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JavaScript jQuery Basics (2014) Creating a Simple Drawing Application Perform: Part 3

Sahan Balasuriya
Sahan Balasuriya
10,115 Points
Posted by Sahan Balasuriya
Sahan Balasuriya
10,115 Points

My slider doesn't work the same way

the span element only changes color when I let go of the mouse button, but on the video its shows the color changing as the slider is being dragged across.

//Problem: No user interaction changes causes no change to application
//Solution: When user interacts causes changes appropriately 
var color = $(".selected").css("background-color");

  //When clicking through list items
$(".controls").on("click", "li", function(){
    //Deselect sibiling
  $(this).siblings().removeClass("selected");
    //Select clicked element
  $(this).addClass("selected");    
  //Cache current color
 color = $(this).css("background-color");
});

//When "new color" is pressed
$("#revealColorSelect").click(function(){
  //Show color select or hide the color select
  changeColor();
  $("#colorSelect").toggle();
});

  //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]").change(changeColor);

//when "add color" is presssed 
$("#addNewColor").click(function(){
  //Append the color to controls
  var $newColor = $("<li></li>");
  $newColor.css("background-color", $("#newColor").css("background-color"));
  $(".controls ul").append($newColor)
  //Select the new color
  $newColor.click();
});

//On mouse events on the canvas
  //Drawn Lines

<!DOCTYPE html>
<html>
<head>
    <title>Simple Drawing Application</title>
    <link rel="stylesheet" href="css/style.css" type="text/css" media="screen" title="no title" charset="utf-8">
</head>
<body>
    <canvas width="600" height="400"></canvas>
    <div class="controls">
        <ul>
            <li class="red selected"></li>
            <li class="blue"></li>
            <li class="yellow"></li>
        </ul>
        <button id="revealColorSelect">New Color</button>
        <div id="colorSelect">
            <span id="newColor"></span>
            <div class="sliders">
                <p>
                    <label for="red">Red</label>
                    <input id="red" name="red" type="range" min=0 max=255 value=0>
                </p>
                <p>
                    <label for="green">Green</label>
                    <input id="green" name="green" type="range" min=0 max=255 value=0>
                </p>
                <p>
                    <label for="blue">Blue</label>
                    <input id="blue" name="blue" type="range" min=0 max=255 value=0>
                </p>
            </div>
            <div>
            <button id="addNewColor">Add Color</button>
            </div>
        </div>
    </div>
    <script src="http://code.jquery.com/jquery-1.11.0.min.js" type="text/javascript" charset="utf-8"></script>
    <script src="js/app.js" type="text/javascript" charset="utf-8"></script>    
</body>
</html>

1 Answer

Joe Hartman
Joe Hartman
20,881 Points
Joe Hartman
Joe Hartman
20,881 Points

If you're using Chrome, take a look at the teacher's note right below the video. You'll need to make a change to the input[type=range] line, which is right below the changeColor function.