如何从用 asp.net 中的 scriptmanager.registerclientscript 编写的 javascript 确认框返回值？

Posted 2023-02-22

【中文标题】如何从用 asp.net 中的 scriptmanager.registerclientscript 编写的 javascript 确认框返回值？

【英文标题】：How to return value from javascript confirm box written in scriptmanager.registerclientscript in asp.net.?

【发布时间】：2012-04-09 21:26:44

【问题描述】：

如何从asp.net中scriptmanager.registerclientscript编写的javascript确认框返回值？

实际上我想在gridview的文本框的文本更改事件上给出确认框。如果用户单击是，那么我想更新更改的值，如果用户单击否，则它应该恢复为旧值。

我的虚拟代码是这样的：

Protected Sub GridViewCreateInvoice_QuantityTextChanged(ByVal sender As Object, ByVal e As EventArgs)
        Dim gr As GridViewRow
        Dim i As Boolean
        Dim txtqty, txtupdatedQty As TextBox
        Dim txtoqty, qty As String
        Dim result As MsgBoxResult
        'Dim dtPOFulfillmentInfo As DataTable

        Try

            txtqty = DirectCast(sender, TextBox)
            gr = txtqty.NamingContainer


            '' txtoqty = GridViewCreateInvoice.Rows(gr.DataItem("originalqty")).ToString()
            txtoqty = DataBinder.Eval(gr.DataItem, "originalqty").ToString()
            qty = DataBinder.Eval(gr.DataItem, "qty").ToString()


            If Not ((txtqty.Text = String.Empty And Not txtqty.Text.Trim = "" And Not txtqty.Text.Contains(" ")) And (txtoqty = String.Empty)) Then

                If txtqty.Text > txtoqty Then
                     ScriptManager.RegisterClientScriptBlock(Page, Me.GetType(), "Confirm Quantity Changed", return confirm("Are you sure you want to continue"), True)

                    If i = True Then
                        DataBinder.Eval(gr.DataItem, "qty") = txtqty.Text
                    Else
                        txtqty.Text = DataBinder.Eval(gr.DataItem, "qty").ToString()
                    End If
                Else
                     ScriptManager.RegisterClientScriptBlock(Page, Me.GetType(), "Confirm Quantity Changed", return confirm("Are you sure you want to continue"), True)

                    If i = True Then
                        DataBinder.Eval(gr.DataItem, "qty") = txtqty.Text
                    Else
                        txtqty.Text = DataBinder.Eval(gr.DataItem, "qty").ToString()
                    End If
                End If
            End If
        Catch ex As Exception

            Common.WriteLog(ex.Message)
            Common.WriteLog((ex.StackTrace))
            Response.Redirect("~/Error.aspx", False)
        End Try
    End Sub 

【参考方案1】：

I dont know what else logic you had implemented..
its a simple solution may be it helps u..

put a label for e.g lblScript in your page

then simply set its text from server side i.e
lblScript.Text = 
"<script> var x=window.confirm('Are you sure you are ok?')
if (x)
window.alert('Good!') //
else
window.alert('Too bad')
</script>";    

【参考方案2】：

我建议不要在 TextBox'TextChanged 事件上回帖 (AutoPostback=true)。

相反，我建议在客户端做所有事情。一种方法是处理onchange 事件以显示javascript confirm 并在用户单击cancel 时立即恢复旧值：

function confirmUpdate(sender,message)
    var update = confirm(message);
    if(update)
        return true;
    else
        sender.value = sender.defaultValue;
        return false;
    

Text defaultValue Property

您可以在服务器端在RowDataBound 的GridView 中注册此功能：

protected void gridview1_RowDataBound(object sender, GridViewRowEventArgs e)

    if (e.Row.RowType == DataControlRowType.DataRow)
    
        TextBox txtqty = (TextBox)e.Row.FindControl("txtqty");
        txtqty.Attributes.Add("onchange", "return confirmUpdate(this, 'Are you sure you want to continue')");
    

【讨论】：

非常感谢蒂姆...我要试试这个..:)