CODEWITHSUNDEEP
javascriptc#asp.netvalidation
Rahul Hendawe
Rahul Hendawe

Reputation: 912

How to prevent server side operations when Javascript Validation returns false?

I'm trying to apply some client side validations using Javascript which is working fine, But even when validation returns false the form goes to server side methods ex. btnSubmit_Click() It may be happening because I'm calling the JavaScript function on btnSubmit like below:

<asp:Button ID="btnSubmit" runat="server" Text="Submit" onclick="btnSubmit_Click" OnClientClick="Javascript:validate()"/>

I wants to check whether every Textbox values are valid or not, Then if all are valid then perform server side call i.e btnSubmit_Click() event else remain on same form until all values of TextBoxes are valid.

How to achieve this on single button?

Below is complete JavaScript function and aspx code:

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
    <script language="javascript" type="text/javascript">
        function validate() {
            var summary = "";
            summary += isvalidFirstname();
            summary += isvalidEmail();
            summary += isvalidphoneno();
            if (summary != "") {
                alert(summary);
                return false;
            }
            else {
                return true;
            }

        }
        function isvalidphoneno() {

            var uid;
            var temp = document.getElementById("<%=txtPhone.ClientID %>");
            uid = temp.value;
            var re;
            re = /^[0-9]d(10)/;
            var digits = /\d(10)/;
            if (uid == "") {
                return ("Please enter phoneno" + "\n");
            }
            else if (re.test(uid)) {
                return "";
            }

            else {
                return ("Phoneno should be digits only" + "\n");
            }
        }
        function isvalidFirstname() {
            var uid;
            var temp = document.getElementById("<%=txtName.ClientID %>");
            uid = temp.value;
            var re = /^[a-zA-Z ]+$/
            if (uid == "") {
                return ("Please enter firstname" + "\n");
            }
            else if (re.test(uid)) {
                return "";

            }
            else {
                return ("FirstName accepts Characters and spaces only" + "\n");
            }
        }
        function isvalidEmail() {
            var uid;
            var temp = document.getElementById("<%=txtEmail.ClientID %>");
            uid = temp.value;
            var re = /\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*/;
            if (uid == "") {
                return ("Please Enter Email" + "\n");
            }
            else if (re.test(uid)) {
                return "";
            }
            else {
                return ("Email should be in the form ex:[email protected]" + "\n");
            }
        }
</script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <fieldset>
    <legend>Employee Registration Form</legend>
    <table>
    <tr>
    <td>Name: </td>
    <td>
        <asp:TextBox ID="txtName" runat="server"></asp:TextBox>
     </td>
    </tr>
     <tr>
    <td>Phone Number: </td>
    <td>
        <asp:TextBox ID="txtPhone" runat="server"></asp:TextBox>
     </td>
    </tr>
     <tr>
    <td>Email Id: </td>
    <td>
        <asp:TextBox ID="txtEmail" runat="server"></asp:TextBox>
     </td>
    </tr>
     <tr>
    <td>Address: </td>
    <td>
        <asp:TextBox ID="txtAddress" runat="server"></asp:TextBox>
     </td>
    </tr>
    <tr>
    <td colspan="2">
        <asp:Button ID="btnSubmit" runat="server" Text="Submit" 
            onclick="btnSubmit_Click" OnClientClick="Javascript:validate()"/></td>
    </tr>  
    </table>
    </fieldset>
    </div>
    </form>
</body>
</html>

Upvotes: 1

Views: 1861

Answers (1)

Martin Parenteau
Martin Parenteau

Reputation: 73751

You must return the value of the validate function in OnClientClick:

OnClientClick="return validate();"

Upvotes: 4

Related Questions