{"id":8336,"date":"2018-12-25T00:24:08","date_gmt":"2018-12-24T16:24:08","guid":{"rendered":"https:\/\/www.zhangxinxu.com\/wordpress\/?p=8336"},"modified":"2019-01-30T00:58:58","modified_gmt":"2019-01-29T16:58:58","slug":"css-placeholder-shown-material-design","status":"publish","type":"post","link":"https:\/\/www.zhangxinxu.com\/wordpress\/2018\/12\/css-placeholder-shown-material-design\/","title":{"rendered":"CSS :placeholder-shown\u4f2a\u7c7b\u5b9e\u73b0Material Design\u5360\u4f4d\u7b26\u4ea4\u4e92\u6548\u679c"},"content":{"rendered":"<p>by <a href=\"https:\/\/www.zhangxinxu.com\/\">zhangxinxu<\/a> from <a href=\"https:\/\/www.zhangxinxu.com\/wordpress\/?p=8336\">https:\/\/www.zhangxinxu.com\/wordpress\/?p=8336<\/a><br \/>\n\u672c\u6587\u53ef\u5168\u6587\u8f6c\u8f7d\uff0c\u4e2a\u4eba\u7f51\u7ad9\u65e0\u9700\u6388\u6743\uff0c\u53ea\u8981\u4fdd\u7559\u539f\u4f5c\u8005\u3001\u51fa\u5904\u4ee5\u53ca\u6587\u4e2d\u94fe\u63a5\u5373\u53ef\uff0c\u4efb\u4f55\u7f51\u7ad9\u5747\u53ef\u6458\u8981\u805a\u5408\uff0c\u5546\u7528\u8bf7\u8054\u7cfb\u6388\u6743\u3002<\/p>\n<p><script>window.wxShareImgUrl = 'https:\/\/www.zhangxinxu.com\/study\/image\/share\/201901-form-label.png';<\/script><\/p>\n<h3>\u4e00\u3001Material Design\u89c4\u8303\u4e2d\u5360\u4f4d\u7b26\u4ea4\u4e92\u6548\u679c<\/h3>\n<p>Material Design\u98ce\u683c\u5360\u4f4d\u7b26\u4ea4\u4e92\u6548\u679c\u5b98\u65b9\u793a\u610f\u89c1\u6b64<a href=\"https:\/\/material-components.github.io\/material-components-web-catalog\/#\/component\/text-field\" rel=\"noopener nofollow\" target=\"_blank\">demo\u9875\u9762<\/a>\u3002<\/p>\n<p>\u6548\u679c\u53ef\u4ee5\u53c2\u89c1\u4e0b\u9762\u7684GIF\u5f55\u5c4f\u793a\u610f\uff1a<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"\/\/image.zhangxinxu.com\/image\/blog\/201812\/placeholder-shown.gif\" width=\"570\" height=\"680\" alt=\"Material Design\u5360\u4f4d\u7b26\u4ea4\u4e92\u622a\u5c4f\u793a\u610f\" class=\"alignnone size-medium\" \/><\/p>\n<p>\u73b0\u5728\u8fd9\u79cd\u8bbe\u8ba1\u5728\u79fb\u52a8\u7aef\u5f88\u5e38\u89c1\uff0c\u56e0\u4e3a\u5bbd\u5ea6\u662f\u7a00\u7f3a\u7684\u3002\u76f8\u4fe1\u4e0d\u5c11\u4eba\u8bbe\u8ba1\u9879\u76ee\u4e2d\u6709\u5b9e\u73b0\u8fc7\u8fd9\u79cd\u4ea4\u4e92\uff0c\u800c\u4e14\uff0c\u6211\u6562\u4fdd\u8bc1\u662f\u5229\u7528JS\u5b9e\u73b0\u7684\u3002<\/p>\n<p>\u5b9e\u9645\u4e0a\uff0c\u6211\u4eec\u53ef\u4ee5\u501f\u52a9CSS :placeholder-shown\u4f2a\u7c7b\uff0c\u7eafCSS\uff0c\u65e0\u4efb\u4f55JS\uff0c\u5b9e\u73b0\u8fd9\u6837\u7684\u5360\u4f4d\u7b26\u4ea4\u4e92\u6548\u679c\u3002<\/p>\n<p>:placeholder-shown\u8868\u793a\uff0c\u5f53\u8f93\u5165\u6846\u7684placeholder\u5185\u5bb9\u663e\u793a\u7684\u65f6\u5019\uff0c\u8f93\u5165\u6846\u5e72\u561b\u5e72\u561b\u3002<\/p>\n<p>:placeholder-shown\u4f2a\u7c7b\u76ee\u524d\u517c\u5bb9\u6027\u5982\u4e0b\uff1a<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"\/\/image.zhangxinxu.com\/image\/blog\/201812\/2018-12-24_223437.png\" width=\"569\" height=\"250\" alt=\":placeholder-shown\u517c\u5bb9\u6027\u622a\u56fe\" class=\"alignnone size-medium\" \/><\/p>\n<p>\u517c\u5bb9\u6027\u8fd8\u662f\u5f88\u4e0d\u9519\u7684\uff0c\u5728\u79fb\u52a8\u7aef\u6211\u4eec\u53ef\u4ee5\u653e\u5fc3\u4f7f\u7528\u3002\u56e0\u4e3a\u5c31\u7b97\u4e00\u4e9b\u8001\u624b\u673a\u4e0d\u652f\u6301\uff0c\u4e5f\u4e0d\u8fc7\u662f\u4f20\u7edf\u7684placeholder\u5360\u4f4d\u7b26\u6548\u679c\uff0c\u5e76\u6ca1\u6709\u4ec0\u4e48\u635f\u5931\u3002<\/p>\n<h3>\u4e8c\u3001:placeholder-shown\u7ecf\u5178\u6848\u4f8b<\/h3>\n<p>\u4e0b\u9762\u5c55\u793a\u4f7f\u7528\u51e0\u4e2a:placeholder-shown\u5b9e\u73b0label\u7279\u6027\u5360\u4f4d\u7b26\u6848\u4f8b\u3002<\/p>\n<p>\u4f60\u53ef\u4ee5\u72e0\u72e0\u5730\u70b9\u51fb\u8fd9\u91cc\uff1a<a href=\"https:\/\/www.zhangxinxu.com\/study\/201812\/placeholder-shown-label-transition-demo.php\" rel=\"noopener\" target=\"_blank\">:placeholder-shown\u5b9e\u73b0\u5360\u4f4d\u7b26\u8fc7\u6e21\u52a8\u753bdemo<\/a><\/p>\n<p>\u4e0b\u9762\u5c31\u662f\u6211\u5b9e\u73b0\u7684demo\u9875\u9762\u4e2d\u7684\u6548\u679c\u56fe\uff08GIF\u52a8\u56fe\uff09\uff1a<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"\/\/image.zhangxinxu.com\/image\/blog\/201812\/placeholder-shown-by-zxx.gif\" width=\"274\" height=\"360\" alt=\"\u5f20\u946b\u65ed\u5b9e\u73b0\u7684\u5360\u4f4d\u7b26\u52a8\u753b\u6548\u679c\" class=\"alignnone size-medium\" \/><\/p>\n<p>\u8f93\u5165\u5185\u5bb9\u529f\u80fd\u4e5f\u662f\u5e03\u5c40\u6548\u679c\u4e5f\u662f\u6b63\u5e38\u7684\uff1a<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"\/\/image.zhangxinxu.com\/image\/blog\/201812\/2018-12-24_234617.png\" width=\"354\" height=\"455\" alt=\"\u8f93\u5165\u5185\u5bb9\u540e\u7684\u6548\u679c\u622a\u56fe\" class=\"alignnone size-medium\" \/><\/p>\n<p>\u7eafCSS\u5b9e\u73b0\uff0c\u8981\u6bd4JS\u5b9e\u73b0\u597d\u4e00\u5343\u500d\uff0c\u4ee3\u7801\u5c11\uff0c\u6027\u80fd\u9ad8\uff0c\u6837\u5f0f\u8c03\u6574\u65b9\u4fbf\uff0c\u4e0a\u624b\u7b80\u5355\u5bb9\u6613\uff0c\u53ef\u8c13\u662f\u524d\u7aef\u5fc5\u5907\u6280\u80fd\u4e86\u3002<\/p>\n<h4>\u5b9e\u73b0\u539f\u7406<\/h4>\n<p>\u62ff\u7b2c\u4e00\u4e2afill\u6a21\u5f0f\u7684\u8f93\u5165\u6846\u4e3e\u4f8b\uff0cHTML\u7ed3\u6784\u5982\u4e0b\uff1a<\/p>\n<pre>&lt;div class=\"input-fill-x\"&gt;\r\n    &lt;input class=\"input-fill\" placeholder=\"\u90ae\u7bb1\"&gt;\r\n    &lt;label class=\"input-label\"&gt;\u90ae\u7bb1&lt;\/label&gt;\r\n&lt;\/div&gt;<\/pre>\n<p><strong>\u9996\u5148\uff0c<\/strong>\u8ba9\u6d4f\u89c8\u5668\u9ed8\u8ba4\u7684placeholder\u6548\u679c\u4e0d\u53ef\u89c1\uff0c\u6211\u4eec\u53ef\u4ee5\u8ba9\u989c\u8272\u900f\u660e\u5373\u53ef\uff0c\u5982\u4e0bCSS\uff1a<\/p>\n<pre><span style=\"color:green;\">\/* \u9ed8\u8ba4placeholder\u989c\u8272\u900f\u660e\u4e0d\u53ef\u89c1 *\/<\/span>\r\n.input-fill:placeholder-shown::placeholder {\r\n    color: transparent;\r\n}<\/pre>\n<p><strong>\u7136\u540e\uff0c<\/strong>\u540e\u9762\u7684<code>.input-label<\/code>\u8fd9\u4e2alabel\u5143\u7d20\u4ee3\u66ff\u6210\u4e3a\u6211\u4eec\u8089\u773c\u770b\u5230\u7684\u5360\u4f4d\u7b26\u3002\u6211\u4eec\u53ef\u4ee5\u91c7\u7528\u7edd\u5bf9\u5b9a\u4f4d\uff1a<\/p>\n<pre>.input-fill-x {\r\n    position: relative;\r\n}\r\n.input-label {\r\n    position: absolute;\r\n    left: 16px; top: 14px;\r\n    pointer-events: none;\r\n}<\/pre>\n<p><strong>\u6700\u540e\uff0c<\/strong>\u5bf9\u8fd9\u4e2alabel\u5143\u7d20\u5728\u8f93\u5165\u6846focus\u65f6\u5019\uff0c\u4ee5\u53ca\u975eplaceholder\u663e\u793a\u7684\u65f6\u5019\u8fdb\u884c\u91cd\u5b9a\u4f4d\uff08\u7f29\u5c0f\u5e76\u4f4d\u79fb\u5230\u4e0a\u65b9\uff09\uff1a<\/p>\n<pre>.input-fill:not(:placeholder-shown) ~ .input-label,\r\n.input-fill:focus ~ .input-label {\r\n    transform: scale(0.75) translate(0, -32px);\r\n}<\/pre>\n<p>\u4e8e\u662f\uff0c\u6548\u679c\u8fbe\u6210\uff01<\/p>\n<p>\u662f\u4e0d\u662f\u8981\u6bd4JS\u5199\u5404\u79cd\u4e8b\u4ef6\uff0c\u5224\u65ad\u5404\u79cd\u573a\u666f\u7b80\u5355\u591a\u4e86\uff1f<\/p>\n<h3>\u4e09\u3001\u8d76\u5feb\u9879\u76ee\u4e2d\u7528\u8d77\u6765\u5427<\/h3>\n<p>\u8d76\u5feb\u9879\u76ee\u4e2d\u7528\u8d77\u6765\u5427\uff01\u6216\u8005\u628a\u8fd9\u4e2a\u6280\u672f\u5206\u4eab\u7ed9\u5176\u4ed6\u5c0f\u4f19\u4f34\u5427~<\/p>\n<p><strong>\u5176\u4ed6<\/strong><\/p>\n<ul>\n<li>demo\u9875\u9762\u8fd8\u4f7f\u7528\u4e86\u5176\u4ed6\u4e00\u4e9bCSS3\u5c5e\u6027\uff0c\u4f8b\u5982\uff0c\u5916\u90e8\u5bb9\u5668\u5bbd\u5ea6\u662f\u8ddf\u7740\u8f93\u5165\u6846\u5bbd\u5ea6\u8d70\u7684\uff0c\u4f7f\u7528\u7684\u662f<a href=\"https:\/\/www.zhangxinxu.com\/wordpress\/?p=5392\">width:fit-content<\/a>\u8fd9\u4e2a\u58f0\u660e\u3002<\/li>\n<li>\u8f93\u5165\u6846focus\u65f6\u5019\u6709\u4e2a\u8fb9\u6846\u52a8\u753b\u6548\u679c\uff0c\u501f\u52a9\u4e86<a href=\"https:\/\/www.zhangxinxu.com\/wordpress\/?p=7327\">:focus-within\u4f2a\u7c7b\u9009\u62e9\u5668<\/a>\uff0c:focus-within\u4f2a\u7c7b\u9009\u62e9\u5668\u4e5f\u662f\u975e\u5e38\u5f3a\u975e\u5e38\u5b9e\u7528\u4ee5\u540e\u4f1a\u5927\u706b\u7684\u9009\u62e9\u5668\uff0c\u5982\u679c\u4e0d\u4e86\u89e3\u7684\u4e00\u5b9a\u8981<a href=\"https:\/\/www.zhangxinxu.com\/wordpress\/?p=7327\">\u8fdb\u884c\u4e86\u89e3<\/a>\u3002<\/li>\n<li>:placeholder-shown\u8fd8\u53ef\u4ee5\u5b9e\u73b0\u4e0b\u9762\u7684\u4ea4\u4e92\uff1a\u8f93\u5165\u6846\u7684\u540e\u9762\uff08\u6216\u4e0b\u65b9\uff09\u4f1a\u6709\u5173\u4e8e\u8f93\u5165\u5185\u5bb9\u7684\u8bf4\u660e\u548c\u63d0\u793a\u4fe1\u606f\uff08\u56e0\u4e3a\u5f88\u957f\uff0cplaceholder\u653e\u4e0d\u4e0b\uff09\uff0c\u5f53\u7528\u6237\u8f93\u5165\u5185\u5bb9\uff0c\u63d0\u793a\u4fe1\u606f\u6d88\u5931\u3002<\/li>\n<\/ul>\n<p>\u597d\uff0c\u672c\u6587\u5c31\u8bf4\u8fd9\u4e48\u591a\uff0c\u6700\u540e\uff0c\u795d\u5927\u5bb6\u5723\u8bde\u5feb\u4e50\uff01<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"\/\/image.zhangxinxu.com\/image\/emtion\/emoji\/1f385.svg\" width=\"20\" height=\"20\" align=\"absmiddle\"><\/p>\n<p>\u672c\u6587\u4e3a\u539f\u521b\u6587\u7ae0\uff0c\u4f1a\u7ecf\u5e38\u66f4\u65b0\u77e5\u8bc6\u70b9\u4ee5\u53ca\u4fee\u6b63\u4e00\u4e9b\u9519\u8bef\uff0c\u56e0\u6b64\u8f6c\u8f7d\u8bf7\u4fdd\u7559\u539f\u51fa\u5904\uff0c\u65b9\u4fbf\u6eaf\u6e90\uff0c\u907f\u514d\u9648\u65e7\u9519\u8bef\u77e5\u8bc6\u7684\u8bef\u5bfc\uff0c\u540c\u65f6\u6709\u66f4\u597d\u7684\u9605\u8bfb\u4f53\u9a8c\u3002<br \/>\n\u672c\u6587\u5730\u5740\uff1a<a href=\"https:\/\/www.zhangxinxu.com\/wordpress\/?p=8336\">https:\/\/www.zhangxinxu.com\/wordpress\/?p=8336<\/a><\/p>\n<p>\uff08\u672c\u7bc7\u5b8c\uff09<\/p>\n","protected":false},"excerpt":{"rendered":"<p><img loading=\"lazy\" decoding=\"async\" src=\"\/\/image.zhangxinxu.com\/image\/blog\/201812\/form-label.png\" width=\"161\" height=\"100\" lazyload=\"on\" alt=\"\u8868\u5355\u4e0elabel\u4e0eplaceholder\" class=\"alignright size-medium\" \/><\/p>\n<p>Material Design\u89c4\u8303\u4e2d\u5360\u4f4d\u7b26\u4ea4\u4e92\u6548\u679c\u662f\u8fd9\u6837\u7684\uff1afocus\u8f93\u5165\u6846\u7684\u65f6\u5019\uff0cplaceholder\u4f1a\u4f4d\u79fb\u5230\u5de6\u4e0a\u89d2\u4f5c\u4e3a\u4e00\u4e2alabel\u5b58\u5728\u3002\u4ee5\u524d\u6211\u4eec\u8981\u5b9e\u73b0\u8fd9\u79cd\u6548\u679c\u53ea\u80fd\u501f\u52a9JavaScript\uff0c\u5b9e\u9645\u4e0a\uff0c\u7eafCSS\u5c31\u80fd\u641e\u5b9a\u4e4b\uff0c\u5c31\u662f\u501f\u52a9:placeholder-shown\u4f2a\u7c7b\u5b9e\u73b0\u3002\u4e14\u76ee\u524d\u5728\u79fb\u52a8\u7aef\u517c\u5bb9\u6027\u4e0d\u9519\uff0c\u53ef\u4ee5\u5728\u5b9e\u9645\u9879\u76ee\u4e2d\u5e94\u7528\u3002\u7a76\u7adf\u5982\u4f55\u5b9e\u73b0\uff1f\u6709\u6ca1\u6709\u8fd9\u4e48\u795e\u5947\uff1f\u4e00\u8d77\u8fdb\u6765\u770b\u770b\u5427~<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[1209,1398,295,1397,548,49,843,676],"_links":{"self":[{"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/posts\/8336"}],"collection":[{"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/comments?post=8336"}],"version-history":[{"count":0,"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/posts\/8336\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/media?parent=8336"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/categories?post=8336"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/tags?post=8336"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}