Example 3 

The following code will create a simple entry form utilizing dynamic updates.  Screen images are displayed below, after the code.

Subroutine O4W_EXAMPLE_3(CtrlEntId, Event, Request)

* A simple entry/collection form with some dynamic updates

* Establish some constants we'll use in the example

Equ SizeList$ To "Small,Medium,Large"

Equ SizeCode$ To "S,M,L"

Equ SizeCost$ To "700,1000,1300"

 

Equ ToppingList$ To "Pepperoni,Sausage,Extra Cheese,Mushrooms"

Equ ToppingCode$ To "P,S,C,M"

Equ ToppingCost$ To "100,100,50,100"

* Always include our equates

$Insert O4WEquates

* Determine how we were called, and what to do

Begin Case

Case event _eqc "CREATE" ; Gosub Create_Event

Case event _eqc "CLICK" ; Gosub Click_Event

Case event _eqc "CHANGE" ; Gosub Change_Event

End Case

*

Return 0

 

CREATE_EVENT:

* Creation event - called the first time through for each application

* Specify that this will generate a full web page

O4WForm()

* Define the section that the form will go in

O4WSectionStart('mainSection')

* Put up the 'header' describing the page

O4WHeader("Revelation Software POS (Pizza Ordering System)", 4)

* "Space down" a few blank lines

O4WBreak()

O4WBreak()

* Use a table to align everything neatly

O4WTableStart("mainTable")

* Display a prompt in the first 'cell' of the table

O4WSetCell(1,1)

O4WText("Delivery Address: ")

* And put up a 'textbox' for the response in the next 'cell'

O4WSetCell(1,2)

O4WTextbox('', '', '', 'ADD1')

* Repeat for the other desired information

* Notice the shortcut: only specifying the 'row number' to O4WSetCell automatically puts you in the first column of that row

O4WSetCell(2)

O4WText("Address 2:")

* Notice the shortcut: if neither the row nor column is specified in O4WSetCell, it automatically puts you in the next column of the current row

O4WSetCell()

O4WTextbox('','','','ADD2')

O4WSetCell(3)

O4WText("City:")

O4WSetCell()

O4WTextBox('','','','CITY')

O4WSetCell(4)

O4WText("State:")

O4WSetCell()

* Use a combo box for the State

* O4W provides a standard 'states' code record in the standard "configuration" file

stateInfo = Xlate("O4WCODES", "CODES_STATES", "", "X")

num.states = dcount(stateInfo<1>, @VM)

* Define a 'default' value to prompt the user

O4WListBox("Select...", "", "STATE")

For each.state = 1 To num.states

state.name = stateInfo<1,each.state>

state.code = stateInfo<2,each.state>

O4WListBox(state.name, state.code, "STATE")

Next each.state

O4WSetCell(5)

O4WText("Zip:")

O4WSetCell()

O4WTextBox('','','','ZIP')

O4WSetCell(6)

O4WText("Pizza Size:")

O4WSetCell()

* Display a list of choices as radio buttons (allowing only a single choice)

* If we wanted to 'hard code' the choices, we could do this:

/*

O4WRadioButton("Small", "S", "SIZE")

O4WRadioButton("Medium", "M", "SIZE")

O4WRadioButton("Large", "L", "SIZE")

*/

* But it's better to drive this from the constants we declared at the top (so we can change them without changing the program logic)

NUM.SIZES = DCount(SizeList$, ",")

For each.size = 1 To num.sizes

this.size = Field(SizeList$, ",", each.size)

this.code = Field(SizeCode$, ",", each.size)

*O4WRadioButton(this.size, this.code, "SIZE")

* Identify each radio button with a unique name

O4WRadioButton(this.size, this.code, "SIZE", "SIZE_":this.code)

Next each.size

O4WSetCell(7)

O4WText("Toppings:")

O4WSetCell()

* Display a list of toppings as checkboxes (allowing multiple choices)

* If we wanted to 'hard code' the choices, we could do this:

/*

O4WCheckBox("Pepperoni", "Pepperoni", "TOPPINGS")

O4WBreak()

O4WCheckBox("Sausage", "Sausage", "TOPPINGS")

O4WBreak()

O4WCheckBox("Extra Cheese", "ExtraCheese", "TOPPINGS")

O4WBreak()

O4WCheckBox("Mushrooms", "Mushrooms", "TOPPINGS")

*/

* But it's better to drive this from the constants we declared at the top (so we can change them without changing the program logic)

NUM.TOPPINGS = DCount(ToppingList$, ",")

For each.topping = 1 To num.toppings

this.topping = Field(ToppingList$, ",", each.topping)

this.code = Field(ToppingCode$, ",", each.topping)

*O4WCheckBox(this.topping, this.code, "TOPPINGS")

* identify each checkbox with a unique name

O4WCheckBox(this.topping, this.code, "TOPPINGS", "TOPPINGS_":this.code)

O4WBreak()

Next each.topping

* End the table

O4WTableEnd("mainTable")

O4WBreak()

* define an area where the 'running total' can go

O4WSectionStart('runningTotal')

O4WSectionEnd('runningTotal')

* Display a button for them to submit the order

O4WButton("Order!", "BTNORDER")

* Tell O4W you wish to be notified when the user clicks on this button

O4WQualifyEvent("BTNORDER", "CLICK")

* Tell O4W we want to be notified when the size or toppings change

O4WQualifyEvent("TOPPINGS", "CHANGE", "CHECKBOX")

O4WQualifyEvent("SIZE", "CHANGE", "RADIOBUTTON")

* finish up the main section we defined

O4WSectionEnd('mainSection')

* create a special area for us to use when displaying some response to the user

* nothing goes in it now, but we may fill it in later

O4WSectionStart('responseArea')

O4WSectionEnd('responseArea')

RETURN

 

CLICK_EVENT:

* Click event - called when the button is pressed

* Tell O4W we'll be generating a response updating the current form (as opposed to making a whole new form)

O4WResponse()

* Read in all the values

ADD1 = O4WGetValue("ADD1")

ADD2 = O4WGetValue("ADD2")

CITY = O4WGetValue("CITY")

STATE = O4WGetValue("STATE")

ZIP = O4WGetValue("ZIP")

* Make sure these values have something in them

If TRIM(ADD1) = "" Or TRIM(CITY) = "" Or TRIM(STATE) = "" Or TRIM(ZIP)="" Then

O4WError("Please be sure to enter complete address information before proceeding")

Return

End

* Move the extraction of the size and topping values, and the calculation of the cost, to a subroutine so we can call it from the 'change' event too

/*

* 'SIZE' will return the S/M/L code from the SIZE radio buttons

SIZE = O4WGetValue("SIZE")

* 'TOPPINGS' will return an @VM-delimited list of the selected toppings

TOPPING = O4WGetValue("TOPPINGS")

* Calculate the price from the toppings and size selected

locate size In SizeCode$ Using "," Setting pos Then

cost = Field(SizeCost$,",",pos)

End Else

* Couldn't find the size in the list?  Report an error to the customer

O4WError("We're sorry, but the size '":size:"' doesn't appear to be valid!")

Return

End

* Now find each of the toppings

num.toppings = dcount(topping, @VM)

For each.topping = 1 To num.toppings

this.topping = topping<1,each.topping>

Locate this.topping In ToppingCode$ Using "," Setting pos Then

cost += Field(ToppingCost$, ",", pos)

End Else

* Couldn't find the topping in the list?  Report an error

O4WError("We're sorry, but the topping '":this.topping:"' doesn't appear to be valid!")

End

Next each.topping

*/

 

Gosub calc_Total

If error <> "" Then

O4WError(error)

Return

end

* In a 'real' application, you'd now write all the information we collected into a database somewhere

orderNum = DATE():"*":TIME()

* <WRITE INFORMATION HERE>

* Notify the customer that his order has been received, and give him/her the total

* We'll put this information into our 'responseArea'

* Note that we use a special style so that O4W knows we're updating the previously-defined area (and not asking to create a new one)

O4WSectionStart('responseArea', O4WResponseStyle())

O4WHeader('Your order number is ':orderNum, 4)

O4WBreak()

O4WText('Thank you for your order!  Your order total is ':OCONV(cost,'MD2,$'):'.')

O4WBreak()

O4WText('Please press ')

* Build a 'link' to return to the home page

O4WLink('here', 0, 'www.revelation.com')

O4WSectionEnd('responseArea')

* Display this area as a 'dialog box' to the user

O4WDialog('responseArea', 'Thank You')

RETURN

 

CHANGE_EVENT:

* The 'CHANGE' event is triggered when our toppings or size is changed

* Update our total cost

cost = 0

* Because of how we organized our form, all the values are passed to us when we get the CHANGE event

Gosub calc_Total

If error <> "" Then

* display any error message instead of our total

O4WError(error)

Return

end

* No error - display the total cost

* Tell O4W we're generating an update to the current form and not an entire new form

O4WResponse()

      * We'll put this information into our 'runningTotal'

      * Note that we use a special style so that O4W knows we're updating the previously-defined area (and not asking to create a new one)

O4WSectionStart('runningTotal', O4WResponseStyle())

O4WText("Current Order Total: ":Oconv(cost, "MD2,$"))

O4WSectionEnd('runningTotal')

RETURN

 

CALC_TOTAL:

* calcTotal subroutine will pull in the size and toppings info and calculate the cost

* if any errors occur, the variable "error" will be returned with the error text

error = ""

* 'SIZE' will return the S/M/L code from the SIZE radio buttons

SIZE = O4WGetValue("SIZE")

* 'TOPPINGS' will return an @VM-delimited list of the selected toppings

TOPPING = O4WGetValue("TOPPINGS")

* Calculate the price from the toppings and size selected

locate size In SizeCode$ Using "," Setting pos Then

cost = Field(SizeCost$,",",pos)

End Else

* Couldn't find the size in the list?  Report an error to the customer

error = "We're sorry, but the size '":size:"' doesn't appear to be valid!"

Return

End

* Now find each of the toppings

num.toppings = dcount(topping, @VM)

For each.topping = 1 To num.toppings

this.topping = topping<1,each.topping>

Locate this.topping In ToppingCode$ Using "," Setting pos Then

cost += Field(ToppingCost$, ",", pos)

End Else

* Couldn't find the topping in the list?  Report an error

error = "We're sorry, but the topping '":this.topping:"' doesn't appear to be valid!"

return

End

Next each.topping

RETURN