Sharepoint 2010:ECMA script to retrieve list data

Sharepoint 2010 has got new greate feature called "Client object Model" which is very useful.
Client object model helps developers in making things easier to develop client side applications in sharepoint 2010.
Using client object model we can do many of things with out writing server side code.
you will find enough of information on msdn about Client Object model and differerent platforms where it can be used,so iam will concentrating on ECMA script.
ECMA script:have you ever thought of using sharepoint objects in client(javascript) and updating the list items without having to write server code and with out having to deploy it as feature?
Yes its possible and here where ECMA script comes in to picture.
In this blog i am going to write about retrieving the list data using ECMA script.

Please find the code below to retrieve list data using ECMA script:
           <script type="text/javascript">
           ExecuteOrDelayUntilScriptLoaded(getList1Details, "sp.js");
           var clientContext= null;
           function getList1Details()
              {
                  var List1Items;       
                  clientContext= new SP.ClientContext.get_current();
                  var ListName = clientContext.get_web().get_lists().getByTitle('List1');
                  var camlQuery = new SP.CamlQuery();
                  camlQuery.set_viewXml("<Query><Where><IsNotNull><FieldRef Name='Title' /></IsNotNull></Where></Query>");
                  List1Items =ListName.getItems(camlQuery);
                  clientContext.load(List1Items);  
                  clientContext.executeQueryAsync(Function.createDelegate(this, this.onSuccessMethodItems), Function.createDelegate(this, this.onFailureMethodItems));
             }
          function onSuccessMethodItems(sender, args)
             {
                  var oListItemEnum=this.List1Items.getEnumerator();
                  while (oListItemEnum.moveNext()) //loop through items in list
                  {
                       var oListItem=oListItemEnum.get_current();
                       var strName=oListItem.get_item('EmpName'); //get 'EmpName' column value
                       alert('Employee Name:' + strName);
                  }
            }
         function onFailureMethodItems(sender, args)
           {  
                 alert('request failed for getting Items' + args.get_message() + '\n' + args.get_stackTrace());             
           }
  </script>


so above code returns the data from a list called 'List1'.
you can further customize code as per your requirement.