Jquery Validation OnBlur of textbox

Jquery Validation OnBlur of textbox

The HTML code-sample

<div class="form-group error">
    <label for="inputEmail3" class="col-sm-4 control-label">Order Number * </label>
    <div class="col-sm-8">
        <input type="text" class="form-control" id="txtOrderNumber" placeholder="OrderNumber">
        <span class="help-block">Required.</span>

The jQuery/JavaScript code-sample

$(function () {
    //Validation for Update devices input.
    $("#txtFormGroup input").blur(function () {

var validateDevice = function () {
    if ($(this).val() == "") {


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