在ASP.NET中的Response.Write函數中使用Alert

Question

我有這樣的數據庫代碼

try
{
    string strConnectionString = ConfigurationManager.ConnectionStrings["SqlServerCstr"].ConnectionString;

    SqlConnection myConnection = new SqlConnection(strConnectionString);
    myConnection.Open();

    string hesap = Label1.Text;
    string musteriadi = DropDownList1.SelectedItem.Value;
    string avukat = DropDownList2.SelectedItem.Value;

    SqlCommand cmd = new SqlCommand("INSERT INTO AVUKAT VALUES (@MUSTERI, @AVUKAT, @HESAP)", myConnection);

    cmd.Parameters.AddWithValue("@HESAP", hesap);
    cmd.Parameters.AddWithValue("@MUSTERI", musteriadi);
    cmd.Parameters.AddWithValue("@AVUKAT", avukat);
    cmd.Connection = myConnection;

    SqlDataReader dr = cmd.ExecuteReader(System.Data.CommandBehavior.CloseConnection);
    Response.Redirect(Request.Url.ToString());
    myConnection.Close();
}
catch (Exception)
{
    Response.Write("<h2>ERROR</h2>");
}

它工作正常但我想在catch函數中調用javascript警報函數。

我試過這個

Response.Write("<script language=javascript>alert('ERROR');</script>);

但是有一個錯誤

如何在javascript alert功能中顯示錯誤消息？

Answer 1

更換：

Response.Write("<script language=javascript>alert('ERROR');</script>);

同

Response.Write("<script language=javascript>alert('ERROR');</script>");

換句話說，你缺少一個右"在年底Response.Write語句。

值得一提的是，屏幕截圖中顯示的代碼似乎正確包含結束雙引號，但總體上最好的選擇是使用ClientScriptManager.RegisterScriptBlock方法：

var clientScript = Page.ClientScript;
clientScript.RegisterClientScriptBlock(this.GetType(), "AlertScript", "alert('ERROR')'", true);

這將使用<script>標記包裝腳本並將<script>編寫到頁面中。

Answer 2

嘗試使用RegisterScriptBlock 。 鏈接示例：

public void Page_Load(Object sender, EventArgs e)
{
    // Define the name and type of the client scripts on the page.
    String csname1 = "PopupScript";
    String csname2 = "ButtonClickScript";
    Type cstype = this.GetType();

    // Get a ClientScriptManager reference from the Page class.
    ClientScriptManager cs = Page.ClientScript;

    // Check to see if the startup script is already registered.
    if (!cs.IsStartupScriptRegistered(cstype, csname1))
    {
      String cstext1 = "alert('Hello World');";
      cs.RegisterStartupScript(cstype, csname1, cstext1, true);
    }

    // Check to see if the client script is already registered.
    if (!cs.IsClientScriptBlockRegistered(cstype, csname2))
    {
      StringBuilder cstext2 = new StringBuilder();
      cstext2.Append("<script type=\"text/javascript\"> function DoClick() {");
      cstext2.Append("Form1.Message.value='Text from client script.'} </");
      cstext2.Append("script>");
      cs.RegisterClientScriptBlock(cstype, csname2, cstext2.ToString(), false);
    }
}

Answer 3

string str = "Error mEssage";
Response.Write("<script language=javascript>alert('"+str+"');</script>");

Answer 4

你也可以使用Response.Write（“alert（'Error'）”）;

Answer 5

以這種方式連接分隔斜杠和單詞腳本的字符串。

Response.Write("<script language='javascript'>alert('Especifique Usuario y Contraseña');</" + "script>");

Answer 6

用這個....

string popupScript = "<script language=JavaScript>";
popupScript += "alert('Please enter valid Email Id');";
popupScript += "</";
popupScript += "script>";
Page.RegisterStartupScript("PopupScript", popupScript);

Answer 7

你可以簡單地寫

try
 {
    //Your Logic and code
 }
 catch (Exception ex)
 {
    //Error message in  alert box
    Response.Write("<script>alert('Error :" +ex.Message+"');</script>");
 }

它會工作正常