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JavaScript - detect input change on any input/select field on current modal

I have a modal with ~20 input and select fields that the user is supposed to complete. I would like to a quick JavaScript check whether the field is empty or not after the user is navigating away / changing / etc. the field, but want to avoid having to copy paste the code below 20 times and personalize it for each field.
<!-- Holidex -->
<label>Holidex:</label>
<div class="input-group">
<span class="input-group-addon"><i class="fa fa-bars"></i></span>
<input type="text" class="form-control" maxlength="5" placeholder="What is your Holidex code?" id="addHolidex" name="addHolidex" style="text-transform:uppercase" />
</div>
<!-- /.Holidex -->
<script type="text/javascript">
$('#addHolidex').on('keyup keydown keypress change paste', function() {
if ($(this).val() == '') {
$('#addHolidex').removeClass('has-success').addClass('has-warning');
} else {
$('#addHolidex').addClass('has-success').removeClass('has-warning');
}
});
</script>
Is there any way to have the code above check for any select / input field on my NewUserModal?
Thank you!
EDIT
So I fiddled around with the suggested codes below but only the following managed to halfway work:
$('.input-group').on('keyup keydown keypress change paste', function() {
if ($(this).val() == '') {
$(this).removeClass('has-success').addClass('has-error');
} else {
$(this).addClass('has-success').removeClass('has-error');
}
});
Empty fields are being flagged correctly now, but fields with content do not have the has-success class added. Note that I have to apply this class to the <div class="input-group"> element instead of the input select fields.
Any suggestions? I am running on bootstrap 3 if that helps.
EDIT 2
Still no result and quite frankly have had enough for today.
- select fields are either ignored or incorrectly flagged with has-error if pre-populated
- individual input fields seem to work more or less
- grouped input fields nestled in one div all turn red if one field is empty (eg. phone number + phone country both turn red of there is not country code entered)
// highlight empty fields in red
$('.input-group input, select').on('keyup keydown keypress change paste',function(){
if ($(this).val() == '') {
$(this).parent().closest('.input-group').removeClass('has-success').addClass('has-error');
} else {
$(this).parent().closest('.input-group').removeClass('has-error').addClass('has-success');
}
});
I basically would have to redo the whole design of my modal and I quite frankly dont want to go down that road. Not a fan of JS/ Jquery today.

Not really sure this is what you're looking for but, why do not simply make your code more universal:
$('input').on('keyup keydown keypress change paste', function() {
if ($(this).val() == '') {
$(this).removeClass('has-success').addClass('has-warning');
} else {
$(this).addClass('has-success').removeClass('has-warning');
}
});
EDIT
If you would like to specify a precise form, add an ID to your form :
<form id="myForm">
<label>Holidex:</label>
<div class="input-group">
<span class="input-group-addon"><i class="fa fa-bars"></i></span>
<input type="text" class="form-control" maxlength="5" placeholder="What is your Holidex code?" id="addHolidex" name="addHolidex" style="text-transform:uppercase" />
</div>
</form>
$('#myForm input').on('keyup keydown keypress change paste', function() {
if ($(this).val() == '') {
$(this).removeClass('has-success').addClass('has-warning');
} else {
$(this).addClass('has-success').removeClass('has-warning');
}
});

Add a new class to the input
<input type="text" class="form-control Input-to-verify" maxlength="5" placeholder="What is your Holidex code?" id="addHolidex" name="addHolidex" style="text-transform:uppercase" />
and then in javascript:
$('.Input-to-verify').on('change',function(){
if ($(this).val() == '') {
$(this).removeClass('has-success').addClass('has-warning');
} else {
$(this).addClass('has-success').removeClass('has-warning');
}
});
I hope this works

Adding exceptions in blur event

I'm making a simple Multiple Choice Question form. I want to put validation that if a user clicks on Question <textarea> and clicks somewhere else on page while not entering value in <input type="text" name="q1_option1"> of options of the question, then the user should get an alert("Wait, you forgot to enter options for Question 1");. I tried doing it like this but it's simply not the thing that i want. Here is the <html>
<div class="right">
<div class="row" style="margin:5px;">
<label><strong>Question 1</strong></label>
<div>
<textarea name="question1"></textarea>
</div>
</div>
<div class="row">
<div class="span-4"><input type="text" name="q1_option1" value="" class="q1" /></div>
<div class="span-4"><input type="text" name="q1_option2" value="" class="q1" /></div>
<div class="span-4"><input type="text" name="q1_option3" value="" class="q1" /></div>
<div class="span-4"><input type="text" name="q1_option4" value="" class="q1" /></div>
<div class="clear"></div>
</div>
</div>
And this is <script>
<script type="text/javascript">
$(function(){
$('textarea[name=question1]').blur(function(){
$('.right').click(function(event) {
if($(event.target).is('input[name=q1_option1]')) {
$('#alert_error_message').text('Please enter all options in Question 1!!');
callalert();
return false;
}
else
{
alert('Not working!');
}
})
})
})
</script>
Now what is happening in this code, when the user clicks on <input> to enter the options, blur is fired and user gets the alert.
What i want that if a user clicks on these <input> of answers, he should not get the alert, else, the user must get the alert for not entering values in the <input> of options!!

DEMO
I came up with below approach and I will explain what I am doing with the below code. Check for the inline comments.
$(function(){
var hasFocus=false; //this variable is used to check whether focus was on textarea
//when clicked on document
$('textarea[name=question1]').blur(function(event){
setTimeout(function(){
hasFocus=false; //on blur set the variable to false but after sometime
},100);
}).focus(function(){
hasFocus=true; //on focus set it to true again
});
//A click event on document so that to display alert only if textarea had focus and the
//targetted element is not radio button
$(document).on('click',function(e){
if($(e.target).attr('class')!='q1' && hasFocus && $(e.target).attr('name')!="question1")
{
if(!$('.q1:checked').length) //if any radio has been checked
{
//if not checked then display alert
alert('Please select an option');
}
}
});
})

How about this?
var all_filled = true;
// for each component having class "q1", if the value is empty, then all_filled is false
$('.q1').each(function(comp){
if(comp.val() == ''){
all_filled = false;
break;
}
});
// if not all input is filled, then do what you want
if(!all_filled){
// do what you want
}

Auto tab to next input field when fill 4 characters

What I am trying to do is, point to next tab when filling four characters. Each field should have 4 characters and once it is completed it should move to next input box.
$(".inputs").keyup(function () {
if (this.value.length == this.maxLength) {
$(this).next('.inputs').focus();
}
});
Fiddle.

Your code works fine, however your input elements are set as type="number". Non-numeric content is ignored, so if you enter "abcd", for example, the input's value is empty (meaning a length of 0). If you enter "1234" on the other hand, the input's value is 1234.
If you want your code to fire when non-numeric content is entered, simply change each input's type to text.
<input class="inputs" type="text" maxlength="4" />
JSFiddle demo.
Note that I've also removed the duplicate class attribute from each of your elements in that example, too.
As krish has mentioned in the comments on your question, there is an issue with your code in that the last input element will continue to accept more than 4 characters. To fix this, put a check in place to ensure that there is a next('.inputs') element:
if (this.value.length == this.maxLength) {
var $next = $(this).next('.inputs');
if ($next.length)
$(this).next('.inputs').focus();
else
$(this).blur();
}
JSFiddle demo.

Perhaps you neglected to enclose your code in DOM ready. Jsfiddle encloses your code in $(window).load(function() { .....}) and that's why it's working. So on your own page use:
$(function() {
$(".inputs").keyup(function () {
if (this.value.length == this.maxLength) {
$(this).next('.inputs').focus();
}
});
});
In the jsfiddle you can confirm that by selecting No wrap - in <head> and then click run. The code will not work. But if you use the above which is enclosed in DOM ready, it works.

<html>
<head>
<script src="http://code.jquery.com/jquery-1.11.0.min.js"></script>
<Script>
$(document).ready(function(){
$(".inputs").keyup(function () {
$this=$(this);
if ($this.val().length >=$this.data("maxlength")) {
if($this.val().length>$this.data("maxlength")){
$this.val($this.val().substring(0,4));
}
$this.next(".inputs").focus();
}
});
});
</Script>
</head>
<body>
<input type="text" class="inputs" data-maxlength="4">
<input type="text" class="inputs" data-maxlength="4">
<input type="text" class="inputs" data-maxlength="4">
<input type="text" class="inputs" data-maxlength="4">
</body>

Here is a improved Version for all who need this for some kind of splitted Informations like a serial key or something like that:
$(document).ready(function(){
$(".amazonInput").keydown(function (e) {
var code = e.which;
$this=$(this);
if ($this.val().length >=$this.data("maxlength") && code != 8) {
if($this.val().length>$this.data("maxlength")){
$this.val($this.val().substring(0,4));
}
$this.next(".amazonInput").focus();
}
if($this.val().length == 0 && code == 8) {
$this.prev(".amazonInput").focus();
}
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

My first issue with this has been that if tabbing through fields that are already filled, you have to select each field manually. I suggest this:
$(".inputs").keyup(function () {
if (this.value.length == this.maxLength) {
$(this).next('.inputs').select();
}
});
The second issue's solution escapes me. Basically, in the same situation of having fields previously filled, if you type too quickly the events will fire as such: KeyDown KeyDown KeyUp KeyUp
What this causes, is to skip the next input.

For those Who Have tried the Accepted Answer, but Couldn't find solution like me
In your Layout Page or page header, just input ajax library link (Shown in below)
It worked on me, Hope It will help you as well.
$(".inputs").keyup(function () {
if (this.value.length == this.maxLength) {
var $next = $(this).next('.inputs');
if ($next.length)
$(this).next('.inputs').focus();
else
$(this).blur();
}
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<body>
<input class="inputs" type="text" maxlength="4" style="font-size:10px" />
<input class="inputs" type="text" maxlength="4" style="font-size:10px" />
<input class="inputs" type="text" maxlength="4" style="font-size:10px" />
</body>

remove parent div if the input value is empty and show parent div if the input value is not empty?

I am trying to remove parent div if the input value is empty and show parent div if the input value is not empty?
the value of the input field is dynamic which means the value of it is the value of another input filed and I do this using javascript.
so far I haven't been able to show/hide the parent div for some reason. and I suspect the reason is because the value of the input field is dynamic which means the users are not typing anything in that input field. they are typing in another input filed and the value of the dynamic input field gets updated accordingly.
Here is what i have so far for show/hide the parent div:
HTML:
<div id="BOTTEXT2" class="secTxt">
<input type="text" class="sect2" id="sect2" style="border:none; background:none; " value="" size="12" readonly="readonly"/>
</div>
JAVASCRIPT:
<script type="text/javascript">
if(document.getElementById("sect2").value == ""){
document.getElementById("BOTTEXT2").style.display="block";
}
</script>
could someone please help me out with this?

Wrap your code in an event handler:
window.onload = function() {
var input = document.getElementById('sect2');
input.addEventListener('change', function() {
document.getElementById('BOTTEXT2').style.display = (input.value ? 'block' : 'none');
}, false);
};
This way, whenever you update the input, the div state changes accordingly.

I don't know if it will work for you, but follow the solution.
I created another input type out of main div to simulate the situation.
I used jQuery. After that, you can set your css of your way.
HTML
<div id="BOTTEXT2" class="secTxt">
<input type="text" class="sect2" id="sect2" style="border:none; background:none; " value="BSAU145D" size="12" readonly="readonly"/>
</div>
<input type="text" id="sect1">
Javascript (jQuery)
$(document).ready(function(){
$('#sect1').keyup(function(){
if($('#sect1').val() == 'test') {
$('#BOTTEXT2').css({'display':'none'});
} else {
$('#BOTTEXT2').css({'display':'block'});
}
});
});
Here is the fiddle

Form login button enabled after password field has focus

hello guys I have a login page with two inputs username and password and one button. I want to put a class on that button after password field has first character filled in. How can I do that , Thank's. If is possible to do that only with css will be awesome, or a small script to add a class on that button.
<form>
Username <input type="text" name="first" id="first" /><br/><br/>
Password <input type="text" name="last" id="last" />
<br/>
</form>
<input class="crbl" type="submit" name="last" id="last" value="login button" />
css
/*Normal State*/
.crbl{
margin-top:10px;
border:1px solid #555555;
border-radius:5px;
}
/*after password field has one character filled in state*/
.class{
???
}
fiddle:
http://jsfiddle.net/uGudk/16/

You can use toggleClass and keyup methods.
// caching the object for avoiding unnecessary DOM traversing.
var $login = $('.crbl');
$('#last').keyup(function(){
$login.toggleClass('className', this.value.length > 0);
});
http://jsfiddle.net/5eYN5/
Note that IDs must be unique.

You can do that using javascript. FIrst thing you need to put on password input the following event
Password <input type="text" name="last" id="last" onkeyup="myFunction(this);"/>
Then you define the javascript function:
function myFunction(element) {
if (element.value != '') {
document.getElementById('last').attr('class','password-1');
} else {
document.getElementById('last').attr('class','password-0');
}
}

You may try like this demo
jQuery(document).ready(function(){
jQuery('#last').keyup(function(event){
var password_length =jQuery("#last").val().length;
if(password_length >= 1){
jQuery("#last_button").addClass('someclass');
}
else
{
jQuery("#last_button").removeClass('someclass');
}
});
});

This is the best way to handle the entire input, with the "on()" Jquery method.
Use the very first parent
<form id="former">
Username <input type="text" name="first" id="first" /><br/><br/>
Password <input type="text" name="last" id="last" />
<br/>
</form>
<input class="crbl" type="submit" name="last" id="last_btn" value="login button" />
Then in Jquery
$("#former").on('keydown, keyup, keypress','#last',function(e){
var value = $(this).val();
if ( value.length > 0 ) {
$("#last_btn").addClass('class'):
}else{
$("#last_btn").removeClass('class');
}
});
With "on" method you can handle many event of the input as you can see...

make sure your ID is unique.. since you have two IDs with the same name in fiddle.. i changed the password id to 'password'...
use keyup() to check the key pressed.. and addClass() to add the class..
try this
$('#password').keyup(function(){
if($(this).val()==''){
$('#last').removeClass('newclassname'); //if empty remove the class
}else{
$('#last').addClass('newclassname'); // not not empty add
}
});
fiddle here

<script type="text/javascript">
$('#YourTextBoxId').keyup(function (e) {
if ($(this).val().length == 1) {
$(this).toggleClass("YourNewClassName");
}
else if ($(this).val().length == 0) {
$(this).toggleClass("YourOldClassName");
}
})
</script>

Test this:
http://jsfiddle.net/uGudk/33/
Please consider using unique id for all form elements, and use unique input name also.
$(document).ready(function(){
$("input[name=last]").keydown(function () {
if($(this).val().length > 0){
$(this).attr("class", "class");
//or change the submit button
$("input[type=submit]").attr("class", "class");
//or if you want to enable it if originally disbaled
$("input[type=submit]").removeAttr("disabled");
}
});
});