On form submission, how could you possibly mark a checkbox/radiobutton as required?
Source of inspiration: Pekka's answer to a question
Required checkboxes are not unusual. Practically every registration form uses some form of the "I have read and accept the User Agreement" checkbox.
If you have Opera handy try out the code below. The form won't submit unless the checkbox is checked.
<!doctype html>
<html>
<head>
<title>html5</title>
</head>
<body>
<h1>html5 test</h1>
<form action="/">
<input type="checkbox" required="required" id="cb" name="cb">
<label for="cb">required checkbox</label>
<input type="submit">
</form>
</body>
</html>
For checkboxes, the best way is probably to pre-select it and set it to disabled. Just kidding.
To ensure one radio button in a group has been selected, either start with a default choice or validate using javascript. There are no HTML-ways to do that because every possible selection is valid.
In html5 there is a required attribute for checkboxes.
They are somehow weird, so let me quote something to explain how they work.
For checkboxes, the required attribute shall only be satisfied when one or more of the checkboxes with that name in that form are checked.
For radio buttons, the required attribute shall only be satisfied when exactly one of the radio buttons in that radio group is checked.
Of course you always have to validate server side because the client can always send you whatever he desires. Just use these methods for better user experience.
I tested required attribute for Radio Buttons today on Firefox 17.0.1 on XP SP2.
It seems to comply with the specification of required attribute for radio buttons/groups. As Firefox prompts "Please select one of these options." for both of the code snippets below:
Either you set required attribute for each of the radio buttons
<input type="radio" name="gender" value="male" required="required" />
<input type="radio" name="gender" value="female" required="required" />
Or Any One of the Radio elements
<input type="radio" name="color" value="blue" />
<input type="radio" name="color" value="red" required="required" />
<input type="radio" name="color" value="green" />
Any comments and updates are welcome.
I just tried it on a radio button in Firefox 4. Adding required to one radio input, then submitting before selecting one, triggers a "Please select one of these options" tooltip.
E.g. this works:
<input type="radio" name="gender" value="m" required />
<input type="radio" name="gender" value="f" />
Related
Okay so I'm working on a project for my computer class and we're using radio buttons within a form. Part of the requirements are to ensure that when the submit button is clicked it is not left blank and that only one radio button is clicked.
Whenever I have worked with radio buttons it only allows you to click one, so I was confused by the requirement. I even went to W3 Schools HTML Forms Input Types and confirmed that only one radio box can be selected at a time.
After contacting my TA though he sent me the following code which allows multiple radio buttons to be selected. Any clarification about why the following code allows multiple radio buttons to be selected and if my knowledge on radio buttons is correct would be wonderful. Thanks in advance.
<html>
<head>
<META http-equiv="Content-Type" content="text/html; charset=utf-8"></head>
<body>
<div>
<form target="_blank" onsubmit="try {return window.confirm("You are submitting information to an external page.\nAre you sure?");} catch (e) {return false;}">
<input type="radio"> one<br>
<input type="radio"> two<br>
<input type="radio"> three<br>
</form>
</div>
</body>
</html>
JSFiddle
you have to put them in a group.You can do it like this
<form action="">
<input type="radio" name="gender" checked> Male<br>
<input type="radio" name="gender" > Female<br>
<input type="radio" name="gender" > Other
</form>
if you use the same name it's consider as a group. name="gender" like this.
The inputs do not have the name attribute set, therefore they are not grouped
As you can see here, the radio buttons only allow one selection when named:
<div>
<form target="_blank" onsubmit="try {return window.confirm("You are submitting information to an external page.\nAre you sure?");} catch (e) {return false;}">
<input name="group_name" type="radio"> one<br>
<input name="group_name" type="radio"> two<br>
<input name="group_name" type="radio"> three<br>
</form>
</div>
jsfiddle
That being said, I don't know why you are being told to use radio buttons for multiple selections. They are most definitely not intended for that
This happens because you need to provide same name attribute when input type is radio:
<form method="post" action="">
<input type="radio" name="radio">one
<br>
<input type="radio" name="radio">Two
<br>
<input type="radio" name="radio">Three
<br>
</form>
Radio buttons need to be part of a group for a maximum of one to be selected. The group is denoted with the name attribute. All radio buttons in a group should have the same name.
Here's your updated fiddle: https://jsfiddle.net/8fn0hfoh/1/
Radio buttons needs to share the same name attribute to behave like that.
To put in other words only one radio button with the same name could be checked at once.
As said by MDN
radio: A radio button. You must use the value attribute to define the value submitted by this item. Use the checked attribute to indicate whether this item is selected by default. Radio buttons that have the same value for the name attribute are in the same "radio button group"; only one radio button in a group can be selected at a time.
Here is your code adjusted to behave like that.
<html>
<head>
<META http-equiv="Content-Type" content="text/html; charset=utf-8"></head>
<body>
<div>
<form target="_blank" onsubmit="try {return window.confirm("You are submitting information to an external page.\nAre you sure?");} catch (e) {return false;}">
<input type="radio" name="field"> one<br>
<input type="radio" name="field"> two<br>
<input type="radio" name="field"> three<br>
</form>
</div>
</body>
</html>
So its up to you what approach do you wanna use.
I have the following form, where users can choose to enter either the ID or the name:
<label for="ID"><input type="radio" name="Member" id="ID"> Member ID <input id="MemberID"></label><br/>
<label for="Name"><input type="radio" name="Member" id="Name"> Last Name <input id="LastName"></label>
When I click on "Member ID or Last Name, this switches the radio buttons. However when I click on the text inputs, this has no effect on the radio buttons.
Is this the expected behavior? If so, is there any way to tweak the html to make it work?
Note: this is not a JavaScript question.
Fiddle: https://jsfiddle.net/3by5wqzw/
Yes, this seems to be the expected behaviour on chrome, microsoft edge and firefox on windows 10 and on chrome for android lollipop.
You can use a bit of javascript to solve the problem:
<label for="ID"><input type="radio" name="Member" id="ID"> Member ID <input id="MemberID" onclick="document.getElementById('ID').checked = true;"></label><br/>
<label for="Name"><input type="radio" name="Member" id="Name"> Last Name <input id="LastName" onclick="document.getElementById('Name').checked = true;"></label>
When you click on a text input, the client will automatically check the matching radio button looking it up by its id.
As an alternative, you could put the Javascript code in a function, so it looks better and is easier to edit if you have lots of radio buttons with text input associated with it:
function check_radio(element_id){
document.getElementById(element_id).checked = true;
}
<label for="ID"><input type="radio" name="Member" id="ID"> Member ID <input id="MemberID" onclick="check_radio('ID');"></label><br/>
<label for="Name"><input type="radio" name="Member" id="Name"> Last Name <input id="LastName" onclick="check_radio('Name');"></label>
In regular html, radio input types are not related to anything other than the label associated with it. Therefore any other input text fields before or after need to be hooked up via some sort of javascript.
I think I found the answer.
The w3 recommendation states:
In an HTML document, an element must receive focus from the user in order to become active and perform its tasks
The issue is that when the user clicks on the text input, the radio button loses focus and is not activated.
Source (html4): http://www.w3.org/TR/html4/interact/forms.html#focus
Good day, before we start, forgive the noobishness of the question. Just picked up HTML today.
I'm experimenting with the following code:
<form>
<input type="radio" id="radeng" checked />Male
<br/>
<input type="radio" id="radnor" />Female
</form>
Now, the way I understood it, I should be able to pick either "Male" or "Female" from the first selection.
Problem is, I can select both "Male" AND "Female".
Which is a little weird, and kinda' goes against what I'm trying to achieve.
Can anyone spot my error?
17 Forms / 17.2.1 Control types
Radio buttons are like checkboxes except that when several share the same control name, they are mutually exclusive: when one is switched "on", all others with the same name are switched "off".
Therefore if you want the radio elements to be mutually exclusive, you need to give them all the same name attribute. In this case, I gave them both a value of gender.
For usability, I'd also suggest wrapping the text nodes with label elements with for attributes that match the radio element ids. In doing so, you can toggle the radios by clicking the text (label).
<form>
<label for="radeng">Male</label>
<input type="radio" name="gender" id="radeng" checked />
<label for="radnor">Female</label>
<input type="radio" name="gender" id="radnor" />
</form>
You need to provide a name attribute with the same value and it will select only one. Also, you should use <label> tag for specifying the names of your checkboxes.
Lets have some clean markup :
<ul>
<li>
<label for="radeng">Male</label>
<input type="radio" id="radeng" name="gender" checked />
</li>
<li>
<label for="radnor">Female</label>
<input type="radio" id="radnor" name="gender" />
</li>
</ul>
Demo
So by specifying same values for name attribute groups your radio buttons.
Give same name for the both radio button like below:
<form>
<input type="radio" name="gender" id="radeng" checked />Male
<br/>
<input type="radio" name="gender" id="radnor" />Female
</form>
I am trying to design a web form where I run into a strange issue.
I set 3 radio buttons, but I can select only the first one no matter what radio button I click. I tried to open the HTML page on different browsers other than Firefox and it was okay. I also tried another web form that has a radio buttons with Firefox and it was okay. I could not figure out what why Firefox cant select the other radio buttons in from my form HTML page.
Here is the code:
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html><head>
<title>m</title></head><body>
<from method="post" action="self">
<label> <span>Gender :</span>
<br>
<input name="gender" value="1" type="radio">Male
<br>
<input name="gender" value="2" type="radio">Female
<br>
<input name="gender" value="3" type="radio">N/A
<br>
</label>
</from>
</body></html>
Don't use multiple inputs inside label. I think in this case it will select only the first input on matter where you click on label.
<form method="post" action="self"> <span>Gender :</span>
<br>
<input name="gender" value="1" type="radio"/>Male
<br>
<input name="gender" value="2" type="radio"/>Female
<br>
<input name="gender" value="3" type="radio"/>N/A
<br>
</form>
As #K K said, it's caused by multiple inputs inside a label tag.
We had a similar issue. I think what happens here is the event triggers at one of the <input>s, and then bubbles up to the parent <label>. Labels are bound to an input inside them, and I guess multiple inputs cause it to default to the first one. So it triggers an event on whatever one you click, then bubbles to the parent <label> and triggers again there, which is bound to the first input. Our case was with checkbox inputs, and it would set both boxes when the second one was checked. In Firefox. Not sure why Chrome behaves differently.
Example with checkboxes:
http://codepen.io/anon/pen/IjboB
Looked at the HTML spec, but couldn't make heads or tails of it: http://www.w3.org/TR/html5/the-input-element.html#attr-input-checked
What is the correct way to check a checkbox in HTML (not dynamically)?
checked="true"
checked="checked"
What is the correct way to uncheck a checkbox?
<input type="checkbox" /> with no checked attribute
checked="false"
checked="none"
Where to check the HTML specification to check/uncheck a checkbox?
For checked state
Older browsers may need:
<input type="checkbox" checked="checked" />
But nowadays simply do:
<input type="checkbox" checked />
For unchecked state
Remove checked attribute, like:
<input type="checkbox" />
Reference: http://www.w3.org/TR/html-markup/input.checkbox.html#input.checkbox.attrs.checked
According to HTML5 drafts, the checked attribute is a “boolean attribute”, and “The presence of a boolean attribute on an element represents the true value, and the absence of the attribute represents the false value.” It is the name of the attribute that matters, and suffices. Thus, to make a checkbox initially checked, you use
<input type=checkbox checked>
By default, in the absence of the checked attribute, a checkbox is initially unchecked:
<input type=checkbox>
Keeping things this way keeps them simple, but if you need to conform to XML syntax (i.e. to use HTML5 in XHTML linearization), you cannot use an attribute name alone. Then the allowed (as per HTML5 drafts) values are the empty string and the string checked, case insensitively. Example:
<input type="checkbox" checked="checked" />
<input type="checkbox" checked />
HTML5 does not require attributes to have values
In jQuery:
To check the checkbox:
$("#checkboxid").attr("checked","checked");
To uncheck the checkbox:
$("#checkboxid").removeAttr("checked");
The other answers hint at the solution and point you to documentation that after further digging will get you to this answer. Jukka K. Korpela has the reason this is the correct answer, basically I followed his link and then looked up the jQuery docs to get to that result. Just figured I'd save future people who find this article those extra steps.
you can use autocomplete="off" on parent form, so if you reload your page, checkboxes will not be checked automatically
Complementary answer to Robert's answer http://jsfiddle.net/ak9Sb/ in jQuery
When getting/setting checkbox state, one may encounter these phenomenons:
.trigger("click");
Does check an unchecked checkbox, but do not add the checked attribute.
If you use triggers, do not try to get the state with "checked" attribute.
.attr("checked", "");
Does not uncheck the checkbox...
I'm not entirely sure why this hasn't been mentioned before, but for me, the following works:
To set it to checked:
<input type="checkbox" checked>
To set it to unchecked:
<input type="checkbox" unchecked>
(I was having the problem that checkboxes remained checked after reloading the page. Using unchecked solved my problem, so it might be useful to someone else.)
You can refer to this page at w3schools but basically you could use any of:
<input checked>
<input checked="checked">
<input checked="">
<form name="myForm" method="post">
<p>Activity</p>
skiing: <input type="checkbox" name="activity" value="skiing" checked="yes" /><br />
skating: <input type="checkbox" name="activity" value="skating" /><br />
running: <input type="checkbox" name="activity" value="running" /><br />
hiking: <input type="checkbox" name="activity" value="hiking" checked="yes" />
</form>