how to apply javascript to asp.net control

Question

how to apply javascript to asp.net control ? expalin with examplee..

Satyapriya Nayak · Answer

Untitled Page function Validate() { var UName=document.getElementById('TextBox_user_name'); var Password=document.getElementById('TextBox_password'); if((UName.value=='') || (Password.value=='')) { alert('UserName or Password should not be blank'); return false; } else { return true; } } BackColor="#CCFF99" OnClientClick="Validate()" onclick="btn_login_Click" /> using System; using System.Collections; using System.Configuration; using System.Data; using System.Linq; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.HtmlControls; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Xml.Linq; using System.Data.SqlClient; namespace Login_related_details { public partial class Login : System.Web.UI.Page { string strConnString = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString; SqlCommand com; SqlDataAdapter sqlda; string str; DataTable dt; int RowCount; protected void btn_login_Click(object sender, EventArgs e) { string UserName = TextBox_user_name.Text.Trim(); string Password = TextBox_password.Text.Trim(); SqlConnection con = new SqlConnection(strConnString); con.Open(); str = "Select * from Login"; com = new SqlCommand(str); sqlda = new SqlDataAdapter(com.CommandText, con); dt = new DataTable(); sqlda.Fill(dt); RowCount = dt.Rows.Count; for (int i = 0; i { UserName = dt.Rows[i]["UserName"].ToString(); Password = dt.Rows[i]["Password"].ToString(); if (UserName == TextBox_user_name.Text && Password == TextBox_password.Text) { Session["UserName"] = UserName; Response.Redirect("Details.aspx"); } else { lb1.Text = "Invalid User Name or Password! Please try again!"; } } } } }

Sreejesh SP · Answer

Dear vihag, I will explain a validation for using javascript MaxLength="50" runat="server"> function LettersWithSpaceOnly(evt) { evt = (evt) ? evt : event; var charCode = (evt.charCode) ? evt.charCode : ((evt.keyCode) ? evt.keyCode : ((evt.which) ? evt.which : 0)); if (charCode > 32 && (charCode 90) && (charCode 122)) { return false; } return true; } This script use to allow alphabets in textbox,not allow numeric charecter in text box,please try this code and again implement another j script code by using this method Thanks sreejesh

Vishal Gilbile · Answer

Hello Friend, Kindly go through the following links. http://www.c-sharpcorner.com/UploadFile/17e8f6/controlling-button-execution-through-javascript-function/ http://www.c-sharpcorner.com/UploadFile/17e8f6/repeater-control-in-Asp-Net/ http://www.c-sharpcorner.com/uploadfile/17e8f6/how-to-getset-values-of-controls-in-Asp-Net-using-javascript/ http://www.c-sharpcorner.com/uploadfile/17e8f6/populate-a-dropdownlist-control-using-javascript-in-Asp-Net/ http://www.c-sharpcorner.com/uploadfile/17e8f6/how-to-create-a-calendar-control-in-Asp-Net/ Hope that solves your problem. Kindly mark the answer as accepted if it helps you. With Regards, Vishal Gilbile.

how to apply javascript to asp.net control

Answers (3)