Adobe Flash —

Write a function

A function is a script that you can use repeatedly to perform a specific task. You can pass parameters to a function, and it can return a value. In this lesson, every time your user clicks the Calculate button, a function will run that multiplies data in the input text fields and returns values in the dynamic text fields. You'll write that function now.

1.
In the Script pane, with the insertion point after the ActionScript that reads qty3_txt.text = 0;, press Enter (Windows) or Return (Macintosh) twice and type the following comment:

//Calculate quantity times price.

2.
Press Enter or Return and type the following to create a function that runs when the playhead enters Frame 1, where you're attaching the script:

this.onEnterFrame = function (){

3.
Type the following ActionScript to specify how the function should multiply the values in the input text fields for the airplane:

price1_txt.text = Number (qty1_txt.text)*Number

  (priceCD);

price1_txt is the instance name that you gave to the top price input text field on the Stage.

.text defines the text that should appear in the text field, which is the number of parts multiplied by the cost of the part: the $320 that you set as the value for the priceCD variable.
4.
Press Enter or Return, and type the following two lines:

price2_txt.text = Number (qty2_txt.text)*Number

  (priceShocks);

price3_txt.text = Number (qty3_txt.text)*Number

  (priceCover);

};

Your function should appear as follows:

//Calculate quantity times price.

this.onEnterFrame = function (){

  price1_txt.text = Number (qty1_txt.text)*Number

  (priceCD);

  price2_txt.text = Number (qty2_txt.text)*Number

  (priceShocks);

  price3_txt.text = Number (qty3_txt.text)*Number

  (priceCover);

};