Letter Avatar

How to easily create Letter Avatars for your comments in Minimal Mistakes. This coversion is a work in progress as I am just learning liquid.

Letter Avatar Original gist

GitHub code as a GitHub Gist, by Lee Crossly

Avatar Generator from - Commenter name 1 as input and a canvas element as output using the initials from the name and a background color.

The background colors are from from Flat Ui Colors Now with retina support.

The Canvas html snippet

<canvas id="user-icon" width="60" height="60"></canvas>

The Code before conversion

var colours = ["#1abc9c", "#2ecc71", "#3498db", "#9b59b6", "#34495e", "#16a085", "#27ae60", "#2980b9", "#8e44ad", "#2c3e50", "#f1c40f", "#e67e22", "#e74c3c", "#ecf0f1", "#95a5a6", "#f39c12", "#d35400", "#c0392b", "#bdc3c7", "#7f8c8d"];

var name = "Lee Crossley",
    nameSplit = name.split(" "),
    initials = nameSplit[0].charAt(0).toUpperCase() + nameSplit[1].charAt(0).toUpperCase();

var charIndex = initials.charCodeAt(0) - 64,
    colourIndex = charIndex % 20;

var canvas = document.getElementById("user-icon");
var context = canvas.getContext("2d");

var canvasWidth = $(canvas).attr("width"),
    canvasHeight = $(canvas).attr("height"),
    canvasCssWidth = canvasWidth,
    canvasCssHeight = canvasHeight;

if (window.devicePixelRatio) {
    $(canvas).attr("width", canvasWidth * window.devicePixelRatio);
    $(canvas).attr("height", canvasHeight * window.devicePixelRatio);
    $(canvas).css("width", canvasCssWidth);
    $(canvas).css("height", canvasCssHeight);
    context.scale(window.devicePixelRatio, window.devicePixelRatio);
}

context.fillStyle = colours[colourIndex - 1];
context.fillRect (0, 0, canvas.width, canvas.height);
context.font = "128px Arial";
context.textAlign = "center";
context.fillStyle = "#FFF";
context.fillText(initials, canvasCssWidth / 2, canvasCssHeight / 1.5);

MVC Implementation

I Still Use Asp.Net Core2 for Mansbooks and use letter avatar with the MVC changes.

Image tag changes for MVC

<img itemprop="image" avatar="@comment.Author" alt="@comment.Author" class="comments-media-object" />

My Script Changes for MVC

    (function (w, d) {
        function LetterAvatar(name, size) {

            name = name || '';
            size = size || 60;

            var colours = [
                    "#1abc9c", "#2ecc71", "#3498db", "#9b59b6", "#34495e", "#16a085", "#27ae60", "#2980b9", "#8e44ad", "#2c3e50",
                    "#f1c40f", "#e67e22", "#e74c3c", "#ecf0f1", "#95a5a6", "#f39c12", "#d35400", "#c0392b", "#bdc3c7", "#7f8c8d"
            ],

                nameSplit = String(name).toUpperCase().split(' '),
                initials, charIndex, colourIndex, canvas, context, dataURI;


            if (nameSplit.length == 1) {
                initials = nameSplit[0] ? nameSplit[0].charAt(0) : '?';
            } else {
                initials = nameSplit[0].charAt(0) + nameSplit[1].charAt(0);
            }

            if (w.devicePixelRatio) {
                size = (size * w.devicePixelRatio);
            }

            charIndex = (initials == '?' ? 72 : initials.charCodeAt(0)) - 64;
            colourIndex = charIndex % 20;
            canvas = d.createElement('canvas');
            canvas.width = size;
            canvas.height = size;
            context = canvas.getContext("2d");

            context.fillStyle = colours[colourIndex - 1];
            context.fillRect(0, 0, canvas.width, canvas.height);
            context.font = Math.round(canvas.width / 2) + "px Arial";
            context.textAlign = "center";
            context.fillStyle = "#FFF";
            context.fillText(initials, size / 2, size / 1.5);

            dataURI = canvas.toDataURL();
            canvas = null;

            return dataURI;
        }

        LetterAvatar.transform = function () {

            Array.prototype.forEach.call(d.querySelectorAll('img[avatar]'), function (img, name) {
                name = img.getAttribute('avatar');
                img.src = LetterAvatar(name, img.getAttribute('width'));
                img.removeAttribute('avatar');
                img.setAttribute('alt', name);
            });
        };

        // AMD support
        if (typeof define === 'function' && define.amd) {

            define(function () { return LetterAvatar; });

            // CommonJS and Node.js module support.
        } else if (typeof exports !== 'undefined') {

            // Support Node.js specific `module.exports` (which can be a function)
            if (typeof module != 'undefined' && module.exports) {
                exports = module.exports = LetterAvatar;
            }

            // But always support CommonJS module 1.1.1 spec (`exports` cannot be a function)
            exports.LetterAvatar = LetterAvatar;

        } else {

            window.LetterAvatar = LetterAvatar;

            d.addEventListener('DOMContentLoaded', function (event) {
                LetterAvatar.transform();
            });
        }

    })(window, document);

Jekyll Liquid Conversion

Super simple and added to my reviews reviews.html

Added to my reviews layout with just a link to avatar=”” + reviewData.name, or if your using comments its commentsData.name

<div itemprop="author" itemscope itemtype="https://schema.org/Person">
    <img itemprop="image" avatar="{{ reviewData.name }}" alt=" {{ reviewData.name }}" class="review-avatar-image text-left" />
    &nbsp;<span itemprop="name">{{ reviewData.name }}</span>
</div>

Add letter-avatar.js

Adding the modified MVC letter-avatar.js to my /assets/js/vendor/letter-avatar/letter-avatar.js.

Link to it in scripts.html

<script src="{{ '/assets/js/vendor/letter-avatar/letter-avatar.js' | absolute_url }}"></script>

Or in a pages markdown frontmatter as.

footer:
  - /assets/js/vendor/letter-avatar/letter-avatar.js

Adding Scripts Site wide in _config.yaml

To add scripts to the head or closing </body> elements by adding paths to following arrays in _config.yml.

head_scripts:
  - https://code.jquery.com/jquery-3.2.1.min.js
  - /assets/js/your-custom-head-script.js

footer_scripts:
  - /assets/js/your-custom-footer-script.js

Then create avatar.scss and register the avatar.scss file in minimal-mistakes.scss, for width, height and rounded images.

  1. based on the first name & surname first letter. 

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