Using jQuery with WebAssembly (Wasm)

WebAssembly (Wasm) is a binary instruction format for a stack-based virtual machine. It is designed to be a portable target for the compilation of high-level languages like C, C++, and Rust, enabling deployment on the web for client and server applications. WebAssembly aims to execute at native speed by taking advantage of common hardware capabilities.

Key Features of WebAssembly:

High Performance: Runs at near-native speed.
Portability: Runs on any platform that supports WebAssembly.
Security: Provides a sandboxed execution environment.
Interoperability: Works alongside JavaScript and can be used within web applications.

Setting Up Your Environment

To get started with WebAssembly, you need to set up your environment. This involves installing the Emscripten SDK, which compiles C and C++ code to WebAssembly.

Step-by-Step Setup:

Install Emscripten SDK:

				
					git clone https://github.com/emscripten-core/emsdk.git
cd emsdk
./emsdk install latest
./emsdk activate latest
source ./emsdk_env.sh

Verify Installation:

				
					emcc --version

Compiling a Simple C Program to WebAssembly

Let’s start with a simple “Hello, World!” program in C and compile it to WebAssembly.

C Program (hello.c):

				
					#include <stdio.h>

int main() {
    printf("Hello, World!\n");
    return 0;
}

Compile to WebAssembly:

				
					emcc hello.c -o hello.html

This command generates three files: hello.html, hello.js, and hello.wasm.

Integrating WebAssembly with jQuery

To use WebAssembly in a web application, we typically load the .wasm file and interact with it using JavaScript. We’ll integrate this with jQuery to handle DOM manipulation.

HTML and jQuery Integration:

				
					<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>WebAssembly with jQuery</title> <script type="litespeed/javascript" data-src="https://code.jquery.com/jquery-3.6.0.min.js"></script> <script type="litespeed/javascript" data-src="hello.js"></script> </head>
<body>
    <button id="run">Run WebAssembly</button>
    <div id="output"></div> <script type="litespeed/javascript">$(document).ready(function(){$('#run').click(function(){Module.onRuntimeInitialized=function(){Module._main()}})})</script> <script data-no-optimize="1">!function(t,e){"object"==typeof exports&&"undefined"!=typeof module?module.exports=e():"function"==typeof define&&define.amd?define(e):(t="undefined"!=typeof globalThis?globalThis:t||self).LazyLoad=e()}(this,function(){"use strict";function e(){return(e=Object.assign||function(t){for(var e=1;e<arguments.length;e++){var n,a=arguments[e];for(n in a)Object.prototype.hasOwnProperty.call(a,n)&&(t[n]=a[n])}return t}).apply(this,arguments)}function i(t){return e({},it,t)}function o(t,e){var n,a="LazyLoad::Initialized",i=new t(e);try{n=new CustomEvent(a,{detail:{instance:i}})}catch(t){(n=document.createEvent("CustomEvent")).initCustomEvent(a,!1,!1,{instance:i})}window.dispatchEvent(n)}function l(t,e){return t.getAttribute(gt+e)}function c(t){return l(t,bt)}function s(t,e){return function(t,e,n){e=gt+e;null!==n?t.setAttribute(e,n):t.removeAttribute(e)}(t,bt,e)}function r(t){return s(t,null),0}function u(t){return null===c(t)}function d(t){return c(t)===vt}function f(t,e,n,a){t&&(void 0===a?void 0===n?t(e):t(e,n):t(e,n,a))}function _(t,e){nt?t.classList.add(e):t.className+=(t.className?" 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</html>

In this example:

We load jQuery from a CDN.
We load the WebAssembly JavaScript file generated by Emscripten.
We use jQuery to bind a click event to a button, which triggers the WebAssembly module.

Advanced WebAssembly: Calling Functions and Passing Data

For more complex applications, you might want to call specific functions in your WebAssembly module and pass data between JavaScript and WebAssembly.

C Code with Exported Functions (math.c):

				
					#include <emscripten.h>

EMSCRIPTEN_KEEPALIVE
int add(int a, int b) {
    return a + b;
}

EMSCRIPTEN_KEEPALIVE
int multiply(int a, int b) {
    return a * b;
}

Compile to WebAssembly:

				
					emcc math.c -o math.js -s EXPORTED_FUNCTIONS='["_add", "_multiply"]' -s EXTRA_EXPORTED_RUNTIME_METHODS='["ccall", "cwrap"]'

HTML and jQuery Integration:

				
					<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>WebAssembly with jQuery</title> <script type="litespeed/javascript" data-src="https://code.jquery.com/jquery-3.6.0.min.js"></script> <script type="litespeed/javascript" data-src="math.js"></script> </head>
<body>
    <button id="calculate">Calculate</button>
    <div id="output"></div> <script type="litespeed/javascript">$(document).ready(function(){$('#calculate').click(function(){Module.onRuntimeInitialized=function(){let resultAdd=Module.ccall('add','number',['number','number'],[5,3]);let resultMultiply=Module.ccall('multiply','number',['number','number'],[5,3]);$('#output').html(`Add: ${resultAdd}, Multiply: ${resultMultiply}`)}})})</script> <script data-no-optimize="1">!function(t,e){"object"==typeof exports&&"undefined"!=typeof module?module.exports=e():"function"==typeof define&&define.amd?define(e):(t="undefined"!=typeof globalThis?globalThis:t||self).LazyLoad=e()}(this,function(){"use strict";function e(){return(e=Object.assign||function(t){for(var e=1;e<arguments.length;e++){var n,a=arguments[e];for(n in a)Object.prototype.hasOwnProperty.call(a,n)&&(t[n]=a[n])}return t}).apply(this,arguments)}function i(t){return e({},it,t)}function o(t,e){var n,a="LazyLoad::Initialized",i=new t(e);try{n=new CustomEvent(a,{detail:{instance:i}})}catch(t){(n=document.createEvent("CustomEvent")).initCustomEvent(a,!1,!1,{instance:i})}window.dispatchEvent(n)}function l(t,e){return t.getAttribute(gt+e)}function c(t){return l(t,bt)}function s(t,e){return function(t,e,n){e=gt+e;null!==n?t.setAttribute(e,n):t.removeAttribute(e)}(t,bt,e)}function r(t){return s(t,null),0}function u(t){return null===c(t)}function d(t){return c(t)===vt}function f(t,e,n,a){t&&(void 0===a?void 0===n?t(e):t(e,n):t(e,n,a))}function _(t,e){nt?t.classList.add(e):t.className+=(t.className?" 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</html>

In this example:

We define and export two functions in C (add and multiply).
We compile the C code with Emscripten, exporting the functions.
We use Module.ccall to call these functions from JavaScript, passing arguments and receiving the result.
We use jQuery to update the DOM with the results.

Deep Dive: Memory Management and Performance

WebAssembly provides direct access to the linear memory, which can be managed manually. This is crucial for performance-critical applications.

Allocating and Deallocating Memory:

				
					#include <emscripten.h>
#include <stdlib.h>

EMSCRIPTEN_KEEPALIVE
char* allocateMemory(int size) {
    return (char*)malloc(size);
}

EMSCRIPTEN_KEEPALIVE
void deallocateMemory(char* ptr) {
    free(ptr);
}

Compile to WebAssembly:

				
					emcc memory.c -o memory.js -s EXPORTED_FUNCTIONS='["_allocateMemory", "_deallocateMemory"]' -s EXTRA_EXPORTED_RUNTIME_METHODS='["ccall", "cwrap"]'

HTML and jQuery Integration:

				
					<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>WebAssembly with jQuery</title> <script type="litespeed/javascript" data-src="https://code.jquery.com/jquery-3.6.0.min.js"></script> <script type="litespeed/javascript" data-src="memory.js"></script> </head>
<body>
    <button id="allocate">Allocate Memory</button>
    <div id="output"></div> <script type="litespeed/javascript">$(document).ready(function(){$('#allocate').click(function(){Module.onRuntimeInitialized=function(){let size=1024;let ptr=Module.ccall('allocateMemory','number',['number'],[size]);for(let i=0;i<size;i++){Module.HEAP8[ptr+i]=i%256}
let output='Memory: ';for(let i=0;i<10;i++){output+=Module.HEAP8[ptr+i]+' '}
$('#output').html(output);Module.ccall('deallocateMemory',null,['number'],[ptr])}})})</script> <script data-no-optimize="1">!function(t,e){"object"==typeof exports&&"undefined"!=typeof module?module.exports=e():"function"==typeof define&&define.amd?define(e):(t="undefined"!=typeof globalThis?globalThis:t||self).LazyLoad=e()}(this,function(){"use strict";function e(){return(e=Object.assign||function(t){for(var e=1;e<arguments.length;e++){var n,a=arguments[e];for(n in a)Object.prototype.hasOwnProperty.call(a,n)&&(t[n]=a[n])}return t}).apply(this,arguments)}function i(t){return e({},it,t)}function o(t,e){var n,a="LazyLoad::Initialized",i=new t(e);try{n=new CustomEvent(a,{detail:{instance:i}})}catch(t){(n=document.createEvent("CustomEvent")).initCustomEvent(a,!1,!1,{instance:i})}window.dispatchEvent(n)}function l(t,e){return t.getAttribute(gt+e)}function c(t){return l(t,bt)}function s(t,e){return function(t,e,n){e=gt+e;null!==n?t.setAttribute(e,n):t.removeAttribute(e)}(t,bt,e)}function r(t){return s(t,null),0}function u(t){return null===c(t)}function d(t){return c(t)===vt}function f(t,e,n,a){t&&(void 0===a?void 0===n?t(e):t(e,n):t(e,n,a))}function _(t,e){nt?t.classList.add(e):t.className+=(t.className?" 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</html>

In this example:

We define functions to allocate and deallocate memory in C.
We compile the C code to WebAssembly, exporting the functions.
We use Module.HEAP8 to access the allocated memory in JavaScript.
We fill the allocated memory with data, display part of it, and then deallocate the memory.

Integrating jQuery with WebAssembly allows you to leverage the performance benefits of WebAssembly while maintaining the ease of DOM manipulation provided by jQuery. This combination is powerful for creating high-performance web applications. By following these steps and examples, you should have a solid understanding of how to use jQuery with WebAssembly, from basic concepts to advanced techniques. This chapter should serve as a comprehensive guide, making further research unnecessary. Happy coding !❤️

Using jQuery with WebAssembly (Wasm)

Key Features of WebAssembly:

Setting Up Your Environment

Step-by-Step Setup:

Install Emscripten SDK:

Verify Installation:

Compiling a Simple C Program to WebAssembly

C Program (hello.c):

Compile to WebAssembly:

Integrating WebAssembly with jQuery

HTML and jQuery Integration:

Advanced WebAssembly: Calling Functions and Passing Data

C Code with Exported Functions (math.c):

Compile to WebAssembly:

HTML and jQuery Integration:

Deep Dive: Memory Management and Performance

Allocating and Deallocating Memory:

Compile to WebAssembly:

HTML and jQuery Integration:

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