Javascript getting ignored because of Response.Redirect()

Question

I am currently working on asp.net using C# and I need to show a message box and confirm the input from user and redirect to another page, my code is something like this:

protected void Button1_Click(object sender, EventArgs e)
{
    System.Text.StringBuilder sb = new System.Text.StringBuilder();
    sb.Append("<script language='javascript'>");
    sb.Append("if (confirm('YES OR NO?')){ /*some javascript code*/ }");
    sb.Append("</script>");

    Page.RegisterStartupScript("FocusScript", sb.ToString());
   Response.Redirect("Default.aspx");

}

here the problem is directly getting redirected to next page without showing message box. if i remove Response.Redirect("Default.aspx"); it shows message box successfully. I think the here may be is Response.Redirect() has higher precedence compared to javascript

I tried using

sb.Append("if (confirm('YES OR NO?')){ window.location.href = \"Default.aspx"; }\");

instead of using Response.Redirect() but page didn't got redirected, what should I do to resolve this problem?

Answer 1

Do you absolutely need to handle this on the server side? Indeed this is where quite a simple thing is getting confusing.

If you could, for instance, handle it with Javascript / jQuery, you could do something simple like:

$('#Button1').click(function(){
   if (confirm("Yes or No?")){
      window.location = "/default.aspx";
   }
});

Answer 2

There is an option of using adding javascript in client click event

eg:-

<asp:button id="Button1" OnClientClick="javascript:return confirm('Are you sure?');" runat="server" onclick="Button1_Click" />

and then in the code side simple redirect the page.

Answer 3

Confirm is a JavaScript function and it executes on client side. After you register it, you immediately redirect to another page, and so the function is never executed.

Answer 4

add following code on Page_Load

Button1.Attributes.Add("onclick", "if(confirm('do you want to redirect?')){}else{return false}");

now ur button click will first trigger java confirmation modal box.

as for ur Button1 click

protected void Button1_Click(object sender, EventArgs e)
{
   Response.Redirect("Default.aspx");
}

The idea is - your codebehind Button1_Click event will be triggered only after user confirms by clicking OK

Answer 5

I think it is better to add an attribute to the button at page load and leave the button_click function to just redirect. Something like this (Page Load):

button.attribute.add("onclick","Javascript:confirmFunction();")

in button click just have this:

protected void Button1_Click(object sender, EventArgs e)
{       
   Response.Redirect("Default.aspx");    
}

finally in JS have this:

<script>
function confirmFunction()
{
    if(Confirm("Yes OR NO") 
       //Add your JS Code
       return true; //will pass onto server
    else
       //Add your JS Code
       return false; //will not go to server
}
</script>

HTH