We currently use the following syntax for radio buttons:
<input type="radio" id="opt1" name="option" value="opt1" required/>
<label for="opt1">Description of Option One</label>
<input type="radio" id="opt2" name="option" value="opt2" required/>
<label for="opt2">Description of Option Two</label>
The query-processing script receives the string "opt1", which it then needs to convert to the full-text description of the option. In PHP-speak, I get:
$_POST['option'] => "opt1"
I'd like to save that step and have the full text of the description to be submitted as the value:
$_POST['option'] => "Description of Option One"
Can this be done with HTML alone -- without resorting to JavaScript-rewriting hacks and without duplicating the description text in the HTML? Thanks!
Unfortunately not.
If you have control over the form, the best solution is to use the description for the value:
<input type="radio" id="opt1" name="option" value="Description of Option One" required/>
<label for="opt1">Description of Option One</label>
<input type="radio" id="opt2" name="option" value="Description of Option Two" required/>
<label for="opt2">Description of Option Two</label>
If you don't have control over the form, then javascript is your only solution, you could use a function like the below (either inside an onload event for the page or an onsubmit event on the form:
function radioUpdate() {
document.querySelectorAll('radio').forEach(function(input) {
input.value = document.querySelector('label[for="' + input.id + '"]').text();
});
};
No, it can't.
Consider generating the HTML from your server side code in the first place. You could write a PHP function that takes the label/value as a single argument.
Related
I am aiming to create a form to handle disabled JavaScript experience for a small component on my website. Currently I have the following form:
<form method="GET" action="https://mywebsite.com/somedirectory/">
<input type="radio" id="uid1" name="someParam" value="fruity" />
<label for="uid1">Fruit</label>
<input type="radio" id="uid2" name="someParam" value="veggie" />
<label for="uid2">Vegetable</label>
...other radio options
<input type="submit" value="Submit" />
</form>
Clicking on either of the radio options and then on the submit button will result in:
option 1: https://mywebsite.com/somedirectory/?someParam=fruity
option 2: https://mywebsite.com/somedirectory/?someParam=veggie
How can I add another value for each of the radio options? Say I would like to pass someOtherParam which is unique for each option and I would like to get this as output for my options:
option 1: https://mywebsite.com/somedirectory/?someParam=fruity&someOtherParam=apple
option 2: https://mywebsite.com/somedirectory/?someParam=veggie&someOtherParam=pepper
What I have tried is:
<input type="radio" id="uid1" name="someParam" value="fruity&someOtherParam=apple" />
<input type="radio" id="uid2" name="someParam" value="veggie&someOtherParam=pepper" />
However, the & symbol is converted to %26 inside the link and feels too hacky. Is there a better way to achieve this? Also, is there a way to make sure the Submit button is only enabled once a radio option is selected?
P.S. I am aiming for pure HTML experience with no Javascript involved. Is that possible?
I'm pretty sure this is not posible in modern browsers without the use of JS. Maybe on old browsers you could do some tricks with CSS and display:none because it used to not send fields with display:none, but nowdays that is not an option.
If you can allow Javascript, you can add a data attribute to each radio option and use it to populate an extra hidden input on change.
document.querySelectorAll('input[type=radio][name="someParam"]')
.forEach(radio => radio.addEventListener('change', (event) =>
document.getElementById('someOtherParam').value = event.target.dataset.extraValue
));
<form method="GET" action="https://mywebsite.com/somedirectory/">
<input type="radio" id="uid1" name="someParam" value="fruity" data-extra-value="apple" />
<label for="uid1">Fruit</label>
<input type="radio" id="uid2" name="someParam" value="veggie" data-extra-value="pepper" />
<label for="uid2">Vegetable</label>
<input type="hidden" id="someOtherParam" name="someOtherParam">
<input type="submit" value="Submit" />
</form>
To add another radio group independent from others, use a distinct name property. For example, to add a second parameter called someOtherParam to the request, create a radio group with name="someOtherParam":
<input type="radio" id="uid3" name="someOtherParam" value="apple" />
<input type="radio" id="uid4" name="someOtherParam" value="pepper" />
And add their correspondent labels.
Also, is there a way to make sure the Submit button is only enabled once a radio option is selected?
You can add the required attribute to prevent the browser to send the form before all the inputs have a value.
Without javascript, what you're describing cannot be done.
What you could do, as other posters have suggested is:
Create radio buttons for the list of options that are possible for each category (fruits / vegetables etc)
<input type="radio" id="uid3" name="someOtherParam" value="apple" />
<input type="radio" id="uid4" name="someOtherParam" value="pepper" />
When processing the input on your server side code, check if you have received a value or not. If not, you can choose a default option (apple or whatever). On your page you can mention what the default option would be in case they don't make a selection.
You could make some of the input required as suggested, but you would still have to make check on the server side that the input has been received, since the required attribute is just a suggestion to users browsers - it won't stop a malicious persons from making a request without that parameter by running a script etc.
To submit extra information to the server, you can use a hidden input type and change value as per your needs using javascript.
HTML code
<form method="GET" action="">
<input type="radio" id="uid1" name="someParam" value="fruity" />
<label for="uid1">Fruit</label>
<input type="radio" id="uid2" name="someParam" value="veggie" />
<label for="uid2">Vegetable</label>
<input type="hidden" id="uid3" name="someOtherParam" value="" readonly required />
<input type="submit" value="Submit" onclick="onSubmit()" />
</form>
Javascript code
function onSubmit () {
let fruityRadio = document.getElementById( 'uid1' );
let veggieRadio = document.getElementById( 'uid2' );
if ( fruityRadio.checked ) {
document.getElementById( 'uid3' ).value = 'apple';
} else if ( veggieRadio.checked ) {
document.getElementById( 'uid3' ).value = 'pepper';
}
}
Easy, double up the value with a deliminator between every extra value:
HTML
<div>
<label for="uid1">
<input id="uid1" name="fruit1" type="radio" value="apple:orange" />
Fruit, Apple + Orange
</label>
</div>
<div>
<label for="uid2">
<input id="uid2" name="fruit1" type="radio" value="apple:cherry:lime" />
Fruit, Apple + Cherry + Lime
</label>
</div>
node.js
I'm not sure how node.js handles what PHP refers simply as $_POST['name_attribute_value_here'] though I do know you simply want to use .split(':') to get the two or more values from that single form. If you want more options per radio button just append a deliminator (it doesn't have to be :) between each value.
Both of those radio options have the name "fruit1" so the user can't choose both.
No JavaScript is necessary.
A minor adaptation on the server.
Extra values will obviously not appear to the server if the user doesn't select that radio form field.
Arrays
If you want to set your own key/values then just add a second deliminator:
<input name="fruit1" value="fruit:apple,fruit:lime,color:purple,planet:Earth" />
Then at the server use [whatever].split(',') to get the pairs and iterate in a loop to get each key/value. You could create an entire crazy multi-dimensional array if you really wanted to.
I hope this helps, feel free to comment if you need any further clarification.
Generate form:
const data = [
{ name: 'apple', type:"fruity" },
{ name: 'pepper', type:"veggie"}
]
const form = document.querySelector('form');
const uid = document.querySelector('#uid')
createOptions(data);
function createOptions(data){
data.forEach((e, index) => {
const f = document.createDocumentFragment();
const l = document.createElement('label');
const i = document.createElement('input');
l.setAttribute('for', `uid${index+1}`);
l.textContent=e.name;
i.setAttribute('type', `radio`);
i.setAttribute('for', `uid${index+1}`);
i.setAttribute('name', 'someOtherParam');
i.setAttribute('value', e.name);
i.dataset.otype = e.type;
f.appendChild(l);
f.appendChild(i);
form.insertBefore(f, uid);
i.addEventListener('change', onselectChange, false);
})
}
function onselectChange(event) {
uid.value = event.target.dataset.otype;
}
<form method="GET" action="https://mywebsite.com/somedirectory/">
<input type="text" id="uid" name="someParam"
style="width:0; visibility: hidden;">
<input type="submit" value="Submit" />
</form>
I can't think another way of doing this using less code, the following achieves your desired result:
<form name="form" method="GET" action="">
<input type="radio" id="uid1" name="someParam" required value="fruity" onchange="document.form.someOtherParam.value = 'apple'" />
<label for="uid1">Fruit</label>
<input type="radio" id="uid2" name="someParam" required value="veggie" onchange="document.form.someOtherParam.value = 'pepper'" />
<label for="uid2">Vegetable</label>
<input type="hidden" name="someOtherParam" value=""/>
<input type="submit" value="Submit"/>
</form>
There's only 3 changes to your example:
Add a name to the form, then add inline attributes required and onchange to each radio, finally add an input[type=hidden] to include the extra param. The first change is meant so you'll not need document.getElementById later, the second so the form won't be empty submitted and also update the hidden desired value.
I have a input <input type="text" value="1" readonly id='aaa'/>.
I would like to give it a function when user check the box then can edit the value of id=aaa.
Sample:
<input type="text" value="1" readonly/> <input type="checkbox" /> Checked this if you want to edit the value.
Thank you.
Add an onchange event to the checkbox that changes to readOnly attribute of its previous sibling (the textfield)
<input type="text" value="1" readonly id="aaa" />
<input type="checkbox" onchange="getElementById('aaa').readOnly = !this.checked" />
Checked this if you want to edit the value.
You want to use JavaScript to change the readOnly property. Set it to the opposite of whether the checkbox is checked.
document.getElementById('checksome').addEventListener('click', function() {
var changeThis = document.getElementById('readsome');
changeThis.readOnly = !this.checked;
});
<input id="readsome" type="text" value="1" readonly>
<label><input id="checksome" type="checkbox"> Click this to edit</label>
How would i add the "value" that are selected from radio boxes in html forms? So when someone selects an option it would add the other "values" onto it and total that it at the bottom of the page. And does anyone know if it could add "names" total "values" onto it as well? thanks
My code looks like this:
<h3><u>Title</u></h3><br>
<form action="">
<input type="radio" name="num" value="0">Text<br>
<input type="radio" name="num" value="2">Text<br>
<input type="radio" name="num" value="80">Text<br>
<input type="radio" name="num" value="110">Text<br>
<input type="radio" name="num" value="85">Text<br>
<input type="radio" name="num" value="120">Text<br>
</form>
You cannot. By definition, a set of radio buttons with the same name attribute contributes at most one value to the data set, the one corresponding to the selected button.
If you want something else, you should handle that server side, or use other types of controls, or redesign the entire approach.
Working example :
(using a Javascript library, jQuery, but could be done in plain JavaScript)
You mainly have to change your inputs to type="checkbox" in the HTML
What code does : when a checkbox's state is modified, all checked checkboxes' value are summed up in the last input field I've added
The checkboxes are targetted by looking for "num" in their name, if you remove that the checkbox won't be taken into account by the script.
$(function() {
$("input[name*='num']").on("change", function() {
var total = 0;
$("input[type='checkbox']:checked").each(function() {
total += Number($(this).val());
});
$("#total").val(total);
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<h3>
<u>Title</u>
</h3>
<br>
<form action="">
<input type="checkbox" name="num0" value="0">Add 0<br>
<input type="checkbox" name="num2" value="2">Add 2<br>
<input type="checkbox" name="num80" value="80">Add 80<br>
<input type="checkbox" name="num110" value="110">Add 110<br>
<input type="checkbox" name="num85" value="85">Add 85<br>
<input type="checkbox" name="numwhateveryoulike" value="120">Add 120<br>
Total <input type="text" value="0" id="total">
</form>
I'm trying to come up with a form comprised of radio buttons group where a user must select one of the options and if he doesn't there's a custom validity message.
So the logic will be:
A user forgets to select an option and the validity message shows up.
He goes back and selects any option to go proceed.
The problem is, the way things are it only goes ahead if the selected option is the one with the onclick event as shown below. If it isn't then the message will keep showing up.
I have tried to juggle around with the required, oninvalid and onclick thingies but to no avail. Any ideas?
Thanks!
<form>
<input type="radio" name="test" value="0" required oninvalid="this.setCustomValidity('Click me')" onclick="setCustomValidity('')">Zero<br>
<input type="radio" name="test" value="1" class="wrapper">One<br>
<input type="radio" name="test" value="2" class="wrapper">Two<br>
<input type="submit">
</form>
<form>
<input type="radio" id="test" name="test" value="0" oninvalid="this.setCustomValidity('Click me')" onclick="clearValidity();" required >Zero<br>
<input type="radio" name="test" value="1" onclick="clearValidity()" class="wrapper">One<br>
<input type="radio" name="test" value="2" onclick="clearValidity()" class="wrapper">Two<br>
<input type="submit">
</form>
<script>
function clearValidity()
{
document.getElementById('test').setCustomValidity('');
}
</script>
This can be written as a function to make it work on any type of <input>:
document.querySelectorAll('form *[data-custom-validity]').forEach(el => {
const firstInput = el.querySelector('input:first-of-type')
// set custom validity if first input is invalid
firstInput.addEventListener('invalid', () => firstInput.setCustomValidity(el.dataset.customValidity))
// listen on all inputs for a change
el.querySelectorAll('input').forEach(input =>
input.addEventListener('change', () => firstInput.setCustomValidity('')))
})
<form>
<div data-custom-validity="Click me.">
<input type="radio">
<input type="radio">
</div>
</form>
This worked for me, I'm leaving it here in case it helps anyone.
<div class="genero">
<input type="radio" name="radiogroup" oninvalid="setCustomValidity('Mensaje')" onchange="try{setCustomValidity('')}catch(e){}" value="M">Masculino
<input type="radio" name="radiogroup" oninvalid="setCustomValidity('Mensaje')" onchange="try{setCustomValidity('')}catch(e){}" value="F">Femenino
</div>
How can I prevent a user from selecting multiple checkboxes in HTML?
you should change it to radio button instead of check box!
<input type="radio" name="group1" id="item1" value="Milk">
<label for="item1">Milk</label>
<br/>
<input type="radio" name="group1" id="item2" value="Butter" checked>
<label for="item2">Butter</label>
<br/>
<input type="radio" name="group1" id="item3" value="Cheese">
<label for="item13">Cheese</label>
I had a use case where I needed use checkboxes--which, unlike radio buttons, allows a user to UNcheck... Here's an example of something I pieced together from another stackoverflow user:
<head>
<meta charset=utf-8 />
<title>and-or checkboxes</title>
<script src="http://code.jquery.com/jquery-1.4.4.js"></script>
</head>
<body>
<label for="checkbox1"><input type="checkbox" id="checkbox1" name="checkbox1" value="and" </label><span id="span_and">checkbox1</span><br>
<label for="checkbox2"> <input type="checkbox" id="checkbox2" name="checkbox2" value="or" </label><span id="span_or">checkbox2</span>
<script>
$(document).ready(function(){
$('#checkbox1').click(function() {
var checkedBox = $(this).attr("checked");
if (checkedBox === true) {
$("#checkbox2").attr('checked', false);
} else {
$("#checkbox2").removeAttr('checked');
}
});
});
$(document).ready(function(){
$('#checkbox2').click(function() {
var checkedBox = $(this).attr("checked");
if (checkedBox === true) {
$("#checkbox1").attr('checked', false);
} else {
$("#checkbox1").removeAttr('checked');
}
});
});
</script>
</body>
With a little work, you can combine the either/or two scripts into a single script. You probably don't need this now but I wanted to post it because it was very useful to me.
If you want that only one checkbox get selected at a time then its better to use radiobutton instead.
If you mean that you don't want multiple checkboxes from a same "logical group" to be checked at one time, you should use radio buttons instead of checkboxes.
<form>
<input type="radio" name="aGroup" value="choice1" /> Choice #1<br />
<input type="radio" name="aGroup" value="choice2" /> Choice #2
</form>
By using this, only 1 option can be checked at one time
Use Radio, and they must have the same name="".