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How to check if one or more checkbox in form is selected (only when div is displayed)

I need help to validate a form on submit. It should check that one of more checkboxes are selected or else display error message. I have currently got it working but the problem is the checkbox option is displayed after selecting a radio button on the form.
The code I have now still shows an error message even if the div isn't displayed which is a big issue as users haven't seen the checkbox option.
I want the checkbox error message to show ONLY if the user has selected the radio button "NO" and therefor is required to check a checkbox. If they select the radio button "YES" and this checkbox div is not displayed, then I don't want the error message on submit.
function hide() {
document.getElementById('hidden').style.display ='none';
}
function show() {
document.getElementById('hidden').style.display = 'block';
}
function validateForm() {
var checked = false;
var elements = document.getElementsByName("tick");
for (var i = 0; i < elements.length; i++) {
if (elements[i].checked) {
checked = true;
}
}
if (!checked) {
alert('You must select why you are attending!');
}
return checked;
}
<form id="form" method="post" enctype="text/plain" name="vform">
<p>This course is identified in my Work Plan and Learning Agreement</p>
<input type="radio" name="optionOne" value="yes" onclick="hide()" required> Yes<br>
<input type="radio" id="chk" name="optionOne" value="no" onclick="show()"> No<br>
<p>
<div id="hidden" style="display: none">
<p>I am attending this session because (tick all that apply) </p>
<input type="checkbox" name="tick" value="selectone"> It will help me develop the skills and knowledge required for my current role<br>
<input type="checkbox" name="tick" value="selecttwo"> It will help me develop the skills and knowledge for a possible future role/body of work <br>
<input type="checkbox" name="tick" value="selectthree"> It was identified as a need during my performance management discussions<br>
<input type="checkbox" name="tick" value="selectfour"> My manager recommended that I attend<br>
<input type="checkbox" name="tick" value="selectfive"> I am interested in the content<br>
<p>
<p>What would you like to achieve as a result of your attendance? For example, "I would like to learn to write better emails to improve my communication skills." </p>
<input type="text" id="results" name="results">
</div>
<div class="submit-button">
<button type="submit" name="submit" onclick="validateForm()" value="send">Submit</button>
</div>
</form>

try (select "No" below)
function validateForm(e) {
let inp=[...document.getElementsByName("tick")];
if(!inp.some(i=>i.checked) && chk.checked) {
e.preventDefault();
alert('You must select why you are attending!');
}
}
function validateForm(e) {
let inp=[...document.getElementsByName("tick")];
if(!inp.some(i=>i.checked) && chk.checked) {
e.preventDefault();
alert('You must select why you are attending!');
}
}
// DISPLAY HIDDEN TEXT
function hide() {
document.getElementById('hidden').style.display ='none';
}
function show() {
document.getElementById('hidden').style.display = 'block';
}
<form id="form" method="post" enctype="text/plain" name="form">
<p>This course is identified in my Work Plan and Learning Agreement</p>
<input type="radio" name="optionOne" value="yes" onclick="hide()" required> Yes<br>
<input type="radio" id="chk" name="optionOne" value="no" onclick="show()"> No<br>
<p>
<div id="hidden" style="display: none">
<p>I am attending this session because (tick all that apply) </p>
<input type="checkbox" name="tick" value="selectone"> It will help me develop the skills and knowledge required for my current role<br>
<input type="checkbox" name="tick" value="selecttwo"> It will help me develop the skills and knowledge for a possible future role/body of work <br>
<input type="checkbox" name="tick" value="selectthree"> It was identified as a need during my performance management discussions<br>
<input type="checkbox" name="tick" value="selectfour"> My manager recommended that I attend<br>
<input type="checkbox" name="tick" value="selectfive"> I am interested in the content<br>
<p>
<p>What would you like to achieve as a result of your attendance? For example, "I would like to learn to write better emails to improve my communication skills." </p>
<input type="text" id="results" name="results">
</div>
<div class="submit-button">
<button type="submit" onclick="validateForm(event)" name="submit" value="send">Submit</button>
</div>
</form>

Here's the old school way. Just check the display attribute of the div, and only set your flag to false inside that.
function validateForm() {
var checked;
if(document.getElementById("hidden").style.display == "block") {
checked = false;
var elements = document.getElementsByName("tick");
for (var i=0; i < elements.length; i++) {
if (elements[i].checked) {
checked = true;
}
}
}
if (checked===false) {
alert('You must select why you are attending!');
}
return checked;
}

Choosing among radio buttons and Text Field

I have 2 radio buttons. All of them have different values. I also have one text field, in case I need a different value, I can enter that value on that text field.
<form action="" onsubmit="return doSubmit(this)">
<input type="radio" name="url" value="https://example.com/fee/25"> $25
<input type="radio" name="url" value="https://example.com/fee/50"> $50
<input type="submit" value="Submit">
</form>
and here is the Javascript I've found to make radio buttons working
<script type="text/javascript">
function doSubmit(form) {
var urls = form['url'];
var i = urls && urls.length;
while (i--) {
if (urls[i].checked) {
window.location = urls[i].value;
}
}
document.getElementById("amount").value;
return false;
}
</script>
I have one text field:
<input type="text" name="amount" size="10" id="amount" value="">
Ok. If the amount is entered, then I need to use this code:
document.getElementById("amount").value
But how to make it working with radio buttons? I have created this JS code:
<script type="text/javascript">
var link = "https://example.com/fee/";
var input= document.getElementById('amount');
input.onchange=input.onkeyup= function() {
link.search= encodeURIComponent(input.value);
};
</script>
What I'm doing wrong? Thanks in advance for your time. I love and enjoy learning from experts.

I would create a separate radio button for the text input:
var options = Array.from(document.querySelectorAll("[name=url]"));
amount.addEventListener('focus', function() {
options[0].checked = true; // If textbox gets focus, check that radio button
});
options[0].addEventListener('change', function() {
amount.focus(); // if first radio button gets checked, focus on textbox.
});
function doSubmit(form) {
// get checked value, replace empty value with input text
var value = options.find( option => option.checked ).value || amount.value;
window.location = "https://example.com/fee/" + value;
return false;
};
<form action="" onsubmit="return doSubmit(this)">
<input type="radio" name="url" value="" checked>
$<input type="text" name="amount" size="5" id="amount" value="" >
<input type="radio" name="url" value="25"> $25
<input type="radio" name="url" value="50"> $50
<input type="submit" value="Submit">
</form>

Instead of using the url as the value for the radio buttons, consider using the value you wish to pass to the url:
function doSubmit(form) {
var endpoint = "https://example.com/fee/";
// gets the values of input elements that were selected
var checkedValues = Array.from(form.amounts)
.filter(radio => radio.checked)
.map(radio => radio.value);
// if a radio button was checked, use its value
// otherwise, use the value in the text field
var amount = checkedValues.length ?
checkedValues[0] : form.amount.value;
console.log('redirecting to: ', endpoint + amount);
return false;
}
// uncheck radio buttons when text is entered
function uncheck() {
Array.from(document.querySelectorAll('input[name="amounts"]'))
.forEach(radio => radio.checked = false);
}
<form action="" onsubmit="return doSubmit(this)">
<input type="radio" name="amounts" value="25"> $25
<input type="radio" name="amounts" value="50"> $50
<input type="text" name="amount" onkeyup="uncheck()">
<input type="submit" value="Submit">
</form>
Edit: Wow I completely forgot you could use the :checked attribute as a css selector. In this case, the code becomes quite simple:
function doSubmit(form) {
// select checked inputs with the specified name attribute
var checkedRadio = document.querySelector('input[name="amounts"]:checked')
// if we have a radio button that is checked, use its value
// otherwise, use the text input's value
var amount = checkedRadio ? checkedRadio.value : form.amount.value;
window.location = 'https://example.com/fee/' + amount;
return false;
}
// uncheck radio buttons when text is entered
function uncheck() {
Array.from(document.querySelectorAll('input[name="amounts"]'))
.forEach(radio => radio.checked = false);
}
<form action="" onsubmit="return doSubmit(this)">
<input type="radio" name="amounts" value="25"> $25
<input type="radio" name="amounts" value="50"> $50
<input type="text" name="amount" onkeyup="uncheck()">
<input type="submit" value="Submit">
</form>

Revealing & Switching Between Hidden HTML Forms

I've read through a lot of tickets like this question but can't seem to get what I want to work. So I've had to ask this one.
I have 2 forms on a HTML page and 2 buttons.
Both forms are hidden using inline styling: style="display:none;"
What I want to do is reveal form 1 with button 1 and hide form 2, and button 2 to hide form 1 and show form 2.
Here is button 1:
<button type="button" id="button7">Click Here If your Serial Number is 549999 or Below</button>
Here is button 2:
<button type="button" id="button8">Click Here If your Serial Number is 550000 or Above</button>
This is form 1:
<form name="lowsearch" id="lowsearch" method="post" action="action.html" target="formresponse" style="display:none;">
<input TYPE="hidden" NAME="command" VALUE="search">
<input TYPE="hidden" NAME="file" VALUE="Repair_Project/R&S2Web.db">
<input TYPE="hidden" NAME="database" VALUE="Old_Serial">
<input TYPE="hidden" NAME="searchfields" VALUE="S_Serial_No;S_Description">
<p><b>Please enter your Serial Number</b></p>
<input TYPE="text" size="10" name="S_Serial_No" id="S_Serial_No" required>
<p><input TYPE="SUBMIT" NAME="b1" id="SUMBIT" VALUE="Find Device" class="buttonText"></p>
</form>
This is form 2:
<form name="highsearch" id="highsearch" method="post" action="action.html" target="formresponse" style="display:none;">
<input TYPE="hidden" NAME="command" VALUE="search">
<input TYPE="hidden" NAME="file" VALUE="Repair_Project/R&S2Web.db">
<input TYPE="hidden" NAME="database" VALUE="Serial">
<input TYPE="hidden" NAME="searchfields" VALUE="S_Serial_No;S_Description">
<p><b>Please enter your Serial Number</b></p>
<input TYPE="text" size="10" name="S_Serial_No" id="S_Serial_No" required>
<p><input TYPE="SUBMIT" NAME="b1" id="SUMBIT" VALUE="Find Device" class="buttonText"></p>
</form>
My issue is I don't know how to finish the Javascript to get the desired affect.
<script>
function func(a) {
var el;
if(a === 1) {
el = document.getElementById("lowsearch");
}
if(a === 2) {
el = document.getElementById("highsearch");
}
document.getElementById('button7').onclick = function () {
func(1);
};
document.getElementById('button8').onclick = function() {
func(2)
};
</script>

What you want to do is change the style property on the forms based on which one you want to show/hide. Inside the if blocks in your func function, you can set the property display values.
function func(a) {
if(a === 1) {
document.getElementById("lowsearch").style.display = "block";
document.getElementById("highsearch").style.display = "none";
}
if(a === 2) {
document.getElementById("lowsearch").style.display = "none";
document.getElementById("highsearch").style.display = "block";
}
}
You can view an example of it working at this fiddle: http://jsfiddle.net/thetimbanks/mzvkxr7d/

How to radio button change form action address

How to make radio button change the form action address
I got a form which have the following
and a radio button
<b>Would you like to to make payment ? <input type="radio" name="choice" value="yes">Yes <input type="radio" name="choice" value="no" checked>No</b>'
If user selection is no (default checked) the form action will still be register_page4.php
but if user selected yes and press the submit button:
<input id="btnSubmit" type="submit" value="Next" />
I would like the form action to be payment.php instead of register_page4.php, how do I achieve it.
I make the changes and this is what I type
<html>
<head>
</head>
<body>
<form name="form1" method="post" action="register_page4.php">
Would you like to make an appointment for collection ?
<input type="radio" name="collection" value="yes">Yes
<input type="radio" name="collection" value="no" checked>No
<input id="btnSubmit" type="submit" value="Next" />
</form>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
<script src="http://code.jquery.com/jquery-1.9.1.js"></script>
<script>
jQuery(document).ready(function($) {
var form = $('form[name="form1"]'),
radio = $('input[name="choice"]'),
choice = '';
radio.change(function(e) {
choice = this.value;
if (choice === 'yes') {
form.attr('action', 'payment.php');
} else {
form.attr('action', 'register_page4.php');
}
});
});
</script>
</body>
</html>
But the result is still going to register_page4.php even I click on the radio button with yes, I try click on both and both still go to register_page4.php

Here is an example using a javascript solution. Basically, when changing the radio button, the attribute of the form (here with id #yourForm) is altered with the correct action.
jQuery(document).ready(function($) {
var form = $('form[name="form1"]'),
radio = $('input[name="collection"]'),
choice = '';
radio.change(function(e) {
choice = this.value;
if (choice === 'yes') {
form.attr('action', 'payment.php');
} else {
form.attr('action', 'register_page4.php');
}
});
});

depending on whether you are using POST or GET method, it's either:
$nextPage = ($_POST['choice']=='yes') ? 'payment.php' : 'register_page4.php';
OR
$nextPage = ($_GET['choice']=='yes') ? 'payment.php' : 'register_page4.php';
then simply redirect to $nextPage

$("input[name=choice]").change(function(){
if ($("input[name=choice]").val() == 'yes'){
$("#formId").attr("action","payment.php");
}
else
{
$("#formId").attr("action","register_page4.php");
}
});

Disable Submit button if checked = No
Working JSFiddle DEMO
HTML
<form action="payment.php" method="POST">
<input name="choice" type="radio" id="choiceyes" value="yes" />Yes
<input name="choice" type="radio" id="choiceno" value="no" checked="checked" />No
<input id="btnSubmit" name="btnSubmit" type="submit" value="Next" /></form>
Script
$(function () {
var $join = $("input[name=btnSubmit]");
var processJoin = function (element) {
if(element.id == "choiceno") {
$join.attr("disabled", "disabled");
}
else {
$join.removeAttr("disabled")
}
};
$(":radio[name=choice]").click(function () {
processJoin(this);
}).filter(":checked").each(function () {
processJoin(this);
});
});

Add Document Ready
<script>
$(document).ready(function(){
$("input[name=choice]").change(function(){
if ($("input[name=choice]").val() == 'yes'){
$("#form1").attr("action","payment.php");
}
else
{
$("#form1").attr("action","register_page4.php");
}
});
});
</script>
If continue the issue try to remove the action:
Remove action from form.
<form name="form1" method="post" action="register_page4.php">
Correct
<form name="form1" method="post">

Use the following code:
<body>
<form name="form1" id="form1" method="post" action="register_page4.php">
Would you like to make an appointment for collection ?
<input type="radio" name="collection" value="yes" onChange="if(this.checked){document.getElementById('form1').action='payment.php'}">Yes
<input type="radio" name="collection" value="no" checked>No
<input type="submit">
</form>
</body>
Here is a demo

JavaScript Form - changeable URL's for the submit button

I need to make a form, example:
<form id="myform" name="myform" method="get">
<input type="radio" checked="checked" name="Answer" value="yes" />Yes
<input type="radio" name="Answer" value="no" />No
<input id="submit" name="submit" src="images/submit.jpg" type="image" />
</form>
Questions:
1. How can I set a URL to the submit button (on click)?
2. How can i change this URL depending on when the user selects either the Yes or No answer?

Set the form action attribute to the YES URL
$('input:radio').on('click', function(){
if($(this).val() == "yes"){
$('#myform').attr('action', 'YES_URL');
}
else {
$('#myform').attr('action', 'NO_URL');
}
});

A submit button fires the event submit to a adress that is defined in the action attribute from form tag. So here comes one option:
<script type="text/javascript">
function mytarget ()
{
var myFormObject = document.myforma;
var chk = false;
for (i = 0; i < myFormObject.Answer.length; i++)
{
if (myFormObject.Answer[i].checked && myFormObject.Answer[i].value == 'yes')
{
myFormObject.action = "http://urltforthevalueYes.com";
chk = true;
break;
} else if (myFormObject.Answer[i].checked && myFormObject.Answer[i].value == 'no') {
myFormObject.action = "http://urltforthevalueNo.com";
chk = true;
break;
}
}
if (chk == true) {myFormObject.submit();} else {alert("Please select an option");}
}
</script>
Update:
I had to change my javascript code because there was two mistakes in there. Also added the new HTML code.
Changes you have to do:
add the action attribute to the open form tag <form id="myform" name="myform" method="get" action="">
Change the name of your submit button. The use of submit creates a conflict between your button and the javascript function <input id="send" name="send" src="images/submit.jpg" type="image" />
Add at you submit button the attribute onClick with the reference to the method mytarget() <input id="send" name="send" src="images/submit.jpg" type="image" onClick="mytarget()"/>