A workaround is to disable the embedded jQuery and use an older version (for example, 1.11.1 which is the previous version the suite used): https://docs.telerik.com/devtools/aspnet-ajax/controls/scriptmanager/disabling-the-embedded-jquery

Repro steps:

- add the dropdown
- write something

expected: you see the suggestions

actual: the suggestions go off the screen to the left



        <telerik:RadAutoCompleteBox ID="companyNameSelector" runat="server"
            EnableDirectionDetection="true" EnableScreenBoundaryDetection="true" DropDownWidth="400px"
            Width="200px">
        </telerik:RadAutoCompleteBox>



    protected void Page_Load(object sender, EventArgs e)
    {
        companyNameSelector.DataTextField = "someColumn";
        companyNameSelector.DataSource = GetDummyData();
        companyNameSelector.DataBind();
    }



    protected DataTable GetDummyData()
    {
        DataTable tbl = new DataTable();
        tbl.Columns.Add(new DataColumn("id", typeof(decimal)));
        tbl.Columns.Add(new DataColumn("Name", typeof(string)));
        tbl.Columns.Add(new DataColumn("moreData", typeof(decimal)));
        tbl.Columns.Add(new DataColumn("someColumn", typeof(string)));
        tbl.Rows.Add(new object[] { 1, "one", 2, "firstRecord4" });
        tbl.Rows.Add(new object[] { 2, "two", 3, "secondRecord4" });
        tbl.Rows.Add(new object[] { 3, "three", 4, "thirdRecord4" });
        tbl.Rows.Add(new object[] { 98, "four", 5, "fourthRecord4" });


        return tbl;
    }

Error message: "Unable to get property 'get_index' of undefined or null reference"

Video: https://www.screencast.com/t/SmoOmyopjOJg

Steps to reproduce:
1. Open http://demos.telerik.com/aspnet-ajax/autocompletebox/examples/default/defaultcs.aspx

2. Search for item in the Tone-enabled AutoCompleteBox

3. Choose an item from the result

4. Delete the token

5. Press Backspace

Result: A JS error is thrown:

"Unable to get property 'get_index' of undefined or null reference"

Instead of having the property to select single or multiple it would be more productive to have a property called SelectCount and we can enter the amount of listings to be selected. If its a single I select 1... for multiple I select how many I need. No more need for the Single/Multiple property except for backward compatibility.

RadAutoCompleteBox needs a Delay option to delay the retrieval of data while user is typing - in milliseconds.

Instead of the control expanding vertically to accomodate all entries, they should be positioned on a single line.