JavaScript

امثلة JavaScript

اترك تعليقاً / Blog, JavaScript

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">!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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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></body>
</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">!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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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></body>
</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>

<ul id="list"></ul> <script type="litespeed/javascript">var fruits=["Apple","Orange","Banana","Grapes"];var list=document.getElementById("list");fruits.forEach(function(fruit){var li=document.createElement("li");li.appendChild(document.createTextNode(fruit));list.appendChild(li)})</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>

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></body>
</html>
JavaScript

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">!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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document.createElement("p"),at=Z&&1<window.devicePixelRatio,it={elements_selector:".lazy",container:tt||Z?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",rt="srcset",ct="sizes",lt="poster",st="llOriginalAttrs",ut="loading",dt="loaded",ft="applied",_t="error",vt="native",gt="data-",bt="ll-status",pt=[ut,dt,ft,_t],ht=[ot],mt=[ot,lt],Et=[ot,rt,ct],It={IMG:function(t,e){m(t,function(t){A(t,Et),x(t,e)}),A(t,Et),x(t,e)},IFRAME:function(t,e){A(t,ht),w(t,ot,l(t,e.data_src))},VIDEO:function(t,e){a(t,function(t){A(t,ht),w(t,ot,l(t,e.data_src))}),A(t,mt),w(t,lt,l(t,e.data_poster)),w(t,ot,l(t,e.data_src)),t.load()}},yt=["IMG","IFRAME","VIDEO"],At={IMG:P,IFRAME:function(t){k(t,ht)},VIDEO:function(t){a(t,function(t){k(t,ht)}),k(t,mt),t.load()}},kt=["IMG","IFRAME","VIDEO"];return 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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></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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