jQuery addClass example

Change class name on click in jQuery

by aborrell

HTML

<div id="banner-message">
  <p>Hello World</p>
  <button>Change color</button>
</div>
<p>
clickit:
<input id="val" type="button" onclick="selopt(this);" value="val3" />
</p>
<div id="id_100">
  <select>
    <option value="val1">Val 1</option>
    <option value="val2">Val 2</option>
    <option value="val3">Val 3</option>
  </select>
</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
var banner = $("#banner-message")
var button = $("button")
var val=$('#val')
// handle click and add class
button.on("click", function(){
  banner.addClass("alt")
})
val.on("click", function(e){
	var v=$('#val').val();
  alert("hola");
  $('#id_100 option[value='+v+']').attr('selected','selected');
})