ASP Components

An ActiveX component is a file containing code that performs a task or set of tasks. Components perform common tasks so that you do not have to create your own code to perform these tasks. For example, a stock ticker component might display the latest stock quotes on a Web page. ASP comes with base components that you can use immediately, such as the Database Access component. You can obtain additional components from third party developers. Or, you can write your own components.

You use. components as the basic Wilding blocks of your script or Webbased application. If you are new to scripting, you can write scripts that use components without knowing anything about how the component works. You simply need to know how to access the objects provided by the components. Components enable you to write powerful scripts without learning any programming.

It you are a Web application developer, you can write components to encapsulate business logic. For example, you could write a component to calculate the sales tax on a product sale. You could then call the component from a script that process a sales order. Isolating the tax calculation from the order process enables you to update the component when the sales tax for an area changes without changing your order process. You can write components in any programming language that supports the Component Object Model (COM), such as C, C + +, Java, or Visual Basic. If you are familiar with COM programming, ActiveX components are Automation servers. To run on the Web Server, your ActiveX components cannot have any graphical use interface elements, such as the Visual Basic MsgBox f unction.

Components tire reusable. One you have installed a component on your Web server,.Vbu can call it from an ASP script, an ISAPI application, another component on the server, or a program written in another COM compatible language.

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