Search code examples
canvashtml5-canvas

Image Not Loading on Canvas


My issue is that I am having problems loading locally hosted images on to the canvas. I have tried hosting the code on a web server, using XAMPP, and locally, and the LightBlue.jpg image never seems to load. However, when I use an external image from a website the code works perfectly. I have provided an example below.

HTML:

<canvas id="Section1Canvas" width="500" height="95" style="border:1px solid #d3d3d3;">Your browser does not support the HTML5 canvas tag.</canvas>

JAVASCRIPT:

<script>
    var canvas = document.getElementById('Section1Canvas'),
    context = canvas.getContext('2d');
    make_base();
    function make_base()
    {
        base_image = new Image();
        base_image.onload = function()
        {
            context.drawImage(base_image, 10, 10);
        }
        base_image.src = 'images\Selection\Bag\Section1\LightBlue.jpg';
    }
</script>

The script appears just above the closing HTML tag within my code. I have hosted all of the information my webserver and the image still refuses to load.If I were to change the code to the following using a external image the canvas loads the image perfectly:

<script>
    var canvas = document.getElementById('Section1Canvas'),
    context = canvas.getContext('2d');
    make_base();
    function make_base()
    {
        base_image = new Image();
        base_image.onload = function()
        {
            context.drawImage(base_image, 10, 10);
        }
        base_image.src = 'http://www.html5canvastutorials.com/demos/assets/darth-vader.jpg';
    }
</script>

Any guidance would be greatly appreciated.


Solution

  • You were so close!

    You need to put base_image.src after the base_image.onload function:

    <script>
        var canvas  = document.getElementById('Section1Canvas'),
            context = canvas.getContext('2d');
        make_base();
    
        function make_base()
        {
            base_image = new Image();
            base_image.onload = function()
            {
               // test that the image was loaded
               alert(base_image);  // or console.log if you prefer
               context.drawImage(base_image, 10, 10);
            }
            base_image.src = 'images\Selection\Bag\Section1\LightBlue.jpg';
        }
    </script>