How to pass value of C# variable to javascript?

Question

In button click event I am writing this code.(code behind).I know button click event

protected void button_click()
{         
    string s1 = "Computer"; 
    StringBuilder sb = new StringBuilder(); 
    sb.Append(@"<script language='javascript'>"); 
    sb.Append("document.write('<table><tbody>')";); 
   sb.Append("document.write('<tr><td>Information</td></tr>')";); 
    if(s1 == "Computer" ) 
   {
     sb.Append("<tr><td>s1</td></tr>"); 
   }
   sb.Append("document.write('</tbody></table>')";);
   sb.Append(@"</script>"); 

}

It is working but I want value of s1 not s1.I know javascript is a client side programing.I wrote this function in button click event.How can pass value of s1 that is computer to table's cell

Hans Keﬆing · Accepted Answer · 2012-07-05 11:02:08Z

4

simply

sb.Append("document.write('<tr><td>" + s1 + "</td></tr>');");

edited Jul 5, 2012 at 11:02

answered Jul 5, 2012 at 10:01

Hans Keﬆing

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Comments

BugFinder · Accepted Answer · 2012-07-05 10:01:00Z

3

Have you tried

    if(s1 == "Computer" )  
   { 
     sb.Append("<tr><td>"+s1+"</td></tr>"); 
   }

answered Jul 5, 2012 at 10:01

BugFinder

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2 Comments

Jui Test Over a year ago

When I click on button,table go to top position.I want it at bottom below buttom.I know when we use Table control in cs file like Table tb = new Table(); ,placeholder.control.Add(tb) is used.But how add dynamic table at perticular position,in this case?

BugFinder Over a year ago

Thats different to your original question.. You would probably best use ajax to add it without submitting the page, or, using a webform, submit the page and use the new value.

Steve Hobbs · Accepted Answer · 2012-07-05 10:01:04Z

3

You could change this line to:

sb.Append("<tr><td>" + s1 + "</td></tr>");

answered Jul 5, 2012 at 10:01

Steve Hobbs

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Comments

Trogvar · Accepted Answer · 2012-07-05 10:10:35Z

Your code is a bit irrelevant to the question you're asking. Your error has already been fixed by previous answers. But I will try to expand the asnwer further. If you wish to pass some value from C# to JavaScript, there're different methods.

1) You could make a protected method in a codebehind file and call it from your .aspx file, like

my.aspx

<script type="text/javascript">
var x = '<%= GetMyValue() %>';
DoFooWithX(x);
</script>

my.aspx.cs

protected string GetMyValue()
{
    return "example";
}

2) If you wish to execute some JavaScript once page finishes loading, you could also do it from your codebehind like this

my.aspx.cs

protected void Page_Load(object sender, EventArgs e)
{
    string myScript = string.Format("myVar = '{0}';", GetMyVarValue());
    ScriptManager.RegisterStartupScript(this, this.GetType(), "MyVarSetter", myScript, true);
}
private string GetMyVarValue()
{
    return "example";
}

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