CODEWITHSUNDEEP
c#javascriptasp.net
sifeee
sifeee

Reputation: 13

How to write this Javascript coding in C# code behind?

<%--Confirmation Box--%>
<script type="text/javascript" language="javascript">
    function alertbox() {

      if (confirm("Are you sure?") == true) 
          {
              document.getElementById('<%= hdnYesNo.ClientID %>').value = "YES";
          }
          else 
          {
              document.getElementById('<%= hdnYesNo.ClientID %>').value = "NO";
          }

        }
    </script>

How to rewrite this code in C# as codebehind? I would like have a confirm box with yes or no buttons.

Upvotes: 0

Views: 27290

Answers (5)

Giuseppe B
Giuseppe B

Reputation: 1294

another option is to create the script in the /View folder and user razor for generating the script.

then you could point to the page in the tag like 

<script src="~/ScriptGenerator/MyScript" />

for pointing the controller ScriptGeneratorController that expose the action MyScript

Upvotes: 0

kiran
kiran

Reputation: 305

you can use like this way

Page.ClientScript.RegisterStartupScript(this.GetType(), "Confi", "if(confirm('Are you sure?') == true){  document.getElementById('txtValue').value ='YES';}else{document.getElementById('txtValue').value ='NO';}", true);

Upvotes: 2

Maverick
Maverick

Reputation: 4498

You need javascript for this, it's not possible in code behind. Code behind is run on the server before the page is sent to the user, javascript is run on the user's computer.

If you want to get access to their answer in code behind (possible and straightforward), you can use ajax or you can postback.

If you want to have this popup to come up when you press on a .Net asp:button control, then you can put a javascript function in the "OnClientClick" attribute of the control.

EDIT: If you need help with any of the above, let us know and help will be provided :).

EDIT2: Due to the discussion below, I guess I should clarify: You can (obviously) construct javascript on the server side before passing it to the client, but the example you gave is NOT a case where you should be doing that (an example of where this might be a good idea would be a script that has variables read from a database or something similar that doesn't need to be dynamic between page loads).

Upvotes: 1

Brian Ogden
Brian Ogden

Reputation: 19242

protected void Page_Load(object sender, System.EventArgs e)
{    
    string csName = "PopupScript";
    Type csType = this.GetType();
    ClientScriptManager csm = Page.ClientScript;

    if (!csm.IsStartupScriptRegistered(csType, csName)) {
        StringBuilder sb = new StringBuilder();
        sb.Append("<script>");
        sb.Append("function alertbox() {");
        sb.Append("if (confirm('Are you sure?') == true) ");
        sb.Append("{");
            sb.Append("document.getElementById('" + hdnYesNo.ClientID + "').value = 'YES';");
        sb.Append("}");
        sb.Append("else");
        sb.Append("{");
        sb.Append("document.getElementById('" + hdnYesNo.ClientID + "').value = 'NO';");
        sb.Append("}");
        sb.Append("</script>");


        csm.RegisterStartupScript(csType, csName, sb.ToString());
    }
}

Upvotes: 11

Robert
Robert

Reputation: 3302

You can use ClientScriptManager class and its methods, for example RegisterClientScriptBlock. Depends on when you want the javascript to execute.

See details here:

http://msdn.microsoft.com/en-us/library/System.Web.UI.ClientScriptManager_methods.aspx

Upvotes: 1

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