I want to uncheck my Checkbox with Javascript, but it didn't work. And then I tried to set the checked property to false directly in HTML, but not even that worked: (I tried checked="false" too...)
My HTML:
<input type="checkbox" id="dateCheckbox" checked=false >
<label for="dateCheckbox"> Keinen Zeitraum angeben</label>
Result:
Why is it still checked?
HTML5 does not use true or false for boolean attributes. Boolean attributes are true by specifying the attribute name alone, and a false value is the omission of the attribute.
(For XHTML5, you provide the attribute-name as the value in order to conform to XML's rules for attributes):
So for an unchecked checkbox, change this:
<input type="checkbox" id="dateCheckbox" checked=false >
To this (HTML5 and XHTML5):
<input type="checkbox" id="dateCheckbox">
For a checked checkbox, change this:
<input type="checkbox" id="dateCheckbox" checked=true >
To this (HTML5):
<input type="checkbox" id="dateCheckbox" checked>
or this (XHTML5):
<input type="checkbox" id="dateCheckbox" checked="checked" />
Setting checked attribute to false won't work.
If checked attribute is present on the input element, it doesn't matters what boolean value you give it, input element will always be checked. To make the input element unchecked, you have to remove the checked attribute.
To uncheck the checkbox input element via javascript, you can remove the checked attribute using removeAttribute() method.
Following code snippet unchecks the checkbox after 2 seconds via javascript.
const checkInput = document.querySelector('#dateCheckbox');
setTimeout(() => {
checkInput.removeAttribute('checked');
}, 2000);
<input type="checkbox" id="dateCheckbox" checked>
<label for="dateCheckbox"> Keinen Zeitraum angeben</label>
Checkbox work this way.
<input type="checkbox" id="dateCheckbox" checked>
<label for="dateCheckbox"> Keinen Zeitraum angeben</label>
<br />
<input type="checkbox" id="dateCheckbox">
<label for="dateCheckbox"> Keinen Zeitraum angeben</label>
It actuially doesn't matter if u have anything in checked only it existense does
For example,
<input type="checkbox" id="dateCheckbox" checked>
<label for="dateCheckbox"> Keinen Zeitraum angeben</label>
But, omitting checked works as expected,
<input type="checkbox" id="dateCheckbox">
<label for="dateCheckbox"> Keinen Zeitraum angeben</label>
Checkout https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input/checkbox
Unfortunaly, checked is no a boolean value (true or false). If the checked attribute is present in the <input type="checkbox"> tag it will be checked, no matter what you set as value.
If you leave it out, it will work accordingly, because checked is not present.
You need remove "checked" attribute to make checkbox uncheck. checked=false|true has no meaning, same as "selected" in select's options
Related
If i'm using radio buttons in HTML and would like a default option to show as selected, I've used the 'checked' attribute to achieves this. How do I make it so when I check on another option on the radio buttons this default option is removed. In the code below, when you check another option, the original option remains and you can't uncheck anything?
In the option below the fish option is the one with the 'checked' attribute added.
https://codepen.io/pen/?editors=1010
HTML
<input type="radio" id="dog"name="dog"value="dog"><label for="dog">Dog</label>
<input type="radio" id="cat" name="cat" value="cat"><label for="cat">Cat</label>
<input type="radio" id="fish" name="fish" value="fish" checked><label for="fish">Fish</label>
<input type="submit">
Your form radio elements need to have a shared name attribute as they
are the options for one choice. change name to "foo" or "animal" and
it will work.
<div style="margin-bottom:15px;">All radio inputs require a shared name attribute, I declared it "choice"</div>
<form style="text-align:center">
<input type="radio" id="dog"name="choice"value="dog"><label for="dog">Dog</label>
<input type="radio" id="cat" name="choice" value="cat" ><label for="cat" >Cat</label>
<input type="radio" id="fish" name="choice" value="fish" checked="checked" ><label for="fish" >Fish</label>
<input type="submit">
</form>
I have used radio button for gender as follow:-
<td><input type="radio" name="gender" value="male" checked required="required"> Male<br>
<input type="radio" name="gender" value="female"> Female<br>
<input type="radio" name="gender" value="other"> Other</td>
but this "required" validation is not working how to put validation on it without using JavaScript.
Required is a HTML5 attribute for input control validation, you can add the required attribute at end of tag and if you want Gender radio button checked by default, you can add checked.
This would checked the radio button default when page loads,
<input type="radio" name="gender" value="male" checked required/> Male
This will work, so we no need to go for JS validation.
You can set default value to radio button like this :
<input type="radio" name="gender" value="male" checked="checked" />
then you have not need to validation...
The required attribute is an HTML5 attribute and if you're using an older browser it may not support it.
http://www.w3schools.com/html/html_form_attributes.asp
Also, you simply put "required", not "required="required"", just like with "checked"
Please see this reference and try it yourself
http://www.chennaisunday.com/jsradio.html
Checkbox's value disappear When I inspect element, I didn't see a value of my checkbox.
This is my code
<input type="checkbox" id="test" name="test" value="hello">
and when I inspect element I get this
<input type="checkbox" id="test" name="test" value="">
(I don't know any jquery files kill it or not)
In order to detect if you check-box has been checked you should use some JavaScript, below an example.
Regarding your value on the checkbox if you do not have any other code changing value, the value will remain on your HTML.
https://jsfiddle.net/d94w84q9/
<input type="checkbox" id="test" name="test" value="hello" checked>
var value = document.getElementById('test').checked;
alert(value)
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>
We all know how to form a checkbox input in HTML:
<input name="checkbox_name" id="checkbox_id" type="checkbox">
What I don't know -- what's the technically correct value for a checked checkbox? I've seen these all work:
<input name="checkbox_name" id="checkbox_id" type="checkbox" checked>
<input name="checkbox_name" id="checkbox_id" type="checkbox" checked="on">
<input name="checkbox_name" id="checkbox_id" type="checkbox" checked="yes">
<input name="checkbox_name" id="checkbox_id" type="checkbox" checked="checked">
<input name="checkbox_name" id="checkbox_id" type="checkbox" checked="true">
Is the answer that it doesn't matter? I see no evidence for the answer marked as correct here from the spec itself:
Checkboxes (and radio buttons) are on/off switches that may be toggled
by the user. A switch is "on" when the control element's checked
attribute is set. When a form is submitted, only "on" checkbox
controls can become successful. Several checkboxes in a form may share
the same control name. Thus, for example, checkboxes allow users to
select several values for the same property. The INPUT element is used
to create a checkbox control.
What would a spec writer say is the correct answer? Please provide evidence-based answers.
Strictly speaking, you should put something that makes sense - according to the spec here, the most correct version is:
<input name=name id=id type=checkbox checked=checked>
For HTML, you can also use the empty attribute syntax, checked="", or even simply checked (for stricter XHTML, this is not supported).
Effectively, however, most browsers will support just about any value between the quotes. All of the following will be checked:
<input name=name id=id type=checkbox checked>
<input name=name id=id type=checkbox checked="">
<input name=name id=id type=checkbox checked="yes">
<input name=name id=id type=checkbox checked="blue">
<input name=name id=id type=checkbox checked="false">
And only the following will be unchecked:
<input name=name id=id type=checkbox>
See also this similar question on disabled="disabled".
HTML5 spec:
http://www.w3.org/TR/html5/forms.html#attr-input-checked :
The disabled content attribute is a boolean attribute.
http://www.w3.org/TR/html5/infrastructure.html#boolean-attributes :
The presence of a boolean attribute on an element represents the true value, and the absence of the attribute represents the false value.
If the attribute is present, its value must either be the empty string or a value that is an ASCII case-insensitive match for the attribute's canonical name, with no leading or trailing whitespace.
Conclusion:
The following are valid, equivalent and true:
<input type="checkbox" checked />
<input type="checkbox" checked="" />
<input type="checkbox" checked="checked" />
<input type="checkbox" checked="ChEcKeD" />
The following are invalid:
<input type="checkbox" checked="0" />
<input type="checkbox" checked="1" />
<input type="checkbox" checked="false" />
<input type="checkbox" checked="true" />
The absence of the attribute is the only valid syntax for false:
<input />
Recommendation
If you care about writing valid XHTML, use checked="checked", since <input checked> is invalid XHTML (but valid HTML) and other alternatives are less readable. Else, just use <input checked> as it is shorter.
<input ... checked />
<input ... checked="checked" />
Those are equally valid. And in JavaScript:
input.checked = true;
input.setAttribute("checked");
input.setAttribute("checked","checked");
you want this i think:
checked='checked'
checked
checked=""
checked="checked"
are equivalent;
according to spec checkbox
'----ⓘ checked = "checked" or "" (empty string) or empty
Specifies that the element represents a selected control.---'
It's pretty crazy town that the only way to make checked false is to omit any values. With Angular 1.x, you can do this:
<input type="radio" ng-checked="false">
which is a lot more sane, if you need to make it unchecked.
I think this may help:
First read all the specs from Microsoft and W3.org.
You'd see that the setting the actual element of a checkbox needs to be done on the ELEMENT PROPERTY, not the UI or attribute.
$('mycheckbox')[0].checked
Secondly, you need to be aware that the checked attribute RETURNS a string "true", "false"Why is this important? Because you need to use the correct Type. A string, not a boolean. This also important when parsing your checkbox.
$('mycheckbox')[0].checked = "true"
if($('mycheckbox')[0].checked === "true"){
//do something
}
You also need to realize that the "checked" ATTRIBUTE is for setting the value of the checkbox initially. This doesn't do much once the element is rendered to the DOM. Picture this working when the webpage loads and is initially parsed.
I'll go with IE's preference on this one: <input type="checkbox" checked="checked"/>
Lastly, the main aspect of confusion for a checkbox is that the checkbox UI element is not the same as the element's property value. They do not correlate directly.
If you work in .net, you'll discover that the user "checking" a checkbox never reflects the actual bool value passed to the controller.
To set the UI, I use both $('mycheckbox').val(true); and $('mycheckbox').attr('checked', 'checked');
In short, for a checked checkbox you need:
Initial DOM: <input type="checkbox" checked="checked">
Element Property: $('mycheckbox')[0].checked = "true";
UI: $('mycheckbox').val(true); and $('mycheckbox').attr('checked', 'checked');
Just like all input's, this one also has a 'value' attribute. If you set the value attribute along with the name attribute, it will send ${name}=${value} in the headers. Let's say we had a form with a bunch of stuff and we wanted the user to decide what roles they have, we could use a checkbox. The easiest way is to set the 'value' attribute which will be passed along to the server. Like this:
<form action="/server" method="post">
<label>Are you a person?</label>
<input type="checkbox" name="my_checkbox" value="is_person">
</form>
The server will receive the following:
my_checkbox=is_person
but only if the checkbox is checked. This would be
my_checkbox=
if it is empty.
This is the exact same with radio inputs.
But.. I have a feeling this isn't what you're asking for... So just encase I'll write another answer below:
If the checked attribute is set to anything (even false) it will be activated, no matter what. The checked attribute doesn't have a specified value, if it's set to anything it will default to 'true' (even if you set it to false).
For example:
<form action="/server" method="post">
<label>Are you a person?</label>
<input type="checkbox" checked="false"> <!--Still checked-->
</form>
Will be checked even though it's set to false.
<form action="/server" method="post">
<label>Are you a person?</label>
<input type="checkbox" checked="asjdiasjiasdjoasi"> <!--Still checked-->
</form>
Doing this will also check it. It doesn't matter -- as long as it's set it will be checked.
Hope this answers your question, the checked attribute will check the input no matter the value of the attribute.
You can test it here: https://battledash-2.github.io/Live-IDE/
or anywhere like repl.it, or locally.
The technically correct value for a checked checkbox is zero (0), and when the checkbox is not checked, it's index is not defined.
Well, to use it i dont think matters (similar to disabled and readonly), personally i use checked="checked" but if you are trying to manipulate them with JavaScript, you use true/false