Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

JavaScript jQuery Basics (2014) Creating a Simple Drawing Application Perform: Part 5

Shunsuke Taguchi
Shunsuke Taguchi
9,380 Points

I followed teacher but my code doesn't work at all. Can someone take a look my code please?

var color = $(".selected").css("background-color");
var $canvas = ("canvas");
var context = $canvas[0].getContext("2d");
var lastEvent;
var mouseDown = false;

//When clicking on control list items
$(".controls").on("click", "li", function(){
   //Deselect sibling elements        
  //Select clicked elements 
  //cache the color
  color = $(this).css("background-color");

//When new color is pressed 
  //show color select or hide color select

//update the new color span
function changeColor() {
  var r = $("#red").val();
  var g = $("#green").val();
  var b = $("#blue").val();
  $("#newColor").css("background-color", "rgb(" + r + "," + g +", " + b + ")");

//when color sliders change
$("input[type=range]").on("input", changeColor);

//when add color is pressed 
  //append the color to the controls ul
  var $newColor = $("<li></li>");
  $newColor.css("background-color", $("#newColor").css("background-color"));
  $(".controls ul").append($newColor);
  //select new color

//On mouth events on the canvas
  lastEvent = e;
  mouseDown = true;
  //Draw lines
  if(mouseDown) {
  context.moveTo(lastEvent.offsetX, lastEvent.offsetY);
  context.lineTo(e.offsetX, e.offsetY);
  context.strokeStyle = color;
  lastEvent = e;
  mouseDown = false;

1 Answer

Steven Parker
Steven Parker
216,148 Points

One little typo...

:point_right: You're missing a dollar-sign on line 2:

var $canvas = $("canvas");
Jacob Tollette
Jacob Tollette
27,864 Points

It's always one little typo...

Shunsuke Taguchi
Shunsuke Taguchi
9,380 Points

Thanks so much, Steven and Jacob!