custom letter avatar directive

2025-12-16 08:13:42 +00:00 · 2017-04-05 23:20:51 -04:00
parent ea5dc4b7fc
commit fe039f7b35
11 changed files with 154 additions and 22 deletions
--- a/src/app/directives/letterAvatarDirective.js
+++ b/src/app/directives/letterAvatarDirective.js
@@ -0,0 +1,144 @@
+angular
+    .module('bit.directives')
+
+    // adaptation of https://github.com/uttesh/ngletteravatar
+    .directive('letterAvatar', function () {
+        // ref: http://stackoverflow.com/a/16348977/1090359
+        function stringToColor(str) {
+            var hash = 0;
+            for (var i = 0; i < str.length; i++) {
+                hash = str.charCodeAt(i) + ((hash << 5) - hash);
+            }
+
+            var color = '#';
+            for (var i = 0; i < 3; i++) {
+                var value = (hash >> (i * 8)) & 0xFF;
+                color += ('00' + value.toString(16)).substr(-2);
+            }
+
+            return color;
+        }
+
+        function getFirstLetters(data, count) {
+            var parts = data.split(' ');
+            if (parts && parts.length > 1) {
+                var text = '';
+                for (var i = 0; i < count; i++) {
+                    text += parts[i].substr(0, 1);
+                }
+                return text;
+            }
+
+            return null;
+        }
+
+        function getSvg(width, height, color) {
+            var svgTag = angular.element('<svg></svg>')
+                .attr({
+                    'xmlns': 'http://www.w3.org/2000/svg',
+                    'pointer-events': 'none',
+                    'width': width,
+                    'height': height
+                })
+                .css({
+                    'background-color': color,
+                    'width': width + 'px',
+                    'height': height + 'px'
+                });
+
+            return svgTag;
+        }
+
+        function getCharText(character, textColor, fontFamily, fontWeight, fontsize) {
+            var textTag = angular.element('<text text-anchor="middle"></text>')
+                .attr({
+                    'y': '50%',
+                    'x': '50%',
+                    'dy': '0.35em',
+                    'pointer-events': 'auto',
+                    'fill': textColor,
+                    'font-family': fontFamily
+                })
+                .text(character)
+                .css({
+                    'font-weight': fontWeight,
+                    'font-size': fontsize + 'px',
+                });
+
+            return textTag;
+        }
+
+        return {
+            restrict: 'AE',
+            replace: true,
+            scope: {
+                data: '@'
+            },
+            link: function (scope, element, attrs) {
+                var params = {
+                    charCount: attrs.charcount || 2,
+                    data: attrs.data,
+                    textColor: attrs.textcolor || '#ffffff',
+                    bgColor: attrs.bgcolor,
+                    height: attrs.height || 45,
+                    width: attrs.width || 45,
+                    fontsize: attrs.fontsize || 20,
+                    fontWeight: attrs.fontweight || 300,
+                    fontFamily: attrs.fontfamily || 'Open Sans, HelveticaNeue-Light, Helvetica Neue Light, ' +
+                    'Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif',
+                    round: attrs.round || 'true',
+                    dynamic: attrs.dynamic || 'true',
+                    class: attrs.class || ''
+                };
+
+                if (params.dynamic === 'true') {
+                    scope.$watch('data', function () {
+                        generateLetterAvatar();
+                    });
+                }
+                else {
+                    generateLetterAvatar();
+                }
+
+                function generateLetterAvatar() {
+                    var c = null,
+                        upperData = scope.data.toUpperCase();
+
+                    if (params.charCount > 1) {
+                        c = getFirstLetters(upperData, params.charCount);
+                    }
+
+                    if (!c) {
+                        c = upperData.substr(0, params.charCount);
+                    }
+
+                    var cobj = getCharText(c, params.textColor, params.fontFamily, params.fontWeight, params.fontsize);
+                    var color = params.bgColor ? params.bgColor : stringToColor(upperData);
+                    var svg = getSvg(params.width, params.height, color);
+                    svg.append(cobj);
+                    var lvcomponent = angular.element('<div>').append(svg).html();
+
+                    var svgHtml = window.btoa(unescape(encodeURIComponent(lvcomponent)));
+                    var src = 'data:image/svg+xml;base64,' + svgHtml;
+
+                    var img = angular.element('<img>').attr({ src: src, title: scope.data });
+
+                    if (params.round === 'true') {
+                        img.css('border-radius', '50%');
+                    }
+
+                    if (params.class) {
+                        img.addClass(params.class);
+                    }
+
+                    if (params.dynamic === 'true') {
+                        element.empty();
+                        element.append(img);
+                    }
+                    else {
+                        element.replaceWith(img);
+                    }
+                }
+            }
+        };
+    });