I am wanting to create the following using CSS, HTML and JavaScript
Course1 //dropdown selection//
....
Course2 //dropdown selection//
.....
WINNER
(RADIO checked for Course1) OR (RADIO clicked for Course2)
//automatically populated from either Course1 or Course2 depending on Radio checked//
but my dropdown selection and radio selection hamper each other.
When I have the name from the radio the same "winnerselected" the radio works, but the copying from the course1 or course2 doesn't work.
Maybe someone has created code like this somewhere else and knows how to get around it?
Any assistance will be appreciate.
code as follows:
<!--Make sure the form has the autocomplete function switched off:-->
<form autocomplete="off" action="/action_page.php">
<div class="autocomplete" style="width:300px;">
Course 1
<input id="myInput" type="text" name="golfcoursename1" placeholder="Golf
Course">
<form autocomplete="off" action="/action_page.php">
<div class="autocomplete" style="width:300px;">
Course 2
<input id="myInput1" type="text" name="golfcoursename2" placeholder="Golf
Course">
</div>
<p>
WINNER
<p>
<input type="radio" id="Course1" name="winnerselected" value="Course1"
onclick="FillWinner(this.form)">
<label for="Course1">Course 1</label>
<input type="radio" id="Course2" name="winnerselected" value="Course2"
onclick="FillWinner2(this.form)">
<label for="Course2">Course 2</label><br>
<input type="text" id="winner" name="Winner" placeholder="Winner">
<p>
</p>
<input type="submit">
</form>
<script>
function FillWinner(f) {
if(f.winnerselected.checked == true) {
f.winner.value = f.golfcoursename1.value;
if(f.winnerselected.checked == true)
f.winner.value = f.golfcoursename2.value;
}}
</script>
First, your HTML is not valid as you have a second form, with no closing tag, nested in the first one. Also, while is is legal to not close a p element, you really should for clarity sake.
Next, remove inline styles and inline JavaScript from your HTML. It just clutters up the code, causes redundancy, and is harder to read and maintain. Instead break your work into HTML, CSS, and JavaScript sections.
It's not clear what you exactly want, but my guess is that whichever radio button is clicked should dictate which textbox value becomes the winner. Based on that, see the comments inline below for a description of how the code works.
.autocomplete { width:300px; }
<!--Make sure the form has the autocomplete function switched off:-->
<form autocomplete="off" action="/action_page.php">
<div class="courses">
<div class="autocomplete">
Course 1 <input id="myInput" name="golfcoursename1" placeholder="Golf Course">
</div>
<div class="autocomplete">
Course 2 <input id="myInput1" name="golfcoursename2" placeholder="Golf Course">
</div>
</div>
<p>WINNER</p>
<p id="radioContainer">
<input type="radio" id="Course1" name="winnerselected" value="Course1">
<label for="Course1">Course 1</label>
<input type="radio" id="Course2" name="winnerselected" value="Course2">
<label for="Course2">Course 2</label><br>
<input type="text" id="winner" name="Winner" placeholder="Winner">
</p>
<input type="submit">
</form>
<script>
// Don't use inline HTML event attributes like onclick.
// Separate your JavaScript from your HTML
// Get references to the element(s) you'll need to work with
// Get all the elements that have a name attribute that starts with "golfcoursename"
const courseNames = document.querySelectorAll("[name^='golfcoursename']");
// Get all the elements that have a name attribute that is exactly "winnerselected"
const radioButtons = document.querySelectorAll("[name='winnerselected']");
const winner = document.getElementById("winner");
// Here's how to set up events in JS
const radCont = document.getElementById("radioContainer").addEventListener("click", fillWinner);
function fillWinner(event) {
// Look at the radiobuttons collection and get the index of the selected radio button from it.
const indexOfTextbox = Array.from(radioButtons).indexOf(event.target);
// Set the value of the winner textbox to textbox with the same index as the clicked radio button
winner.value = courseNames[indexOfTextbox].value;
}
</script>
When using the newer browsers that support HTML5 (FireFox 4 for example);
and a form field has the attribute required='required';
and the form field is empty/blank;
and the submit button is clicked;
the browsers detects that the "required" field is empty and does not submit the form; instead browser shows a hint asking the user to type text into the field.
Now, instead of a single text field, I have a group of checkboxes, out of which at least one should be checked/selected by the user.
How can I use the HTML5 required attribute on this group of checkboxes?
(Since only one of the checkboxes needs to be checked, I can't put the required attribute on each and every checkbox)
ps. I am using simple_form, if that matters.
UPDATE
Could the HTML 5 multiple attribute be helpful here? Has anyone use it before for doing something similar to my question?
UPDATE
It appears that this feature is not supported by the HTML5 spec: ISSUE-111: What does input.#required mean for #type = checkbox?
(Issue status: Issue has been marked closed without prejudice.)
And here is the explanation.
UPDATE 2
It's an old question, but wanted to clarify that the original intent of the question was to be able to do the above without using Javascript - i.e. using a HTML5 way of doing it. In retrospect, I should've made the "without Javascript" more obvious.
Unfortunately HTML5 does not provide an out-of-the-box way to do that.
However, using jQuery, you can easily control if a checkbox group has at least one checked element.
Consider the following DOM snippet:
<div class="checkbox-group required">
<input type="checkbox" name="checkbox_name[]">
<input type="checkbox" name="checkbox_name[]">
<input type="checkbox" name="checkbox_name[]">
<input type="checkbox" name="checkbox_name[]">
</div>
You can use this expression:
$('div.checkbox-group.required :checkbox:checked').length > 0
which returns true if at least one element is checked.
Based on that, you can implement your validation check.
Its a simple trick. This is jQuery code that can exploit the html5 validation by changing the required properties if any one is checked. Following is your html code (make sure that you add required for all the elements in the group.)
<input type="checkbox" name="option[]" id="option-1" value="option1" required/> Option 1
<input type="checkbox" name="option[]" id="option-2" value="option2" required/> Option 2
<input type="checkbox" name="option[]" id="option-3" value="option3" required/> Option 3
<input type="checkbox" name="option[]" id="option-4" value="option4" required/> Option 4
<input type="checkbox" name="option[]" id="option-5" value="option5" required/> Option 5
Following is jQuery script, which disables further validation check if any one is selected. Select using name element.
$cbx_group = $("input:checkbox[name='option[]']");
$cbx_group = $("input:checkbox[id^='option-']"); // name is not always helpful ;)
$cbx_group.prop('required', true);
if($cbx_group.is(":checked")){
$cbx_group.prop('required', false);
}
Small gotcha here: Since you are using html5 validation, make sure you execute this before the it gets validated i.e. before form submit.
// but this might not work as expected
$('form').submit(function(){
// code goes here
});
// So, better USE THIS INSTEAD:
$('button[type="submit"]').on('click', function() {
// skipping validation part mentioned above
});
HTML5 does not directly support requiring only one/at least one checkbox be checked in a checkbox group. Here is my solution using Javascript:
HTML
<input class='acb' type='checkbox' name='acheckbox[]' value='1' onclick='deRequire("acb")' required> One
<input class='acb' type='checkbox' name='acheckbox[]' value='2' onclick='deRequire("acb")' required> Two
JAVASCRIPT
function deRequireCb(elClass) {
el = document.getElementsByClassName(elClass);
var atLeastOneChecked = false; //at least one cb is checked
for (i = 0; i < el.length; i++) {
if (el[i].checked === true) {
atLeastOneChecked = true;
}
}
if (atLeastOneChecked === true) {
for (i = 0; i < el.length; i++) {
el[i].required = false;
}
} else {
for (i = 0; i < el.length; i++) {
el[i].required = true;
}
}
}
The javascript will ensure at least one checkbox is checked, then de-require the entire checkbox group. If the one checkbox that is checked becomes un-checked, then it will require all checkboxes, again!
I guess there's no standard HTML5 way to do this, but if you don't mind using a jQuery library, I've been able to achieve a "checkbox group" validation using webshims' "group-required" validation feature:
The docs for group-required say:
If a checkbox has the class 'group-required' at least one of the
checkboxes with the same name inside the form/document has to be
checked.
And here's an example of how you would use it:
<input name="checkbox-group" type="checkbox" class="group-required" id="checkbox-group-id" />
<input name="checkbox-group" type="checkbox" />
<input name="checkbox-group" type="checkbox" />
<input name="checkbox-group" type="checkbox" />
<input name="checkbox-group" type="checkbox" />
I mostly use webshims to polyfill HTML5 features, but it also has some great optional extensions like this one.
It even allows you to write your own custom validity rules. For example, I needed to create a checkbox group that wasn't based on the input's name, so I wrote my own validity rule for that...
we can do this easily with html5 also, just need to add some jquery code
Demo
HTML
<form>
<div class="form-group options">
<input type="checkbox" name="type[]" value="A" required /> A
<input type="checkbox" name="type[]" value="B" required /> B
<input type="checkbox" name="type[]" value="C" required /> C
<input type="submit">
</div>
</form>
Jquery
$(function(){
var requiredCheckboxes = $('.options :checkbox[required]');
requiredCheckboxes.change(function(){
if(requiredCheckboxes.is(':checked')) {
requiredCheckboxes.removeAttr('required');
} else {
requiredCheckboxes.attr('required', 'required');
}
});
});
Inspired by the answers from #thegauraw and #Brian Woodward, here's a bit I pulled together for JQuery users, including a custom validation error message:
$cbx_group = $("input:checkbox[name^='group']");
$cbx_group.on("click", function () {
if ($cbx_group.is(":checked")) {
// checkboxes become unrequired as long as one is checked
$cbx_group.prop("required", false).each(function () {
this.setCustomValidity("");
});
} else {
// require checkboxes and set custom validation error message
$cbx_group.prop("required", true).each(function () {
this.setCustomValidity("Please select at least one checkbox.");
});
}
});
Note that my form has some checkboxes checked by default.
Maybe some of you JavaScript/JQuery wizards could tighten that up even more?
I added an invisible radio to a group of checkboxes.
When at least one option is checked, the radio is also set to check.
When all options are canceled, the radio is also set to cancel.
Therefore, the form uses the radio prompt "Please check at least one option"
You can't use display: none because radio can't be focused.
I make the radio size equal to the entire checkboxes size, so it's more obvious when prompted.
HTML
<form>
<div class="checkboxs-wrapper">
<input id="radio-for-checkboxes" type="radio" name="radio-for-required-checkboxes" required/>
<input type="checkbox" name="option[]" value="option1"/>
<input type="checkbox" name="option[]" value="option2"/>
<input type="checkbox" name="option[]" value="option3"/>
</div>
<input type="submit" value="submit"/>
</form>
Javascript
var inputs = document.querySelectorAll('[name="option[]"]')
var radioForCheckboxes = document.getElementById('radio-for-checkboxes')
function checkCheckboxes () {
var isAtLeastOneServiceSelected = false;
for(var i = inputs.length-1; i >= 0; --i) {
if (inputs[i].checked) isAtLeastOneCheckboxSelected = true;
}
radioForCheckboxes.checked = isAtLeastOneCheckboxSelected
}
for(var i = inputs.length-1; i >= 0; --i) {
inputs[i].addEventListener('change', checkCheckboxes)
}
CSS
.checkboxs-wrapper {
position: relative;
}
.checkboxs-wrapper input[name="radio-for-required-checkboxes"] {
position: absolute;
margin: 0;
top: 0;
left: 0;
width: 100%;
height: 100%;
-webkit-appearance: none;
pointer-events: none;
border: none;
background: none;
}
https://jsfiddle.net/codus/q6ngpjyc/9/
I had the same problem and I my solution was this:
HTML:
<form id="processForm.php" action="post">
<div class="input check_boxes required wish_payment_type">
<div class="wish_payment_type">
<span class="checkbox payment-radio">
<label for="wish_payment_type_1">
<input class="check_boxes required" id="wish_payment_type_1" name="wish[payment_type][]" type="checkbox" value="1">Foo
</label>
</span>
<span class="checkbox payment-radio">
<label for="wish_payment_type_2">
<input class="check_boxes required" id="wish_payment_type_2" name="wish[payment_type][]" type="checkbox" value="2">Bar
</label>
</span>
<span class="checkbox payment-radio">
<label for="wish_payment_type_3">
<input class="check_boxes required" id="wish_payment_type_3" name="wish[payment_type][]" type="checkbox" value="3">Buzz
</label>
<input id='submit' type="submit" value="Submit">
</div>
</form>
JS:
var verifyPaymentType = function () {
var checkboxes = $('.wish_payment_type .checkbox');
var inputs = checkboxes.find('input');
var first = inputs.first()[0];
inputs.on('change', function () {
this.setCustomValidity('');
});
first.setCustomValidity(checkboxes.find('input:checked').length === 0 ? 'Choose one' : '');
}
$('#submit').click(verifyPaymentType);
https://jsfiddle.net/oywLo5z4/
You don't need jQuery for this. Here's a vanilla JS proof of concept using an event listener on a parent container (checkbox-group-required) of the checkboxes, the checkbox element's .checked property and Array#some.
const validate = el => {
const checkboxes = el.querySelectorAll('input[type="checkbox"]');
return [...checkboxes].some(e => e.checked);
};
const formEl = document.querySelector("form");
const statusEl = formEl.querySelector(".status-message");
const checkboxGroupEl = formEl.querySelector(".checkbox-group-required");
checkboxGroupEl.addEventListener("click", e => {
statusEl.textContent = validate(checkboxGroupEl) ? "valid" : "invalid";
});
formEl.addEventListener("submit", e => {
e.preventDefault();
if (validate(checkboxGroupEl)) {
statusEl.textContent = "Form submitted!";
// Send data from e.target to your backend
}
else {
statusEl.textContent = "Error: select at least one checkbox";
}
});
<form>
<div class="checkbox-group-required">
<input type="checkbox">
<input type="checkbox">
<input type="checkbox">
<input type="checkbox">
</div>
<input type="submit" />
<div class="status-message"></div>
</form>
If you have multiple groups to validate, add a loop over each group, optionally adding error messages or CSS to indicate which group fails validation:
const validate = el => {
const checkboxes = el.querySelectorAll('input[type="checkbox"]');
return [...checkboxes].some(e => e.checked);
};
const allValid = els => [...els].every(validate);
const formEl = document.querySelector("form");
const statusEl = formEl.querySelector(".status-message");
const checkboxGroupEls = formEl.querySelectorAll(".checkbox-group-required");
checkboxGroupEls.forEach(el =>
el.addEventListener("click", e => {
statusEl.textContent = allValid(checkboxGroupEls) ? "valid" : "invalid";
})
);
formEl.addEventListener("submit", e => {
e.preventDefault();
if (allValid(checkboxGroupEls)) {
statusEl.textContent = "Form submitted!";
}
else {
statusEl.textContent = "Error: select at least one checkbox from each group";
}
});
<form>
<div class="checkbox-group-required">
<label>
Group 1:
<input type="checkbox">
<input type="checkbox">
<input type="checkbox">
<input type="checkbox">
</label>
</div>
<div class="checkbox-group-required">
<label>
Group 2:
<input type="checkbox">
<input type="checkbox">
<input type="checkbox">
<input type="checkbox">
</label>
</div>
<input type="submit" />
<div class="status-message"></div>
</form>
I realize there are a ton of solutions here, but I found none of them hit every requirement I had:
No custom coding required
Code works on page load
No custom classes required (checkboxes or their parent)
I needed several checkbox lists to share the same name for submitting Github issues via their API, and was using the name label[] to assign labels across many form fields (two checkbox lists and a few selects and textboxes) - granted I could have achieved this without them sharing the same name, but I decided to try it, and it worked.
The only requirement for this one is jQuery, which could easily be eliminated if you wanted to rewrite it in vanilla JS. You can combine this with #ewall's great solution to add custom validation error messages.
/* required checkboxes */
jQuery(function ($) {
var $requiredCheckboxes = $("input[type='checkbox'][required]");
/* init all checkbox lists */
$requiredCheckboxes.each(function (i, el) {
//this could easily be changed to suit different parent containers
var $checkboxList = $(this).closest("div, span, p, ul, td");
if (!$checkboxList.hasClass("requiredCheckboxList"))
$checkboxList.addClass("requiredCheckboxList");
});
var $requiredCheckboxLists = $(".requiredCheckboxList");
$requiredCheckboxLists.each(function (i, el) {
var $checkboxList = $(this);
$checkboxList.on("change", "input[type='checkbox']", function (e) {
updateCheckboxesRequired($(this).parents(".requiredCheckboxList"));
});
updateCheckboxesRequired($checkboxList);
});
function updateCheckboxesRequired($checkboxList) {
var $chk = $checkboxList.find("input[type='checkbox']").eq(0),
cblName = $chk.attr("name"),
cblNameAttr = "[name='" + cblName + "']",
$checkboxes = $checkboxList.find("input[type='checkbox']" + cblNameAttr);
if ($checkboxList.find(cblNameAttr + ":checked").length > 0) {
$checkboxes.prop("required", false);
} else {
$checkboxes.prop("required", true);
}
}
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<form method="post" action="post.php">
<div>
Type of report:
</div>
<div>
<input type="checkbox" id="chkTypeOfReportError" name="label[]" value="Error" required>
<label for="chkTypeOfReportError">Error</label>
<input type="checkbox" id="chkTypeOfReportQuestion" name="label[]" value="Question" required>
<label for="chkTypeOfReportQuestion">Question</label>
<input type="checkbox" id="chkTypeOfReportFeatureRequest" name="label[]" value="Feature Request" required>
<label for="chkTypeOfReportFeatureRequest">Feature Request</label>
</div>
<div>
Priority
</div>
<div>
<input type="checkbox" id="chkTypeOfContributionBlog" name="label[]" value="Priority: High" required>
<label for="chkPriorityHigh">High</label>
<input type="checkbox" id="chkTypeOfContributionBlog" name="label[]" value="Priority: Medium" required>
<label for="chkPriorityMedium">Medium</label>
<input type="checkbox" id="chkTypeOfContributionLow" name="label[]" value="Priority: Low" required>
<label for="chkPriorityMedium">Low</label>
</div>
<div>
<input type="submit" />
</div>
</form>
Really simple way to verify if at least one checkbox is checked:
function isAtLeastOneChecked(name) {
let checkboxes = Array.from(document.getElementsByName(name));
return checkboxes.some(e => e.checked);
}
Then you can implement whatever logic you want to display an error.
Here is another simple trick using Jquery!!
HTML
<form id="hobbieform">
<div>
<input type="checkbox" name="hobbies[]">Coding
<input type="checkbox" name="hobbies[]">Gaming
<input type="checkbox" name="hobbies[]">Driving
</div>
</form>
JQuery
$('#hobbieform').on("submit", function (e) {
var arr = $(this).serialize().toString();
if(arr.indexOf("hobbies") < 0){
e.preventDefault();
alert("You must select at least one hobbie");
}
});
That's all.. this works because if none of the checkbox is selected, nothing as regards the checkbox group(including its name) is posted to the server
Pure JS solution:
const group = document.querySelectorAll('[name="myCheckboxGroup"]');
function requireLeastOneChecked() {
var atLeastOneChecked = false;
for (i = 0; i < group.length; i++)
if (group[i].checked)
atLeastOneChecked = true;
if (atLeastOneChecked)
for (i = 0; i < group.length; i++)
group[i].required = false;
else
for (i = 0; i < group.length; i++)
group[i].required = true;
}
requireLeastOneChecked(); // onload
group.forEach(function ($el) {
$el.addEventListener('click', function () { requireLeastOneChecked(); })
});
Hi just use a text box additional to group of check box.When clicking on any check box put values in to that text box.Make that that text box required and readonly.
A general Solution without change the submit event or knowing the name of the checkboxes
Build a Function, which marks the Checkbox as HTML5-Invalid
Extend Change-Event and check validity on the start
jQuery.fn.getSiblingsCheckboxes = function () {
let $this = $(this);
let $parent = $this.closest('form, .your-checkbox-listwrapper');
return $parent.find('input[type="checkbox"][name="' + $this.attr('name')+'"]').filter('*[required], *[data-required]');
}
jQuery.fn.checkRequiredInputs = function() {
return this.each(function() {
let $this = $(this);
let $parent = $this.closest('form, .your-checkbox-list-wrapper');
let $allInputs = $this.getSiblingsCheckboxes();
if ($allInputs.filter(':checked').length > 0) {
$allInputs.each(function() {
// this.setCustomValidity(''); // not needed
$(this).removeAttr('required');
$(this).closest('li').css('color', 'green'); // for debugging only
});
} else {
$allInputs.each(function() {
// this.reportValidity(); // not needed
$(this).attr('required', 'required');
$(this).closest('li').css('color', 'red'); // for debugging only
});
}
return true;
});
};
$(document).ready(function() {
$('input[type="checkbox"][required="required"], input[type="checkbox"][required]').not('*[data-required]').not('*[disabled]').each(function() {
let $input = $(this);
let $allInputs = $input.getSiblingsCheckboxes();
$input.attr('data-required', 'required');
$input.removeAttr('required');
$input.on('change', function(event) {
$input.checkRequiredInputs();
});
});
$('input[type="checkbox"][data-required="required"]').checkRequiredInputs();
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/2.0.0/jquery.min.js"></script>
</head>
<form>
<ul>
<li><input type="checkbox" id="checkbox1" name="countries" value="Argentina" required="required">Argentina</li>
<li><input type="checkbox" id="checkbox2" name="countries" value="France" required="required">France</li>
<li><input type="checkbox" id="checkbox3" name="countries" value="Germany" required="required">Germany</li>
<li><input type="checkbox" id="checkbox4" name="countries" value="Japan" required="required">Japan</li>
<li><input type="checkbox" id="checkbox5" name="countries" value="Australia" required="required">Australia</li>
</ul>
<input type="submit" value="Submit">
</form>
Try:
self.request.get('sports_played', allow_multiple=True)
or
self.request.POST.getall('sports_played')
More specifically:
When you are reading data from the checkbox array, make sure array has:
len>0
In this case:
len(self.request.get('array', allow_multiple=True)) > 0
I'm trying to have the email/phone number section of a contact form hidden or visible depending on whether the user picks the phone or email radio button, but I cannot figure out why it is not working for me.
I've searched through stack overflow & w3Schools, and I'm pretty certain I'm using the correct syntax but it will still not show/hide depending on the radio buttons.
Any help would be hugely appreciated!
HTML
<form name="contactForm" id="contactForm" method="post" action="result.php">
<fieldset>
<!-- Client's contact details -->
<legend>Contact Details</legend>
<label for="fullname">Full Name:</label>
<input type="text" name="contact" id="fullname" required>
<label>Preferred contact method:</label>
<input type="radio" name="contact" value="rdoPhone" id="rdoPhone" checked="checked" onclick="cPhone()" >Phone
<input type="radio" name="contact" value="rdoEmail" id="rdoEmail" onclick="cEmail()" >Email
<label for="phonenumber">Phone Number:</label>
<input type="text" name="contact" id="phonenumber">
<label for="email">Email:</label>
<input type="text" name="contact" id="email">
</fieldset>
</form>
CSS
#email {
display:none;
}
#phonenumber {
display:none;
}
Javascript
function cPhone() {
if (document.getElementById("rdoPhone").checked)
{ document.getElementById("phonenumber").style.display = "block"; }
}
function cEmail(){
if (document.getElementById("rdoEmail").checked)
{ document.getElementById("email").style.display = "block"; }
}
Since phone number is checked by default, you should not hide it initially.
You don't have to check for the checked property on click of a radio in a radio button group, because a click will always select it.
You can use a common function for this purpose as follows -
apply the class hide given below initially for the email.
call the function showHide(this) given below onClick of both radios
css
.hide {
display:none;
}
js
function showHide(elm) {
var phone = document.getElementById("phonenumber");
var email = document.getElementById("email")
if(elm.id == 'rdoPhone'){
phone.classList.remove('hide');
email.classList.add('hide');
}
else
{
phone.classList.add('hide');
email.classList.remove('hide');
}
}
Demo
It is faster to apply it directly in javascript:
$('#id-element').css('display', 'block');
$('#id-element').css('display', 'none');
I got another probably basic question about Javascript but I just can't get it to work.
I have a form with a red background like this:
<form >
<input type="text" style="background-color:#F00;" id="blok1"/> <br>
<input type="text" style="background-color:#F00;" id="blok2"/> <br>
<input type="text" style="background-color:#F00;" id="blok3"/> <br>
<input type="text" style="background-color:#F00;" id="blok4"/> <br>
<input type="text" style="background-color:#F00;" id="blok5"/> <br>
<input type="text" style="background-color:#F00;" id="blok6"/> <br>
</form>
The problem is that i want to change the background-color as soon as you type in more than 2 characters in the textbox. I know this is able to change with a submit button but i want to have it instantly, as soon as you type something.
You need to use the keyup or keydown events:
var inputs = document.getElementsByTagName('input');
for (var i=0; i<inputs.length; i++) {
inputs[i].addEventListener('keyup', function(evt) {
var input = evt.target;
if (input.value.length > 2) {
input.style.backgroundColor = '#0F0';
} else {
input.style.backgroundColor = '#F00';
}
});
}
DEMO: http://jsbin.com/oSiroHo/1/edit
PS: You might want to use your favorite library to deal with cross-browser event issues. The code above works for well-behaved browsers.
Im trying to create a javascript block inside of a webpage im working on. I havent done javascript since highschool and it doesnt seem to want to come back to me :(
In this block of code i want to have 4 sets of radio buttons, each time a selection is picked,
a price will be inputed to a variable for each radio group. i.e
var firstPrice = $25
var secondPrice = $56
var thirdPrice = $80
var fourthPrice = $90
then after each radio group has one selection there will be a function attached to the submit button that adds up each price to display the final amount inside of a hidden field
var totalPrice = (firstPrice + secondPrice + thirdPrice + fourthPrice)
My question is, how do i attach a number value to a radio button within a group, same name but id is different in each group. Then do i just create a function that adds all the price groups up and then set the submit button to onClick = totalPrice();
Here is an example of one set of radio buttons:
<label>
<input type="radio" name="model" value="radio" id="item_0" />
item 1</label>
<br />
<label>
<input type="radio" name="model" value="radio" id="item_1" />
item2</label>
<br />
<label>
<input type="radio" name="model" value="radio" id="item_2" />
item3</label>
<br />
<label>
<input type="radio" name="model" value="radio" id="item_3" />
Item4</label>
<br />
<label>
<input type="radio" name="model" value="radio" id="item_4" />
item5</label>
</form>
then my script looks something like:
function finalPrice90{
var selectionFirst = document.modelGroup.value;
var selectionSecond = document.secondGroup.value;
var selectionThird = document.thirdGroup.value;
var selectionFourth = document.fourthGroup.Value;
var totalPrice = (selectionFirst + selectionSecond + selectionThird + selectionFourth);
}
Try this fiddle
http://jsfiddle.net/tariqulazam/ZLQXB/
Set the value attribute of your radio inputs to the price each radio button should represent.
When it's time to calculate, simply loop through each group and get the value attribute if the checked radio.
Because the value attribute is a string representation of a number, you'll want to convert it back to a number before doing any math (but that's a simple parseInt or parseFloat).
Here's a working fiddle using pure JavaScript: http://jsfiddle.net/XxZwm/
A library like jQuery or Prototype (or MooTools, script.aculo.us, etc) may make this easier in the long run, depending on how much DOM manipulation code you don't want to re-invent a wheel for.
Your requirements seem pretty simple, here's an example that should answer most questions. There is a single click listener on the form so whenever there is a click on a form control, the price will be updated.
<script type="text/javascript">
//function updatePrice(el) {
function updatePrice(event) {
var el = event.target || event.srcElement;
var form = el.form;
if (!form) return;
var control, controls = form.elements;
var totalPrice = 0;
var radios;
for (var i=0, iLen=controls.length; i<iLen; i++) {
control = controls[i];
if ((control.type == 'radio' || control.type == 'checkbox') && control.checked) {
totalPrice += Number(control.value);
}
// Deal with other types of controls if necessary
}
form.totalPrice.value = '$' + totalPrice;
}
</script>
<form>
<fieldset><legend>Model 1</legend>
<input type="radio" name="model1" value="25">$25<br>
<input type="radio" name="model1" value="35">$35<br>
<input type="radio" name="model1" value="45">$45<br>
<input type="radio" name="model1" value="55">$55<br>
</fieldset>
<fieldset><legend>Model 2</legend>
<input type="radio" name="model2" value="1">$1<br>
<input type="radio" name="model2" value="2">$2<br>
<input type="radio" name="model2" value="3">$3<br>
<input type="radio" name="model2" value="4">$4<br>
<fieldset><legend>Include shipping?</legend>
<span>$5</span><input type="checkbox" value="5" name="shipping"><br>
</fieldset>
<input name="totalPrice" readonly><br>
<input type="reset" value="Clear form">
</form>
You could put a single listener on the form for click events and update the price automatically, in that case you can get rid of the update button.