javascript确认asp.net按钮从未提交？

Question

i have a regular asp:button. I am working in .Net 3.5. I've tried adding a js confirm to the button with the OnClientClick attribute as well as adding in code-behind and the result is the same. No matter what the user clicks in the confirm pop-up the form will not submit??

BtnDeleteSelected.Attributes.Add("onclick", "return confirm('Are you sure you want to delete?');");

The confirm dialog appears and if i select "OK" it still does not submit.. Any ideas? thanks.

Answer 1

That's because you should not be returning in all cases. If you view the source of the page and look for the button markup, you are likely to see this...

onclick="return confirm('Ok?'); __doPostback();"

The __doPostback invocation is inserted automatically by the ASP.NET framework in some cases. Since you return immediately regardless of the result of confirm , the postback never fires. The ultimate solution would be to not to set the onclick attribute, but instead use an unobtrusive approach . However, if there is pressing reason to control this on the server-side via onclick, you can use a simple if statement and only return when they press "Cancel"...

string js = "if(!confirm('Are you sure you want to delete?')) return false;";
BtnDeleteSelected.Attributes.Add("onclick", js);

Answer 2

I had this problem too. I was using adding the client side javascript in the OnItemCreated code of a datagrid like this:

 myTableCell = e.Item.Cells(iDeleteColumnNumber) 'Delete Button Column
 myDeleteButton = myTableCell.Controls(1)

 If myDeleteButton.UniqueID = "lbtnDelete" Then
    myDeleteButton.Attributes.Add("onclick", "if(!confirm('OK to Delete?'))return false;")
 End If

For some reason that didn't work. I then moved the JavaScript to the <asp:linkbutton> in the design view like this:

   <asp:LinkButton id="lbtnDelete" runat="server" CssClass="link-text" Text="<img border=0 src=../images/icons/icon-delete.gif alt=Delete>"
 CommandName="Delete" CausesValidation="false" OnClientClick="if(!confirm('OK to Delete?'))return false;"></asp:LinkButton>

And that worked for me.

Answer 3

Do you have to return TRUE if validation passes? Meaning, if confirm() returns false I don't think the form will submit.

Answer 4

Your code looks OK on the surface. Do you have any validators that might be preventing it being submitted? Try adding BtnDeleteSelected.CausesValidation = false to prevent the delete button calling any client-side validators.

Answer 5

Please try calling doPostBack function ;)

I mean:

BtnDeleteSelected.Attributes.Add("onclick", "CheckConfirm();");

<script language="javascript">
function CheckConfirm()
{
    if ( confirm('Are you sure you want to delete?') )
        __doPostBack('BtnDeleteSelected','');
    else
        return false;

    return true;
}
</script>

Hope that helps,