Use JavaScript in ASP.Net

Question

I know JavaScript and asp.net but this is first time I am using JavaScript in asp.net . I face a little problem.

My problem is JS function isvaliduser() return true or false,all time 'cObj.Save(courseObj)' is called ! I need when JS function return true only that time cObj.Save(courseObj) will call otherwise cObj.Save(courseObj) will not call.

This is my code :

 CGateway cObj = new CGateway ();
 protected void saveButton_Click(object sender, EventArgs e)
 {
     CInfo cInfoObj = new CInfo();
     cInfoObj.AName= ANameTextBox.Text;

     cObj.Save(courseObj);
 }

JavaScript :

function isvaliduser()
{
    var uid;
    var temp = document.getElementById("<%=ANameTextBox.ClientID %>");
    uid = temp.value;
    if(uid == "")
    {
       alert ("Please Enter UserName”);
       return false;
    }
    else
    {
        return true;
    }
}

ASPX:

<asp:Button ID="saveButton" runat="server" Text="Save"
OnClientClick ="javascript:isvaliduser()" />

How can I do it? Thank you.

Answer 1

You need the OnClientClick to return true or false (which if true will submit the button and if false will not). Something like this should work:

<asp:Button ID="saveButton" 
    runat="server" 
    Text="Save" 
    OnClientClick="return isvaliduser();" />