在验证后将焦点设置为文本框表单元素

I have a number of fields on a form that I perform Validation on, which I then want to Focus on if the validation fails. The Validation works fine, i.e. rtnStr, but the focus() just won't land on any of the textbox fields, i.e. vCtrl. It remains on the Submit button.I have a number of fields on a form that I perf