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local-storage.html
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<!DOCTYPE html>
<html lang="en" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" >
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title>custom-element Declarative Custom Element implementation demo</title>
<link rel="icon" href="./wc-square.svg" />
<script type="module" src="../local-storage.js"></script>
<script type="module" src="../custom-element.js"></script>
<style>
@import "./demo.css";
button{ background: forestgreen; }
table{ min-width: 16rem; }
td{ border-bottom: 1px solid silver; }
tfoot td{ border-bottom: none; }
td,th{text-align: right; }
caption{ padding: 1rem; font-weight: bolder; font-family: sans-serif; }
</style>
<script>
window.JsonSample = {a:1,b:'B'};
</script>
</head>
<body>
<nav>
<a href="../index.html"><h3><code>custom-element</code> demo</h3></a>
</nav>
<main>
<code>local-storage</code> allows to read and write its value to the key in <code>localStorage</code>.
The <code>type</code> attribute allows to place the validation constrains to the value: when the value does not
match the expected type, it would not be assigned, keeping empty <code>value</code> instead.
</main>
<html-demo-element legend="0. read localStorage text value"
description="click should set text-key slice via localStorage change.">
<template>
<custom-element>
<template>
<local-storage key="textKey" slice="text-key" type="text" live="live"></local-storage>
<button onclick="localStorage.setItem('textKey','text value')">text value</button>
<button onclick="localStorage.setItem('textKey','another value')">another value</button>
//text-key: <code>{//text-key}</code>
</template>
</custom-element>
</template>
</html-demo-element>
<html-demo-element legend="1. always override "
description="value in localStorage[] should be always reset to ABC. click should set text-key slice via localStorage change.">
<template>
<custom-element>
<template>
<!-- always reset -->
<local-storage slice="override-key" key="overrideKey" type="text" value="ABC"></local-storage>
<button onclick="localStorage.setItem( 'overrideKey','text value')">text value</button>
<button onclick="localStorage.removeItem('overrideKey' )">clear key</button>
//override-key: <code>{ //override-key }</code>
</template>
</custom-element>
</template>
</html-demo-element>
<html-demo-element legend="2. from storage with default "
description="default overridden by button, refresh should preserve updated value">
<template>
<custom-element>
<template>
<!-- initially set value to DEF and update by button. On reload the value picked from localStorage -->
<local-storage key="attr2Key" slice="attr2-key" type="text" live="live" slice-value="@value ?? 'DEF'"></local-storage>
<button onclick="localStorage.clear()">clear localStorage</button>
<button onclick="localStorage.removeItem('attr2Key')">clear key</button>
<button onclick="localStorage.setItem('attr2Key','text value')">updated value</button>
//attr2-key: <code>{//attr2-key}</code>
</template>
</custom-element>
</template>
</html-demo-element>
<html-demo-element legend="3. localStorage type"
description="type validation happy path. Invalid for type value in storage would be treated as null">
<template>
<custom-element>
<template>
<local-storage key="dateKey" slice="date-key" type="date" live="live"></local-storage>
<local-storage key="timeKey" slice="time-key" type="time" live="live"></local-storage>
<local-storage key="localDateTimeKey" slice="local-date-time" type="datetime-local" live="live"></local-storage>
<local-storage key="numberKey" slice="number-key" type="number" live="live"></local-storage>
<local-storage key="jsonKey" slice="json-key" type="json" live="live"></local-storage>
<input id="typesinput" placeholder="set value" /><button onclick="
'dateKey,timeKey,localDateTimeKey,numberKey,jsonKey'.split(',')
.map( k=> localStorage.setItem(k, typesinput.value) )
"> set to all</button><br/>
<hr/>
date-key:
<button onclick="localStorage.setItem('dateKey', '2024-04-20T03:58:42.131Z')" >2024-04-21T03:58:42.131Z </button>
<button onclick="localStorage.setItem('dateKey', new Date(Date.now()).toISOString())" >now </button>
<button onclick="localStorage.setItem('dateKey', 'ABC' )" >date ABC - invalid </button>
<code>{//date-key }</code><br/>
time-key:
<button onclick="localStorage.setItem('timeKey', '13:30')" >13:30 </button>
<code>{//time-key }</code><br/>
local-date-time:
<button onclick="localStorage.setItem('localDateTimeKey', '1977-04-01T14:00:30')" >21977-04-01T14:00:30 - local </button>
<code>{//local-date-time}</code><br/>
number-key:
<button onclick="localStorage.setItem('numberKey', '2024' )" >2024 - number </button>
<button onclick="localStorage.setItem('numberKey', '24' )" >24 - number </button>
<button onclick="localStorage.setItem('numberKey', '1.23456e+5' )" >1.23456e+5 </button>
<button onclick="localStorage.setItem('numberKey', '0001' )" >0001 </button>
<button onclick="localStorage.setItem('numberKey', '000' )" >000 </button>
<button onclick="localStorage.setItem('numberKey', '0' )" >0 </button>
<button onclick="localStorage.setItem('numberKey', 'ABC' )" >ABC - invalid, NaN </button>
<code>{//number-key }</code> <br/>
<fieldset>
<legend>json-key: </legend>
<button onclick="localStorage.setItem('jsonKey', JSON.stringify('ABC'))" >'ABC' - string </button>
<button onclick="localStorage.setItem('jsonKey', JSON.stringify(12.345))" >12.345 - number </button>
<button onclick="localStorage.setItem('jsonKey', JSON.stringify(window.JsonSample) )" >a:1,b:'B' -json </button>
<button onclick="localStorage.setItem('jsonKey', 'ABC' )" >ABC - invalid </button><br/>
json-key:<code><xsl:apply-templates select="//json-key/value/@*|//json-key/text()|//json-key/value/text()" mode="json"></xsl:apply-templates></code>
</fieldset>
<xsl:template mode="json" match="*|@*">
<div>{name()} : {.}</div>
</xsl:template>
</template>
</custom-element>
</template>
</html-demo-element>
<html-demo-element legend="3. localStorage simplest"
description="local-storage read only during initial and only render, does not track the changes.">
<p>Has to produce 12🍒</p>
<template>
<custom-element tag="dce-1" hidden>
{//slice/fruits/text()}
<slot>🤔</slot>
<local-storage key="cherries" slice="fruits"></local-storage>
</custom-element>
<dce-1>🍒</dce-1>
</template>
</html-demo-element>
<html-demo-element legend="2. localStorage basket JSON "
description="local-storage tracks changes">
<p>Click the fruits button to add into cart </p>
<template>
<custom-element tag="dce-2" hidden>
<template>
<local-storage key="basket" slice="basket" live type="json"></local-storage>
<xhtml:table xmlns:xhtml="http://www.w3.org/1999/xhtml" >
<xhtml:tbody>
<for-each select="//basket/value/@*">
<xhtml:tr>
<xhtml:th> {name()} </xhtml:th>
<xhtml:td> {.} </xhtml:td>
</xhtml:tr>
</for-each>
</xhtml:tbody>
<xhtml:tfoot>
<xhtml:tr>
<xhtml:td><slot>🤔</slot></xhtml:td>
<xhtml:th> {sum(//slice/basket/value/@*)} </xhtml:th>
</xhtml:tr>
</xhtml:tfoot>
</xhtml:table>
</template>
</custom-element>
<dce-2>🛒total</dce-2>
</template>
</html-demo-element>
<fieldset>
<legend>localStorage content</legend>
<p>The demo should display count 1🍋 and 12🍒 initially.
The value in <code>localStorage</code> is incremented
when clicked on matching button
</p>
<button name="lemons" value="1" >🍋</button>
<button name="cherries" value="12" >🍒</button>
<button name="apple" >🍏</button>
<button name="banana" >🍌</button>
<table>
<caption> Click to add the localStorage value </caption>
<thead><tr><th>key</th><th>value</th></tr></thead>
<tbody id="local-storage-values"></tbody>
</table>
</fieldset>
<script type="module">
import { localStorageSetItem } from '../local-storage.js';
import $ from 'https://unpkg.com/css-chain@1/CssChain.js';
const basket = {cherries: 12, lemons:1 };
localStorageSetItem( 'basket', JSON.stringify(basket) );
$('button[name]')
.forEach( b=> localStorage.setItem( b.name, b.value ) )
.addEventListener( 'click', e =>
{ const k = e.target.name;
basket[k] || (basket[k] = 1);
localStorageSetItem( k, basket[k] = 1+1*localStorage[k] )
localStorageSetItem( 'basket', JSON.stringify(basket) );
renderStorage();
} );
const renderStorage = () =>
window[ 'local-storage-values' ].innerHTML = [...Array(localStorage.length).keys()]
.map( k => `<tr><th>${ localStorage.key(k) }</th><td>${ localStorage.getItem( localStorage.key(k) ) }</td>` ).join( '\n' );
window.addEventListener( 'storage', renderStorage );
window.addEventListener( 'local-storage', renderStorage );
renderStorage();
</script>
<script type="module" src="https://unpkg.com/html-demo-element@1/html-demo-element.js"></script>
</body>
</html>