textareaの無効化およびreadonlyプロパティ

disabledの定義と使い方

disabled属性は、ブール値のプロパティです。

disabled属性は、テキストエリアを無効にすることを指定します。

無効化されたテキストエリアは利用できず、テキストを選択することもできません（コピーもできません）。

disabledプロパティは、特定の条件（チェックボックスの選択など）を満たすまで、ユーザーがテキストエリアを使用できないように設定することができます。その後、JavaScriptを使用してdisabledプロパティの値を削除することで、テキストエリアを使用可能にすることができます。

HTML4.01とHTML5の違いについて

なし

HTMLとXHTMLの違い
/{br In XHTML, the disabled attribute is minimized and the disabled attribute must be defined as . </p>The <p>The disabled attribute indicates a disabled text area where the content cannot be modified and the value cannot be passed in the request. </p><div><pre> <code><textarea disabled> At Script House you will learn how to make websites. We offer the most complete tutorials on web technologies.

The difference between disabled and disabled = "disabled"

disabled = "disabled" is the XML specification and must be written as disabled = "disabled" if it is to remain XML compliant, if you are not using XHTML and don't care about the XML syntax then you can use it alone.

Note: In browsers other than Firefox, e.g. chrome can be selected and copied. </p><p><strong>readonly definition and usage </strong></p>The <p>The readonly attribute is a boolean property. </p>The <p>readonly attribute specifies that the text area is read-only. </p><p>In a read-only text area, the contents cannot be modified, but the user can switch to the control with the tab key to select or copy its contents. </p><p>The readonly property can be set to restore the user's access to the text area until certain conditions are met, such as selecting a checkbox. The value of the readonly property can then be removed using JavaScript to make the text area editable. readonly specifies that the text area is read-only. In a read-only text area, the contents cannot be modified. The value can be passed in the request . </p><p>The specific usage is as follows. <br></br></p><div><pre> <code><textarea readonly="readonly">test1 test2

Differences between HTML and XHTML
/{br In XHTML, the attribute minimization is disabled and the readonly attribute must be defined as . </p><div><span></span></div></div>