jQuery addClass example

Change class name on click in jQuery

by Amresh Venugopal

HTML

<div id="banner-message">
  <p>Your cart value is Rs 200, do you want to add a tip?</p>
  <label>
  Money:
  <input id="riches" value="" placeholder="Rs 5">    
  </label>
  <button>Pay</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: 18px;
  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;
  margin: 3px;
}

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

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

label {
  font-size: 13px;
}

JavaScript

// find elements
const basePrice = 200
const button = $("button")
const tipInputEl = $("#riches")[0]
const resultEl = $("#result")[0]
const addTip = (n) => `You paid Rs ${n + basePrice}.`


// handle click and add class
button.on("click", function(){
  const tip = tipInputEl.value
  if (tip) {
		resultEl.innerHTML = addTip(tip);  
  }
});