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/**

 * The old mw.util.jsMessage function before https://gerrit.wikimedia.org/r/#/c/17605/, which

 * introduced the silly auto-hide function. Also with the original styles.

 * Add a little box at the top of the screen to inform the user of

 * something, replacing any previous message.

 * Calling with no arguments, with an empty string or null will hide the message

 *

 * @param message {mixed} The DOM-element, jQuery object or HTML-string to be put inside the message box.

 * @param className {String} Used in adding a class; should be different for each call

 * to allow CSS/JS to hide different boxes. null = no class used.

 * @return {Boolean} True on success, false on failure.

 */

function displayMessage( message, className ){

	if ( !arguments.length || message === '' || message === null ) {

		$( '#display-message' ).empty().hide();

		return true; // Emptying and hiding message is intended behaviour, return true

	} else {

		// We special-case skin structures provided by the software. Skins that

		// choose to abandon or significantly modify our formatting can just define

		// an mw-js-message div to start with.

		var $messageDiv = $( '#display-message' );

		if ( !$messageDiv.length ) {

			$messageDiv = $( '<div id="display-message" style="margin:1em;padding:0.5em 2.5%;border:solid 1px #ddd;background-color:#fcfcfc;font-size: 0.8em"></div>' );

			if ( mw.util.$content.length ) {

				mw.util.$content.prepend( $messageDiv );

			} else {

				return false;

			}

		}

		if ( className ) {

			$messageDiv.prop( 'class', 'display-message-' + className );

		}

		if ( typeof message === 'object' ) {

			$messageDiv.empty();

			$messageDiv.append( message );

		} else {

			$messageDiv.html( message );

		}

		$messageDiv.slideDown();

		return true;

	}

}
From Wikipedia, the free encyclopedia
Note: After saving, you have to bypass your browser's cache to see the changes. Google Chrome, Firefox, Microsoft Edge and Safari: Hold down the ⇧ Shift key and click the Reload toolbar button. For details and instructions about other browsers, see Wikipedia:Bypass your cache.

/**

 * The old mw.util.jsMessage function before https://gerrit.wikimedia.org/r/#/c/17605/, which

 * introduced the silly auto-hide function. Also with the original styles.

 * Add a little box at the top of the screen to inform the user of

 * something, replacing any previous message.

 * Calling with no arguments, with an empty string or null will hide the message

 *

 * @param message {mixed} The DOM-element, jQuery object or HTML-string to be put inside the message box.

 * @param className {String} Used in adding a class; should be different for each call

 * to allow CSS/JS to hide different boxes. null = no class used.

 * @return {Boolean} True on success, false on failure.

 */

function displayMessage( message, className ){

	if ( !arguments.length || message === '' || message === null ) {

		$( '#display-message' ).empty().hide();

		return true; // Emptying and hiding message is intended behaviour, return true

	} else {

		// We special-case skin structures provided by the software. Skins that

		// choose to abandon or significantly modify our formatting can just define

		// an mw-js-message div to start with.

		var $messageDiv = $( '#display-message' );

		if ( !$messageDiv.length ) {

			$messageDiv = $( '<div id="display-message" style="margin:1em;padding:0.5em 2.5%;border:solid 1px #ddd;background-color:#fcfcfc;font-size: 0.8em"></div>' );

			if ( mw.util.$content.length ) {

				mw.util.$content.prepend( $messageDiv );

			} else {

				return false;

			}

		}

		if ( className ) {

			$messageDiv.prop( 'class', 'display-message-' + className );

		}

		if ( typeof message === 'object' ) {

			$messageDiv.empty();

			$messageDiv.append( message );

		} else {

			$messageDiv.html( message );

		}

		$messageDiv.slideDown();

		return true;

	}

}

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