jQuery does not provide the reference of a basic canvas element

I'm having trouble with a simple initialization function that is supposed to create a canvas element in the body and save its reference in a variable.

No matter what I try, jQuery doesn't seem to want to return the reference.

I attempted referencing other HTML elements like the body, but that didn't work either.

What's odd is that when I run $('#Gravity_Canvas') in the Chrome debugger, it does give me the reference.

Below is the code:

function Gravity() {
    this.containerRef = null;
    this.objGroups = null;
    this.objects = new Array();

    init();

    function init() {
        $('body').append('<canvas id="Gravity_Canvas" width="' + window.innerWidth + '" height="' + window.innerHeight + '"> </canvas>');
        this.containerRef = $('#Gravity_Canvas'); // This line seems to be causing issues

        this.objGroups = { 'default': new ObjectGroup() };
    }
}

Any help would be greatly appreciated. Thank you.

javascriptjqueryhtml

Answer №1

To improve your code, consider making the following changes. One suggestion is to create a new variable called "that" in order to avoid confusion between different instances of 'this'. This method ensures that the object references remain consistent throughout the Gravity() function.

function Gravity() {
    var that = this;
    that.containerRef = null;
    that.objGroups = null;
    that.objects = new Array();

    init();

    function init() {
        that.containerRef = $('<canvas id="Gravity_Canvas" width="' + window.innerWidth + '" height="' + window.innerHeight + '"> </canvas>');
        $('body').append(that.containerRef);

        that.objGroups = { 'default': new ObjectGroup() };
    }
}

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