jQuery addClass example

Change class name on click in jQuery

by Amresh Venugopal

HTML

<div id="banner-message">
  <p>Hello World</p>
  <input id="name" value="" placeholder="your name">
  <input id="age" value="" placeholder="your age">
  <button>Know your age</button>
  <div id="result"></div>
</div>

CSS

body {
  background: #20262E;
  padding: 20px;
  font-family: Helvetica;
}

#banner-message {
  background: #fff;
  border-radius: 4px;
  padding: 20px;
  font-size: 25px;
  text-align: center;
  transition: all 0.2s;
  margin: 0 auto;
  width: 300px;
}

button {
  background: #0084ff;
  border: none;
  border-radius: 5px;
  padding: 8px 14px;
  font-size: 15px;
  color: #fff;
}

#banner-message.alt {
  background: #0084ff;
  color: #fff;
  margin-top: 40px;
  width: 200px;
}

#banner-message.alt button {
  background: #fff;
  color: #000;
}

JavaScript

// find elements
const button = $("button")
const nameInputEl = $("#name")[0]
const ageInputEl = $("#age")[0]
const resultEl = $("#result")[0]

const getAgeAfterNYears = n => (name, age) => `Wow ${name}! you will be ${age + n} years old after ${n} years.`


// handle click and add class
button.on("click", function(){
  const name = nameInputEl.value
  const age = ageInputEl.value
  if (name && age) {
		resultEl.innerHTML = getAgeAfterNYears(5)(name, age);  
  }
})