Enabling control(radio button) through JavaScript

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<head runat="server">
    <title></title>
    <script type="text/javascript">
        function RadioClick() {
            alert("Hi");
            document.getElementById("FileUpload1").style.visibility = "visible";
        }
</script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <asp:RadioButton ID="rbClderFormt" runat="server" GroupName="Format"/>
    <asp:RadioButton ID="rdTableFormat" runat="server" GroupName="Format"/>
    <asp:RadioButton ID="rdUploadFormat" runat="server" GroupName="Format"/>

     <asp:FileUpload ID="FileUpload1" runat="server" Visible="false"/>
    </div>
    </form>
</body>

The above is the code. I have to change the visibility of "FileUpload1" When I click the rdUploadFormat radioButton. In the back end I m using the following code

C#

protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                rdUploadFormat.Attributes.Add("OnClick", "return RadioClick()");
            }
        }

The above is not working. I am getting the alert message but the FileUpload is not visible.

Posted 16-Oct-13 17:28pm

Prasaad SJ

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CodeBlack · Accepted Answer · 2013-10-16T18:29:00

remove Visible='false' and add style='display:none' to your file upload control as mentioned below :

ASP.NET

<asp:fileupload id="FileUpload1" runat="server" style="display: none" xmlns:asp="#unknown" />

and update javascript method as shown below :

C#

function RadioClick() {
        alert("Hi");
        document.getElementById("FileUpload1").style.display = "block";
    }