Question

Question 4 [10 Marks Answer all the questions 4. The marks for each part of the question is as indicated. Type and compile your amswer in the template answer sheet given. (a) Kenny's Groceries shop has an online order form. She has added some JavaScript functions to calculate of how much a person has to pay for tax before procced to payment, and now she wants to add her functions to her form buttons. i. Propose which event is best used for her buttons? [1 Marks) ii. Construct the JavaScript command line to execute the event button proposed in question (1), to trigger the function calcTax( ). Assume the button display with the text Tax Amount. [3 Marks] (b) Kenny wants to display the total from her caleTax() function in her form named frm_order in a text box name and id called txt_TaxAmount. Assume that the variable taxValue is declare to keep the temporary value for total tax amount before display it to the text box. Create a JavaScript command line to display the total tax amount in a text box. var taxValue = total_prices * taxRate; [3 Marks) (e) Kenny wants to simplify her program to make more flexible. She want a cale Tax() function is stored in an external file called "calcTax.js". The external file scriptis is located in the same folder as the current web site page. Create a JavaScript command line to call the an external file. [3 Marks)

Answer 1

a.) (i) onclick (as it will let her see the taxes quickly on the screen when she will click the button)

(ii) <input type ="button" value="TaxAmount" onclick="CalcTax()">

b.) Total: <input type="text" id="txt_TaxAmount" value="taxValue">

(as taxValue is already declared,we are directly using it)

c.) <script src="calcTax.js"></script>

(because the external script is in root directory only,that's why we do not need to specify the path)