Write c# array to aspx html page

Question

How do I take my C# array and write it to an HTML table header?

From what I've read you should be able to use cnippets to get the variable but it's not working...

C# code

protected void Page_Load(object sender, EventArgs e)
        {
            string[] tableHeaders = {
                "Urgency", 
                "Picker", 
                "CARD", 
                "Case Order", 
                "CR #", 
                "Patient", 
                "Age", 
                "ASA", 
                "Anes Consult", 
                "Procedure", 
                "Booking Surgeon", 
                "Operating Surgeon", 
                "Ready Date", 
                "Ready Time", 
                "NPO Since", 
                "EST Time", 
                "Current Location", 
                "Postop Need", 
                "Booked by", 
                "Special Equipment", 
                "Comments"
            };
        }

HTML Code You'll see in my document.write line I try to call the tableHeaders variable. And I use the javascript row variable as a counter.

<thead>
  <tr>
    <script type="text/javascript">
      for (var row = 0; row <= 21; row++) {
        document.write("+<%= tableHeaders[+row+] %>+")
      }
    </script>
   </tr>
 </thead>

Are you trying to create dynamic <th> elements in your row or just write out a list of header names? — Joel Etherton
– Joel Etherton, Commented Jul 23, 2014 at 14:53
Yes. I've just been told that you can't put C# variables in java-script so that kind of means my question isn't valid. — Frantumn
– Frantumn, Commented Jul 23, 2014 at 14:57
@Frantumn: I wouldn't say your question isn't valid as much as your attempted solution won't get the job done as you've envisioned it. Though an edit to the question might make it a little more clear. — Joel Etherton
– Joel Etherton, Commented Jul 23, 2014 at 14:59

Frantumn · Accepted Answer · 2014-07-23 15:55:24Z

1

I shouldn't have been trying to use Java-script to do this. The following worked perfectly.

 <%
     for (int td = 0; td <= 20; td++)
     {
         Response.Write("<td>" + tableHeaders[td] + "</td>");
     }
 %>

answered Jul 23, 2014 at 15:55

Frantumn

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Comments

D Stanley · Accepted Answer · 2014-07-23 14:51:19Z

0

You are creating a local variable in Page_Load then trying to access it from the page script. You can make it a class member instead:

(outside of Page_Load or any other method):

private string[] tableHeaders = {
    "Urgency", 
    "Picker", 
    "CARD", 
    "Case Order", 
    "CR #", 
    "Patient", 
    "Age", 
    "ASA", 
    "Anes Consult", 
    "Procedure", 
    "Booking Surgeon", 
    "Operating Surgeon", 
    "Ready Date", 
    "Ready Time", 
    "NPO Since", 
    "EST Time", 
    "Current Location", 
    "Postop Need", 
    "Booked by", 
    "Special Equipment", 
    "Comments"
};

answered Jul 23, 2014 at 14:51

D Stanley

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Comments

Joel Etherton · Accepted Answer · 2014-07-23 14:58:47Z

0

Assuming you want to create actual header cells for your table, you should be able to do it all within c# code behind unless you have some need to dump things into JavaScript. Add an ID to your <tr> element and a runat attribute:

<thead>
    <tr ID="headerRow" runat="server">
    </tr>
</thead>

Then in your page load you can add each header element individually:

protected void Page_Load(object sender, EventArgs e)
{
    string[] tableHeaders = { // blah blah };

    foreach(var header in tableHeaders)
    {
        var tmp = new TableHeaderCell();
        tmp.ID = "TH_" + header;
        tmp.Text = header;
        headerRow.Cells.Add(tmp);
    }
}

Then when the page renders, it should render each one out as a <th> element within your row.

answered Jul 23, 2014 at 14:58

Joel Etherton

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4 Comments

Frantumn Over a year ago

I like this answer, I get an error though. Error 3 Argument 1: cannot convert from 'System.Web.UI.WebControls.TableHeaderCell' to 'System.Web.UI.HtmlControls.HtmlTableCell' I probably need some using statements. (I'm still getting used to C#).

Frantumn Over a year ago

where does your variable headerRow come from ?

Frantumn Over a year ago

TableRow headerRow = new TableRow(); needs to be above your for each.

Joel Etherton Over a year ago

@Frantumn: No it doesn't. If you read the entire answer, you'll see that the headerRow is specified by the ID in the markup. That's why you need runat="server" as a part of the markup. Because headerRow is specified without any specific parent it should be available without using FindControl("headerRow"). If you have runat="server" specified on a parent element (such as table perhaps) then you would need to use FindControl.

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