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Use A Builder With JavaScript In WebParts

It is pretty easy to use JavaScript in your WebParts, and people that know me, know I frickin despise JavaScript. I really, really do. I know sometimes I have to use it, but I would prefer if it didn’t exist, even though I might start warming up to our old friend as Orcas since it is supposed to have better debugging and intellisense support (finally). Outside of my personal disdain for it, sometimes I have to use JavaScript (thanks to Trenton Kuzman who wrote my last script for my last WebPart at CENTAF:-) ), and I usually build it out by using an ArrayList object and passing it into a builder method so that I hydrate the builder object in my primary WebPart class file (which traditionally for this layer of abstraction would be kept in a custom WebPart base class that instead inherits from the WebPart base class, assimilated into your WebPart class file subsequently).

So basically, I want to be able to do this in an arbitrary WebPart class file:

  1. private void BuildExampleJavaScript (TextWriter oWriter)
  2. {
  3. oWriter.Write("<a href="javascript:buenz_ExampleFunction('{0}');">Do Something</a>", ID);
  5. // This is my function below, now I want to add some statements
  6. JavaScriptBuilder l_oBuilder = new JavaScriptBuilder();
  7. l_oBuilder.AddStatement("function buenz_ExampleFunction(id){");
  8. l_oBuilder.AddStatement("try{'arbitrary Statements}");
  9. oWriter.Write(l_oBuilder.ScriptString);
  10. }

It is cleaner to me. So I use this class file:

  1. using System;
  2. using System.Collections;
  3. using System.Text;
  5. namespace buenz.Examples
  6. {
  7. public class JavaScriptBuilder : IJavaScriptBuilder
  8. {
  9. private readonly ArrayList m_oStatements = new ArrayList();
  11. public void AddStatement(string line)
  12. {
  13. m_oStatements.Add(line);
  14. }
  16. public string ScriptString
  17. {
  18. get
  19. {
  20. StringBuilder l_oBuilder = new StringBuilder(100);
  21. l_oBuilder.Append("<script language="JavaScript">");
  22. l_oBuilder.Append(Environment.NewLine);
  23. l_oBuilder.Append(Environment.NewLine);
  24. foreach (string text in m_oStatements)
  25. {
  26. l_oBuilder.Append(text);
  27. l_oBuilder.Append(Environment.NewLine);
  28. }
  29. l_oBuilder.Append(Environment.NewLine);
  30. l_oBuilder.Append("</script>");
  31. return l_oBuilder.ToString();
  32. }
  33. }
  34. }
  35. }

and then this interface (to adhere to Design by Contract programming principles):

  1. namespace buenz.Example
  2. {
  3. public interface IJavaScriptBuilder
  4. {
  5. string ScriptString { get; }
  7. void AddStatement(string strLine);
  8. }
  9. }

which let’s me do what I want to accomplish. It looks cleaner and provides finer seperation IMHO.


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