login.ascx

login.ascx

<%@ Control Language="vb" AutoEventWireup="false" CodeBehind="login.ascx.vb" Inherits="Praktikum1.login" %>
<%--Harus ditaruh sebelum control validate, kaya js biasa--%>
<script type="text/javascript">
    function validateEmptyUsername(oSrc, args) {
        args.IsValid = (args.Value.length > 0);
        if (!args.IsValid) {
            $("#<%=TextBox1.ClientID%>").addClass("is-invalid");
        }
        else {
            // JQ ga bakalan perlu check, kalau ada disana dia 
            $("#<%=TextBox1.ClientID%>").removeClass("is-invalid");
        }
    }

    function validateEmptyPassword(oSrc, args) {
        args.IsValid = (args.Value.length > 0);
        if (!args.IsValid) {
            $("#<%=TextBox2.ClientID%>").addClass("is-invalid");
        }
        else {
            // JQ ga bakalan perlu check, kalau ada disana dia 
            $("#<%=TextBox2.ClientID%>").removeClass("is-invalid");
        }
    }
</script>
<div class="form-group">
    <label for="TextBox1">Username / Email</label>
    <asp:TextBox ID="TextBox1" runat="server" CssClass="form-control" Width="210px"></asp:TextBox>
    <div class="invalid-feedback">
        <asp:CustomValidator ID="CustomValidator1" 
        runat="server" 
        ErrorMessage="Username atau password kosong!"
        ClientValidationFunction="validateEmptyUsername" ControlToValidate="TextBox1" ValidateEmptyText="True"
        ></asp:CustomValidator>
    </div>
</div>
<div class="form-group">
    <label for="TextBox2">Password</label>
    <asp:TextBox ID="TextBox2" runat="server" CssClass="form-control" Width="210px" 
        TextMode="Password"></asp:TextBox>
    <div class="invalid-feedback">
        <asp:CustomValidator ID="CustomValidator2" 
        runat="server" 
        ErrorMessage="Password kosong!"
        ClientValidationFunction="validateEmptyPassword" ControlToValidate="TextBox1" ValidateEmptyText="True"
        ></asp:CustomValidator>
    </div>
</div>

<asp:Button ID="Button1" CssClass="btn btn-primary" runat="server" Text="Login" />