Automate user actions in a web page - Microsoft Windows Workflow Foundation

• Download source files - 15.2 Kb

Introduction

During Christmas holidays, I read about Microsoft Windows Workflow Foundation (WWF) for the first time and realized that I was too late in learning this new technology. "Better late than never" - so I decided to get my hands wet on this framework. WWF is an extensible framework from Microsoft to implement workflow based solutions. In simple terms, a workflow is a collection of activities. To read more on WWF, please visit the MSDN site.

At least once in a day, all of us open a web browser to do some search in Google, open our email account to check emails, and so on. This is an example of a human workflow, and in this article, I am going to show how to express this workflow in WWF.

Activities Defined

For doing a Google search, one has to perform the following activities:

1. Open the browser.
2. Navigate to the Google site.
3. Enter the search text.
4. Press the Search button.

For checking emails in a Hotmail account, one has to perform the following activities:

1. Open the browser.
2. Enter the username.
3. Enter the password.
4. Press the Sign In button.

In the above scenarios, we are filling a form in a web page and posting it. To accomplish this workflow, I did a very minimal abstraction and came up with the three activities below:

• VisitPage - Opens the browser and navigates to the specified website.
• InputData - Fills up the input controls on the webpage with the specified values (supports textbox, textarea, radio button, checkbox, dropdownlist).
• Click - Posts the form by pressing the specified button

Custom Activity

Microsoft has made WWF application development very easy by providing the Visual Studio® 2005 Extensions for WWF. A separate project template is available for developing the Activity library. To implement a custom activity, all we have to do is derive from the Activity class and override the Execute method.

public class MyActivity : Activity 
{
    protected override Status 
              Execute(ActivityExecutionContext context) 
    {
        .
        .
    } 
}

I added additional properties for the VisitPage, InputData, and Click activities. See the attached code for details.

Defining a Workflow

Visual Studio has full designer support to model a workflow and even allows us to define breakpoints in the designer itself for debugging. Workflows can be defined in XML format also (XOML - XML workflow markup). Figure 1 is Hotmail account login workflow in designer view, and figure 2 is a Google search workflow in text view.

Figure 4 - Hotmail Login

Figure 5 - Google Search

Scope

There are so many automated web filing systems available today for a variety of services. I am sure that they are proprietary solutions very hard to develop, maintain, and to train new people. Now, we have got a very good generic, extensible framework from Microsoft with a full suite of developer tools to develop workflow based solutions. With the designer support, even a business analyst can complete a workflow without any help from a developer. I strongly believe that re-engineering web filing systems using WWF will deliver true ROIs.

Developer Info

The sample application was developed using Microsoft Pre-Release Software WinFX Runtime Components - December Community Technology Preview (CTP). Microsoft internet controls were used for the IE browser functionalities.