How to pass values to javascript from code behind

Hi ,

Basically I want to display a popup box only at a specific time in asp.net application. so i'm using the following code..

aspx page :

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<head runat="server">

    <title>Untitled Page</title>

    <script type="text/javascript">

function timedMsg()

{

var t=setTimeout("alert('good morning!')",6000);

}

</script>

</head>

C# code :

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protected void Button1_Click(object sender, EventArgs e)

    {

        StringBuilder script = new StringBuilder();

        script.Append("<script type=\"text/javascript\">");

        script.Append("timedMsg();");

        script.Append("</script>");

        Page.ClientScript.RegisterClientScriptBlock(typeof(object), "JavaScriptBlock", script.ToString());

    }

this works fine but i dont want to set settimeout as fixed as 6000. i need to retrieve value from database and assign it to settimeout. so i modified the coding as below..

aspx page :

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<head runat="server">

    <title>Untitled Page</title>

    <script type="text/javascript">

function timedMsg(var x)

{

var t=setTimeout("alert('I am displayed after 3 seconds!')",x);

}

</script>

</head>

C# code :

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protected void Button1_Click(object sender, EventArgs e)

    {

        int x = 6000;

        StringBuilder script = new StringBuilder();

        script.Append("<script type=\"text/javascript\">");

        script.Append("timedMsg("+x+");");

        script.Append("</script>");

        Page.ClientScript.RegisterClientScriptBlock(typeof(object), "JavaScriptBlock", script.ToString());

    }

but this code is not working. the alert box is not popping up. is this a correct method to pass values to the script?. or what else to be done to meet the requirement?.. pls help me..

thanks..

Oct 28 '10 #1

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10137

Frinavale

9,735

Expert Mod 8TB

In your C# code, create a Public or Protected property that can be called by the ASP code to retrieve the the value from the database:

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public string TimeoutValue{

  get{

    //in here return the value from the database

    return "6000"

  }

}

Now you have to change the timedMsg JavaScript function in your ASP code. Add the ASP code that calls the TimeoutValue property and to write it into the page.

Recall, anything between <% %> is executed on the server. So, to write something into the HTML you need to call the Response.Write() method like this:

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<%Response.Write("hello world")%>

.

A short hand for <%Response.Write()%> is <%= %>.

So, we need to change your timedMsg JavaScript method to print the TimeoutValue property into the page using the Response.Write() technique I was just talking about:

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 function timedMsg(var x)

{

  var t=setTimeout("alert('I am displayed after 3 seconds!')",<%=TimeoutValue %>);

}

-Frinny

Oct 29 '10 #2

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