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+---
+pagetitle: Viewer user manual - ldgallery
+title: LDGALLERY-VIEWER(7) ldgallery
+author: Pacien TRAN-GIRARD, Guillaume FOUET
+date: 2020-04-30 (v1.0)
+---
+
+
+# NAME
+
+ldgallery viewer - a static web gallery viewer with tags
+
+
+# DESCRIPTION
+
+The ldgallery viewer is a web application that allows users to browse, search through and view items in galleries generated by the ldgallery(1) compiler.
+
+The web application runs in a JavaScript-enabled web browser and does not require any special software on the server's side.
+Its responsiveness allows it to be used from either a desktop browser or some mobile device.
+
+
+# USER INTERFACE
+
+The viewer's user interface is split into a main item view and a side search panel, which can be opened by using the appropriate button in the toolbar at the top-left corner.
+
+The main view displays the gallery's directories and items as a thumbnail grid.
+
+The side panel allows the user to interactively enter filtering queries to search through the gallery's content.
+This panel features a list of relevant tags, grouped by categories, that can be used to build the search query.
+
+Picture items can be opened and visualised within the application.
+Other types of elements are either downloaded or displayed in the same window depending on the user's web browser supported media types.
+
+
+# SEARCH QUERIES
+
+Items can be filtered based on their tags.
+Adding tags to the search query restricts the search results to items having those tags.
+Tags which belong to multiple categories may be disambiguated by adding their category as a prefix, separated by a colon (":").
+
+The following modifiers can be used in queries as prefixes of tags:
+
+`+`
+: Include all items having the associated tag, independently of simple tag restrictions.
+
+`-`
+: Exclude all items having the associated tag, independently of simple tag restrictions and inclusions.
+
+Autocompletion suggestions are shown as filters are being typed in the query field.
+In the case of disambiguated tags, both the category and the tag components are allowed to be partially entered, allowing "loc:fra" to expand into "location:france" for example.
+
+
+# VIEWER CONFIGURATION
+
+The viewer itself can be configured through a JSON file named "config.json" and placed in the web viewer's directory.
+
+galleryRoot
+: Absolute or relative path to the root of the gallery to display.
+
+
+# PROGRESSIVE WEB APPLICATION
+
+This web application can be "installed" on some user's mobile device as a progressive web application, i.e. a shortcut giving the web page the appearance of a native application.
+
+This feature can be enabled by adding a PWA manifest in the viewer's directory when deployed.
+An example of such manifest and an associated icon are available in the example folder packaged with the viewer.
+
+
+# SEE ALSO
+
+Related manual pages: __ldgallery__(1), __ldgallery-quickstart__(7)
+
+The ldgallery source code is available on <https://ldgallery.pacien.org>.
+
+
+# LICENSE
+
+Copyright (C) 2019-2020  Pacien TRAN-GIRARD and Guillaume FOUET.
+
+This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
+
+This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+See the GNU Affero General Public License for more details <https://www.gnu.org/licenses/agpl-3.0.html>.