Simple Question - select/list box

Edge118 · Jun 8, 2005

I just started learning asp .net yesterday and I had a question regarding the following code:

Code:

<%@ Page Language="C#" %>

<html>
   <head>
      <link rel="stylesheet"href="intro.css">
   </head>

   <body><!-- #include File="C:\Inetpub\[URL unfurl="true"]wwwroot\DotNetJunkies\DotNetJunkiesWeb\_js\omni.inc"[/URL] -->

       <center>

       <form action="intro3.aspx">

           <h3> Name: <input name="Name" type=text value="<%=HttpUtility.HtmlEncode(Request.QueryString["Name"])%>">

           Category:  <select name="Category" size=1>

                         <%
                             String [] values = { "psychology", "business", "popular_comp" };

                             for (int i=0; i<values.Length; i++) {
                          %>

                                <option <% if (Request.QueryString["Category"] == values[i]) { Response.Write("selected"); } %>>
                                   <%=values[i]%>
                                </option>

                          <% } %>

                      </select>

           </h3>

           <input type=submit name="Lookup" value="Lookup">

           <p>

           <% if (Request.QueryString["Lookup"] != null) { %>

              Hi <%=HttpUtility.HtmlEncode(Request.QueryString["Name"]) %>, you selected: <%=HttpUtility.HtmlEncode(Request.QueryString["Category"]) %>

           <% } %>

       </form>

       </center>

   </body>
</html>

In the line:

Code:

<option <% if (Request.QueryString["Category"] == values[i]) { Response.Write("selected"); } %>>

I'm not sure how the select box is being populated through the Response.Write("selected")
How does "selected" represent the array of string values?

I hope I wasn't too confusing. Thanks for any help you can give me.

"Pin me. Perl me."

Regards,

Chris

Edge118 · Jun 8, 2005

I looked close and saw that the

Code:

<%=values[i]%>

is populating the list box, but what does the

Code:

{ Response.Write("selected"); }

do?

"Pin me. Perl me."

Regards,

Chris

icrf · Jun 8, 2005

Well, as it looks, it prints the string "selected" and according to its placement and the HTML spec, that would make that particular list item appear selected by default in the users browser (if the value of "Category" from the query string matches the current list item being added)

"Pin me. Perl me."
heh, .NET's just my day job, Perl's where the fun is.

________________________________________
Andrew

RTomes · Jun 8, 2005

It's a C# IF statement.

if (if some condition is true)
{
then do some action here between the curly brackets

}

or else if it is not true then just skip the action in the curly brackets and resume to the next line of code which is here.

ca8msm · Jun 10, 2005

Also, that's actually a very poor example of ASP.NET as it uses 3 things that should be avoided (these have come from classic ASP):

1) It uses include files
2) It uses Response.Write
3) It uses "inline" if statements enclosed in script tags (<% and %>).

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Simple Question - select/list box

Edge118

Programmer

Edge118

Programmer

icrf

Programmer

RTomes

Programmer

ca8msm

Programmer

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