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How to calculate Discount Percent, Discount Anount and then get the total in multiple rows and after calculating multiple rows total how to get grand total?

I have a problem which seems to be quite a rare one and I can safely say I know what exactly what is causing it. After some process of elimination I reached the conclusion that, in a website featuring five main pages - for which different information can be revealed/hidden, in three JavaScript-powered states the user can switch between - one of these pages is currently without this functionality simply because the HTML contains user input controls.

Using alert boxes for troubleshooting, I discovered that one of the arguments passed into the event, which occurs either when the relevant dropdown item or one of the 'tabs' near the bottom is clicked, is in fact an 'undefined' value. The purpose of the value is to reset one lot of elements, while two others in the same handlers that are involved in a similar action are always successfully recognised. Essentially all three states are to be made invisible before the next stage of the function, which is to determine what should now appear on screen and carrying it

You must validate the data from the form and output a record of all errors found in an appropriate way. Ensure that all input device values are retained in the input devices if any errors are detected. The validation rules are as follows:

• The customer id field must have a value, contain only numeric characters and be exactly 6 digits long and unique (i.e. does not already exist in the database)

• First and last name fields must have values and should not be more than 30 characters long each, contain only alphabetic characters or the hyphen(-­‐) character

• If address details are provided a value for state should be selected and postcode should only
contain numeric characters and be exactly 4 digits long.