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Conditionally required form field (Checkbox)

I already checked multiple sites and posts regarding this topic, but couldn't find an answer yet. I simply want to fire the following JS code if someone clicked a specific Checkbox in my form:
function updateRequirements() {
var escortWrapper = document.querySelector(".elementor-field-type-html .elementor-field-group .elementor-column .elementor-field-group-field_ceffa28 .elementor-col-100");
if (escortWrapper.style.display != 'none') {
document.getElementById('escort').required = true;
} else {
document.getElementById('escort').required = false;
}
}
You can check and test that for yourself on the following site:
Advelio Website
If you click on the second checkbox field, there is a field appearing where you can type in your name. And this field is currently optional, but I want to make this required if someone clicked the second checkbox.

You can do it like this:
function updateRequirements() {
const btn = document.getElementById('escort');
btn.required = !btn.required;
}
document.querySelector("#requireCheck").addEventListener('click', updateRequirements);
<form>
<input type="checkbox" id="requireCheck">
<label for="requireCheck">Should the the other input be required?</label>
<br>
<input type="text" id="escort">
<input type="submit" value="submit">
</form>
I simplified the function updateRequirements for the scope of this answer, but it can be changed to anything or any condition.

You have to have event listener for click event and if you dont have create one and wrote the function with logic what to do if is click

The form does not work correctly when sent

I wrote the code for a form validation.
Should work like this:
It checks (allLetter (uName)) and if it's true, then validate the next input.
If any validation is false then it should return false.
My problem is that if both validations are true, then everything is exactly false and the form is not sent.
If I set true in formValidation (), if at least one check false, the form should not be sent.
<form name='registration' method="POST" onSubmit="return formValidation();">
<label for="userName">Name:</label>
<input type="text" name="userName" size="20" />
<label for="userPhone">Phone:</label>
<input type="text" name="userPhone" size="20" />
<input type="submit" name="submit" value="Submit" />
</form>
function formValidation() {
var uName = document.registration.userName;
var uPhone = document.registration.userPhone;
if(allLetter(uName)) {
if(phone(uPhone)) {}
}
return false;
}
function phone(uPhone){
var digts = /^[0-9]+$/;
if(uPhone.value.match(digts)){
return true;
} else {
alert('Phone must have only digits');
uPhone.focus();
return false;
}
}
function allLetter(uName) {
var letters = /^[A-Za-z]+$/;
if(uName.value.match(letters)) {
return true;
}else{
alert('Username must have alphabet characters only');
uName.focus();
return false;
}
}

First, you are using a 20+ year old way to gain references to your elements (document.form.formElementNameAttributeValue) and, while this still works for legacy reasons, it doesn't follow the standard Document Object Model (DOM) API.
Next, you've broken up your validation tests into different methods (and that's certainly not a bad idea for reusability), but in this case is is adding a ton of code that you just don't need. I've always found it's best to start simple and get the code working, then refactor it.
You're also not using the <label> elements correctly.
One other point, your form is set to send its data via a POST request. POST should only be used when you are changing the state of the server (i.e. you are adding, editing or deleting some data on the server). If that's what your form does, you'r fine. But, if not, you should be using a GET request.
Lastly, you are also using a 20+ year old technique for setting up event handlers using inline HTML event attributes (onsubmit), which should no longer be used for many reasons. Additionally, when using this technique, you have to use return false from your validation function and then return in front of the validation function name in the attribute to cancel the event instead of just using event.preventDefault().
So, here is a modern, standards-based approach to your validation:
// Get references to the elements you'll be working with using the DOM API
var frm = document.querySelector("form[name='registration']");
var user = document.getElementById("userName");
var phone = document.getElementById("userPhone");
// Set up event handlers in JavaScript, not with HTML attributes
frm.addEventListener("submit", formValidation);
// Validation function will automatically be passed a reference
// the to event it's associated with (the submit event in this case).
// As you can see, the function is prepared to recieve that argument
// with the "event" parameter.
function formValidation(event) {
var letters = /^[A-Za-z]+$/;
var digts = /^[0-9]+$/;
// This will not only be used to show any errors, but we'll also use
// it to know if there were any errors.
var errorMessage = "";
// Validate the user name
if(user.value.match(letters)) {
// We've already validated the user name, so all we need to
// know now is if the phone is NOT valid. By prepending a !
// to the test, we reverse the logic and are now testing to
// see if the phone does NOT match the regular expression
if(!phone.value.match(digts)) {
// Invalid phone number
errorMessage = "Phone must have only digits";
phone.focus();
}
} else {
// Invalid user name
errorMessage = "Username must have alphabet characters only";
user.focus();
}
// If there is an error message, we've got a validation issue
if(errorMessage !== ""){
alert(errorMessage);
event.preventDefault(); // Stop the form submission
}
}
<!-- 20 is the default size for input elements, but if you do
want to change it do it via CSS, not HTML attributes -->
<form name='registration' method="POST">
<!-- The for attribute of a label must be equal to the id
attribute of some other element, not the name attribute -->
<label for="userName">Name:</label>
<input type="text" name="userName" id="userName">
<label for="userPhone">Phone:</label>
<input type="text" name="userPhone" id="userPhone">
<input type="submit" name="submit" value="Submit">
</form>

How to set text box to appear blank after .click function

So I have a simple log in that requires a user to input values from a json file into two different text boxes ,when the user name and (in this case I have used ID as password) matches then an alert appears to say... "welcome"
After the .click function is carried out the users text still remains in the text box, how can I get both text boxes to appear blank after the .click function?
$(document).ready(function() {
//Hide alert when page loads
$("#loginalert").hide();
$("#invalid").hide();
$("#loginbtn").click(function(event){
$.getJSON('result.json', function(jd) {
var id = $('#userName').val();
var name = $('#userName2').val();
var valid = false;
for (var i=0; i<jd.user.length; i++) {
if ((jd.user[i].ID == id) && (jd.user[i].name == name)) {
valid=true;
$('#loginalert').html('<img src="' + jd.user[i].imgpath + '"><br><p> Welcome: ' + jd.user[i].name + '</p><button type="button" id="btnhide" class="btn btn-primary btn-md">Hide</button>');
//show the alert after loading the information
$("#loginalert").stop().fadeIn('slow').animate({ opacity: 1.0 }, 3000)
$('#invalid').hide();
$('#btnhide').on('click', function(e){
//console.log('here');
e.preventDefault();
$('#loginalert').hide();
});
}
}
if (!valid) {
$('#invalid').fadeIn('slow');
$('#loginalert').hide();
}
});
}); });
username 1 and #username 2 are the text boxes - is there any way to get user name 2 to display in stars ****** when the user enters the password - this question is not that necessary but if i could also get that working that would be good.
thanks guys hope someone can help :)

is there any way to get user name 2 to display in stars ****** when
the user enters the password
You can use an input box with text property set as password. But that password masking character will be . instead of *. Not exactly sure, whether it will be a different character in some browsers.
<input type="password" id="txtPassword" />
text box to appear blank after .click function
You can set the .val() property of the jQuery objects of two those two textboxes.
$('#userName, #username2').val('');

Use <input type="password"> to show typing as stars.
Clear inputs by setting their value to be empty: $('#userName').val('');
And perhaps consider breaking your code down into a couple smaller functions so it's easier to follow.

document.getElementById("#myTextbox").value="";
This should get your textbox and set the value of it to "", which is blank.
Edit: JSFiddle

Another Method:
You can also add the script directly inside the button without using/creating a function.
<input id="inputId" type="name" />
<button onclick="document.querySelector('#inputId').value='';"> Clear </button>

Using querySelector:
<input id="inputId" type="name" />
<button onclick="click()"> Clear </button>
<script>
function click() {
document.querySelector('#inputId').value="";
}
</script>

jQuery/Javascript function to clear all the fields of a form [duplicate]

This question already has answers here:
Resetting a multi-stage form with jQuery
(31 answers)
Closed 9 years ago.
I am looking for a jQuery function that will clear all the fields of a form after having submitted the form.
I do not have any HTML code to show, I need something generic.
Can you help?
Thanks!

Note: this answer is relevant to resetting form fields, not clearing fields - see update.
You can use JavaScript's native reset() method to reset the entire form to its default state.
Example provided by Ryan:
$('#myForm')[0].reset();
Note: This may not reset certain fields, such as type="hidden".
UPDATE
As noted by IlyaDoroshin the same thing can be accomplished using jQuery's trigger():
$('#myForm').trigger("reset");
UPDATE
If you need to do more than reset the form to its default state, you should review the answers to Resetting a multi-stage form with jQuery.

To reset form (but not clear the form) just trigger reset event:
$('#form').trigger("reset");
To clear a form see other answers.

Something similar to $("#formId").reset() will not clear form items that have had their defaults set to something other than "". One way this can happen is a previous form submission: once a form has been submitted reset() would "reset" form values to those previously submitted which will likely not be "".
One option to clear all forms on the page, is to call a function such as the following, executing it simply as clearForms():
function clearForms()
{
$(':input').not(':button, :submit, :reset, :hidden, :checkbox, :radio').val('');
$(':checkbox, :radio').prop('checked', false);
}
If you want to reset a specific form, then modify the function as follows, and call it as clearForm($("#formId")):
function clearForm($form)
{
$form.find(':input').not(':button, :submit, :reset, :hidden, :checkbox, :radio').val('');
$form.find(':checkbox, :radio').prop('checked', false);
}
When I originally came to this page I needed a solution that takes into account form defaults being changed and is still able to clear all input items.
Note that this will not clear placeholder text.

Set the val to ""
function clear_form_elements(ele) {
$(ele).find(':input').each(function() {
switch(this.type) {
case 'password':
case 'select-multiple':
case 'select-one':
case 'text':
case 'textarea':
$(this).val('');
break;
case 'checkbox':
case 'radio':
this.checked = false;
}
});
}
<input onclick="clear_form_elements(this.form)" type="button" value="Clear All" />
<input onclick="clear_form_elements('#example_1')" type="button" value="Clear Section 1" />
<input onclick="clear_form_elements('#example_2')" type="button" value="Clear Section 2" />
<input onclick="clear_form_elements('#example_3')" type="button" value="Clear Section 3" />
You could also try something like this:
function clearForm(form) {
// iterate over all of the inputs for the form
// element that was passed in
$(':input', form).each(function() {
var type = this.type;
var tag = this.tagName.toLowerCase(); // normalize case
// it's ok to reset the value attr of text inputs,
// password inputs, and textareas
if (type == 'text' || type == 'password' || tag == 'textarea')
this.value = "";
// checkboxes and radios need to have their checked state cleared
// but should *not* have their 'value' changed
else if (type == 'checkbox' || type == 'radio')
this.checked = false;
// select elements need to have their 'selectedIndex' property set to -1
// (this works for both single and multiple select elements)
else if (tag == 'select')
this.selectedIndex = -1;
});
};
More info here and here

<form id="form" method="post" action="action.php">
<input type="text" class="removeLater" name="name" /> Username<br/>
<input type="text" class="removeLater" name="pass" /> Password<br/>
<input type="text" class="removeLater" name="pass2" /> Password again<br/>
</form>
<script>
$(function(){
$("form").submit(function(e){
//do anything you want
//& remove values
$(".removeLater").val('');
}
});
</script>

You can simply use the reset button type.
<input type="text" />
<input type="reset" />
jsfiddle
Edit: Remember that, the reset button, reset the form for the original values, so, if the field has some value set on the field <input type="text" value="Name" /> after press reset the field will reset the value inserted by user and come back with the word "name" in this example.
Reference: http://api.jquery.com/reset-selector/

I use following solution:
1) Setup Jquery Validation Plugin
2) Then:
$('your form's selector').resetForm();

function reset_form() {
$('#ID_OF_FORM').each (function(){
this.reset();
});
}

the trigger idea was smart, however I wanted to do it the jQuery way, so here is a small function which will allow you to keep chaining.
$.fn.resetForm = function() {
return this.each(function(){
this.reset();
});
}
Then just call it something like this
$('#divwithformin form').resetForm();
or
$('form').resetForm();
and of course you can still use it in the chain
$('form.register').resetForm().find('input[type="submit"]').attr('disabled','disabled')

Would something like work?
JQuery Clear Form on close

HTML
<form id="contactform"></form>
JavaScript
var $contactform = $('#contactform')
$($contactform).find("input[type=text] , textarea ").each(function(){
$(this).val('');
});
Simple and short function to clear all fields

can the name of a input tag be changed with javascript?

I want to know if its possible to change the name of the input tag with javascript or jquery, for example in this code :
<input type="radio" name="some_name" value="">
I want to change the some_name value when user select this radio button.
the reason what i want to do this is described here : How might I calculate the sum of radio button values using jQuery?

Simply elem.name = "some other name" or elem.setAttribute("name", "some other name") where elem is the element you want to alter.
And to do that on selection, use the onchange event:
<input type="radio" name="some_name" value="" onchange="if(this.selected) this.name='some other name'">
And to apply that behavior to every radio button with that name:
var inputElems = document.getElementsByTagName("input");
for (var i=inputElems.length-1; i>=0; --i) {
var elem = inputElems[i];
if ((elem.type || "").toLowerCase() == "radio" && elem.name == "some_name") {
elem.onchange = function() {
if (this.selected) {
this.name = "some other name";
}
};
}
}
But using jQuery for that is quite easier.

The jQuery way
$('input:radio[name="some_name"]').attr('name', 'new name');
Gumbo has the vanilla JavaScript way covered

Yes, you can change the name of any element with javascript. Keep in mind though that IE 6 and 7 have trouble with submitted forms where the input elements have been tinkered with in javascript (not sure if this exact case would be affected).
$('input:radio[name="some_name"]').attr('name', 'new_name');
Edit: To change it only when it is selected, here is the code for that:
$("input:radio[name='some_name']").click(function() {
if ($(this).attr('checked')) $("input:radio[name='some_name']").attr('name', 'new_name');
else $("input:radio[name='some_name']").attr('name', 'some_name');
});

Sure. If jQuery is your poison, this should do the trick:
$("input[name=some_name]").attr("name", "other_name");

I came up with this:
<input type="radio" name="some_name" value="" id="radios">
<script type="text/javascript" charset="utf-8">
$(document).ready(function()
{
$("#radios").click(function()
{
$(this).attr("name", "other_name");
});
});
</script>

Trying to change the name attribute of a radio button will cause strange, undesirable behavior in IE.
The best way to handle this is to replace the old radio button with a new one. This post may help you. If you are using jQuery, you can do it with the replaceWith function.
More information about changing name attributes in IE.