即使在asp.net中启用按钮也会显示禁用

Question

我在asp.net代码中添加了按钮。但它显示为禁用。

这是我的代码。

   TableCell cell15 = new TableCell();  
       cell15.Width = 100; 
       cell15.HorizontalAlign = HorizontalAlign.Left; 
       Button Apply = new Button(); 
       Apply.ID = "Apply_Button"; 
       Apply.Text = "Apply"; 
       Apply.Width = 50; 
       Apply.Height = 20; 
       Apply.Visible = true; 
       Apply.ViewStateMode = System.Web.UI.ViewStateMode.Inherit; 
       Apply.UseSubmitBehavior = true; 
       Apply.CausesValidation = true; 
       Apply.ClientIDMode = System.Web.UI.ClientIDMode.Inherit; 
       Apply.EnableTheming = true; 
       Apply.CausesValidation = true; 
       Apply.Enabled = true; 
       Apply.OnClientClick = Apply_Click(sender, e); 
       cell15.Controls.Add(Apply); 
       row8.Cells.Add(cell15); 

生成的HTML是：

<input type="submit" name="ctl00$MainContent$Apply_Button" value="Apply" 
disabled="disabled" id="MainContent_Apply_Button" style="height:20px;width:50px;"> 

Answer 1

Do you have any update panel, try to place button inside update panel 

OR（使用JavaScript）：

document.getElementById("YourButtonID").setAttribute("disabled", false); 

代码背后：

YourButtonID.disabled = false; 

Answer 2

这里是我的合作德。

public partial class UpComing : System.Web.UI.Page 


     String sel = "SELECT Cmpny_Data.C_Name, Cmpny_Data.J_location, Cmpny_Data.Copm_desc, Cmpny_Data.J_Crtra, Cmpny_Data.Cmps_Date, Cmpny_Data.Last_date, Cmpny_Data.Elg_cTRTA FROM Cmpny_Data INNER JOIN Details ON Cmpny_Data.Elg_cTRTA < Details.cpi WHERE (Details.En_no='" + Session["uname"].ToString() + "') AND (Cmpny_Data.Last_date > SYSDATETIME()) "; 
     cmd2 = new SqlCommand(sel, obj.con); 
     dr = cmd2.ExecuteReader(); 
     while (dr.Read()) 
     { 
      C_N.Text += dr[0].ToString() + '`'; 
      C_P.Text += dr[2].ToString() + '`'; 
      J_C.Text += dr[3].ToString() + '`'; 
      J_L.Text += dr[1].ToString() + '`'; 
      E_C.Text += dr[6].ToString() + '`'; 
      C_D.Text += dr[4].ToString() + '`'; 
      L_D.Text += dr[5].ToString() + '`'; 
     } 
     dr.Dispose(); 
     cmd2.Dispose(); 
     obj.con.Close(); 
     String AllCN = C_N.Text; 
     String AllCP = C_P.Text; 
     String AllJC = J_C.Text; 
     String AllJL = J_L.Text; 
     String AllEC = E_C.Text; 
     String AllCD = C_D.Text; 
     String AllLD = L_D.Text; 

     char separator = '`'; 

     String[] CNs = AllCN.Split(separator); 
     String[] CPs = AllCP.Split(separator); 
     String[] JCs = AllJC.Split(separator); 
     String[] JLs = AllJL.Split(separator); 
     String[] ECs = AllEC.Split(separator); 
     String[] CDs = AllCD.Split(separator); 
     String[] LDs = AllLD.Split(separator); 

     C_N.Text = null; 
     C_P.Text = null; 
     J_C.Text = null; 
     J_L.Text = null; 
     E_C.Text = null; 
     C_D.Text = null; 
     L_D.Text = null; 

     for (int i = 0; i < ttlq; i++) 
     { 
      TableRow row = new TableRow(); 
      for (int j = 0; j < 1; j++) 
      { 
       TableCell cell1 = new TableCell(); 
       cell1.Width = 100; 
       cell1.HorizontalAlign = HorizontalAlign.Left; 
       Label label1 = new Label(); 
       label1.ID = "Lable1"; 
       label1.Text = " Company Name : "; 
       cell1.Controls.Add(label1); 
       row.Cells.Add(cell1); 

       TableCell cell2 = new TableCell(); 
       cell2.Width = 650; 
       cell2.HorizontalAlign = HorizontalAlign.Left; 
       Label C_Name = new Label(); 

       C_Name.Width = 650; 
       C_Name.Height = 20; 
       C_Name.ID = "Cmp_Name"; 
       C_Name.Text = CNs[i]; 
       cell2.Controls.Add(C_Name); 
       row.Cells.Add(cell2); 
      } 
      table1.Rows.Add(row); 

      TableRow row1 = new TableRow(); 
      for (int k = 0; k < 1; k++) 
      { 
       TableCell cell3 = new TableCell(); 
       cell3.Width = 100; 
       cell3.HorizontalAlign = HorizontalAlign.Left; 
       Label label2 = new Label(); 
       label2.ID = "Lable2"; 
       label2.Text = " Company Profile : "; 
       cell3.Controls.Add(label2); 
       row1.Cells.Add(cell3); 

       TableCell cell4 = new TableCell(); 
       cell4.Width = 650; 
       cell4.HorizontalAlign = HorizontalAlign.Left; 
       Label C_Prof = new Label(); 
       C_Prof.Width = 650; 
       C_Prof.Height = 10; 
       C_Prof.ID = "Cmp_Prf"; 
       C_Prof.Text = CPs[i]; 
       cell4.Controls.Add(C_Prof); 
       row1.Cells.Add(cell4); 
      } 
      table1.Rows.Add(row1); 

      TableRow row2 = new TableRow(); 
      for (int k = 0; k < 1; k++) 
      { 
       TableCell cell5 = new TableCell(); 
       cell5.Width = 100; 
       cell5.HorizontalAlign = HorizontalAlign.Left; 
       Label label3 = new Label(); 
       label3.ID = "Lable3"; 
       label3.Text = " Company Profile : "; 
       cell5.Controls.Add(label3); 
       row2.Cells.Add(cell5); 

       TableCell cell6 = new TableCell(); 
       cell6.Width = 650; 
       cell6.HorizontalAlign = HorizontalAlign.Left; 
       Label J_Crit = new Label(); 
       J_Crit.Width = 650; 
       J_Crit.Height = 10; 
       J_Crit.ID = "Job_Crit"; 
       J_Crit.Text = JCs[i]; 
       cell6.Controls.Add(J_Crit); 
       row2.Cells.Add(cell6); 
      } 
      table1.Rows.Add(row2); 

      TableRow row3 = new TableRow(); 
      for (int k = 0; k < 1; k++) 
      { 
       TableCell cell7 = new TableCell(); 
       cell7.Width = 100; 
       cell7.HorizontalAlign = HorizontalAlign.Left; 
       Label label4 = new Label(); 
       label4.ID = "Lable4"; 
       label4.Text = " Job Location : "; 
       cell7.Controls.Add(label4); 
       row3.Cells.Add(cell7); 

       TableCell cell8 = new TableCell(); 
       cell8.Width = 650; 
       cell8.HorizontalAlign = HorizontalAlign.Left; 
       Label J_Loc = new Label(); 
       J_Loc.Width = 650; 
       J_Loc.Height = 10; 
       J_Loc.ID = "Job_Location"; 
       J_Loc.Text = JLs[i]; 
       cell8.Controls.Add(J_Loc); 
       row3.Cells.Add(cell8); 
      } 
      table1.Rows.Add(row3); 

      TableRow row4 = new TableRow(); 
      for (int k = 0; k < 1; k++) 
      { 
       TableCell cell9 = new TableCell(); 
       cell9.Width = 100; 
       cell9.HorizontalAlign = HorizontalAlign.Left; 
       Label label5 = new Label(); 
       label5.ID = "Lable5"; 
       label5.Text = " Eligibility Criteria : "; 
       cell9.Controls.Add(label5); 
       row4.Cells.Add(cell9); 

       TableCell cell10 = new TableCell(); 
       cell10.Width = 650; 
       cell10.HorizontalAlign = HorizontalAlign.Left; 
       Label E_Crit = new Label(); 
       E_Crit.Width = 650; 
       E_Crit.Height = 10; 
       E_Crit.ID = "Elg_Crit"; 
       E_Crit.Text = ECs[i]; 
       cell10.Controls.Add(E_Crit); 
       row4.Cells.Add(cell10); 
      } 
      table1.Rows.Add(row4); 

      TableRow row5 = new TableRow(); 
      for (int k = 0; k < 1; k++) 
      { 
       TableCell cell11 = new TableCell(); 
       cell11.Width = 100; 
       cell11.HorizontalAlign = HorizontalAlign.Left; 
       Label label6 = new Label(); 
       label6.ID = "Lable6"; 
       label6.Text = " Campus Date : "; 
       cell11.Controls.Add(label6); 
       row5.Cells.Add(cell11); 

       TableCell cell12 = new TableCell(); 
       cell12.Width = 650; 
       cell12.HorizontalAlign = HorizontalAlign.Left; 
       Label C_Date = new Label(); 
       C_Date.Width = 650; 
       C_Date.ID = "Camp_Date"; 
       C_Date.Text = CDs[i]; 
       cell12.Controls.Add(C_Date); 
       row5.Cells.Add(cell12); 
      } 
      table1.Rows.Add(row5); 

      TableRow row7 = new TableRow(); 
      for (int k = 0; k < 1; k++) 
      { 
       TableCell cell13 = new TableCell(); 
       cell13.Width = 100; 
       cell13.HorizontalAlign = HorizontalAlign.Left; 
       Label label7 = new Label(); 
       label7.ID = "Lable7"; 
       label7.Text = " Last Date : "; 
       cell13.Controls.Add(label7); 
       row7.Cells.Add(cell13); 

       TableCell cell14 = new TableCell(); 
       cell14.Width = 650; 
       cell14.HorizontalAlign = HorizontalAlign.Left; 
       Label L_Date = new Label(); 
       L_Date.Width = 650; 
       L_Date.ID = "Last_Date"; 
       L_Date.Text = LDs[i]; 
       cell14.Controls.Add(L_Date); 
       row7.Cells.Add(cell14); 
      } 
      table1.Rows.Add(row7); 

      TableRow row8 = new TableRow(); 
      for (int k = 0; k < 1; k++) 
      { 
       TableCell cell15 = new TableCell(); 
       cell15.Width = 100; 
       cell15.HorizontalAlign = HorizontalAlign.Left; 
       Button Apply = new Button(); 
       Apply.ID = "Apply_Button"; 
       Apply.Text = "Apply"; 
       Apply.Width = 50; 
       Apply.Height = 20; 
       Apply.Visible = true; 
       Apply.ViewStateMode = System.Web.UI.ViewStateMode.Inherit; 
       Apply.UseSubmitBehavior = true; 
       Apply.CausesValidation = true; 
       Apply.ClientIDMode = System.Web.UI.ClientIDMode.Inherit; 
       Apply.EnableTheming = true; 
       Apply.CausesValidation = true; 
       Apply.Enabled = true; 
       Apply.Click += Apply_Click; 
       cell15.Controls.Add(Apply); 
       row8.Cells.Add(cell15); 

       TableCell cell16 = new TableCell(); ; 
       cell16.Width = 100; 
       cell16.HorizontalAlign = HorizontalAlign.Left; 
       Label Alert = new Label(); 
       //Alert.Text = dr1.ToString(); 
       Alert.Text = "You have applied for this campus. If you are not interested for this campus, please contact T&P Cell."; 
       Alert.Font.Bold = true; 
       cell16.Controls.Add(Alert); 
       row8.Cells.Add(cell16); 


       openConn conn = new openConn(); 
       conn.checkdb(); 
       String sel3 = "Select * from Student_Company where [Enrollment]='" + Session["uname"].ToString() + "' and ([Cmpny_Name]='" + CNs[i] + "')"; 
       cmd3 = new SqlCommand(sel3, conn.con); 
       dr1 = cmd3.ExecuteReader(); 
       if (dr1.HasRows) 
       { 
        Alert.Visible = true; 
        Apply.Visible = false; 
        dr1.Dispose(); 
        cmd3.Dispose(); 
        conn.con.Close(); 
       } 
       else 
       { 
        Alert.Visible = false; 
        Apply.Visible = true; 
       } 
      } 
      table1.Rows.Add(row8); 

      //table1.BorderWidth = 1; 

     } 
    } 

} 

protected void Apply_Click(object sender, EventArgs e) 
{ 
    openConn obj = new openConn(); 
    obj.checkdb(); 
    cmd4 = new SqlCommand("Insert into Student_Company Values('" + Session["uname"].ToString() + "', '" + C_Name.Text + "')", obj.con); 
    cmd4.ExecuteNonQuery(); 
    cmd4.Dispose(); 
    obj.con.Close(); 
} 

}