Javascript for textbox

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Hii friends,

I want javascript for textbox that validate textbox value.
Textbox value should start with http:\\ or https:\\

I dont know javascript much..
plzz help me.

Posted 10-Jan-14 21:27pm

Aysha Patel

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Karthik_Mahalingam · Accepted Answer · 2014-01-10T23:01:00

ASP.NET

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="WebApplication1.WebForm1" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
    <script src="jquery.js.js"></script>
    <script type="text/javascript">
        var validate = function (control) {
            var value = control.value;
            if (value.substring(0, 7) == "http:\\\\" || value.substring(0, 8) == "https:\\\\")
                return true;
            else
            { alert('invalid url'); return false; }
        }
    </script>
</head>
<body>
    <form id="form1" runat="server">
        <asp:TextBox ID="txtUrl" runat="server"></asp:TextBox>
        <br />
        <asp:Button ID="btn" runat="server" Text="submit" OnClientClick="return validate(txtUrl);" />
    </form>
</body>
</html>

Sandeep Singh Shekhawat · Accepted Answer · 2014-01-10T22:04:00

In asp.net using jQuery and Javascript you can do it by following code

XML

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm2.aspx.cs" Inherits="WebApplication2.WebForm2" EnableViewState="false" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
    <script type="text/javascript" src="//ajax.googleapis.com/ajax/libs/jquery/1.10.1/jquery.min.js"></script>
   
    <script type="text/javascript">
        if (typeof String.prototype.startsWith != 'function') {
            String.prototype.startsWith = function (prefix) {
                return this.slice(0, prefix.length) == prefix;
            };
        }
        function ValidateUrl() {          
            var url = $('#<%=txtUrl.ClientID %>').val();
            if (url.startsWith("http:\\") || url.startsWith("https:\\")) {
                alert(url);
                return true;
            }
            else {
                alert("it is not valid");
                return false;
            }
        }
    </script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
   <asp:TextBox ID="txtUrl" runat="server"></asp:TextBox>
     <asp:Button ID="btnSubmit" runat="server" Text="Submit" onClientClick="return ValidateUrl()" />
    </div>
   
    </form>
</body>
</html>

Javascript for textbox

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