Confirm Value in Javascript

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Very simple question. How do I get the value from confirm and use that value to do something?

For example...

HTML

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
    <script type="text/javascript">
        function validate()
        {
            return confirm('Are you sure to continue?');
        }
    </script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:Button ID="btn1" runat="server" Text="Press Here" OnClientClick="validate()" OnClick="btn1_Click" />
        <asp:Label ID="lb1" runat="server" />
    </div>
    </form>
</body>
</html>

With the code above I get the confirm message and I can choose "OK" or "CANCEL"

When I press OK, I want to display a message from Label.

If I press CANCEL, I want to display another message.

C#

public partial class JavascriptConfirm : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }

    protected void btn1_Click(object sender, EventArgs e)
    {
        lb1.Text = "You Pressed OK";
    }
}

With the code above ofcourse it will display only "You Pressed OK" no matter what I choose from confirm message.

Can anyone help?

Posted 16-Oct-12 17:36pm

drtiger

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3 solutions

Solution 1

You can use the following code.

C#

var str="MyValue";
if(confirm("Click OK to Proceed")==true) //If OK then TRUE
{
    alert("Your OK message"+str)
}
else
{
    alert("Your Cancel message"+str)
}

Posted 16-Oct-12 17:47pm

Arunprasath Natarajan

Comments

drtiger 16-Oct-12 23:54pm

Thank you for reply, but I want to know how to send the true/false value to code behind so I can do stuff like if(true) display some text, else display something else or do nothing.

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TheCoolCoder · Accepted Answer · 2012-10-16T18:11:00

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
    <script type="text/javascript">
     function validate()
      {
        if(confirm('Are you sure to continue?'))        
             document.getElementById('hdnConfirmResult').value='true';         
        else         
             document.getElementById('hdnConfirmResult').value='false';        
       }
    </script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:hiddenfield id="hdnConfirmResult" runat="server" value="" xmlns:asp="#unknown" />
        <asp:Button ID="btn1" runat="server" Text="Press Here" OnClientClick="validate()" OnClick="btn1_Click" />
        <asp:Label ID="lb1" runat="server" />
    </div>
    </form>
</body>
</html>

Then in CodeBehind:

C#

protected void btn1_Click(object sender, EventArgs e)
 {
     bool Confirmed= Convert.ToBoolean(hdnConfirmResult.value);//can cause exception incase the value is not true or false
     if(bConfirmed)
        lb1.Text = "You Pressed OK";
     else
        lb1.Text="";//Whatever you want to display
 }

Although i dont understand why you want to postback to the server in case the user chose to cancel. If it is just to display this message then you are doing it wrong. you can display this message using javascript itself from clientside.

Er. Gayatri · Accepted Answer · 2012-10-16T18:14:00

Hi,

you can put another hidden button for the option No. say,

ASP.NET

<asp:Button id="btnNo" runat="server" onclick="btnNo_Click" style="visibility:hidden;" />

And in the js code, when user clicks on no in confirm dialog, you have trigger the no button's click and return false to cancel current button's click.

See the Code below:

C#

if(confirm("Click OK to Proceed")==true) //If OK then TRUE
{
        return true;
}
else
{
    document.getElementById('btnNo').click();
    return false;
}

And in code behind file you have to write click event handler for btnNo same way as btn1.

C#

protected void btnNo_Click(object sender, EventArgs e)
    {
        lb1.Text = "You Pressed Cancel";
    }

Hope this helps you :)

Confirm Value in Javascript

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