javascript - Input range returns undefined -


problem

so, problem <input type="range"> returns undefined on change. in changecheck(), checking <input type="range"> changed.in addbrightness(), outputting value of <input type="range">, when ever changed.

javascript

// variables var canvas = $('#editor')[0]; var ctx = canvas.getcontext('2d');  var img = new image(); img.crossorigin = ''; img.src = '';  var file = $('.file'); var open = $('.open'); var fileopen = $('.file-open');  var control = $("input[type=range]"); var brightness = $('.brightness');  // main $(document).ready(function() {     $(img).on('load', imgload);     $(file).on('click', dropdown);     $(open).on('click', openfile);     $(fileopen).on('change', getpath);      $(control).on('change', checkchange); })  // check change function checkchange() {     if($(this).parent().hasclass('brightness')) {         addbrightness();     } }  // add brightness function addbrightness(val) {     var value = $('brightness').val();      console.log(value);      /*caman('#editor', function () {         this.brightness(value);         this.render();     });*/ }  // dropdown function dropdown() {     $(this).children('ul').slidetoggle(); }  // open file function openfile() {     $(fileopen).click(); }  // file path function getpath(e) {     img.src = url.createobjecturl(e.target.files[0]);      ctx.imagesmoothingenabled = false;     imgload(); }  // load img function imgload() {     if(img.width > 800) {         img.width = 800;          if(img.height > 800) {             img.height = 800;              canvas.width = img.width;             canvas.height = img.height;              ctx.drawimage(img, 0, 0, img.width, img.height);         }     } }

html

<!doctype html> <html> <head>     <title></title>      <!-- stylesheets -->     <link rel="stylesheet" type="text/css" href="assets/css/large.css" media="(min-width:800px)">      <!-- fonts -->     <link href="https://fonts.googleapis.com/css?family=roboto:400,500" rel="stylesheet">      <!-- favicon --> </head> <body>     <nav>         <ul>             <li class="file"><i class="fa fa-file-o" aria-hidden="true"></i> file                 <ul>                     <li class="open"><i class="fa fa-folder-open-o" aria-hidden="true"></i> open</li>                     <li class="save"><i class="fa fa-floppy-o" aria-hidden="true"></i> save</li>                     <li class="exit"><i class="fa fa-sign-out" aria-hidden="true"></i> exit</li>                 </ul>             </li>         </ul>     </nav>      <div class="container">          <center>             <canvas id="editor"></canvas>         </center>          <div class="controls-container">              <!-- brightness -->             <div class="brightness control">                 <h3>brightness</h3>                 <input type="range"  value="50" min="0" max="100">             </div>              <!-- contrest -->             <div class="contrast control">                 <h3>contrast</h3>                 <input type="range"  value="50" min="0" max="100">             </div>              <!-- exposure -->             <div class="exposure control">                 <h3>exposure</h3>                 <input type="range"  value="50" min="0" max="100">             </div>              <!-- sharpen -->             <div class="sharpen control">                 <h3>sharpen</h3>                 <input type="range"  value="0" min="0" max="100">             </div>          </div>      </div>      <input type="file" class="file-open">      <!-- scripts -->     <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>     <script src="http://cdnjs.cloudflare.com/ajax/libs/camanjs/4.0.0/caman.full.min.js"></script>     <script src="https://use.fontawesome.com/e99695fe86.js"></script>     <script src="assets/js/main.js"></script> </body> </html>

you not selecting input brightness correctly. 

var value = $('.brightness>input[type="range"]:first').val();

will work.


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