or

html, body{ position: relative;}function ClientValidate_<%= this.ClientID %>(source, args) { var combo = $find("<%= ExComboControl.ClientID %>"); if (combo.get_enabled()) { args.IsValid = false; var text = combo.get_text(); if (text.length < 1) { args.IsValid = false; combo.set_emptyMessage("Please choose an Item"); } else { combo.trackChanges(); console.log(text); var node = combo.findItemByText(text); console.log(node); var inputElement = combo.get_inputDomElement(); console.log(inputElement); if (node) { args.IsValid = true args.IsValid = false; inputElement.style.color = "black"; } else { args.IsValid = false; inputElement.style.color = "#FF0000"; } } } }