javascript - 无法将客户端消息传递到服务器端

Question

我正在尝试使用以下代码从服务器端发出带有"is"或“否”选项的警报消息

如果我选择“确定”按钮，我可以通过“确定”或“取消”按钮收到警报，我需要将相同的消息(“确定”或“取消”)传递回服务器

这是我的代码

protected void chkboxSelectAll_CheckedChanged(object sender,EventArgs e)
{

   if(productNames.Any(s => s.Contains("Virtual")))
    {
        string str = "you have selected this type of  do u want to create a new  name for this?";
        Page.ClientScript.RegisterStartupScript(typeof(Page), "Confirm", "ConfirmApproval('" + str + "');", true);

        string confirmationValue = Request.Form["confirm_valuetype"];

        if(confirmationValue == "Yes")
        {
           // No able to come inside this  function
            ddlClpFriendlyName.Items.Add(new ListItem("Create New"));
            ddlClpFriendlyName.Items.FindByText("Create New");
            FriendlynameCle_panel.Visible = true;
        }

    }
  }

这是我的客户端功能

function ConfirmApproval(objMsg) {

        var confirm_valuetype = document.createElement("INPUT");
        confirm_valuetype.type = "hidden";
        confirm_valuetype.name = "confirm_valuetype";
        if (confirm(objMsg)) {
            alert(objMsg); // i am able to get this alert
            confirm_valuetype.value = "Yes";
        }
        else {
            confirm_valuetype.value = "No";
        }

        document.forms[0].appendChild(confirm_valuetype);
    }

我不确定为什么我无法将确认值发送回服务器端代码..任何人都可以帮助解决我犯错的情况，我将非常感激

提前致谢

Answer 1

您可以按照以下方式进行 AJAX 调用:Calling Server Side function from Client Side Script

您必须通过ajax回调到服务器页面，这将解决您的问题

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js" type="text/javascript"></script>
<script type = "text/javascript">

function ConfirmApproval(objMsg) {

        var confirm_valuetype = document.createElement("INPUT");
        confirm_valuetype.type = "hidden";
        confirm_valuetype.name = "confirm_valuetype";
        if (confirm(objMsg)) {
            alert(objMsg); // i am able to get this alert
            confirm_valuetype.value = "Yes";
        }
        else {
            confirm_valuetype.value = "No";
        }

        callServer(confirm_valuetype);
    }

function callServer(val) {
    $.ajax({
        type: "POST",
        url: "PAgeName.aspx/AlertReply",
        data: '{name: "' + val + '" }',
        contentType: "application/json; charset=utf-8",
        dataType: "json",
        success: OnSuccess,
        failure: function(response) {
            alert(response.d);
        }
    });
}
function OnSuccess(response) {
    alert(response.d);
}
</script>


Server code 

[System.Web.Services.WebMethod]
public static string AlertReply(string name)
{
    ///get value and do processing 
}

<小时/>

我认为问题是

   string str = "you have selected this type of  do u want to create a new  name for this?";
        Page.ClientScript.RegisterStartupScript(typeof(Page), "Confirm", "ConfirmApproval('" + str + "');", true);

使用这一行，一旦整个页面在客户端加载完毕，代码就会被执行。这意味着隐藏字段是在 C# 代码执行完成后创建的。

这意味着你这部分代码

  string confirmationValue = Request.Form["confirm_valuetype"];

    if(confirmationValue == "Yes")
    {
       // No able to come inside this  function
        ddlClpFriendlyName.Items.Add(new ListItem("Create New"));
        ddlClpFriendlyName.Items.FindByText("Create New");
        FriendlynameCle_panel.Visible = true;
    }

在 html 页面中创建文件之前执行。

您可以在 html 页面加载后访问字段，然后单击按钮。