"IF" and "ELSE IF" for the data received. Change Item by receiving some Value

You have to to use this example to make a condition in your script:

if (condition1 && condition2)
{
    <action>
};

Conditions in iRidium must be performed inside of EVENTS, which allows you to use some  data, generated by events:

IR.AddListener(IR.EVENT_TAG_CHANGE , IR.GetDevice("MyDriver"), function(name,value)
{
      <action>
});

EVENT_TAG_CHANGE sends you a name and value of the Driver's Feedback in your project, which changes now. So, you can use a name of the feedback and value of this feedback in your conditions.

IR.AddListener(IR.EVENT_TAG_CHANGE , IR.GetDevice("MyDriver"), function(name,value)
{
      if (name == "Feedback 1" && value == 100)
   {
      IR.Log("got 100 from Feedback 1");
      IR.GetItem("Page 1").GetItem("Item 1").Value = 1; //got 100 but set 1 in Item
    }

      else if ()
   {
       IR.Log("got something else");
    } 
});