DataStructureVisualisers/ChainedHashTable.html at main · UCLComputerScience/DataStructureVisualisers · GitHub

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<!doctype html>

<head>

<title>Hash Table Visualizer</title>

<style>

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@500;700&display=swap');

body {

font-family: 'Inter', sans-serif;

}

.mono {

font-family: 'JetBrains Mono', monospace;

}

.node-update {

animation: pulse-green 0.8s ease-in-out;

}

@keyframes pulse-green {

0% {

ring-width: 0px;

transform: scale(1);

}

50% {

ring-width: 4px;

ring-color: #34d399;

transform: scale(1.1);

border-color: #10b981;

}

100% {

ring-width: 0px;

transform: scale(1);

}

.slot-highlight {

background-color: #eef2ff;

border-color: #818cf8;

transform: scale(1.05);

box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);

z-index: 10;

}

/* Custom scrollbar for better density */

::-webkit-scrollbar {

height: 8px;

width: 8px;

}

::-webkit-scrollbar-track {

background: #f1f5f9;

}

::-webkit-scrollbar-thumb {

background: #cbd5e1;

border-radius: 4px;

}

::-webkit-scrollbar-thumb:hover {

background: #94a3b8;

}

</style>

</head>

<header

class="mb-6 bg-white p-4 rounded-xl shadow-sm border border-slate-200"

<div

class="flex flex-col md:flex-row justify-between items-start md:items-center gap-4"

<div

class="p-2 bg-indigo-600 rounded-lg text-white shadow-md shadow-indigo-100"

<svg

xmlns="http://www.w3.org/2000/svg"

class="w-5 h-5"

viewBox="0 0 24 24"

fill="none"

stroke="currentColor"

stroke-width="2"

stroke-linecap="round"

stroke-linejoin="round"

</svg>

</div>

<div>

Hash Table Visualizer

</h1>

<p class="text-xs text-slate-400">Chained Collision Handling</p>

</div>

<label class="text-[10px] font-bold text-slate-400 uppercase mb-1"

>Table Size</label

<select

id="tableSizeSelect"

class="bg-slate-100 border-none rounded-md px-2 py-1.5 text-sm outline-none focus:ring-2 focus:ring-indigo-400 cursor-pointer"

<option value="4">4 Slots</option>

<option value="8">8 Slots</option>

<option value="12" selected>12 Slots</option>

<option value="16">16 Slots</option>

<option value="24">24 Slots</option>

<option value="32">32 Slots</option>

</select>

</div>

<label class="text-[10px] font-bold text-slate-400 uppercase mb-1"

>Find Key</label

<svg

xmlns="http://www.w3.org/2000/svg"

class="absolute left-2 top-1/2 -translate-y-1/2 w-3.5 h-3.5 text-slate-400"

viewBox="0 0 24 24"

fill="none"

stroke="currentColor"

stroke-width="2"

stroke-linecap="round"

stroke-linejoin="round"

</svg>

<input

id="searchInput"

type="text"

placeholder="Search..."

class="bg-slate-100 border-none rounded-md pl-7 pr-2 py-1.5 text-sm outline-none focus:ring-2 focus:ring-indigo-400 w-28"

</div>

<button

id="addBtn"

class="bg-indigo-600 hover:bg-indigo-700 text-white px-3 py-1.5 rounded-md text-sm font-medium transition-all flex items-center gap-1.5 shadow-sm active:scale-95"

<svg

xmlns="http://www.w3.org/2000/svg"

class="w-4 h-4"

viewBox="0 0 24 24"

fill="none"

stroke="currentColor"

stroke-width="2"

stroke-linecap="round"

stroke-linejoin="round"

</svg>

Add

</button>

<button

id="addTenBtn"

class="bg-indigo-100 hover:bg-indigo-200 text-indigo-700 px-3 py-1.5 rounded-md text-sm font-medium transition-all flex items-center gap-1.5 active:scale-95"

<svg

xmlns="http://www.w3.org/2000/svg"

class="w-4 h-4"

viewBox="0 0 24 24"

fill="none"

stroke="currentColor"

stroke-width="2"

stroke-linecap="round"

stroke-linejoin="round"

</svg>

+10

</button>

<button

id="clearBtn"

class="bg-white border border-slate-200 hover:bg-red-50 hover:text-red-600 text-slate-600 px-3 py-1.5 rounded-md text-sm font-medium transition-all active:scale-95"

Clear

</button>

</div>

<div

class="mt-4 flex flex-wrap items-center gap-x-6 gap-y-2 border-t border-slate-50 pt-4 text-sm"

<span class="text-[10px] font-bold text-slate-400 uppercase"

>Elements:</span

</div>

<span class="text-[10px] font-bold text-slate-400 uppercase"

>Collisions:</span

</div>

<span class="text-[10px] font-bold text-slate-400 uppercase"

>Load:</span

</div>

<div

id="activityLog"

class="flex items-center gap-2 px-3 py-1 rounded-full bg-slate-50 text-[10px] font-bold text-slate-500 uppercase border border-slate-100"

<svg

xmlns="http://www.w3.org/2000/svg"

class="w-3 h-3 text-indigo-500"

viewBox="0 0 24 24"

fill="none"

stroke="currentColor"

stroke-width="2"

stroke-linecap="round"

stroke-linejoin="round"

</svg>

Last: Ready

</div>

</header>

<div

class="bg-white p-4 rounded-xl shadow-sm border border-slate-200 min-h-[400px] overflow-x-auto"

</div>

<footer

class="mt-6 bg-slate-100 p-4 rounded-xl text-[11px] text-slate-500 grid md:grid-cols-3 gap-4 border border-slate-200"

<div>

<p class="font-bold uppercase text-slate-400 mb-1">HTML/JS Version</p>

<p>

This single-page version maintains a unique key policy. Adding an

existing word increments its value instead of creating a new node.

</p>

</div>

<div>

<p class="font-bold uppercase text-slate-400 mb-1">Complexity</p>

<p>

Lookup is <span class="text-indigo-600 mono">O(1)</span> average.

High load factors increase collision probability, leading to

<span class="text-amber-600 mono">O(n)</span> chains.

</p>

</div>

<div>

Visualization Info

</p>

<p>

The

<span class="text-emerald-500 font-bold">Green Dot</span> represents

a pointer to another node. The

<span class="text-red-400 font-bold">Red Dot</span> indicates a null

pointer (end of chain).

</p>

</div>

</footer>

</div>

// Data & State

const WORD_LIST = [

'apple',

'banana',

'cherry',

'date',

'elderberry',

'fig',

'grape',

'honey',

'ice',

'joker',

'kiwi',

'lemon',

'mango',

'nut',

'orange',

'pear',

'quince',

'raspberry',

'strawberry',

'tomato',

'ugli',

'vanilla',

'watermelon',

'xenia',

'yam',

'zest',

'alpha',

'beta',

'gamma',

'delta',

'epsilon',

'zeta',

'eta',

'theta',

'iota',

'kappa',

'lambda',

'mu',

'nu',

'xi',

'omicron',

'pi',

'rho',

'sigma',

'tau',

'upsilon',

'phi',

'chi',

'psi',

'omega',

'ace',

'beam',

'coin',

'door',

'echo',

'fuel',

'glow',

'halo',

'iron',

'jade',

'kite',

'leaf',

'mist',

'neon',

'opal',

'plum',

'quartz',

'ruby',

'star',

'tide',

'unit',

'vent',

'wave',

'yarn',

'zinc',

'bolt',

'clay',

'dusk',

'edge',

'film',

'grid',

'haze',

'ink',

'jazz',

'knob',

'link',

'maze',

'node',

'oath',

'path',

'quiz',

'raft',

'silk',

'trap',

'urge',

'vibe',

'whip',

'yoga',

'zeal',

'apex',

];

let state = {

tableSize: 12,

hashTable: [],

highlightedIndex: null,

searchKey: '',

updatedNodeId: null,

};

// DOM Elements

const grid = document.getElementById('visualizerGrid');

const tableSizeSelect = document.getElementById('tableSizeSelect');

const searchInput = document.getElementById('searchInput');

const addBtn = document.getElementById('addBtn');

const addTenBtn = document.getElementById('addTenBtn');

const clearBtn = document.getElementById('clearBtn');

const statCount = document.getElementById('statCount');

const statCollisions = document.getElementById('statCollisions');

const statLoad = document.getElementById('statLoad');

const activityLog = document.getElementById('activityLog');

// Logic

function calculateHash(key, size) {

let hash = 0;

for (let i = 0; i < key.length; i++) {

hash = (hash << 5) - hash + key.charCodeAt(i);

hash |= 0;

}

return Math.abs(hash) % size;

}

function initTable() {

state.hashTable = Array.from({ length: state.tableSize }, () => []);

state.updatedNodeId = null;

state.highlightedIndex = null;

render();

}

function updateStats() {

let count = 0;

let collisions = 0;

state.hashTable.forEach((chain) => {

count += chain.length;

if (chain.length > 1) collisions += chain.length - 1;

});

statCount.textContent = count;

statCollisions.textContent = collisions;

statLoad.textContent = (count / state.tableSize).toFixed(2);

}

function addEntry(key, silent = false) {

const index = calculateHash(key, state.tableSize);

let actionType = 'insert';

let targetId = null;

const chain = state.hashTable[index];

const existingIdx = chain.findIndex((node) => node.key === key);

if (existingIdx !== -1) {

actionType = 'update';

chain[existingIdx].value += 1;

targetId = chain[existingIdx].id;

} else {

const newId = Math.random().toString(36).substr(2, 9);

targetId = newId;

chain.push({ key, value: 1, id: newId });

}

if (!silent) {

state.highlightedIndex = index;

activityLog.innerHTML = `<svg xmlns="http://www.w3.org/2000/svg" class="w-3 h-3 text-indigo-500" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M22 12h-4l-3 9L9 3l-3 9H2"/></svg> Last: ${actionType} "${key}"`;

if (actionType === 'update') {

state.updatedNodeId = targetId;

setTimeout(() => {

state.updatedNodeId = null;

render();

}, 800);

}

render();

setTimeout(() => {

state.highlightedIndex = null;

render();

}, 1000);

}

function render() {

updateStats();

const searchIndex = state.searchKey

? calculateHash(state.searchKey, state.tableSize)

: null;

grid.innerHTML = state.hashTable

.map((chain, index) => {

const isHighlighted = state.highlightedIndex === index;

const isSearchTarget = searchIndex === index;

return `

<span class="text-[8px] font-bold text-slate-400 uppercase">#${index}</span>

<div class="mt-0.5 w-1.5 h-1.5 rounded-full ${chain.length > 0 ? 'bg-indigo-400' : 'bg-slate-300'}"></div>

</div>

</div>

chain.length === 0

? `<div class="h-12 flex items-center text-slate-200 text-[10px] font-mono italic">null</div>`

: chain

.map((node, nodeIdx) => {

const isFound =

state.searchKey &&

node.key === state.searchKey;

const isUpdated =

state.updatedNodeId === node.id;

return `

${nodeIdx === 0 ? 'Head' : 'Node ' + nodeIdx}

</div>

</div>

${node.value}

</span>

</div>

</div>

nodeIdx < chain.length - 1

? `<div class="flex-shrink-0 px-1.5 flex items-center">

</div>

</div>`

: `<div class="flex-shrink-0 px-3 flex items-center text-slate-200 text-[9px] font-mono">/ 0</div>`

}

})

.join('')

}

</div>

})

.join('');

}

// Event Listeners

tableSizeSelect.addEventListener('change', (e) => {

state.tableSize = parseInt(e.target.value);

initTable();

});

searchInput.addEventListener('input', (e) => {

state.searchKey = e.target.value.toLowerCase();

render();

});

addBtn.addEventListener('click', () => {

const word = WORD_LIST[Math.floor(Math.random() * WORD_LIST.length)];

addEntry(word);

});

addTenBtn.addEventListener('click', () => {

for (let i = 0; i < 10; i++) {

const word = WORD_LIST[Math.floor(Math.random() * WORD_LIST.length)];

addEntry(word, i < 9);

}

});

clearBtn.addEventListener('click', () => {

initTable();

});

// Start

initTable();

</script>

</body>

</html>

DataStructureVisualisers/ChainedHashTable.html at main · UCLComputerScience/DataStructureVisualisers · GitHub

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