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x/tag/examples/hello/hello-universe.html

A tiny functionally declarative reactive web programming kernel
tylerchilds/tag
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<!doctype html><html lang=""><head>  <meta charset="utf-8">  <title>Hello Universe</title>  <meta name="description" content="">  <meta name="viewport" content="width=device-width, initial-scale=1">
  <!-- define critial styles inline the head of the document -->  <style type="text/css">    html {      height: 100%;      font-family: sans-serif;      text-align: center;    }
    body {      color: cornsilk;      background: radial-gradient(        indigo,        darkslateblue,        darkslategrey,        black      ) no-repeat;      overflow: hidden;      height: 100%;    }  </style></head>
<body>  <h1 style="margin: 0;">Hello Universe</h1>  <!-- optionally set a zero state in between the tags -->  <hello-universe>    Application is loading...  </hello-universe>
  <script type="module">    import tag from '../../mod.js'
    const $ = tag('hello-universe', {      // set an initial array of planets      'planets': [        {          'id': 'mercury',          'name': 'Mercury',          'background': 'sienna'        },        {          'id': 'venus',          'name': 'Venus',          'background': 'darkgoldenrod'        },        {          'id': 'Earth',          'name': 'Earth',          'background': 'deepskyblue'        },        {          'id': 'mars',          'name': 'Mars',          'background': 'orangered'        },        {          'id': 'jupiter',          'name': 'Jupiter',          'background': 'lightsalmon'        },        {          'id': 'saturn',          'name': 'Saturn',          'background': 'bisque'        },        {          'id': 'neptune',          'name': 'Neptune',          'background': 'dodgerblue'        },        {          'id': 'uranus',          'name': 'Uranus',          'background': 'darkturquoise'        }      ],      // an incrementable integer for looping through planets      'tick': 0,      // a boolean value to control visibility of the admin view      'showAdmin': false    })
    // increase our tick twice a second (once every 500 milliseconds)    setInterval(function tick() {      const { tick } = $.read()      $.write({ tick: tick + 1 })    }, 500)
    $.render(() => {      // pluck our current values from our current state      const { planets, tick, showAdmin } = $.read()
      // get the current planet by modulo of current tick by # of planets      const current = planets[tick % planets.length]
      // save html for displaying the current planet      const view = `        <button class="admin-toggle">          Manage Planets        </button>        <planet style="--planet-background: ${current.background}">          <greeting>Hello ${current.name}</greeting>        </planet>      `
      // save html for displaying the admin view      const admin = `        <button class="admin-toggle">          View Planets        </button>        <admin>          ${renderAdministrationTable(planets)}          <button class="add-planet">Add Planet</button>        </admin>      `
      // determine which html is visible      return showAdmin ? admin : view    })
    // toggle the showAdmin variable on button click    $.on('click', 'button.admin-toggle', () => {      const showAdmin = ! $.read().showAdmin      $.write({ showAdmin })    })
    // create a random planet with the current tick as a seed    $.on('click', 'button.add-planet', () => {      const { tick } = $.read()      $.write({        id: `planet-${tick}`,        name: `Planet ${tick}`,        background: 'cornsilk'      }, addPlanet)    })
    // surgically add a new planet to our tag's state    function addPlanet(state, payload) {      return {        ...state,        planets: [          ...state.planets,          payload        ]      }    }
    // update planet information when input values have been changed    $.on('keyup', 'admin input', (event) => {      const { value, dataset } = event.target      const { id, attribute } = dataset
      $.write({        id,        attribute,        value      }, updatePlanet)    })
    // return the index of the planet with a given id    function getPlanetIndexById(id) {      const index = $.read().planets        .findIndex(x => x.id === id)
      return index    }
    // surgically update planet information in our tag's state    function updatePlanet(state, payload){      const { id, attribute, value } = payload
      const index = getPlanetIndexById(id)      const planet = state.planets[index]
      return {        ...state,        planets: [          ...state.planets.slice(0, index),          { ...planet, [attribute]: value },          ...state.planets.slice(index + 1)        ]      }    }
    // loop over the planets array to create a complex form to manage values    function renderAdministrationTable(planets) {      const rows = planets.map(x => `        <input type="text" data-id="${x.id}"          value="${x.id}" data-attribute="id" />        <input type="text" data-id="${x.id}"          value="${x.name}" data-attribute="name" />        <input type="text" data-id="${x.id}"          value="${x.background}" data-attribute="background" />      `).join('')
      return `        <admin-table>          <cell-head>ID</cell-head>          <cell-head>Name</cell-head>          <cell-head>Background</cell-head>        </admin-table>        <admin-table>          ${rows}        </admin-table>      `    }
    // create scoped rulesets for all of our content    $.style(`      & {        display: block;        margin: 0 auto;      }
      & button {        background: rgba(255, 255, 255, .75);        border: 1px solid;        border-color:          rgba(255, 255, 255, .5)          rgba(0, 0, 0, .75)          rgba(0, 0, 0, .75)          rgba(0, 0, 0, .75);        border-radius: 2px;        font-size: 1rem;        font-weight: bold;        padding: .5rem;      }
      & button:hover {        background: rgba(255, 255, 255, .5);        border-color:          rgba(0, 0, 0, .75)          rgba(255, 255, 255, .5)          rgba(255, 255, 255, .5)          rgba(255, 255, 255, .5);        cursor: pointer;      }
      & planet {        background: var(--planet-background, cornsilk);        border-radius: 100%;        display: grid;        grid-template-areas: 'greeting';        height: 75vmin;        margin: 0 auto;        mix-blend-mode: lighten;        position: relative;        width: 75vmin;      }
      & planet greeting {        background: cornsilk;        border-radius: 100%;        color: darkslategray;        grid-area: greeting;        place-self: center;        font-size: 5vmin;        padding: 3rem;      }
      & admin {        background: rgba(0, 0, 0, .85);        border-radius: 1rem;        display: block;        margin: 0 auto;        max-width: 500px;        padding: 2rem 1rem;      }
      & admin-table {        display: grid;        grid-template-columns: repeat(3, minmax(80px, 1fr));        gap: 10px;        max-height: 40vh;        overflow-y: auto;        margin-bottom: 10px;      }
      & cell-head {        font-weight: bold;      }
      & input {        background: rgba(33, 33, 33, .85);        border: 1px solid rgba(255, 255, 255, .2);        border-radius: 2px;        color: cornsilk;        height: 1.5rem;      }
      & .admin-toggle {        margin: 1rem;      }
      & .add-planet {        grid-column: 1 / -1;      }    `)  </script></body>
</html>