() || 
     (today.getMonth() === dob2.getMonth() &&
      today.getDate() < dob2.getDate())) {
    age -= 1;
  }
  if (age >= 0) {
     Age.value = age;
  } else {
     Age.value = null;
  }
}
 

Duration

This form initializes the hospital discharge date using a rule, and when the user enters the admission date a 2nd rule calculates the number of days the patient stayed in the hospital.

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