jQuery addClass example

Change class name on click in jQuery

by litespeedtdf

HTML

<div id="banner-message">
  <p>Options</p>
  <select id="lstNumbers">
  <option>1</option>
  <option>2</option>
  <option>3</option>
  <option>4</option>
  <option>5</option>
  <option>6</option>
  <option>7</option>
  <option>8</option>
  <option>9</option>
  <option>10</option>
  </select>
  <button id="processBtn">Run</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(){
//var temp = $('#lstNumbers > option').length;
// console.log('There are ' + temp + ' options');
var numbersArray = [];
$('#lstNumbers > option').each(function(index, item){
	numbersArray.push(item.value);
});
 
 var selectedValue = $('#lstNumbers > option:selected').val();
 console.log('Selected value is: ' + selectedValue);
 //selectedValue = 100;
 var valueFound = jQuery.grep(numbersArray, function(item,index){
 		return  parseInt(item,10) ===  parseInt(selectedValue,10);
 });
 console.log(valueFound.length);
 var result =   parseInt(valueFound,10) === parseInt(selectedValue,10)? true: false ;
 console.log('Was selected value found: ' + result);
 
 //var optionsArray = $('#lstNumbers > option');
 //console.log(optionsArray);

 
})