调用Java脚本返回值到asp.net中的代码页

Question

i want to call my java script function return value to my code
i have a function like this..(this i wrote in my java script)

function GetSex()
{

    var sex = EIDAWebComponent.GetSex();
    if(sex == 'M')
        return "Male";
    if(sex == 'F')
        return "Female";
    if(sex == 'X')
        return "Unknown";
}

my code:

<td>
    <span>Sex:&nbsp;</span>
</td>
<td>
    <span id="Sex_PDLabel" runat=server></span>
</td>

how i can call this return value in my code? i want to get corresponding value to any variable. so try to write code something like this:

 ScriptManager.RegisterStartupScript(DirectCast(HttpContext.Current.Handler, Page), GetType(Page), "GetSEx", "GetSex()", True)
 Dim SexVAl = Sex_PDLabel.InnerText

but my sexVal Always getting empty string.i dont know why? what is the problem with my code?

any help is very appriciable..

Answer 1

Use this.

aspx: Create a hidden field to store the value.

<input type="hidden" id="txtHidden" runat="server" />

javascript code:

function GetSex()
{
    var sex = EIDAWebComponent.GetSex();
     alert(sex);
    if(sex == 'M')
        document.getElementById("txtHidden").value=  "Male";
    else if(sex == 'F')
        document.getElementById("txtHidden").value =  "Female";
    else if(sex == 'X')
        document.getElementById("txtHidden").value =  "Unknown";
    else
        document.getElementById("txtHidden").value =  "none";
}

Call from ASP.NET code:

ScriptManager.RegisterStartupScript((Page)(HttpContext.Current.Handler), 
                  typeof(Page), "GetSex", "GetSex();", true);

String value = txtHidden.Value;

Answer 2

One of the approaches is to store the value in a hidden field .

Add following to your ASP.NET markup:

<asp:HiddenField id="hdnField" runat="server" />

and call:

document.getElementById('<%= hdnField.ClientID %>').value = GetSex();

In codebehind the value will be accessible as:

var val = hdnField.Value;