Question

I have a hidden variable in my aspx page as below.

  <input type="hidden" value="" runat="server" id="homeExcelData" filename=""/>

On click of a button, iam doing a a form.Sumbit();

Before submitting, i am setting the properties of the hidden control as below.

document.getElementById("homeExcelData").attributes["filename"] = "test.xls";
                            $("#homeExcelData").attr("filename","test.xls");
                            $("#homeExcelData").prop("filename","test.xls");
                            alert($("#homeExcelData").attr("filename"));
                            $("#homeExcelData").val(excelData);

In the code behind, during postback, i can get the excelData by homeExcelData.Value which i set in the javascript.

But the value of the attribute “filename” is coming as empty string(not as null) instead of “test.xls”.

Please help me to fix it.

Server side code:

 string fileName = homeExcelData.Attributes["filename"] ?? "report.xls";

Answer 1

The above works for me. I think what is happening is that on postback of your submit button the value is somehow getting re initialized (Your javascript for adding attributes is loading twice-moving it to server side works for me)

protected void Page_Load(object sender, EventArgs e)
{
    if (!Page.IsPostBack)
    {
        // Set attribute on page Load
        homeExcelData.Attributes.Add("filename","test.xls");
    }
}

protected void btnCheckValues_Click(object sender, EventArgs e)
{
    Response.Write( homeExcelData.Attributes["filename"].ToString());

}