上面由WordPress技术栏目给各人引见对于用字母代替图片剧本:LetterAvatar,心愿对需求的冤家有所协助!
基于canvas,经过toDataURL静态天生base64图片。今朝我主题的Gravatar头像,就是行使这个LetterAvatar剧本完成未设置Gravatar头像则读取ALT标签,主动天生首字图片代替默许的头像图片。
以前已有WP喜好者制造了一款:mk-letter-avatar 字母头像插件,试了一下很好用,不外关上阅读器开者对象发现孕育发生年夜量404谬误,看了一下源代码,该插件是经过无头像前往404谬误,触发onerror事情用主动天生的字母图片交换src图片地点,判别形式没有是很正当,假如没有是由于个缺陷我都想间接拿来用了,假如作者再优化一下,相对是款优秀适用的插件。
我的完成原理以及插件没有同,合营头像内陆缓存性能,判别无头像后,间接为无头像的图片增加特定的class类,而后经过LetterAvatar剧本交换图片。
需求留意的是下面提到的插件,Gravatar头像图片必需有alt标签属性,不然没有会天生失常的图片,惋惜年夜局部主题默许Gravatar头像alt标签属性是空的.....
假如想主动为Gravatar头像增加alt标签属性,能够将上面的代码增加到以后主题函数模板functions.php中:
function zm_gravatar_alt($altgravatar) { if (have_co妹妹ents()) { $alt = get_co妹妹ent_author(); } else { $alt = get_the_author_meta('display_name'); } $altgravatar= str_replace('alt=\'\'', 'alt=\'' . $alt . '\' title=\'Gravatar for ' . $alt . '\'', $altgravatar); return $altgravatar; } add_filter('get_avatar', 'zm_gravatar_alt');
之后,主动将评论者昵称做为alt属性。
本文只是本人做个记载,并非教各人怎样弄这个头像,假如以为这字母头像还没有错,请间接应用下面引见的插件。
另附LetterAvatar剧本演示代码:
<!DOCTYPE html> <html> <h1>Letter Avatar</h1> <small><strong>用法:</strong></small> <pre> <code><img src="" class="avatar photo" width="256" height="256" alt="知更鸟" color="#c40000"></code> </pre> <img src="" class="avatar photo" height="240" width="240" alt="知更鸟" color="#c40000" /> <img src="" class="avatar photo" height="240" width="240" alt="更鸟" color="#99CC66" /> <img src="" class="avatar photo" height="240" width="240" alt="鸟" color="#0D8ABC" /> <style> body { font-family: "Helvetica Neue", Helvetica, Arial, sans-serif; } pre { margin: 20px 0; padding: 20px; background: #fafafa; } .avatar { border-radius: 50%; } </style> <script src="https://libs.百度.com/jquery/3.2.1/jquery.min.js "></script> <script> /* * LetterAvatar * * Artur Heinze * Create Letter avatar based on Initials * based on https://gist.github.com/leecrossley/6027780 */ (function(w, d){ function LetterAvatar (name, size, color) { 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).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 = color ? color : 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[alt]'), function(img, name, color) { name = img.getAttribute('alt'); color = img.getAttribute('color'); img.src = LetterAvatar(name, img.getAttribute('width'), color); img.removeAttribute('avatar'); img.setAttribute('alt', name); }); }; // AMD support if (typeof define === 'function' && define.amd) { define(function () { return LetterAvatar; }); // Co妹妹onJS 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 Co妹妹onJS 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); </script> </html>
原名目地点:https://github.com/daolavi/LetterAvatar
保举教程:《WordPress》
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