Html hidden true false

hidden

The hidden global attribute is an enumerated attribute indicating that the browser should not render the contents of the element. For example, it can be used to hide elements of the page that can’t be used until the login process has been completed.

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Description

The hidden attribute is used to indicate that the content of an element should not be presented to the user. This attribute can take any one of the following values:

There are two states associated with the hidden attribute: the hidden state and the hidden until found state.

• An empty string, or the keyword hidden , set the element to the hidden state. Additionally, invalid values set the element to the hidden state.
• The keyword until-found sets the element to the hidden until found state.

Thus, all the following set the element to the hidden state:

span hidden>I'm hiddenspan> span hidden="hidden">I'm also hiddenspan> span hidden="something else">I'm hidden too!span> 

The following sets the element to the hidden until found state:

span hidden="until-found">I'm hidden until foundspan> 

The hidden attribute must not be used to hide content just from one presentation. If something is marked hidden, it is hidden from all presentations, including, for instance, screen readers.

Hidden elements shouldn’t be linked from non-hidden elements. For example, it would be incorrect to use the href attribute to link to a section marked with the hidden attribute. If the content is not applicable or relevant, then there is no reason to link to it.

It would be fine, however, to use the ARIA aria-describedby attribute to refer to descriptions that are themselves hidden. While hiding the descriptions implies that they are not useful on their own, they could be written in such a way that they are useful in the specific context of being referenced from the element that they describe.

Similarly, a canvas element with the hidden attribute could be used by a scripted graphics engine as an off-screen buffer, and a form control could refer to a hidden form element using its form attribute.

Elements that are descendants of a hidden element are still active, which means that script elements can still execute and form elements can still submit.

The hidden state

The hidden state indicates that the element is not currently relevant to the page, or that it is being used to declare content for reuse by other parts of the page and should not be directly presented to the user. The browser will not render elements that are in the hidden state.

Web browsers may implement the hidden state using display: none , in which case the element will not participate in page layout. This also means that changing the value of the CSS display property on an element in the hidden state will override the state. For instance, elements styled display: block will be displayed despite the hidden attribute’s presence.

The hidden until found state

In the hidden until found state, the element is hidden but its content will be accessible to the browser’s «find in page» feature or to fragment navigation. When these features cause a scroll to an element in a hidden until found subtree, the browser will:

• fire a beforematch event on the hidden element
• remove the hidden attribute from the element
• scroll to the element

This enables a developer to collapse a section of content, but make it searchable and accessible via fragment navigation.

Note that browsers typically implement hidden until found using content-visibility: hidden . This means that unlike elements in the hidden state, elements in the hidden until found state will have generated boxes, meaning that:

• the element will participate in page layout
• margin, borders, padding, and background for the element will be rendered.

Also, the element needs to be affected by layout containment in order to be revealed. This means that if the element in the hidden until found state has a display value of none , contents , or inline , then the element will not be revealed by find in page or fragment navigation.

Examples

Using until-found

The hidden until found element has a dotted red border and a gray background.

We also have some JavaScript that listens for the beforematch event firing on the hidden until found element. The event handler changes the text content of the box.

HTML

a href="#until-found-box">Go to hidden contenta> div>I'm not hiddendiv> div id="until-found-box" hidden="until-found">Hidden until founddiv> div>I'm not hiddendiv> 

button id="reset">Resetbutton> 

CSS

div  height: 40px; width: 300px; border: 5px dashed black; margin: 1rem 0; padding: 1rem; font-size: 2rem; > div#until-found-box  color: red; border: 5px dotted red; background-color: lightgray; > 

#until-found-box  scroll-margin-top: 200px; > 

JavaScript

const untilFound = document.querySelector("#until-found-box"); untilFound.addEventListener( "beforematch", () => (untilFound.textContent = "I've been revealed!"), ); 

.querySelector("#reset").addEventListener("click", () =>  document.location.hash = ""; document.location.reload(); >); 

Result

Note that although the content of the element is hidden, the element still has a generated box, occupying space in the layout and with background and borders rendered.

Clicking the «Go to hidden content» button navigates to the hidden until found element. The beforematch event fires, the text content is updated, and the element content is displayed.

To run the example again, click «Reset».

Specifications

Browser compatibility

BCD tables only load in the browser

See also

Found a content problem with this page?

This page was last modified on Jul 17, 2023 by MDN contributors.

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.hidden

Свойство hidden у DOM-элементов позволяет узнать или изменить значение HTML-атрибута hidden .

Время чтения: меньше 5 мин

Обновлено 26 октября 2022

Кратко

Скопировать ссылку «Кратко» Скопировано

Свойство hidden позволяет узнать значение HTML-атрибута hidden или изменить его. Когда hidden равен true , элемент скрыт на странице и недоступен для скринридеров.

Как пишется

Скопировать ссылку «Как пишется» Скопировано

Обращение к свойству hidden вернёт текущее значение HTML-атрибута hidden . Если атрибута нет на элементе, результат будет false :

   input type="text" placeholder="Введите почту"> div class="error" hidden>Неправильная почтаdiv>    Скопировать Скопировано Не удалось скопировать   

 const input = document.querySelector('input')const div = document.querySelector('div') console.log(input.hidden)// falseconsole.log(div.hidden)// true const input = document.querySelector('input') const div = document.querySelector('div') console.log(input.hidden) // false console.log(div.hidden) // true    Скопировать Скопировано Не удалось скопировать   

Присвоение значения в hidden изменит значение атрибута. В зависимости от значения элемент скроется или появится. Скроем поле ввода из примера выше:

 input.hidden = true input.hidden = true    Скопировать Скопировано Не удалось скопировать   

В результате у поля ввода появится атрибут hidden и элемент скроется:

  input type="email" placeholder="email@example.com" hidden>    Скопировать Скопировано Не удалось скопировать   

 input.hidden = false input.hidden = false    Скопировать Скопировано Не удалось скопировать   

isHidden = HTMLElement.hidden; HTMLElement.hidden = true | false;

.getElementById("okButton") .addEventListener("click", function()  document.getElementById("welcome").hidden = true; document.getElementById("awesome").hidden = false; >, false); 

Этот код устанавливает обработчика для кнопки "OK", которая скрывает панель приветствия и делает The follow-up panel панель с необычным именем "awesome" - видимой в этом месте.

HTML

HTML-код для двух boxes показанных здесь.

Welcome panel

div id="welcome" class="panel"> h1>Welcome to Foobar.com!h1> p>By clicking "OK" you agree to be awesome every day!p> button class="button" id="okButton">OKbutton> div> 

Этот HTML создаёт панель, которая приветствует пользователей на сайте и рассказывает им о том с чем они соглашаются нажимая на кнопку OK.

The follow-up panel

После того, как пользователь нажимает OK в welcome panel, JavaScript-код меняет две панели изменяя их значения hidden. Следующая The follow-up panel представлена в этом HMTL:

div id="awesome" class="panel" hidden> h1>Thanks!h1> p>Thank you strong>sostrong> much for agreeing to be awesome today! Now get out there and do awesome things awesomely to make the world more awesome!p> div> 

CSS

Стилизованное содержимое использует CSS представленное внизу.

.panel  font: 16px "Open Sans", Helvetica, Arial, sans-serif; border: 1px solid #22d; padding: 12px; width: 500px; text-align: center; > .button  font: 22px "Open Sans", Helvetica, Arial, sans-serif; padding: 5px 36px; > h1  margin-top: 0; font-size: 175%; > 

Результат

Технические требования

Браузерная совместимость

BCD tables only load in the browser

Смотрите также

Found a content problem with this page?

This page was last modified on 7 нояб. 2022 г. by MDN contributors.

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MDN

Support

Our communities

Developers

Visit Mozilla Corporation’s not-for-profit parent, the Mozilla Foundation.
Portions of this content are ©1998– 2023 by individual mozilla.org contributors. Content available under a Creative Commons license.

Источник