I'm trying to learn the vanilla JS way of toggling a button color with addEventListener. I'm having some trouble understanding how to switch the button back to the original color. Here is my code:
HTML
<h1>Hello</h1>
<section id="container"></section>
CSS
h1 {
font-family: sans;
}
#container {
padding: 2em;
background-color: tomato;
}
#container2 {
padding: 2em;
background-color: blue;
}
JS
var el = document.getElementById('container');
el.addEventListener('click', function() {
this.style.backgroundColor = 'blue';
});
You can restore the declared CSS style by clearing the background color, like this:
this.style.backgroundColor = '';
Fiddle at http://jsfiddle.net/xza5bt0q/
Click the box to toggle the color.
You could check if a color is set and remove it otherwise:
el.addEventListener('click', function() {
if (this.style.backgroundColor == 'blue') {
this.style.backgroundColor = null;
} else {
this.style.backgroundColor = 'blue';
}
});
Try like the given code snippet here
HTML
<div id="toggleArea" class='active'> Toggle area see in class name </div>
<button id="btnToggle"> Toggle Button </button>
JavaScript
const toggleArea = document.getElementById('toggleArea')
const btnToggle = document.getElementById('btnToggle')
btnToggle.addEventListener('click', function() {
if (toggleArea.classList.contains('active')) {
toggleArea.classList.remove("active");
toggleArea.classList.add("disable");
} else {
toggleArea.classList.remove("disable");
toggleArea.classList.add("active");
}
toggleArea.innerHTML = toggleArea.classList[0]
})
I would recommend toggling a CSS class when clicking. Then you can use the class to control color and other properties.
CSS
.container-active {
background-color: blue;
}
JS
var ACTIVE_CLASS = 'container-active'; // define a css class 'constant'
var el = document.getElementById('container');
el.addEventListener('click', function () {
var classes,
idx;
// simplest case: class name is empty
if (this.className === '') {
this.className = ACTIVE_CLASS;
return;
}
// next: class name matches active
if (this.className === ACTIVE_CLASS) {
this.className = '';
return;
}
// otherwise, if more complex, parse and modify classes
classes = this.className.split(' ');
idx = classes.indexOf(activeClass);
if (idx === -1) {
classes.push(activeClass);
} else {
classes.splice(idx, 1);
}
this.className = classes.join(' ');
});
Try the following codes: HTML, CSS, and Javascript.
In this code, the default color of the button is set to be blue. Once you click the button, it changes the background-color to red. If you click it again, the background-color changes to the default ie blue.
HTML
<button id="button" class="blueColor" onclick="toggle()">GET STARTED</button>
CSS
#button{
color: white;
width: 175px;
height: 50px;
border-radius: 5px;
font-family: arial;
font-weight: bold;
word-spacing: 3px;
border: none;
outline: none;
}
.blueColor{
background: blue;
}
.redColor{
background: red;
}
Javascript
<script>
function toggle(){
var colorofbutton = document.querySelector("#button");
if(document.getElementsByClassName("blueColor")[0])
{
colorofbutton.classList.remove('blueColor');
colorofbutton.classList.add('redColor');
}
else
{
colorofbutton.classList.remove('redColor');
colorofbutton.classList.add('blueColor');
}
}
</script>
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