Client Picker Validation client side

Use the following function in onclient click .
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function IsEmptyPeoplePicker(pickerClientId) {
            var r = false;
            try {
  var txt = pickerClientId.text(); //Enter Name or Email Address...Rajesh Sivaprasadx             
    //If their is a selection in picker, always last character is 'x'.
                    //If last index of 'x' and total lenth is same,means picker has a resolved entity.
                 if (txt.lastIndexOf("x") != (txt.length - 1)) { return r = true; } 
               } catch (e) {return r = true; }
            return r;
        }
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It will return true if the picker empty.

Use a div with class me-error just below client picker in the same <td> to show validation message

eg: var isEmptyUserPicker = IsEmptyPeoplePicker($('#<%=userPicker.ClientID%>'));                
                    if (isEmptyUserPicker) {
                        $("#divUserPickerValidator").text("Please select Recommender");
                        $("#divUserPickerValidator").show();
                        $("#divUserPickerValidator").fadeOut(5000);
                        return r = false;
                    }