APArun Palaniyandi Syncfusion Team December 16, 2015 02:08 PM UTC
Thanks for contacting Syncfusion support.
Through HtmlAttributes property, we will add the attributes to wrapper of input element instead input element except the following attributes disabled, required and readOnly. So we suggest you to add the attributes to element directly by getting it from DropDownList object if it need.
The following JS Playground sample will show case the demo for the requirement.
APArun Palaniyandi Syncfusion Team December 17, 2015 12:57 PM UTC
Sorry for the inconvenience.
Currently, we don’t have the option for setting the html attributes on input itself so we are considering this as a usability feature. We have created an incident in your account kindly follow up the incident for further queries.