Adding item generates 'get_simpleRendering' obj error.

[Chris]

I am adding items to the combobox using the examples given in the documentation and when I add an item I get an

JavaScript runtime error: Object doesn't support property or method 'get_simpleRendering'. I have tried various ways to do this to no avail. Any ideas as to why I am getting this error?

var combo = $find("<%= DayRadDropDownList.ClientID %>");
var i = 1;
for (i = 1; i <= mtype; i++) {
var comboItem = new Telerik.Web.UI.RadComboBoxItem();
comboItem.set_text("1");
comboItem.set_value("1");
combo.get_items().add(comboItem);
}

[Chris]

The line that is causing the problem is in the add. If I comment out this line it runs. I have tried different ways to write this to no avail. I did load a demo and it seems to work fine so I am thinking that it may be a conflict in how we have our site setup. Not sure.

[Shinu]

Hi Chris,

Please have a look into the sample code snippet which works fine at my end.

ASPX;

<telerik:RadComboBox ID="DayRadDropDownList" runat="server" OnClientLoad="AddItem">
</telerik:RadComboBox>

JavaScript:

<script type="text/javascript">
    function AddItem(sender, args) {
        var combo = $find("<%= DayRadDropDownList.ClientID %>");
        var mtype = 5;
        sender.trackChanges();
        for (i = 1; i <= mtype; i++) {
            var comboItem = new Telerik.Web.UI.RadComboBoxItem();
            comboItem.set_text(i.toString());
            comboItem.set_value("1");
            combo.get_items().add(comboItem);
        }
        sender.commitChanges();
    }
</script>

Let me know if you have any concern.
Thanks,
Shinu.

[Murali Karlapudi]

Replacethis line 

var comboItem = new Telerik.Web.UI.RadComboBoxItem();

with

  var comboItem = new Telerik.Web.UI.DropDownListItem();

*it worked for me

i followed  telerik documentaion  here http://www.telerik.com/help/aspnet-ajax/combobox-client-side-radcomboboxitemcollection.html  and got the same problem. while debugging the combo.get_items().  the type of the item is Telerik.Web.UI.DropDownListItem.

[Dimitar]

Hi all,

@Chris,

Shinu's approach, which is an example for the add() method in Murali's help article, works without errors on my side. You may give it a try and reply, if you have further questions.

@Murali,

The Telerik.Web.UI.DropDownListItem() constructor that you used was most probably needed, because you were using a RadDropDownList control, instead of RadComboBox. By implementing a RadComboBoxItem() constructor for RadDropDownList, you ran into an error when following the RadComboBox help article.

Regards,
Dimitar
Telerik