How do I create a "Calculate Total" button?

Question

I am working on a form where I want the user to press a button to calculate the total after the series of fields have been entered.

So for example, there are five fields named Data.0, Data.1, Data.2, Data.3, Data.4

And a field named Total_Data and a button named Calculate_Sum. I don't want Total_Data to populate automatically as a running total. I want the user to enter values into the Data fields and then press Calculate_Sum at which point the script runs and the value appears in the Total_Data field.

In my actual form there are as many as 40 Data fields so obviously I don't want to write an entire script of

var a = this.getField("Data.0").value;

var b = this.getField("Data.1").value;

...... (etc.)

event.value = (a+b+c+...)

How do I script the Calculate_Sum button?

ls_rbls · Answer

You can use this example to customize your current script:

Example Make a calculation of the values of the child fields of the parent field.

// f has 3 children: f.v1, f.v2, f.v3

var f = this.getField("f"); var a = f.getArray(); var v = 0.0; for (j =0; j < a.length; j++) v += a[j].value;

// v contains the sum of all the children of field "f"

The example above is a reference from the JavaScript API JavaScript™ for Acrobat® API Reference Field methods, page 416

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