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Frontend_Web_Development_HTML_CSS_JS: The DOM Examples
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deveshprasad authored Dec 2, 2021
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# Example 1 - Background color changer

![Example 1](./example1.gif)

HTML Code

```html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link rel="stylesheet" href="./randomColor.css"/>
<title>Example1 - Background color changer</title>
</head>
<body>
<div class="content">
<div class="box">
<p>Background Color: <span class="color">RGB(255,255,255)</span></p>
</div>
<button class="changebtn" id="colorbtn">Change!</button>
</div>
<div class="footer">
<p>Made with <span class="heart">&hearts;</span> by <span><a class="github" href="https://github.com/amankumar11">Aman Kumar</a></span> for <span class="gwoc">GWOC'21</span></p>
</div>
<script src="./changeColor.js"></script>
</body>
</html>
```

CSS Code

```css
@import url('https://fonts.googleapis.com/css2?family=Quicksand:wght@500&display=swap');

.content{
display: flex;
flex-direction: column;
align-items: center;
justify-content: center;
text-align: center;
font-family: 'Quicksand', sans-serif;
margin: auto;
position: absolute;
top: 0; left: 0; bottom: 0; right: 0;

}

.box{
background-color: white;
border: 2px solid black;
border-radius: 25px;
padding-left: 10px;
padding-right: 10px;
font-size: 30px;
font-weight: 600;
}

.changebtn{
margin-top: 10px;
padding-top: 10px;
padding-bottom: 10px;
padding-left: 20px;
padding-right: 20px;
background-color: white;
font-family: 'Quicksand', sans-serif;
font-size: 20px;
border-radius: 10px;
}

.changebtn:hover{
background-color: black;
color: white;
}

/* footer */

.footer {
font-family: 'Quicksand', sans-serif;
position: fixed;
left: 0;
bottom: 0;
width: 100%;
background-color: rgba(255, 255, 255, 0.253);
color: black;
text-align: center;
}

.heart{
color: red;
}

.github{
text-decoration: none;
}

.gwoc{
color: tomato;
}
```
Javascript Code

```javascript

const btn = document.getElementById('colorbtn');
const color = document.querySelector('.color');

btn.addEventListener("click", ()=>{

const c1 = getRandom1(255);
const c2 = getRandom2(255);
const c3 = getRandom3(255);
document.body.style.backgroundColor = `rgba(${c1},${c2},${c3})`;
color.textContent = `RGB(${c1},${c2},${c3})`;
color.style.color=`rgba(${c1},${c2},${c3})`;
});

function getRandom1(max){
return Math.floor(Math.random() * max);
}
function getRandom2(max){
return Math.floor(Math.random() * max);
}
function getRandom3(max){
return Math.floor(Math.random() * max);
}
```
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# Example 2 - Counter

![Example 2](./example2.gif)

HTML Code

```html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link rel="stylesheet" href="./counter.css"/>
<title>Example2 - Counter</title>
</head>
<body>
<div class="container">
<!-- <div class="box1">
</div> -->
<div class="box">
<h1>Counter</h1>
<p id="count">0</p>
<div class="buttons">
<button id="decrease">Decrease</button>
<button id="reset">Reset</button>
<button id="increase">Increase</button>
</div>
</div>
</div>
<div class="footer">
<p>Made with <span class="heart">&hearts;</span> by <span><a class="github" href="https://github.com/amankumar11">Aman Kumar</a></span> for <span class="gwoc">GWOC'21</span></p>
</div>
<script src="./counter.js"></script>
</body>
</html>
```
CSS Code

```css
@import url('https://fonts.googleapis.com/css2?family=Quicksand:wght@500&display=swap');

.container{
display: flex;
flex-direction: column;
align-items: center;
justify-content: center;
text-align: center;
font-family: 'Quicksand', sans-serif;
margin: auto;
position: absolute;
top: 0; left: 0; bottom: 0; right: 0;

}

.box{
background-color: white;
border-radius: 25px;
padding-left: 10px;
padding-right: 10px;
font-size: 30px;
font-weight: 600;
}

.box h1{
margin-bottom: 20px;
}

.box p{
font-size: 50px;
margin-top: 15px;
margin-bottom: 40px;
}

.buttons button{
background-color: white;
font-family: 'Quicksand', sans-serif;
padding-right: 20px;
padding-left: 20px;
padding-top: 10px;
padding-bottom: 10px;
font-size: 20px;
margin-right: 15px;
margin-left: 15px;
border-radius: 10px;
}

#decrease{
color: red;
border: 2px solid red;
}

#decrease:hover{
color:white;
background-color: red;
}

#increase{
color: green;
border: 2px solid green;
}

#increase:hover{
color: white;
background-color: green;
}

#reset:hover{
color: white;
background-color: black;
}

/* footer */

.footer {
font-family: 'Quicksand', sans-serif;
position: fixed;
left: 0;
bottom: 0;
width: 100%;
background-color: rgba(255, 255, 255, 0.253);
color: black;
text-align: center;
}

.heart{
color: red;
}

.github{
text-decoration: none;
}

.gwoc{
color: tomato;
}
```
Javascript Code

```javascript
const count = document.getElementById('count');
const decrease = document.getElementById('decrease');
const reset = document.getElementById('reset');
const increase = document.getElementById('increase');
var c = 0;
decrease.addEventListener('click', ()=>{
c--;
count.textContent = c;
});

increase.addEventListener('click', ()=>{
c++;
count.textContent = c;
});

reset.addEventListener('click', ()=>{
c=0;
count.textContent = c;
});

```
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