ASP.Net change radio button via javascript from onblur attribute

Posted on 2009-07-09
Last Modified: 2012-05-07
Please help. I have a radio button group with two buttons and one text box. If the user clicks into and then out of the text box I want to check if the user has changed the value from the default (which is 0) and if the user has changed the value I want the radio button to automatically switch to yes (which is the second item in the radio button group index).

I added the onblur attribute to my textbox and have tried to get the javascript going with all sorts of methods to no avail...

tbxBid.Attributes.Add("onblur", String.Format("CheckBoxChange(this.value,{0},{1});", tbxBox.ClientID, rdbGroup.ClientID))
    <script type="text/javascript">
        function CheckManualEntry(value, txtBoxName, rdbName) {
            var old_price = txtBoxName.getAttribute("value");
            var rb = document.getElementsByName(rdbName);
            rb[1].checked = true;

Open in new window

Question by:mrferrari
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
  • 2
  • 2
LVL 40

Expert Comment

by:Kyle Abrahams
ID: 24817957

set your autopostback to true.
add an ontextchanged event handler.
AJAX it.

Author Comment

ID: 24817975
I want to use javasciprt. this is really small and simple. i cant figure it out though.

I don't want the page to autopostback...
LVL 40

Expert Comment

by:Kyle Abrahams
ID: 24818103

tbxBid.Attributes.Add("onblur",   PASTE_FUNCTION_HERE)

What Is Transaction Monitoring and who needs it?

Synthetic Transaction Monitoring that you need for the day to day, which ensures your business website keeps running optimally, and that there is no downtime to impact your customer experience.

LVL 20

Expert Comment

ID: 24819717
I don't understand the scope beyond just the basics you outlined. I was a little confused by your attribute assignment in the code behind because you were calling on ID's that you hadn't mentioned in your question (tbxBid and tbxBox). All that is to say I may have missed the mark because I had to simplify without having more information...

Anyway this should give you an idea of how to begin managing the situation. I just wrote something that addresses the very specific things you mentioned. Of course I imagine you have a bigger scope and will have to update it accordingly...
LVL 20

Accepted Solution

ddayx10 earned 500 total points
ID: 24819725
didn't mean to post that (just hit the enter key on accident)...see snippet
****ASPX CODE****
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "">
<html xmlns="">
<head runat="server">
    <title>Change RadioButton</title>
    <script type="text/javascript">
		function CheckBoxChange(txtBx, rblID)
			if(txtBx.value != '0')
				var rblParent = document.getElementById(rblID);
				var rbl = rblParent.getElementsByTagName('input');
				rbl[0].checked = true;
    <form id="form1" runat="server">
		<span>Default Text Box</span>
		<asp:TextBox ID="tbxBid" runat="server" Text="0" />
		<asp:RadioButtonList ID="rdbGroup" runat="server">
			<asp:ListItem Value="0" Text="Yes" />
			<asp:ListItem Value="1" Text="No" />
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        If Not IsPostBack Then
            'Keep in mind that if you are using an asp:radiobuttonlist then the tdbGroup.clientID you are sending below
            'is actually a table, and you have to use that to get at the radiobuttons inside
            tbxBid.Attributes.Add("onblur", String.Format("CheckBoxChange(this,'{0}');", rdbGroup.ClientID))
        End If
    End Sub

Open in new window


Author Comment

ID: 24825248
bingo bango... that works great. thanks so much...

Featured Post

SharePoint Admin?

Enable Your Employees To Focus On The Core With Intuitive Onscreen Guidance That is With You At The Moment of Need.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Introduction HTML checkboxes provide the perfect way for a web developer to receive client input when the client's options might be none, one or many.  But the PHP code for processing the checkboxes can be confusing at first.  What if a checkbox is…
In Part 1 ( we covered the hexagonal maze basics -- how the cells are represented in a JavaScript array and how the maze is displayed.  In this part, we'…
The viewer will learn the basics of jQuery, including how to invoke it on a web page. Reference your jQuery libraries: (CODE) Include your new external js/jQuery file: (CODE) Write your first lines of code to setup your site for jQuery.: (CODE)
The viewer will learn the basics of jQuery including how to code hide show and toggles. Reference your jQuery libraries: (CODE) Include your new external js/jQuery file: (CODE) Write your first lines of code to setup your site for jQuery…

726 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question