rwt-corner-pocket

<figure> <img src='/img/components/corner-pocket/corner-pocket-1500x750.jpg' width='100%' /> <figcaption></figcaption> </figure> ##### Open Source DOM Component # Corner Pocket ## Website popup menu <address> <img src='/img/48x48/rwtools.png' /> by <a href='https://readwritetools.com' title='Read Write Tools'>Read Write Tools</a> <time datetime=2020-01-07>Jan 7, 2020</time></address> <table> <tr><th>Abstract</th></tr> <tr><td>The <span class=product>rwt-corner-pocket</span> DOM component is a popup menu using both text and icons. It is suitable for targeting a small list of external websites.</td></tr> </table> ### Motivation A website's main menu guides the visitor to internal documents, but occasionally there may be a desire to guide visitors to a short list of external websites that are somehow related. The <span>rwt-corner-pocket</span> DOM component is normally kept hidden until needed, when it slides into the viewport from any one of its four corners. Visibility of the menu is under control of a separate button that triggers the component's `toggleMenu` method or its event interface. The component has these features: * The position of the menu is relative to any one of the four viewport corners. * The menu has a title bar running vertically along its left edge. * Each menu item has both text and icon. * The menu item corresponding to the current page is highlighted when the page is loaded. * The menu has an event interface for showing/hiding itself. * The menu emits a custom event to close sibling menus and dialog boxes. * Menu items may be kept separate from the DOM component, allowing the webmaster to change its contents in a single centralized place. Alternatively, menu items may be slotted directly between the component's opening and closing tags. * A keyboard listener is provided to allow a shortcut key to expand/collapse the menu. #### In the wild To see an example of this component in use, visit the <a href='https://bluephrase.com'><span class=bp>BLUE</span><span class=phrase>PHRASE</span></a> website and press <kbd>F9</kbd> "Find It Here". To understand what's going on under the hood, use the browser's inspector to view the HTML source code and network activity, and follow along as you read this documentation. #### Prerequisites The <span>rwt-corner-pocket</span> DOM component works in any browser that supports modern W3C standards. Templates are written using <span> BLUE</span><span>PHRASE</span> notation, which can be compiled into HTML using the free <a href='https://hub.readwritetools.com/desktop/rwview.blue'>Read Write View</a> desktop app. It has no other prerequisites. Distribution and installation are done with either NPM or via Github. #### Download <details> <summary>Download using NPM</summary> <p><b>OPTION 1:</b> Familiar with Node.js and the <code>package.json</code> file?<br />Great. Install the component with this command:</p> <pre lang=bash> npm install rwt-corner-pocket<br /> </pre> <p><b>OPTION 2:</b> No prior experience using NPM?<br />Just follow these general steps:</p> <ul> <li>Install <a href='https://nodejs.org'>Node.js/NPM</a> on your development computer.</li> <li>Create a <code>package.json</code> file in the root of your web project using the command:</li> <pre lang=bash> npm init<br /> </pre> <li>Download and install the DOM component using the command:</li> <pre lang=bash> npm install rwt-corner-pocket<br /> </pre> </ul> <p style='font-size:0.9em'>Important note: This DOM component uses Node.js and NPM and <code>package.json</code> as a convenient <i>distribution and installation</i> mechanism. The DOM component itself does not need them.</p> </details> <details> <summary>Download using Github</summary> <p>If you prefer using Github directly, simply follow these steps:</p> <ul> <li>Create a <code>node_modules</code> directory in the root of your web project.</li> <li>Clone the <span class=product>rwt-corner-pocket</span> DOM component into it using the command:</li> <pre lang=bash> git clone https://github.com/readwritetools/rwt-corner-pocket.git<br /> </pre> </ul> </details> ### Using the DOM component After installation, you need to add four things to your HTML page to make use of it. * Add a `script` tag to load the component's `rwt-corner-pocket.js` file: ```html <script src='/node_modules/rwt-corner-pocket/rwt-corner-pocket.js' type=module></script> ``` * Add the component tag somewhere on the page. * For scripting purposes, apply an `id` attribute. * Apply a `sourceref` attribute with a reference to an HTML file containing the menu's hyperlinks. * Apply a `titlebar` attribute with the text that should appear along the left edge of the popup panel. * Apply a `corner` attribute with one of these values * top-left * top-right * bottom-left * bottom-right * Optionally, apply a `shortcut` attribute with something like `F3`, `F4`, etc. for hotkey access. * For WAI-ARIA accessibility apply a `role=navigation` attribute. * For simple menus, the `sourceref` may be omitted and the menu hyperlinks may be slotted into the DOM component. Simply place the hyperlinks directly between the `<rwt-corner-pocket>` and `</rwt-corner-pocket>` tags. * Here's an example HTML tag where the menu items are in a separate file: ```html <rwt-corner-pocket id=corner-pocket sourceref='/menu.html' corner='bottom-left' titlebar='Find It Here' shortcut=F3 role=navigation></rwt-corner-pocket> ``` * Add a button for the visitor to click to show the dialog: ```html <a id=corner-pocket-button title='Find It Here (F3)'>✚</a> ``` * Add a listener to respond to the click event: ```html <script type=module> document.getElementById('corner-pocket-button').addEventListener('click', (e) => { document.getElementById('corner-pocket').toggleDialog(e); }); </script> ``` #### Menu template The content and format of the each menu item should follow this pattern, which uses an anchor `<a>` that encloses a paragraph `<p>` and an image `<img>`. ```html <a sourceref='https://example.com' tabindex=301 title='Example website'> <p>Example Website</p> <img src='/img/example-logo.png' /> </a> ``` #### Self identification The menu item corresponding to the current page can be highlighted when it identifies itself to the menu. This is accomplished by adding a `meta` tag to the page where the `content` attribute specifies the URL of the menuitem to highlight, like this: ```html <meta name='corner-pocket:this-url' content='https://example.com' /> ``` ### Customization #### Menu items and sidebar sizing The images that you provide should be square. They will be resized using the value you specify with the CSS `--icon-size` variable. The height of each menuitem is specified with the `--item-height` variable. You must also specify how many menu items there are, using the `--num-items` variable. The overall height of the menu will be calculated by multiplying these two values. Vertical scroll bars are only shown when there are more items than specified here. The overall width of the popup panel is specified with the `--width` variable. The width of the sidebar title is specified with `--sidebar-width`, and the remainder is allocated to the menuitem's text and icon. The position of the panel's offset from the chosen corner is set with the `--top`, `--left`, `--bottom`, and `--right` variables. (Only the two variables corresponding to the chosen corner are needed.) ```css rwt-corner-pocket { --icon-size: 2rem; --item-height: 4rem; --num-items: 7; --sidebar-width: 2rem; --width: 20rem; --bottom: 30px; --left: 30px; --z-index: 1; } ``` #### Menu color scheme The default color palette for the menu uses a dark mode theme. You can use CSS to override the variables' defaults: ```css rwt-corner-pocket { --color: var(--white); --accent-color1: var(--yellow); --accent-color2: var(--gray); --background: var(--nav-black); --accent-background1: var(--light-black); --accent-background2: var(--medium-black); --accent-background3: var(--pure-black); } ``` ### Life-cycle events The component issues life-cycle events. <dl> <dt><code>component-loaded</code></dt> <dd>Sent when the component is fully loaded and ready to be used. As a convenience you can use the <code>waitOnLoading()</code> method which returns a promise that resolves when the <code>component-loaded</code> event is received. Call this asynchronously with <code>await</code>.</dd> </dl> ### Event controllers The menu can be controlled with its event interface. <dl> <dt><code>toggle-corner-pocket</code></dt> <dd>The component listens on DOM <code>document</code> for <code>toggle-corner-pocket</code> messages. Upon receipt it will expand or collapse the menu.</dd> <dt><code>keydown</code></dt> <dd>The component listens on DOM <code>document</code> for <code>keydown</code> messages. If the user presses the configured shortcut key (<kbd>F9</kbd>, <kbd>F10</kbd>, etc) it will collapse/expand the menu. The <kbd>Esc</kbd> key collapses the menu.</dd> <dt><code>collapse-popup</code></dt> <dd>The component listens on DOM <code>document</code> for <code>collapse-popup</code> messages, which are sent by sibling menus or dialog boxes. Upon receipt it will collapse itself.</dd> <dt><code>click</code></dt> <dd>The component listens on DOM <code>document</code> for <code>click</code> messages. When the user clicks anywhere outside the menu, it collapses itself.</dd> <hr /> <h3>Reference</h3> <table> <tr><td><img src='/img/48x48/read-write-hub.png' alt='DOM components logo' width=48 /></td> <td>Documentation</td> <td><a href='https://hub.readwritetools.com/components/corner-pocket.blue'>READ WRITE HUB</a></td></tr> <tr><td><img src='/img/48x48/git.png' alt='git logo' width=48 /></td> <td>Source code</td> <td><a href='https://github.com/readwritetools/rwt-corner-pocket'>github</a></td></tr> <tr><td><img src='/img/48x48/dom-components.png' alt='DOM components logo' width=48 /></td> <td>Component catalog</td> <td><a href='https://domcomponents.com/components/corner-pocket.blue'>DOM COMPONENTS</a></td></tr> <tr><td><img src='/img/48x48/npm.png' alt='npm logo' width=48 /></td> <td>Package installation</td> <td><a href='https://www.npmjs.com/package/rwt-corner-pocket'>npm</a></td></tr> <tr><td><img src='/img/48x48/read-write-stack.png' alt='Read Write Stack logo' width=48 /></td> <td>Publication venue</td> <td><a href='https://readwritestack.com/components/corner-pocket.blue'>READ WRITE STACK</a></td></tr> </table> <h3>License</h3> <dt>The <span class=product>rwt-corner-pocket</span> DOM component is licensed under the MIT License.</dt> <img class=license src='/img/blue-seal-mit.png' width=80 align=right /> <details class=license> <summary>MIT License</summary> <p>Copyright © 2020 Read Write Tools.</p> <p>Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:</p> <p>The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.</p> <p>THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.</p> </details> </dl>