إليك بعض الأمثلة البسيطة لاستخدام JavaScript داخل صفحات HTML :
1. الطريقة البسيطة لطباعة نص على واجهة المستخدم:
<!DOCTYPE html>
<html>
<head>
<title>JavaScript Example</title>
</head>
<body>
<h1>JavaScript Example</h1>
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</html>
2. حساب العمر باستخدام تاريخ الميلاد:
<!DOCTYPE html>
<html>
<head>
<title>Calculate Age</title>
</head>
<body>
<h1>Calculate Age</h1>
<input type="date" id="birthdate">
<button onclick="calculateAge()">Calculate</button>
<p id="age"></p> <script type="litespeed/javascript">function calculateAge(){var birthdate=document.getElementById("birthdate").value,today=new Date(),age=today.getFullYear()-new Date(birthdate).getFullYear();document.getElementById("age").innerHTML="Your age is: "+age}</script> <script data-no-optimize="1">window.lazyLoadOptions=Object.assign({},{threshold:300},window.lazyLoadOptions||{});!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 o(t){return e({},at,t)}function l(t,e){return t.getAttribute(gt+e)}function c(t){return l(t,vt)}function s(t,e){return function(t,e,n){e=gt+e;null!==n?t.setAttribute(e,n):t.removeAttribute(e)}(t,vt,e)}function i(t){return s(t,null),0}function r(t){return null===c(t)}function u(t){return c(t)===_t}function d(t,e,n,a){t&&(void 0===a?void 0===n?t(e):t(e,n):t(e,n,a))}function f(t,e){et?t.classList.add(e):t.className+=(t.className?" 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</html>
3. إظهار نافذة تاكيد عند النقر علي زر:
<!DOCTYPE html>
<html>
<head>
<title>Confirmation Box</title>
</head>
<body>
<h1>Confirmation Box</h1>
<button onclick="showConfirmation()">Click me</button> <script type="litespeed/javascript">function showConfirmation(){var result=confirm("Are you sure?");if(result){alert("You clicked OK!")}else{alert("You clicked Cancel!")}}</script> <script data-no-optimize="1">window.lazyLoadOptions=Object.assign({},{threshold:300},window.lazyLoadOptions||{});!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 o(t){return e({},at,t)}function l(t,e){return t.getAttribute(gt+e)}function c(t){return l(t,vt)}function s(t,e){return function(t,e,n){e=gt+e;null!==n?t.setAttribute(e,n):t.removeAttribute(e)}(t,vt,e)}function i(t){return s(t,null),0}function r(t){return null===c(t)}function u(t){return c(t)===_t}function d(t,e,n,a){t&&(void 0===a?void 0===n?t(e):t(e,n):t(e,n,a))}function f(t,e){et?t.classList.add(e):t.className+=(t.className?" 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</html>
يمكنك تجربة هذه الأمثلة عبر تشغيلها في محرر HTML أو المتصفح مثل google chrome. إليك مزيدًا من الأمثلة على استخدام JavaScript :
4. إنشاء قائمة ديناميكية:
<!DOCTYPE html>
<html>
<head>
<title>Dynamic List</title>
</head>
<body>
<h1>Dynamic List</h1>
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</html>
5. عرض الوقت الحالي في الوقت الفعلي:
<!DOCTYPE html>
<html>
<head>
<title>Real-time Clock</title>
</head>
<body>
<h1>Real-time Clock</h1>
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d=document.createElement("script");d.addEventListener("load",e),d.addEventListener("error",e),t.getAttributeNames().forEach(e=>{"type"!=e&&d.setAttribute("data-src"==e?"src":e,t.getAttribute(e))});let a=!(d.type="text/javascript");!d.src&&t.textContent&&(d.src=litespeed_inline2src(t.textContent),a=!0),t.after(d),t.remove(),a&&e()}function litespeed_inline2src(t){try{var d=urlCreator.createObjectURL(new Blob([t.replace(/^(?:<!--)?(.*?)(?:-->)?$/gm,"$1")],{type:"text/javascript"}))}catch(e){d="data:text/javascript;base64,"+btoa(t.replace(/^(?:<!--)?(.*?)(?:-->)?$/gm,"$1"))}return d}</script><script data-optimized="1" type="litespeed/javascript" data-src="https://onemoka.com/wp-content/litespeed/js/14a2681c702d30f7741540c7f0377030.js?ver=92f48"></script></body>
</html>
6. تغيير لون الخلفية باستخدام أزرار
<!DOCTYPE html>
<html>
<head>
<title>Change Background Color</title>
</head>
<body>
<h1>Change Background Color</h1>
<button onclick="changeColor('red')">Red</button>
<button onclick="changeColor('green')">Green</button>
<button onclick="changeColor('blue')">Blue</button> <script type="litespeed/javascript">function changeColor(color){document.body.style.backgroundColor=color}</script> <script data-no-optimize="1">window.lazyLoadOptions=Object.assign({},{threshold:300},window.lazyLoadOptions||{});!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 o(t){return e({},at,t)}function l(t,e){return t.getAttribute(gt+e)}function c(t){return l(t,vt)}function s(t,e){return function(t,e,n){e=gt+e;null!==n?t.setAttribute(e,n):t.removeAttribute(e)}(t,vt,e)}function i(t){return s(t,null),0}function r(t){return null===c(t)}function u(t){return c(t)===_t}function d(t,e,n,a){t&&(void 0===a?void 0===n?t(e):t(e,n):t(e,n,a))}function f(t,e){et?t.classList.add(e):t.className+=(t.className?" 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IntersectionObserver(function(t){H(t,e,n)},{root:(t=e).container===document?null:t.container,rootMargin:t.thresholds||t.threshold+"px"}))}function J(t){return Array.prototype.slice.call(t)}function K(t){return t.container.querySelectorAll(t.elements_selector)}function Q(t){return c(t)===ft}function W(t,e){return e=t||K(e),J(e).filter(r)}function X(e,t){var n;(n=K(e),J(n).filter(Q)).forEach(function(t){_(t,e.class_error),i(t)}),t.update()}function t(t,e){var n,a,t=o(t);this._settings=t,this.loadingCount=0,B(t,this),n=t,a=this,Y&&window.addEventListener("online",function(){X(n,a)}),this.update(e)}var Y="undefined"!=typeof window,Z=Y&&!("onscroll"in window)||"undefined"!=typeof navigator&&/(gle|ing|ro)bot|crawl|spider/i.test(navigator.userAgent),tt=Y&&"IntersectionObserver"in window,et=Y&&"classList"in document.createElement("p"),nt=Y&&1<window.devicePixelRatio,at={elements_selector:".lazy",container:Z||Y?document:null,threshold:300,thresholds:null,data_src:"src",data_srcset:"srcset",data_sizes:"sizes",data_bg:"bg",data_bg_hidpi:"bg-hidpi",data_bg_multi:"bg-multi",data_bg_multi_hidpi:"bg-multi-hidpi",data_poster:"poster",class_applied:"applied",class_loading:"litespeed-loading",class_loaded:"litespeed-loaded",class_error:"error",class_entered:"entered",class_exited:"exited",unobserve_completed:!0,unobserve_entered:!1,cancel_on_exit:!0,callback_enter:null,callback_exit:null,callback_applied:null,callback_loading:null,callback_loaded:null,callback_error:null,callback_finish:null,callback_cancel:null,use_native:!1},ot="src",it="srcset",rt="sizes",ct="poster",lt="llOriginalAttrs",st="loading",ut="loaded",dt="applied",ft="error",_t="native",gt="data-",vt="ll-status",bt=[st,ut,dt,ft],pt=[ot],ht=[ot,ct],mt=[ot,it,rt],Et={IMG:function(t,e){h(t,function(t){y(t,mt),O(t,e)}),y(t,mt),O(t,e)},IFRAME:function(t,e){y(t,pt),A(t,ot,l(t,e.data_src))},VIDEO:function(t,e){a(t,function(t){y(t,pt),A(t,ot,l(t,e.data_src))}),y(t,ht),A(t,ct,l(t,e.data_poster)),A(t,ot,l(t,e.data_src)),t.load()}},It=["IMG","IFRAME","VIDEO"],yt={IMG:j,IFRAME:function(t){L(t,pt)},VIDEO:function(t){a(t,function(t){L(t,pt)}),L(t,ht),t.load()}},Lt=["IMG","IFRAME","VIDEO"];return 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Delayed"),litespeed_ui_events.forEach(e=>{window.removeEventListener(e,litespeed_load_delayed_js_force,{passive:!0})}),document.querySelectorAll("iframe[data-litespeed-src]").forEach(e=>{e.setAttribute("src",e.getAttribute("data-litespeed-src"))}),"loading"==document.readyState?window.addEventListener("DOMContentLoaded",litespeed_load_delayed_js):litespeed_load_delayed_js()}litespeed_ui_events.forEach(e=>{window.addEventListener(e,litespeed_load_delayed_js_force,{passive:!0})});async function litespeed_load_delayed_js(){let t=[];for(var d in document.querySelectorAll('script[type="litespeed/javascript"]').forEach(e=>{t.push(e)}),t)await new Promise(e=>litespeed_load_one(t[d],e));document.dispatchEvent(new Event("DOMContentLiteSpeedLoaded")),window.dispatchEvent(new Event("DOMContentLiteSpeedLoaded"))}function litespeed_load_one(t,e){console.log("[LiteSpeed] Load ",t);var d=document.createElement("script");d.addEventListener("load",e),d.addEventListener("error",e),t.getAttributeNames().forEach(e=>{"type"!=e&&d.setAttribute("data-src"==e?"src":e,t.getAttribute(e))});let a=!(d.type="text/javascript");!d.src&&t.textContent&&(d.src=litespeed_inline2src(t.textContent),a=!0),t.after(d),t.remove(),a&&e()}function litespeed_inline2src(t){try{var d=urlCreator.createObjectURL(new Blob([t.replace(/^(?:<!--)?(.*?)(?:-->)?$/gm,"$1")],{type:"text/javascript"}))}catch(e){d="data:text/javascript;base64,"+btoa(t.replace(/^(?:<!--)?(.*?)(?:-->)?$/gm,"$1"))}return d}</script><script data-optimized="1" type="litespeed/javascript" data-src="https://onemoka.com/wp-content/litespeed/js/14a2681c702d30f7741540c7f0377030.js?ver=92f48"></script></body>
</html>
جرّب تشغيل هذه الأمثلة باستخدام visual studio code لتفهم كيف يمكن استخدام JavaScript لتحسين وظائف صفحات الويب.
ملحوظة : يمكنك تغيير العلامات double”” بالعلامات single ” في حاله اي من الامثلة لا تعمل معك
امثلة متقدمة JavaScript
Promises و Async/Await:
- تستخدام لإدارة العمليات الغير متزامنة بشكل فعّال، مما يسمح بتنظيم الشفرة وتجنب الرموز المتشعبة (Callback Hell).
function getDataWithPromise() {
return new Promise((resolve, reject) => {
fetch('https://api.example.com/data')
.then(response => {
if (!response.ok) {
throw new Error('Network response was not ok.');
}
return response.json();
})
.then(data => {
resolve(data);
})
.catch(error => {
reject(error);
});
});
}
// استخدام الوعد
getDataWithPromise()
.then(data => {
console.log('البيانات:', data);
})
.catch(error => {
console.error('حدث خطأ:', error);
});
ES6 Destructuring:
- استخدام تفكيك الكائنات والمصفوفات لتعيين القيم بشكل مباشر، مما يجعل الشفرة أكثر قراءة وفعالية.
// Destructuring objects
const { firstName, lastName } = person;
// Destructuring arrays
const [first, second, , fourth] = myArray;
Higher Order Functions:
- استخدام الدوال العليا لتمريرها كمعلمة أو إرجاعها من أخرى، مما يُمكّن التعامل معها بشكل ديناميكي.
function higherOrderFunction(callback) {
// Perform some operations
callback();
}
function myCallback() {
console.log('This is a callback function');
}
higherOrderFunction(myCallback);
التعامل مع DOM بشكل ديناميكي:
- استخدام JavaScript لتحكم في العناصر والمحتوى داخل صفحة الويب بشكل ديناميكي.
const element = document.getElementById('myElement');
element.style.color = 'red';
function createNewElement() {
const newElement = document.createElement('div');
newElement.textContent = 'New content';
document.body.appendChild(newElement);
}
Generators:
- تستخدام لإنشاء دوال قابلة للإيقاف وإنتاج قيم على مراحل. مثال:
function* generator() {
yield 1;
yield 2;
yield 3;
}
const gen = generator();
console.log(gen.next().value); // 1
console.log(gen.next().value); // 2
console.log(gen.next().value); // 3
Proxy Objects:
- تستخدام لإضافة سلوك مخصص عند الوصول إلى الخصائص أو التعامل مع الكائنات او يمكنك الرجوع الي JavaScript مثـــــــــــــال :
const handler = {
get: function(target, prop) {
return prop in target ? target[prop] : 'Property does not exist';
}
};
const proxyObj = new Proxy({ name: 'John' }, handler);
console.log(proxyObj.name); // John
console.log(proxyObj.age); // Property does not exist
Asynchronous Iteration:
- تستخدام لتمثيل العناصر بشكل متسلسل عبر الوقت. مثال:
const delay = ms => new Promise(resolve => setTimeout(resolve, ms));
const asyncIterable = {
async *[Symbol.asyncIterator]() {
for (let i = 1; i <= 5; i++) {
await delay(1000);
yield i;
}
}
};
(async () => {
for await (const num of asyncIterable) {
console.log(num);
}
})();
WebSockets:
- تستخدام لإنشاء اتصال ثنائي الاتجاه بين العميل والخادم لتبادل البيانات في الوقت الفعلي.
const socket = new WebSocket('wss://example.com');
socket.addEventListener('open', () => {
console.log('Connected to server');
});
socket.addEventListener('message', event => {
console.log('Received message:', event.data);
});
socket.send('Hello Server');
هذه أمثلة متقدمة في JavaScript تُظهر الاستخدام الفعّال والقوي لبعض الميزات المتقدمة في اللغة. تلك الأدوات والمفاهيم تساعد على كتابة شفرة أكثر تنظيمًا وفعالية وديناميكية في تطوير تطبيقات الويب.
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