How to validate the radiobutton in asp in JavaScript File?

Question

I have two radio button both are unchecked. When I select a button, it will alert select one radiobutton..
After selection of the radiobutton that radio button should be unchecked....

Comments

Not able to understand can you update the issue step by step so that someone can look into it?

Answer 1

function selectRadioButton()
{

var y=document.getElementById("ctl00_ContentPlaceHolder1_rbyes");
var n=document.getElementById("ctl00_ContentPlaceHolder1_rbno");


if(y.checked==false && n.checked==false)
{
alert(Please select Yes/No");
return false;
}
return true;
}

<asp:RadioButton  runat="server" ID="rbyes" Text="Yes"  visible="true" GroupName="a"  />
 <asp:RadioButton  runat="server" ID="rbno" Text="No" visible="true" GroupName="a" />
 <asp:Button  ID="btnOk" runat="server" Text="OK" OnClick="btnOk_Click"  OnClientClick="return selectRadioButton();"/>