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Example 13.2:
Creating an Object Hierarchy--Properties Can be Objects
This form displays all the properties for each object created. Object class 'order' has the object class 'product' as a property.
This page uses the following to create the objects:
<![CDATA[
<SCRIPT LANGUAGE="JavaScript">
<!--
//==========================================================================
function product(nam, p) {
this.name = nam
this.price = p
}
//==========================================================================
function order(custname, prod, numbof) {
this.customer = custname
this.ProductType = prod
this.quantity = numbof
this.OrderDate = new Date()
}
var product1 = new product("TimeSaver", "$23")
var product2 = new product("MoneySaver", "$11")
var product3 = new product("Time n'MoneySaver", "$99")
var order1 = new order("Mr Brainless", product1, 5)
var order2 = new order("Mr Bonkers", product3, 22)
var order3 = new order("Mr Bozo", product2, 1)
//==========================================================================
//-->
</SCRIPT>
]]>
Then we write the object properties like this:
<![CDATA[
<SCRIPT LANGUAGE="JavaScript">
<!--
//======================================================================
document.write("NAME: " + order1.customer + "<BR>QUANTITY: " + order1.quantity + " ")
document.write("<BR>DATE: " + order1.OrderDate)
document.write("<BR>PRODUCT TYPE: " + order1.ProductType.name + "<BR>PRICE: " + order1.ProductType.price + "<P>")
document.write("NAME: " + order2.customer + "<BR>QUANTITY: " + order2.quantity + " ")
document.write("<BR>DATE: " + order2.OrderDate)
document.write("<BR>PRODUCT TYPE: " + order2.ProductType.name + "<BR>PRICE: " + order2.ProductType.price + "<P>")
document.write("NAME: " + order3.customer + "<BR>QUANTITY: " + order3.quantity + " ")
document.write("<BR>DATE: " + order3.OrderDate)
document.write("<BR>PRODUCT TYPE: " + order3.ProductType.name + "<BR>PRICE: " + order3.ProductType.price + "<P>")
//-->
</SCRIPT>
]]>
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