JavaScript - Radio button list

Asked By samantha jyesta
09-Dec-11 03:46 AM


Hi 

I have a Radio button list in my page . After placing that i have placed some other controls.
I need javascript for the radio button list while the user doesn't select any one option in radio button list , i need to show one alert messgae like please select any option in radio button list.


How can i do this.



Cheers,
Samantha.
  Vickey F replied to samantha jyesta
09-Dec-11 03:50 AM
Use this client side function-

function Check()
      {
     var RadioList= document.getElementById ('<%= boxid.ClientID %>');
       for(var i=0;i<RadioList.length;i++)
      {  
        if(RadioList[i].checked)
        {
       document.getElementById ('<%= boxid.ClientID %>').disabled=True;
       }
      }
      } 

This this code and let me know.
  dipa ahuja replied to samantha jyesta
09-Dec-11 03:51 AM
<script type="text/javascript">
 
  function checkSelection() {
    var listItemArray = document.getElementsByName('<%= RadioButtonList1.ClientID %>');
    
    var isItemChecked = false;
    
    //Radio check
    for (var i = 0; i < listItemArray.length; i++) {
      var listItem = listItemArray[i];
      if (listItem.checked) {
        isItemChecked = true;
      }
    }
         if (isItemChecked == false) {
      alert('Check atleast one item!');
      return false;
    }
    return true;
  
  }
</script>
 
<asp:RadioButtonList ID="RadioButtonList2" runat="server"
  AutoPostBack="True">
  <asp:ListItem>Yes</asp:ListItem>
  <asp:ListItem>No</asp:ListItem>
</asp:RadioButtonList>

  Suchit shah replied to samantha jyesta
09-Dec-11 04:17 AM
Suppose you have 3 Radiobuttons.. You will be validating on some button control. Please find below how to do it step by step.

Step1: Setup your radio buttons on aspx page.

<strong> Some Heading</strong>

 

<asp:RadioButtonID="Radio1"GroupName="Flag"runat="server"Text="DNR"/>&nbsp;

<asp:RadioButtonID="Radio2"GroupName="Flag"runat="server"Text="RE"/>&nbsp;

 

<asp:RadioButtonID="Radio3"GroupName="Flag"runat="server"Text="RI"/>

Step2: You have to declare some button/imagebutton or somthing else to validate. I suppose you have button cmdSave for validation.

Step3: in code behind of page On Page Load, you have to call javascript function of validation. i.e

cmdSave.Attributes.Add(

"onClick","Javascript:checkFlag()");

Step4: You have to declare function checkFlag() in your aspx page. i.e

function

checkFlag()

{

 

event.returnValue =false;

 

var DNR = document.getElementById('<%= RadioDNR.ClientID %>').checked;

 

var RE = document.getElementById('<%= RadioRE.ClientID %>').checked;

 

var RI = document.getElementById('<%= RadioRI.ClientID %>').checked;

 

if (DNR == false && RE == false && RI ==false)

{

alert (

'Please Specify one of the Flags');

}

 

else

{

 

event.returnValue =true;

}

}

You have to do nothing else. I am sure it will resolve your problem. If this is the solution of your problem, please mark this post as resolved. Thanks

  Anoop S replied to samantha jyesta
09-Dec-11 05:37 AM
try this


<script type="text/javascript">
<!--
function onButtonClick()
{
 return validateRadioButtonList('<%= RadioButtonList1.ClientID %>');
}
function validateRadioButtonList(radioButtonListId)
{
 var listItemArray = document.getElementsByName(radioButtonListId);
 var isItemChecked = false;

 for (var i=0; i<listItemArray.length; i++)
 {
  var listItem = listItemArray[i];

  if ( listItem.checked )
  {
   //alert(listItem.value);
   isItemChecked = true;
  }
 }

 if ( isItemChecked == false )
 {
  alert('Nothing is checked!');

  return false;
 }

 return true;
}
// -->
</script>

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