What Our Screens Should Look Like: An Introduction to Effective OPAC Screens.

Fuente: ERIC Institute of Education Sciences

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Bibliographic Details
Main Authors:	Shires, Nancy Lee, Olszak, Lydia P.
Format:	Recurso educativo Open Access
Language:	en
Published:	1992
Subjects:	Check Lists Design Requirements Library Catalogs Man Machine Systems Menu Driven Software Online Catalogs User Needs (Information)
Online Access:	Acceder al recurso
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author	Shires, Nancy Lee Olszak, Lydia P.
author_facet	Shires, Nancy Lee Olszak, Lydia P. Shires, Nancy Lee Olszak, Lydia P.
collection	Education Resources Information Center
contents	What Our Screens Should Look Like: An Introduction to Effective OPAC Screens. Shires, Nancy Lee Olszak, Lydia P. Check Lists Design Requirements Library Catalogs Man Machine Systems Menu Driven Software Online Catalogs User Needs (Information) Discusses basic principles of human-computer interface design that will be helpful to librarians involved in designing effective OPAC (Online Public Access Catalog) screens. Highlights include physical features; general principles; menu screens; commands; inquiry screens; messages, including help screens; and organizational considerations, including user involvement. Checklists are provided for these areas. (25 references) (LRW)
format	Recurso educativo Open Access
id	eric_EJ444800
institution	ERIC Institute of Education Sciences
language	en
publishDate	1992
record_format	eric
spellingShingle	What Our Screens Should Look Like: An Introduction to Effective OPAC Screens. Shires, Nancy Lee Olszak, Lydia P. Check Lists Design Requirements Library Catalogs Man Machine Systems Menu Driven Software Online Catalogs User Needs (Information) What Our Screens Should Look Like: An Introduction to Effective OPAC Screens. Shires, Nancy Lee Olszak, Lydia P. Check Lists Design Requirements Library Catalogs Man Machine Systems Menu Driven Software Online Catalogs User Needs (Information) Discusses basic principles of human-computer interface design that will be helpful to librarians involved in designing effective OPAC (Online Public Access Catalog) screens. Highlights include physical features; general principles; menu screens; commands; inquiry screens; messages, including help screens; and organizational considerations, including user involvement. Checklists are provided for these areas. (25 references) (LRW)
title	What Our Screens Should Look Like: An Introduction to Effective OPAC Screens.
topic	Check Lists Design Requirements Library Catalogs Man Machine Systems Menu Driven Software Online Catalogs User Needs (Information)
url	https://eric.ed.gov/?id=EJ444800

if (filemtime($filename) + $maxlifetime < time()) { unlink($filename); $count++; } } return $count; } /** * A function that is called internally when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ protected function saveSession($sessId, $data): bool { $sessFile = $this->path . '/sess_' . $sessId; if ($handle = fopen($sessFile, 'w')) { $return = false; // Lock the file for exclusive access to avoid issues with multiple // processes writing session simultaneously: if (flock($handle, LOCK_EX)) { $return = fwrite($handle, $data); // Make sure that there's no trailing data by truncating the file to // the correct length: ftruncate($handle, strlen($data)); fflush($handle); flock($handle, LOCK_UN); } fclose($handle); if ($return !== false) { return true; } } // If we got this far, something went wrong with the file output... // It is tempting to throw an exception here, but this code is called // outside of the context of exception handling, so all we can do is // echo a message.

// Anecdotal testing Today and Yesterday seems to indicate destroy() // is called by the garbage collector and everything is good. // Something to keep in mind though. return 0; } /** * Write function that is called when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ public function write($sessId, $data): bool { if ($this->writesDisabled) { return true; } return $this->saveSession($sessId, $data); } /** * A function that is called internally when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ abstract protected function saveSession($sessId, $data): bool; }

* * @return void */ public function writeClose() { // The assumption is that we're using PHP's ext/session. // session_write_close() will actually overwrite $_SESSION with an // empty array on completion -- which leads to a mismatch between what // is in the storage object and $_SESSION. To get around this, we // temporarily reset $_SESSION to an array, and then re-link it to // the storage object. // // Additionally, while you _can_ write to $_SESSION following a // session_write_close() operation, no changes made to it will be // flushed to the session handler. As such, we now mark the storage // object isImmutable. $storage = $this->getStorage(); if (! $storage->isImmutable()) { $_SESSION = $storage->toArray(true); session_write_close(); $storage->fromArray($_SESSION); $storage->markImmutable(); } } /** * Attempt to set the session name * * If the session has already been started, or if the name provided fails * validation, an exception will be raised. * * @param string $name * @return SessionManager * @throws Exception\InvalidArgumentException */ public function setName($name) { if ($this->sessionExists()) { throw new Exception\InvalidArgumentException( 'Cannot set session name after a session has already started'

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