Validate the amount entered in the field before moving on to the next field

I'm creating a simple travel map.  In a section, the user must enter the cost of the meal and the left end.  The tip must not exceed 20% of the cost of the meal.  I need the form to check the tip came in to make sure that it is not more than the maximum.  If it does not exceed 20% of the meal, I would change the amount of the tip to the maximum allowed and display a message to the user know it has changed. I know virtually nothing about JavaScript programming.

I would appreciate help that anyone can provide.  I also need to know exactly where to put the script - in the validation section of field or in the form of action as "the blur".

Thank you!

For the area of the tip, use the "servicing" tab in the winodw properties.

script validation custom;
get the subtotal for the cost of the meal in total;
var nSubTotal = this.getField("Name_of_SubTotal_Field").value;
test if this field (tip) is greater than 20% of the subtotal;
If (event.value > 0.20 * nSubTotal) {}
type is greater than 20% of the subtotal;
Event.Value = 0.20 * nSubTotal;
App.Alert ("Tip adjusted to 20% of the cost of meal!", 0, 1, "Excissive Tip");
} / / end of excessive peak
end of script validation custom;

Tags: Acrobat

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