Collection of objects in classic ASP using VBScript

asp-classiccollectionsvbscript

I have a class called 'Company' that has properties like 'CompanyName', 'CompanyCode' and 'IsActive'. This class is in VBScript. I want to store a collection of Company objects using VBScript in classic ASP. Is this possible, and if yes, then how would I do it?

Best Solution

You can use an array or a dictionary object:

Array

' create an array with a fixed size
dim companies(2) 

' fill the array with the companies
set companies(0) = Company1 
set companies(1) = Company2
set companies(2) = Company3

' iteration example 1
dim company
for each company in companies
    response.write company.CompanyName
next

' iteration example 2
dim i
for i = 0 to ubound(companies)
    response.write companies(i).CompanyName
next

Dictionary

' create a dictionary object
dim companies
set companies = server.createObject("Scripting.Dictionary")

' add the companies
companies.add "Key1", Company1
companies.add "Key2", Company2
companies.add "Key3", Company3

' iteration example
dim key
for each key in companies.keys
    response.write key & " = " & companies.item(key).CompanyName
next

Related Solutions

Rest – Calling REST web services from a classic asp page

You could use a combination of JQuery with JSON calls to consume REST services from the client

if you need to interact with the REST services from the ASP layer you can use

MSXML2.ServerXMLHTTP

like:

Set HttpReq = Server.CreateObject("MSXML2.ServerXMLHTTP")
HttpReq.open "GET", "Rest_URI", False
HttpReq.send

Java – Iterating through a Collection, avoiding ConcurrentModificationException when removing objects in a loop

Iterator.remove() is safe, you can use it like this:

List<String> list = new ArrayList<>();

// This is a clever way to create the iterator and call iterator.hasNext() like
// you would do in a while-loop. It would be the same as doing:
//     Iterator<String> iterator = list.iterator();
//     while (iterator.hasNext()) {
for (Iterator<String> iterator = list.iterator(); iterator.hasNext();) {
    String string = iterator.next();
    if (string.isEmpty()) {
        // Remove the current element from the iterator and the list.
        iterator.remove();
    }
}

Note that Iterator.remove() is the only safe way to modify a collection during iteration; the behavior is unspecified if the underlying collection is modified in any other way while the iteration is in progress.

Source: docs.oracle > The Collection Interface

And similarly, if you have a ListIterator and want to add items, you can use ListIterator#add, for the same reason you can use Iterator#remove — it's designed to allow it.

In your case you tried to remove from a list, but the same restriction applies if trying to put into a Map while iterating its content.

Best Solution

Related Solutions

Rest – Calling REST web services from a classic asp page

Java – Iterating through a Collection, avoiding ConcurrentModificationException when removing objects in a loop

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