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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()">

Enable submit button only when all fields are not empty - type > file & select & input

<script src="https://code.jquery.com/jquery-1.12.4.js" integrity="sha256-Qw82+bXyGq6MydymqBxNPYTaUXXq7c8v3CwiYwLLNXU=" crossorigin="anonymous"></script>
<script type="text/javascript">
required = function(fields) {
var valid = true;
fields.each(function () { // iterate all
var $this = $(this);
if (($this.is(':checkbox') && !$this.is(":checked")) || // checkbox
(($this.is(':text') || $this.is('textarea')) && !$this.val()) || // text and textarea
($this.is(':radio') && !$('input[name='+ $this.attr("name") +']:checked').length)) { // radio
valid = false;
}
});
return valid;
}
validateRealTime = function () {
var fields = $("form :input:not(:hidden)"); // select required
fields.on('keyup change keypress blur', function () {
if (required(fields)) {
{submit.disabled = false} // action if all valid
} else {
{submit.disabled = true} // action if not valid
}
});
}
validateRealTime();
</script>
<form action="" method="post" id="submitform" />
Title:
<input type="text" name="title">
Select:
<select>
<option value="">aaa</option>
<option value="1">bbb</option>
<option value="2">ccc</option>
</select>
<br/>
<label for="myfile">Select a file:</label>
<input type="file" id="myfile" name="myfile">
<br>
Description:
<textarea name="description"></textarea>
<br/>
Category:
<ul class="list:category categorychecklist form-no-clear" id="categorychecklist">
<li id="category-19"><label class="selectit"><input type="radio" id="in-category-19" name="category" value="19"> Animation</label></li>
<li id="category-20"><label class="selectit"><input type="radio" id="in-category-20" name="category" value="20"> Anime</label></li>
</ul>
<input type="submit" value="Submit Topic" class="button-primary" name="submit" id="submit" disabled="disabled" />
</form>
Hi i want to enable the submit button only when all field are filled specially the select input and the file input here's a working code for the other type except the select and the file type
The code below is doing this
When the text field is empty the submit should be disabled
(disabled="disabled").
When something is typed in the text field to remove the disabled
attribute.
If the text field becomes empty again(the text is deleted) the
submit button should be disabled again.
My aim is to enable submit button only once everything has been filled. How do I do this?
Any ideas? how can i disable the submit button when user is not choosing a file or an option in the form
<form action="" method="post" id="submitform" /> Title:
<input type="text" name="title"> Select:
<select>
<option value="">aaa</option>
<option value="1">bbb</option>
<option value="2">ccc</option>
</select>
<br/>
<label for="myfile">Select a file:</label>
<input type="file" id="myfile" name="myfile">
<br> Description:
<textarea name="description"></textarea>
<br/> Category:
<ul class="list:category categorychecklist form-no-clear" id="categorychecklist">
<li id="category-19"><label class="selectit"><input type="radio" id="in-category-19" name="category" value="19"> Animation</label></li>
<li id="category-20"><label class="selectit"><input type="radio" id="in-category-20" name="category" value="20"> Anime</label></li>
</ul>
<input type="submit" value="Submit Topic" class="button-primary" name="submit" id="submit" disabled="disabled" />
</form>

You closed your form tag
You cannot name or ID anything in a form "submit" - it will stop any future submission by script so get used to not doing it
You COULD just add the required attribute to the fields, then the form would give error when submitted
Here is how to disable in not both text field and textarea have content
$(function() {
$("#submitform").on("input",function() {
const anythingEmpty = $(":input").val().trim() === "";
$("#subBut").prop("disabled",anythingEmpty);
})
})
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<form action="" method="post" id="submitform"> Title:
<input type="text" name="title"> Select:
<select>
<option value="">aaa</option>
<option value="1">bbb</option>
<option value="2">ccc</option>
</select>
<br/>
<label for="myfile">Select a file:</label>
<input type="file" id="myfile" name="myfile">
<br> Description:
<textarea name="description"></textarea>
<br/> Category:
<ul class="list:category categorychecklist form-no-clear" id="categorychecklist">
<li id="category-19"><label class="selectit"><input type="radio" id="in-category-19" name="category" value="19"> Animation</label></li>
<li id="category-20"><label class="selectit"><input type="radio" id="in-category-20" name="category" value="20"> Anime</label></li>
</ul>
<input type="submit" id="subBut" value="Submit Topic" class="button-primary" disabled="disabled" />
</form>
Plain JS
window.addEventListener("load",function() {
document.getElementById("submitform").addEventListener("input",function() {
const desEmpty = this.querySelector("[name=description]").value.trim() === "";
const txtEmpty = this.querySelector("[name=title]").value.trim() === "";
document.getElementById("subBut").disabled = desEmpty || txtEmpty
})
})

If u add id on every input, u can use next js vanilla code, and add onchange function on form.
<head>
<script>
function validate(){
var submit = document.getElementById('submit');
var title = document.getElementById('title').value === ""? false: true;
var file = document.getElementById("myfile").value === ""? false: true;
var val19 = document.getElementById("in-category-19").checked;
var val20 = document.getElementById("in-category-20").checked;
var checked = val19 || val20;
var textArea = document.getElementById("textarea").value===""?false: true;
var filled =(checked && title&& textArea && file);
filled? submit.disabled=false: submit.disabled=true;
}
</script>
</head>
<body><form onchange="validate();" action="" method="post" id="submitform" /> Title:
<input type="text" id="title" name="title"> Select:
<select>
<option value="">aaa</option>
<option value="1">bbb</option>
<option value="2">ccc</option>
</select>
<br/>
<label for="myfile">Select a file:</label>
<input type="file" id="myfile" name="myfile">
<br> Description:
<textarea id ="textarea" name="description"></textarea>
<br/> Category:
<ul class="list:category categorychecklist form-no-clear" id="categorychecklist">
<li id="category-19"><label class="selectit"><input type="radio" id="in-category-19" name="category" value="19"> Animation</label></li>
<li id="category-20"><label class="selectit"><input type="radio" id="in-category-20" name="category" value="20"> Anime</label></li>
</ul>
<input type="submit" value="Submit Topic" class="button-primary" name="submit" id="submit" disabled=true />
</form>
</body>

How can I set the value in a textbox on form load?

This is what I tried for setting the textbox values but it doesn't seem to be working. I want the textboxes to have the values in them when the page loads. the function is within the script tag.
function setMSRP()
{
var MSRP = "$29,120.00";
var destinationCharge = "$875.00";
var rebate = "-$10,000.00";
var taxes = "6%"
var titlesAndFees = "$209.00";
document.getElementById("txtMSRP").value = MSRP;
document.getElementById("txtDestinationCharge").value = destinationCharge;
document.getElementById("txtRebates").value = rebate;
document.getElementById("txtTaxes").value = taxes;
document.getElementById("txtElectricTitleAndFees").value = titlesAndFees;
}
</script>
</head>
<body onload="setMSRP()">
<form>
<h1>Calculate Focus Price</h1>
<hr/>
<label for="txtMSRP">MSRP:</label>
<input autofocus id="txtMSRP" type="text" readonly="readonly"/>
<br/>
<label for="txtDestinationCharge">Destination Charge:</label>
<input type="text" id="txtDestinationCharge" readonly="readonly"/>
<br/>
<label for="txtRebates">Rebates:</label>
<input type="text" id="txtRebates" readonly="readonly"/>
<br/>
<label for="txtTaxes">Taxes:</label>
<input type="text" id="txtTaxes" readonly="readonly"/>
<br/>
<label for="txtElectricTitleAndFees">Electric Title and Fees:</label>
<input type="text" id="txtElectricTitleAndFees" readonly="readonly"/>
<br/>
<input type="button" id="btnCalculateTotal" onclick="calcTotal()"
</form>
</body>

You have some syntax errors in code. Look at the modified example below:
<html>
<head>
<script>
function setMSRP() {
var MSRP = "$29,120.00";
var destinationCharge = "$875.00";
var rebate = "-$10,000.00";
var taxes = "6%"
var titlesAndFees = "$209.00";
document.getElementById("txtMSRP").value = MSRP;
document.getElementById("txtDestinationCharge").value = destinationCharge;
document.getElementById("txtRebates").value = rebate;
document.getElementById("txtTaxes").value = taxes;
document.getElementById("txtElectricTitleAndFees").value = titlesAndFees;
}
</script>
</head>
<body onload="setMSRP()">
<form>
<h1>Calculate Focus Price</h1>
<hr/>
<label for="txtMSRP">MSRP:</label>
<input autofocus id="txtMSRP" type="text" readonly="readonly" />
<br/>
<label for="txtDestinationCharge">Destination Charge:</label>
<input type="text" id="txtDestinationCharge" readonly="readonly" />
<br/>
<label for="txtRebates">Rebates:</label>
<input type="text" id="txtRebates" readonly="readonly" />
<br/>
<label for="txtTaxes">Taxes:</label>
<input type="text" id="txtTaxes" readonly="readonly" />
<br/>
<label for="txtElectricTitleAndFees">Electric Title and Fees:</label>
<input type="text" id="txtElectricTitleAndFees" readonly="readonly" />
<br/>
<input type="button" id="btnCalculateTotal" onclick="calcTotal()">
</form>
</body>
</html>
I want the textboxes to have the values in them when the page loads.
You don't need JS for this:
<input id="txtMSRP" type="text" value="<your_value>" />

If you wanted placeholders inside the input[type=text], simply use
var textbox = document.querySelector("#textbox");
textbox.setAttribute("placeholder", "This is the Placeholder");
Or use the HTML Attribute to set the value/placeholder:
<input type="text" id="textbox" value="Hello" placeholder="Introductory Statement" />

Get dynamic Class Names

For testing I have the alert, so the problem seem to be before the alert.
it throws errors at:
var firstPrevClass= "categClass"+PrevClass;
var newCategory = document.getElementsByClassName(firstPrevClass);
Uncaught TypeError: undefined is not a function
Basically in function addCategory I want to create dynamically new divs with different class names (which is creating dynamically).
After that I want to append the new category after the last category.
In function addField I want to put a new field at the category which selected from the selection box.
In function getClass I get the selected className so I can create a new field in the selected div.
How to do it?
/*add new category to SelextBox*/
function addCategory() {
var categoryValue = document.getElementById("newCateg").value;
var y = document.getElementById('selectCategory');
var option = document.createElement("option");
var hid = document.getElementById("nextValue").value;
var newClass = "categClass" + hid;
option.setAttribute("class", newClass);
option.value = categoryValue;
option.text = categoryValue;
y.add(option);
var PrevClass = hid-1 ;/*i do this to get the first previous class*/
var firstPrevClass= "categClass"+PrevClass;
alert(newClass);
var newCategory = document.getElementsByClassName(firstPrevClass);
var div = document.createElement('div');
div.setAttribute('class',newClass );
var a = document.createElement('a');
a.setAttribute('class', 'titles');
var input_checkC = document.createElement('input');
input_checkC.setAttribute('type', 'checkbox');
input_checkC.setAttribute('class', 'check');
var textNodeCateg = document.createTextNode(categoryValue);
div.appendChild(a);
div.appendChild(input_checkC);
div.appendChild(textNodeCateg);
var last = newCategory.length;
newCategory[last].appendChild(div);
document.getElementById("nextValue").value++;
alert(newClass);
}
function getClass(sel) {
var x =sel.options[sel.selectedIndex].className;
document.getElementById("submitSelection").value=x;
}
function addField() {
var val = document.getElementById("submitSelection").value;
var existedCategory = document.getElementsByClassName(val);
var fieldValue = document.getElementById("newField").value;
var div = document.createElement('div');
var input_check = document.createElement('input');
input_check.setAttribute('type', 'checkbox');
input_check.setAttribute('class', 'check');
var input = document.createElement('input');
input.setAttribute('type', 'text');
var br = document.createElement('br');
var textnode = document.createTextNode(fieldValue);
div.appendChild(input_check);
div.appendChild(textnode);
div.appendChild(input);
div.appendChild(br);
existedCategory.appendChild(div);
}
<ul>
<li>Προσθέστε το όνομα της νέας κατηγορίας</li>
<p>Ονομα Kατηγορίας:
<label>
<input type="text" id="newCateg" />
</label>
<input type="button" id="addCateg" value="Προσθήκη" onclick=" addCategory()" />
</p>
<p> </p>
<li>Επιλέξετε κατω απο ποια κατηγορία θα ανήκει το νεο πεδίο και εισάγεται το όνομα του νέου πεδίου.</li>
<p>Κατηγορία:</p>
<input type="hidden" value="4" id="nextValue" />
<input type="hidden" value="" id="submitSelection" />
<select id="selectCategory" onchange="getClass(this)">
<option>Επιλογή ...</option>
<option class="categClass1">Εξοδα Κατοικίας</option>
<option class="categClass2">Εξοδα Εκπαίδευσης</option>
<option class="categClass3">Εξοδα Ψηχαγωγίας</option>
</select>
<p>Ονομα πεδίου:
<label>
<input type="text" id="newField" />
<input type="button" value="Προσθήκη" onclick="addField()" />
<br />
</label>
</p>
<div class="class_1">
<p class="titles">
<input type="checkbox" class="catChk1 check" onchange="checkAll(subCheck1,subChks)" />Εξοδα Kατοικιας</p>
<div class="field">
<input type="checkbox" class="subCheck1 check" />Ενοίκιο
<input type="text" />
</br>
</div>
<div class="field">
<input type="checkbox" class="subCheck1 check" />Θέρμανση
<input type="text" />
</br>
</div>
<div class="field">
<input type="checkbox" class="subCheck1 check" />Διάφορα Yλικά
<input type="text" />
</br>
</div>
<div class="class_2">
<p class="titles">
<input type="checkbox" class="check" onchange="checkAll(this)" />Εξοδα Εκπαίδευσης παιδιού</p>
<div class="field">
<input type="checkbox" class="check" />Φροντιστήρια
<input type="text" />
</br>
</div>
<div class="field">
<input type="checkbox" class="check" />Βιβλία
<input type="text" />
</br>
</div>
<div class="field">
<input type="checkbox" class="check" />Σχολική Υλη
<input type="text" />
</br>
</div>
<div class="class_3">
<p class="titles">
<input type="checkbox" class="check chk" onchange="checkAll(this)" />Για Ψυχαγωγία</p>
<div class="field">
<input type="checkbox" class="check" />
<label>Θέατρο</label>
<input type="text" />
</br>
</div>
<div class="field">
<input type="checkbox" class="check" />
<label>Ψάρεμα</label>
<input type="text" />
</br>
</div>
<div class="field">
<input type="checkbox" class="check" />
<label>Γήπεδο</label>
<input type="text" />
</br>
</div>

Combo box for all control

I created a filterable drop Down List using JavaScript. This is the List Box Coding.
<select name="d1" class="leftselect" id="d1" size="5" ondblclick="DropDownTextToBox('d1','t1');" style="display:none;" >
<option>axcsus-COMMON STOCK</option>
<option>aces</option>
<option>bdfs</option>
<option>befs</option>
<option>behs</option>
<option>dfgh</option>
<option>dhes</option>
<option>dwww</option>
<option>pass</option>
<option>pass</option>
</select>
I created 4 Text Field and a arrow character. If i click the arrow character , I'll show the list at the bottom of the control.
<div id="div_name" style="float:left;z-index: 20;">
<input name="t1" type="text" id="t1" onkeyup="value_filtering('d1','t1');" onkeypress="onEnter(event,'d1','t1')" />
<input type="button" class="rightselect" onclick="displayList('d1','t1');" value="▼" />
</div>
<div class="inputbox">
<input name="t2" class="inputbox" type="text" id="t2" onkeyup="value_filtering('d2','t2');" onkeypress="onEnter(event,'d2','t2')" />
<input type="button" class="leftselect" onclick="displayList('d1','t2');" value="▼" />
</div>
<div style="float:left;text-align:center;" >
<input name="t3" type="text" id="t3" onkeyup="value_filtering('d3','t3');" onkeypress="onEnter(event,'d3','t3')" />
<input type="button" class="rightselect" onclick="displayList('d1','t3');" value="▼" />
</div>
<div class="inputbox">
<input name="t4" class="inputbox" type="text" id="t4" onkeyup="value_filtering('d4','t4');" onkeypress="onEnter(event,'d4','t4')" />
<input type="button" class="leftselect" onclick="displayList('d1','t4');" value="▼" />
</div>
In the display List function I'm getting the corresponded textbox position and displayed the List Control under the Text Box. Okie. Now my problem is If i select any option in the text box, I need to display the selected value to the textbox which the listbox shown under. After selecting the value from the list box, How i find in which text box showing the List ? Dynamically how can i find the text box id ?
This is my JS code for displaying the Listbox to the corresponding TextBox.
function displayList(ele,txt)
{
vis=document.getElementById(ele);
obj=document.getElementById(txt);
if (vis.style.display==="none")
vis.style.display="block";
else
vis.style.display="none";
vis.style.position = "absolute";
//alert(getElementPosition(txt).top + ' ' + getElementPosition(txt).left);
vis.style.top = getElementPosition(txt).top+obj.offsetHeight;
vis.style.left = getElementPosition(txt).left;
}
Note : I can call this function at the click event of arrow button. I can easily pass the text Field Id. But in the case ListBox action i can't send the particular ID of the Text Field.

If you have no opposition to using jquery you can using the jquery UI built-in autocomplete which will do pretty much what you're looking for. For more advanced and nicer plugins you can try chosen

Try this.
<script>
var targetInput=null;
function displayList(ele,txt) {
vis=document.getElementById(ele);
obj=document.getElementById(txt);
targetInput = obj;
if (vis.style.display==="none") {
vis.style.display = "block";
} else {
vis.style.display = "none";
vis.style.position = "absolute";
//alert(getElementPosition(txt).top + ' ' + getElementPosition(txt).left);
vis.style.top = getElementPosition(txt).top+obj.offsetHeight;
vis.style.left = getElementPosition(txt).left;
}
}
function selectList(txt) {
if (!targetInput) return;
targetInput.value = txt.value;
txt.style.display = 'none';
}
</script>
<div id="div_name" style="float:left;z-index: 20;">
<input name="t1" type="text" id="t1" onkeyup="value_filtering('d1','t1');" onkeypress="onEnter(event,'d1','t1')" />
<input type="button" class="rightselect" onclick="displayList('d1','t1');" value="▼" />
</div>
<div class="inputbox">
<input name="t2" class="inputbox" type="text" id="t2" onkeyup="value_filtering('d2','t2');" onkeypress="onEnter(event,'d2','t2')" />
<input type="button" class="leftselect" onclick="displayList('d1','t2');" value="▼" />
</div>
<div style="float:left;text-align:center;" >
<input name="t3" type="text" id="t3" onkeyup="value_filtering('d3','t3');" onkeypress="onEnter(event,'d3','t3')" />
<input type="button" class="rightselect" onclick="displayList('d1','t3');" value="▼" />
</div>
<div class="inputbox">
<input name="t4" class="inputbox" type="text" id="t4" onkeyup="value_filtering('d4','t4');" onkeypress="onEnter(event,'d4','t4')" />
<input type="button" class="leftselect" onclick="displayList('d1','t4');" value="▼" />
</div>
<select name="d1" class="leftselect" id="d1" size="5" ondblclick="DropDownTextToBox('d1','t1');" onclick="selectList(this)" style="display:none;">
<option>axcsus-COMMON STOCK</option>
<option>aces</option>
<option>bdfs</option>
<option>befs</option>
<option>behs</option>
<option>dfgh</option>
<option>dhes</option>
<option>dwww</option>
<option>pass</option>
<option>pass</option>
</select>