c:out Tag Example

JSP : JSTL’s tag

c:out escapes HTML characters so that you can avoid cross-site scripting.

the script will be executed in the second case, but not when using c:out

N.B. it escapes XML not HTML. One of the more annoying subtleties of JSTL. I end up always writing my own HTML escape EL fn.

I have no idea what this answer’s code sample is showing- can someone clarify? It mentions a «second case» but I don’t see that and I don’t see c:out being used in the code.

As said Will Wagner, in old version of jsp you should always use c:out to output dynamic text.

Moreover, using this syntax:

you can display the text «No name» when name is null.

@Barett. Cool. I wonder why this never makes any of the tutorials or examples. A more convenient syntax than the default attribute IMO.

c:out also has an attribute for assigning a default value if the value of person.name happens to be null.

You can explicitly enable escaping of Xml entities by using an attribute escapeXml value equals to true. FYI, it’s by default «true».

Older versions of JSP did not support the second syntax.

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: The Output element

The HTML element is a container element into which a site or app can inject the results of a calculation or the outcome of a user action.

Attributes

This element includes the global attributes.

A space-separated list of other elements’ id s, indicating that those elements contributed input values to (or otherwise affected) the calculation.

The element to associate the output with (its form owner). The value of this attribute must be the id of a in the same document. (If this attribute is not set, the is associated with its ancestor element, if any.)

This attribute lets you associate elements to s anywhere in the document, not just inside a . It can also override an ancestor element.

The element’s name. Used in the form.elements API.

The value, name, and contents are NOT submitted during form submission.

Examples

form oninput="result.value=parseInt(a.value)+parseInt(b.value)"> input type="range" id="b" name="b" value="50" /> + input type="number" id="a" name="a" value="10" /> = output name="result" for="a b">60output> form> 

Result

Accessibility Concerns

Many browsers implement this element as an aria-live region. Assistive technology will thereby announce the results of UI interactions posted inside it without requiring that focus is switched away from the controls that produce those results.

Technical summary

Content categories	Flow content, phrasing content, listed, labelable, resettable form-associated element, palpable content.
Permitted content	Phrasing content.
Tag omission	None, both the starting and ending tag are mandatory.
Permitted parents	Any element that accepts phrasing content.
Implicit ARIA role	status
Permitted ARIA roles	Any
DOM interface	HTMLOutputElement

Specifications

Browser compatibility

BCD tables only load in the browser

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JSTL Core Tag

is a JSTL core tag, which is used for displaying server-side variables and hardcoded values on the browser (client). You may be wondering that a variable’s value and data can be displayed using Expression language(EL) and out implicit object too then why do we need jstl tag? the difference is that the tag escapes HTML/XML tags but others don’t, refer the example to understand this.

Tag Example

In this example we are displaying a string on the browser, however we are using html tags in the value and we want to see what would be the result and how it is gonna HTML tags.

     This is a example '>"/> 

Output:
This is a example

escapeXml attribute of tag

Let’s say I modify the above code like this – I have just added escapeXML attribute in the tag and marked it false. By default the value of escapeXML attribute is true. Since we have marked it as false it would not escape HTML/XML tags and the tags will work.

This is a example '>" escapeXml="false"/>

Attribute “default” of tag

Above we have seen escapeXML attribute of the tag. There is another attribute “default” for this tag, which is used to display the fallback or default value in case the value of the tag is null. Here is the example where we are trying to print the value of string str using the tag and since the string str value is null, the tag is printing the value set in default attribute.

 " default="default value of c:out"/>

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Html с out tag

Тег используется для отображения результатов вычислений или действий пользователя на веб-странице. Обычно он используется в сочетании с формой и JavaScript для выполнения вычислений и отображения результатов на странице.

Атрибуты тега :

• for — идентификаторы одного или нескольких элементов, с которыми связан элемент .
• form — идентификатор формы, к которой принадлежит элемент .
• name — имя элемента .

Примеры использования

Отображение пользовательского ввода:

Для чего использовать тег

• чтобы отобразить результат вычисления на веб-странице;
• чтобы показать пользователю результат поискового запроса или операции фильтрации;
• для отображения результата игры или викторины;
• чтобы показать пользователю результат онлайн-викторины;
• для отображения результата ввода или выбора пользователя.

Глобальные атрибуты

Ограничения

• Тег не следует использовать для представления результата вычисления, критически важного для функционирования веб-страницы, поскольку результат может быть отредактирован пользователем.
• Тег не поддерживается в Internet Explorer.

Нюансы

• Если используется атрибут for , атрибут id связанного элемента (элементов) должен быть уникальным на странице.
• Если атрибут for не используется, элемент должен содержать атрибут value или дочерний текстовый узел для предоставления выходного значения.

Чем заменить тег

• использовать элемент или с соответствующим стилем и содержимым для отображения вывода;
• используйте JavaScript для динамического обновления вывода на странице.

👉 Другие теги для создания форм

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