如何在ASP.NET C＃中获得确认框返回值

Question

I know a number of people have asked similar questions already. I've read tons of the answers given but none seems to solve my problem. I have a form that allows the user to select a file and pick a date that the file should be imported from. When the date is less (before) the last import period (which is a field in database keeping track of last import dates), I want to display a confirmbox to alert the user that continuing with the import could overwrite some data. The user can choose Yes to continue with import or No to cancel import. I have tried the

onClientClick

method of the

asp:Button

control. The problem with that was, it gets fired immediately the user clicks the submit button and I don't want to display the confirm box until I have checked with the last import period which will be done on the server-side C# . I have tried writing the return value to a hidden field like this:

if (confirm("This Import Process Will Overwrite Existing Data. Do You Want to Continue?")) {
            document.getElementById("ans").value = "Yes";
            return true;
        } else {
            document.getElementById("ans").value = "No";
            return false;
        }

That did not work either. I have tried the solution from here: Javascript confirm message problem

Somehow, I can't seem to get it to work with my solution because they have some updatePanel they are using. I am using just the DatePicker , a DropDownList (for selecting which client to import data for) and a hidden field (if required). Please help if you can. I can be a tweak of any of the above or a completely new solution. Thanks.

Answer 1

Try this , Its work fine for me :

    var c = confirm('Your message');
    if (c == true) 
    {
        document.getElementById('<%= HiddenField1.ClientID %>').value = 1;
    }
    else 
    {
        document.getElementById('<%= HiddenField1.ClientID %>').value = 0;
    }

You can access the HiddenField in your code behind .

Answer 2

Try this..You will get the value yes or no to hidden field

<script type="text/javascript">
    function ShowConform() {
        var confirm_value = document.createElement("INPUT");
        confirm_value.type = "hidden";
        confirm_value.name = "confirm_value";
        if (confirm("Do you want to save data?")) {
            confirm_value.value = "Yes";
        } else {
            confirm_value.value = "No";
        }

        var cn = document.forms[0].appendChild(confirm_value).value;
        //alert(cn);
         var c=document.getElementById('<%= hiddenfeid.ClientID %>').value
         c = cn;
        // alert(c);

    }

</script>