jQuery addClass example

Change class name on click in jQuery

by queryj

HTML

<div id="banner-message">
  Age: <input type="text" />
  <p>Hello World</p>
  <button>Change color</button>
</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")

// handle click and add class
button.on("click", function() {
  banner.addClass("alt")



})

$("input").on("blur", function() {
  var n = parseFloat($(this).val(), 10);
  if (typeof n == "number" && isFinite(n)) {
    console.log("valid number");
  } else {
    console.log("invalid number");
  }

  $("p").html("age is " + n);

});

$("button").on("click", function(){
   $("p.pee").remove();
   $("p").after($("<p/>").html("yeah man.").addClass("pee"));
})