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Trying to disable button if text hasn’t being input and one of three check box hasn’t been checked in JavaScript

I am trying to disable a button that requires both an input of text being typed and one of three checkboxes being checked. The text is a user name and the checkbox is a difficulty of either easy, medium, or hard. Currently, my function only works if one of the requirements is met. So if the text has been inputted the button is enabled and the same with the checkboxes.
startButton.addEventListener('click', startQuiz);
function disableButton() {
if (document.getElementById("username").value === "") {
document.getElementById("start-btn").disabled = true;
}
if (document.getElementsByName("difficulty").checked) {
document.getElementById("start-btn").disabled = true;
}
else {
document.getElementById("start-btn").disabled = false;
}
}
<div>
<label for="username">Enter your Username</label>
<input type="text" name="username" id="username" onkeyup="disableButton()" placeholder="Enter Username">
</div>
<div id="difficulty" class="center">
<div>
<input type="radio" name="difficulty" id="easy-diff" onclick="disableButton()">
<label for="easy-diff">Easy</label>
</div>
<div>
<input type="radio" name="difficulty" id="medium-diff" onclick="disableButton()">
<label for="medium-diff">Medium</label>
</div>
<div>
<input type="radio" name="difficulty" id="hard-diff" onclick="disableButton()">
<label for="hard-diff">Hard</label>
</div>
</div>
<button id="start-btn" type="submit" class="btn" disabled>Start</button>

every time the value changed, check both input
let diffChecked = false;
let startButton = document.querySelector('#start-btn');
let username = document.querySelector('#username');
let difficulty = document.querySelectorAll('[name="difficulty"]');
username.addEventListener('input', function() {
validateInput();
})
difficulty.forEach(function(item) {
item.addEventListener('click', function() {
diffChecked = true;
validateInput();
})
})
function validateInput() {
if (username.value && diffChecked) {
startButton.disabled = false;
} else {
startButton.disabled = true
}
}
<div>
<label for="username">Enter your Username</label>
<input type="text" name="username" id="username" placeholder="Enter Username">
</div>
<div id="difficulty" class="center">
<div>
<input type="radio" name="difficulty" id="easy-diff">
<label for="easy-diff">Easy</label>
</div>
<div>
<input type="radio" name="difficulty" id="medium-diff">
<label for="medium-diff">Medium</label>
</div>
<div>
<input type="radio" name="difficulty" id="hard-diff">
<label for="hard-diff">Hard</label>
</div>
</div>
<button id="start-btn" type="submit" class="btn" disabled>Start</button>

Instead of a div you must use the Semantic HTML form, that will do the job for you without even writing javascript code.
<form id="difficulty" class="center">
<div>
<input type="radio" name="difficulty" id="easy-diff" required>
<label for="easy-diff">Easy</label>
</div>
<div>
<input type="radio" name="difficulty" id="medium-diff" required>
<label for="medium-diff">Medium</label>
</div>
<div>
<input type="radio" name="difficulty" id="hard-diff" required>
<label for="hard-diff">Hard</label>
</div>
<button type="submit">Enviar</button>
</form>
Inside a form tag, the submit button only works with all required inputs does not have an undefined value.
And you may call your function startQuiz as an action, if you want.
The action attribute specifies where to send the form-data when a form is submitted.
<form id="difficulty" class="center" action="startQuiz()">

Fix button to stay disable until user checks a checkbox as well

<form action="add.php" method="post" onsubmit="return ValidationEvent()">
<input type="email" placeholder="Email" class="js-email" name="email" value="<?=formDisplay(getSessionValue("er_email"))?>" required>
<input type="text" placeholder="Zip Code" class="js-zip" name="zip" value="<?=formDisplay(getSessionValue("er_zip"))?>" required>
<input type="text" placeholder="First Name" class="js-name" name="firstname" value="<?=formDisplay(getSessionValue("er_first"))?>" required>
<input type="text" placeholder="Last Name" class="js-lname" name="lastname" value="<?=formDisplay(getSessionValue("er_last"))?>" required>
<input type="password" id="password" placeholder="Password" class="js-pass" name="password" required>
<input type="password" id="confirm" placeholder="Confirm Password" class="js-pass" name="confirm" required>
<span class="textLeft flex alignCenter terms">
<input type="checkbox" name="terms" value="yes" required>
<span>
<span>I agree</span>
</span>
</span>
<span class="textLeft flex alignCenter terms">
<input type="checkbox" name="term" value="yes">
<span>
<span>Keep me posted</span>
</span>
</span>
<center>
<input class="disabled white cbtn1 c1" type="submit" id="submit-btn" value="START MY ORDER" disabled>
</center>
<?php
unset($_SESSION['er_email']);
unset($_SESSION['er_zip']);
unset($_SESSION['er_first']);
unset($_SESSION['er_last']);
?>
</form>
Javascript:
(function() {
$('form > input').keyup(function() {
var empty = false;
$('form > input').each(function() {
if ($(this).val() == '') {
empty = true;
}
});
if (empty) {
$('#submit-btn').attr('disabled', 'disabled').addClass('disabled').removeClass('orangeBtn');
} else {
$('#submit-btn').removeAttr('disabled').removeClass('disabled').addClass('orangeBtn');;
}
});
})()
As you can see from the image, the button gets enabled once you enter all the input fields, I tried with my javascript above for it to also be display until I check "I agree", even if the "keep me posted" was unchecked, but for some reason the it gets enabled before the user clicks "I agree" , how can I fix this?

if empty or checkbox not checked keep it disabled.
if (empty || !$('input[name="terms"]').is(':checked')) {
$('#submit-btn').attr('disabled', 'disabled').addClass('disabled').removeClass('orangeBtn');
} else {
$('#submit-btn').removeAttr('disabled').removeClass('disabled').addClass('orangeBtn');;
}
You are checking if inputs have values. the checkbox has a value "Yes" so it validates as true.

this is because you have skipped if checkbox is checked or not, so you have to add that check too:
var checkbox = $('form > input[type=checkbox]:checked').length;
$('form > input').each(function() {
if ($(this).val() == '' && checkbox == 0 ) {
empty = true;
}
});

This is simple example of how to enable and disable a button.
This might help you implement your logic.
$("#testCheckBox").click(function(){
if(this.checked) {
$("#testBtn").removeAttr("disabled");
} else {
$("#testBtn").prop("disabled", true);
}
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.0/jquery.min.js"></script>
<input type="checkbox" id="testCheckBox">
<button id="testBtn" disabled="true">Click It</button>

Prepending only if the div isn't showing?

Basically, I want to prepend a div only if the div I'm prepending isn't already showing.
$(".loginForm").submit(function() {
var username = $("input.username").val();
var password = $("input.password").val();
var errorvisible = $("body").has(".alert.error");
if (!username || !password && errorvisible == false) {
$('body').prepend("<div class=\"error alert\">One or more field(s), have been left empty</div>");
setTimeout(function() {
$('.error.alert').fadeOut('1000', function() {
$('.error.alert').remove();
});
}, 6000);
event.preventDefault();
}
});
At the moment, I'm trying to make it so the jquery will only do the if empty if statement if the error isn't currently visible however it's not working...
<div class="pageCont">
<div class="title">
<h1>LetsChat</h1>
<h4>The new way of interaction.</h4>
</div>
<div class="login box">
<form method="POST" action="#" class="loginForm">
<input type="text" class="loginInput username" placeholder="Aquinas Email or Number" /><br>
<input type="password" class="loginInput password" placeholder="Password" /><br>
<div class="checkBox">
<input type="checkbox" id="checkBoxLink">
<label for="checkBoxLink">Remember Me</label>
Forgotten your password?
</div>
<input type="submit" value="Submit" class="login btn green" />
<input type="reset" value="Clear Fields" class="reset btn green" />
</form>
</div>
<div class="signup box">
<form method="POST" action="#" class="signupForm">
<input type="text" class="signupInput" placeholder="First Name" /><br>
<input type="text" class="signupInput" placeholder="Last Name" /><br>
<input type="text" class="signupInput" placeholder="Aquinas Email" /><br>
<input type="password" class="signupInput" placeholder="Password" /><br>
<input type="submit" class="purple btn signup" value="Sign Up Today!">
</form>
</div>
</div>

The below should work if I'm understanding your question correctly?
$(".loginForm").submit(function() {
var username = $("input.username").val();
var password = $("input.password").val();
var errorvisible = $("body").has(".alert.error").length;
if (!username || !password)
{
if(errorvisible == 0)
$('body').prepend("<div class=\"error alert\">One or more field(s), have been left empty</div>");
setTimeout(function() {
$('.error.alert').fadeOut('1000', function() {
$('.error.alert').remove();
});
}, 6000);
event.preventDefault();
}
});

I have used this type of code many times:
if(!$('#myFancyDiv').is(':visible')) {
//prepend or do whatever you want here
}
BTW just for clarity, this code checks if 'myFancyDiv' is not visible.

You can check whether the .error.alert elements exists, if so don't do anything else create a new one
$(".loginForm").submit(function() {
var username = $("input.username").val();
var password = $("input.password").val();
var errorvisible = $("body").has(".alert.error");
if (!username || !password && errorvisible == false) {
if (!$('.error.alert').length) {
$('body').prepend("<div class=\"error alert\">One or more field(s), have been left empty</div>");
setTimeout(function() {
$('.error.alert').fadeOut('1000', function() {
$(this).remove();
});
}, 6000);
}
event.preventDefault();
}
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<form method="POST" action="#" class="loginForm">
<input type="text" class="loginInput username" placeholder="Aquinas Email or Number" />
<br>
<input type="password" class="loginInput password" placeholder="Password" />
<br>
<div class="checkBox">
<input type="checkbox" id="checkBoxLink">
<label for="checkBoxLink">Remember Me</label>
Forgotten your password?
</div>
<input type="submit" value="Submit" class="login btn green" />
<input type="reset" value="Clear Fields" class="reset btn green" />
</form>

Selector is not working in jquery

Hi I've HTML code which is
<div id="testing"></div>
<input type="text" name="amount[]" id="amount_1" value="800">
<input type="text" name="date[]" id="date_1" value="12/05/2015">
<input type="text" name="notes[]" id="notes_1" value="This is test notes">
<hr />
<hr />
<hr />
<hr />
<input type="text" name="amount[]" id="amount_2" value="1500">
<input type="text" name="date[]" id="date_2" value="12/10/2015">
<input type="text" name="notes[]" id="notes_2" value="Towing amount paid Order ID 000000001">
<hr />
<hr />
<hr />
<hr />
<input type="text" name="amount[]" id="amount_3" value="1600">
<input type="text" name="date[]" id="date_3" value="12/09/2015">
<input type="text" name="notes[]" id="notes_3" value="Towing amount paid Order ID 000000002">
Now I want to search a value in my notes fields which is Towing amount paid Order ID 000000001 and I want to empty these fields and my javascript/jquery code is
$(document).ready(function() {
if($("input[name^=notes]").val().indexOf("Towing amount paid Order ID ") > -1) {
$("#testing").text('found it');
/*var current = $("input[name^=notes]");
var onePrevious = $(current).prev();
var twoPrevious = $(current).prev().prev();
current.attr('value', '');
onePrevious.attr('value', '');
twoPrevious.attr('value', '');*/
} else {
$("#testing").text('not found');
}
});
But this code is giving me not found message what is wrong in my code I've tried different selectors but didn't work for me.

You can use jQuery :contains pseudo it will find the first element that contains the required text
Ref: https://api.jquery.com/contains-selector/
Code:
if($("input[name^='notes']:contains('Towing amount paid Order ID ')")) {
$("#testing").text('found it');
} else {
$("#testing").text('not found');
}
Demo: http://jsfiddle.net/La1bq789/

This code searches only in the input which has value - This is test notes.
To look in all fields use $.each:
$(document).ready(function () {
$("input[name^='notes']").each(function () {
if ($(this).val().indexOf("Towing amount paid Order ID ") > -1) {
$("#testing").text('found it');
} else {
$("#testing").text('not found');
}
});
});
JSFiddle - http://jsfiddle.net/FakeHeal/362o548n/
Edit for clearing the fields: http://jsfiddle.net/FakeHeal/362o548n/1/

The main problem is that you checking only one element value and you need to check all elements.
I did make some changes with your code, now it's working:
$("input[name^=notes]").each(function(){
if($(this).val().indexOf("Towing amount paid Order ID ") > -1) {
$("#testing").text('found it');
/*var current = $("input[name^=notes]");
var onePrevious = $(current).prev();
var twoPrevious = $(current).prev().prev();
current.attr('value', '');
onePrevious.attr('value', '');
twoPrevious.attr('value', '');*/
} else {
$("#testing").text('not found');
}
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
<div id="testing"></div>
<input type="text" name="amount[]" id="amount_1" value="800">
<input type="text" name="date[]" id="date_1" value="12/05/2015">
<input type="text" name="notes[]" id="notes_1" value="This is test notes">
<hr />
<hr />
<hr />
<hr />
<input type="text" name="amount[]" id="amount_2" value="1500">
<input type="text" name="date[]" id="date_2" value="12/10/2015">
<input type="text" name="notes[]" id="notes_2" value="Towing amount paid Order ID 000000001">
<hr />
<hr />
<hr />
<hr />
<input type="text" name="amount[]" id="amount_3" value="1600">
<input type="text" name="date[]" id="date_3" value="12/09/2015">
<input type="text" name="notes[]" id="notes_3" value="Towing amount paid Order ID 000000002">

$(document).ready(function() {
$("input").each(function() {
if ($(this).val().indexOf("Towing amount paid Order ID ") > -1) {
$("#testing").text('found it');
/*var current = $("input[name^=notes]");
var onePrevious = $(current).prev();
var twoPrevious = $(current).prev().prev();
current.attr('value', '');
onePrevious.attr('value', '');
twoPrevious.attr('value', '');*/
}
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.10.0/jquery.min.js"></script>
<div id="testing"></div>
<input type="text" name="amount[]" id="amount_1" value="800">
<input type="text" name="date[]" id="date_1" value="12/05/2015">
<input type="text" name="notes[]" id="notes_1" value="This is test notes">
<hr />
<hr />
<hr />
<hr />
<input type="text" name="amount[]" id="amount_2" value="1500">
<input type="text" name="date[]" id="date_2" value="12/10/2015">
<input type="text" name="notes[]" id="notes_2" value="Towing amount paid Order ID 000000001">
<hr />
<hr />
<hr />
<hr />
<input type="text" name="amount[]" id="amount_3" value="1600">
<input type="text" name="date[]" id="date_3" value="12/09/2015">
<input type="text" name="notes[]" id="notes_3" value="Towing amount paid Order ID 000000002">

$("input[name^=notes]").val() will only ever return the value of the first element in the page than matches that selector.
In order to check all of them you need to look at each instance
I would suggest you modularize the repeating groups by wrapping each group in a container to help locate other related elements within each group
<div class="input-group">
<input type="text" name="amount[]" id="amount_1" value="800">
<input type="text" name="date[]" id="date_1" value="12/05/2015">
<input type="text" name="notes[]" id="notes_1" value="This is test notes">
</div>
Then loop over the inputs you want to focus on
var hasNotes = $("input[name^=notes]").filter(function(){
return this.value.indexOf("Towing amount paid Order ID ") > -1
}).length;
var message = hasNotes ? 'found it' :'not found'
$('#testing.text(message);
If you need to make adjustments to other values, use an each lopp and traverse within the container

How to shift values from one div panel to other in jquery?

In a Form, there are multiple div Panels
<form>
<div class="panel1">
<input type="text" value="" name="bank0" id="bank0">
<input type="text" value="" name="shank0" id="shank0">
<input type="text" value="" name="dhank0" id="dhank0">
<input type="text" value="" name="raank0" id="raank0">
</div>
<hr>
<div class="panel2">
<input type="text" value="" name="bank1" id="bank1">
<input type="text" value="" name="shank1" id="shank1">
<input type="text" value="" name="dhank1" id="dhank1">
<input type="text" value="" name="raank1" id="raank1">
</div>
</form>
Requirement:
If user left panel1 blank and entered text to panel 2;
then we want to shift all values from panel 2 to panel 1; during final submission of form.
In real use case we have 10 such panels.
Fiddle: https://jsfiddle.net/rop5f0d6/

Try this.
var inputsValue = [];
$("button").click(function () {
$(".panel2 input").each(function () {
inputsValue.push(this.value);
});
$(".panel1 input").each(function (i, value) {
$(this).val(inputsValue[i]);
});
inputsValue = [];
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<div class="panel1">
<input type="text" value="" name="bank0" id="bank0">
<input type="text" value="" name="shank0" id="shank0">
<input type="text" value="" name="dhank0" id="dhank0">
<input type="text" value="" name="raank0" id="raank0">
</div>
<hr>
<div class="panel2">
<input type="text" value="" name="bank1" id="bank1">
<input type="text" value="" name="shank1" id="shank1">
<input type="text" value="" name="dhank1" id="dhank1">
<input type="text" value="" name="raank1" id="raank1">
</div>
<hr>
<button>Submit</button>

This will only move the data from panel 2 to panel 1 if the first panel is left blank (what I read from the requirements).
Also it wipes panel 2 data to prevent duplicate form data being posted. From your question I think this is what you are aiming for?
Here is how you can implement this functionality in jQuery:
$("button").click(function(){
var moveData = true, formvalues = [];
$(".panel1 input").each(function(e, field){
if( field.value != '' ){
moveData = false;
return false;
}
});
// only move data if first panel is blank
if( moveData ){
$(".panel2 input").each(function(){
formvalues.push( this.value );
this.value = '';
});
$(".panel1 input").each(function (i) {
this.value = formvalues[i];
});
}
});
<script src="https://code.jquery.com/jquery-2.1.4.min.js"></script>
<div class="panel1">
<input type="text" value="" name="bank0" id="bank0">
<input type="text" value="" name="shank0" id="shank0">
<input type="text" value="" name="dhank0" id="dhank0">
<input type="text" value="" name="raank0" id="raank0">
</div>
<hr>
<div class="panel2">
<input type="text" value="" name="bank1" id="bank1">
<input type="text" value="" name="shank1" id="shank1">
<input type="text" value="" name="dhank1" id="dhank1">
<input type="text" value="" name="raank1" id="raank1">
</div>
<hr>
<button>Submit</button>
I've also written the solution in vanilla JS for your reference (possibly useful) as plain JS is more efficient in performance.
var submitBtn = document.getElementsByTagName("button")[0];
submitBtn.addEventListener("click", function(){
var moveData = true,
formvalues = [],
panel1 = document.getElementsByClassName("panel1"),
panel1Fields = panel1[0].getElementsByTagName("input"),
panel2 = document.getElementsByClassName("panel2"),
panel2Fields = panel2[0].getElementsByTagName("input");
for(var i=0; i < panel1Fields.length; i++){
if( panel1Fields[i].value != '' ){
moveData = false;
return false;
}
}
// only move data if first panel is blank
if( moveData ){
for(var i=0; i < panel2Fields.length; i++){
formvalues.push( panel2Fields[i].value );
panel2Fields[i].value = '';
}
for(var i=0; i < panel1Fields.length; i++){
panel1Fields[i].value = formvalues[i];
}
}
});
<div class="panel1">
<input type="text" value="" name="bank0" id="bank0">
<input type="text" value="" name="shank0" id="shank0">
<input type="text" value="" name="dhank0" id="dhank0">
<input type="text" value="" name="raank0" id="raank0">
</div>
<div class="panel2">
<input type="text" value="" name="bank1" id="bank1">
<input type="text" value="" name="shank1" id="shank1">
<input type="text" value="" name="dhank1" id="dhank1">
<input type="text" value="" name="raank1" id="raank1">
</div>
<button>Send</button>