{"id":2829,"date":"2012-12-11T18:27:05","date_gmt":"2012-12-11T10:27:05","guid":{"rendered":"http:\/\/www.zhangxinxu.com\/wordpress\/?p=2829"},"modified":"2018-07-02T11:51:08","modified_gmt":"2018-07-02T03:51:08","slug":"js-get-html5-boolean-attribute-property-required","status":"publish","type":"post","link":"https:\/\/www.zhangxinxu.com\/wordpress\/2012\/12\/js-get-html5-boolean-attribute-property-required\/","title":{"rendered":"HTML5 Boolean\u7c7b\u578b\u5c5e\u6027(\u5982required)\u503c\u7684JS\u83b7\u53d6"},"content":{"rendered":"

by zhangxinxu<\/a> from http:\/\/www.zhangxinxu.com<\/a>
\n\u672c\u6587\u5730\u5740\uff1ahttp:\/\/www.zhangxinxu.com\/wordpress\/?p=2829<\/a><\/p>\n

\u6211\u4ecd\u5728\u4e0b\u68cb\uff0c\u6211\u4e0d\u53eb\u5c24\u52c7\u3002<\/p>\n

\u672c\u6587\u6700\u6700\u5173\u952e\u5b57\u2014\u2014\u517c\u5bb9\u6027<\/strong>\u3002<\/p>\n

\u7bc7\u7bc7\u6587\u7ae0\u50cf\u8001\u592a\u592a\u88f9\u811a\u5e03\u4e00\u6837\uff0c\u81ea\u5df1\u4e5f\u53d7\u4e0d\u4e86\uff0c\u7b80\u6d01\u7b80\u6d01\u3002<\/p>\n

\u4e00\u3001\u5355\u5200\u76f4\u5165\uff0c\u5f00\u95e8\u89c1\u5c71<\/h3>\n
\n
<input required \/>\n<input \/><\/pre>\n<\/div>\n
\u5206\u522b\u4f7f\u7528:
\njQuery1.4.4 attr(\"required\")<\/code>,
\njQuery1.6.3 attr(\"required\")<\/code>,
\njQuery1.8.3 prop(\"required\")<\/code>,
\nMooTools1.4 getProperty(\"required\")<\/code>, \u4ee5\u53ca
\n\u539f\u751fJS getAttribute(\"required\")<\/code>\u7684\u8fd4\u56de\u503c\u662f\uff1f\uff1f<\/p>\n
\u7ed3\u679c\u89c1\u4e0b\u8868\uff08   <\/span>\u8868\u793abug,    <\/span>\u8868\u793a\u4e0d\u51c6\u786e\uff0c\u4e0b\u540c\uff09\uff1a<\/p>\n
\n\n\n\n\n\n\n\n\n\n
required\/\u7a7a<\/em><\/th>\njQuery 1.4.4 Attr() – demo<\/a><\/th>\njQuery 1.6.3 Attr() – demo<\/a><\/th>\njQuery 1.8.3 Prop() – demo<\/a><\/th>\nMooTools 1.4 getProperty() – demo<\/a><\/th>\nJS getAttribute() – demo<\/a><\/th>\n<\/tr>\n
IE6<\/th>\n\u7a7a\u5b57\u7b26\u4e32\/undefined<\/td>\nrequired\/undefined<\/td>\n\u7a7a\u5b57\u7b26\u4e32\/undefined<\/td>\n\u7a7a\u5b57\u7b26\u4e32\/null<\/td>\n\u7a7a\u5b57\u7b26\u4e32\/null<\/td>\n<\/tr>\n
IE10\u2198IE7| \u540c\u73af\u5883\u4e0b\u641c\u72d7\u517c\u5bb9<\/th>\nundefined<\/span>\/undefined<\/td>\nrequired\/required<\/span><\/td>\nundefined<\/span>\/undefined<\/td>\n-1<\/span>\/null<\/td>\nnull<\/span>\/null<\/td>\n<\/tr>\n
IE9\u2198IE7|IE8\u2198IE7 |ieTester IE7<\/th>\n\u7a7a\u5b57\u7b26\u4e32\/undefined<\/td>\nrequired\/undefined<\/td>\n\u7a7a\u5b57\u7b26\u4e32\/undefined<\/td>\n\u7a7a\u5b57\u7b26\u4e32\/null<\/td>\n\u7a7a\u5b57\u7b26\u4e32\/null<\/td>\n<\/tr>\n
IE10\u2198IE8<\/th>\nrequired\/undefined<\/td>\nrequired\/undefined<\/td>\nundefined<\/span>\/undefined<\/td>\nrequired<\/span>\/null<\/td>\nrequired<\/span>\/\u7a7a\u5b57\u7b26\u4e32<\/span><\/td>\n<\/tr>\n
IE8|IE9\u2198IE8| ieTester IE8<\/th>\nrequired\/undefined<\/td>\nrequired\/undefined<\/td>\n\u7a7a\u5b57\u7b26\u4e32\/undefined<\/td>\n\u7a7a\u5b57\u7b26\u4e32\/null<\/td>\n\u7a7a\u5b57\u7b26\u4e32\/null<\/td>\n<\/tr>\n
IE9 All<\/th>\n\u7a7a\u5b57\u7b26\u4e32\/undefined<\/td>\nrequired\/undefined<\/td>\nundefined<\/span>\/undefined<\/td>\n\u7a7a\u5b57\u7b26\u4e32\/null<\/td>\n\u7a7a\u5b57\u7b26\u4e32\/null<\/td>\n<\/tr>\n
IE10|FireFox17| Chrome21|Opera12<\/th>\ntrue\/false <\/td>\nrequired\/undefined<\/td>\ntrue\/false<\/td>\n\u7a7a\u5b57\u7b26\u4e32\/null<\/td>\n\u7a7a\u5b57\u7b26\u4e32\/null<\/td>\n<\/tr>\n<\/table>\n<\/div>\n
\u6ce8\uff1a1. IE10\u2198IE7\u8868\u793aIE10\u6d4f\u89c8\u5668\u4e0bIE7\u6a21\u5f0f\u3002
\n<\/p>\n
2. \u6700\u65b0\u7684jQuery 1.8.3\u4e0e1.6\u7248\u672c\u6d4b\u8bd5\u7ed3\u679c\u4e00\u81f4\uff0c\u8fd9\u91cc\u672a\u5c55\u793a\uff0c\u53ef\u4ee5\u70b9\u51fb\u8fd9\u91cc<\/a>\u67e5\u770b\u3002
\n3. jQuery prop()\u65b9\u6cd5\u66f4\u60e8\uff01\u751a\u81f3\u539f\u751f\u7684IE9\u6d4f\u89c8\u5668\u90fd\u5927bug\uff01<\/p>\n
\u8868\u683c\u5982\u67d3\u574a\uff0c\u53ef\u89c1\u517c\u5bb9\u6027\u60e8\u4e0d\u5fcd\u7779\uff01<\/p>\n
\u5c24\u5176IE10\u6d4f\u89c8\u5668\u4e0b\uff0cIE7\/IE8\u6a21\u5f0f<\/span>\uff0c\u7c7b\u4f3crequired\u5c5e\u6027\u503c\u83b7\u53d6\uff0c\u5b58\u5728N\u591a\u4e4b\u524d\u4ece\u672a\u6709\u8fc7\u7684\u6bc1\u706d\u6253\u51fb\u3002<\/p>\n
\u8fdejQuery\u5927\u795e\u4e5f\u80cc\u540e\u4e2d\u4e86\u4e00\u67aa\uff1a
\n\"jQuery\u8868\u793a\uff0c\u6211\u670d\u4e86\uff0cIE10\u2198IE7<\/p>\n
\u4e8c\u3001\u6362\u4e2a\u5f62\u5f0f\uff0c\u5bfb\u627e\u5b89\u6170<\/h3>\n
\u6211\u5c31\u7422\u78e8\uff0c\u662f\u4e0d\u662f\u56e0\u4e3a\u662fHTML5\u7684Boolean\u4e66\u5199\u5f62\u5f0f\u7684\u539f\u56e0\uff0c\u4e8e\u662f\uff0c\u6539\u6210\u4e86\u5982\u4e0b\u7ee7\u7eed\u6d4b\u8bd5\uff1a<\/p>\n
\n
<input required=\"required\" \/><\/pre>\n<\/div>\n
\u7ed3\u679c\u89c1\u4e0b\u8868\uff1a<\/p>\n
\n\n\n\n\n\n\n\n\n\n
required=required<\/em> – demo<\/a><\/th>\njQuery 1.4.4 Attr()<\/th>\njQuery 1.6.3 Attr()<\/th>\nMooTools 1.4 getProperty()<\/th>\nJS getAttribute()<\/th>\n<\/tr>\n
IE6<\/th>\nrequired<\/td>\nrequired<\/td>\nrequired<\/td>\nrequired<\/td>\n<\/tr>\n
IE10\u2198IE7| \u540c\u73af\u5883\u4e0b\u641c\u72d7\u517c\u5bb9<\/th>\nundefined<\/span><\/td>\nrequired<\/td>\n-1<\/span><\/td>\nnull<\/span><\/td>\n<\/tr>\n
IE9\u2198IE7|IE8\u2198IE7 |ieTester IE7<\/th>\nrequired<\/td>\nrequired<\/td>\nrequired<\/td>\nrequired<\/td>\n<\/tr>\n
IE10\u2198IE8<\/th>\nrequired<\/td>\nrequired<\/td>\nrequired<\/td>\nrequired<\/td>\n<\/tr>\n
IE8|IE9\u2198IE8 |ieTester IE8<\/th>\nrequired<\/td>\nrequired<\/td>\nrequired<\/td>\nrequired<\/td>\n<\/tr>\n
IE9 All<\/th>\nrequired<\/td>\nrequired<\/td>\nrequired<\/td>\nrequired<\/td>\n<\/tr>\n
IE10|FireFox17 |Chrome21|Opera12<\/th>\ntrue<\/td>\nrequired<\/td>\nrequired<\/td>\nrequired<\/td>\n<\/tr>\n<\/table>\n<\/div>\n
\u54e6\uff0c\u5356\u7cd5\u7684\uff01IE10\u4e0bIE7\u6a21\u5f0f\u4f9d\u7136\u662f\uff0c\u7ed3\u679c\u4e00\u6a21\u4e00\u6837\uff0c\u770b\u6765\u4e0e\u4e66\u5199\u5f62\u5f0f\u65e0\u5173~~<\/p>\n
\u5199\u63d2\u4ef6\u554a\u4ec0\u4e48\u7684\uff0c\u80af\u5b9a\u8981\u5411\u4e0b\u517c\u5bb9\u7684\uff0c\u56e0\u6b64\uff0c\u5373\u4f7f1.6.x\u6709\u6a21\u6709\u6837\uff0c\u7531\u4e8e1.4.x\u62d6\u4e86\u540e\u817f\uff0c\u4e5f\u4e0d\u80fd\u76f4\u63a5\u4f7f\u7528attr()\u83b7\u53d6\uff0c\u5509\uff0cjQuery\u6253\u9171\u6cb9\u4e86\uff01\uff01<\/p>\n
jQuery\u9171\uff0c\u4e0d\u8981\u6851\u5fc3\uff1b\u770bMooTools\u541b\u4e5f\u6302\u5f69\u966a\u7740\u4f60\u561e\uff01
\n<\/p>\n
\u4e09\u3001\u81ea\u5df1\u52a8\u624b\uff0c\u517c\u5bb9\u5904\u7406<\/h3>\n
\u4ee5\u53caJS\u6846\u67b6\u4e2d\u81ea\u5e26\u65b9\u6cd5\u6216\u539f\u751f\u65b9\u6cd5\u4e0d\u80fd\u201c\u4e00\u65b9\u901a\u884c\u201d\uff0c\u90a3\u5c31\u5728\u5176\u57fa\u7840\u4e0a\uff0c\u5bf9\u7167\u6d4b\u8bd5\u6570\u636e\uff0c\u81ea\u5df1\u52a8\u624b\uff0c\u4e30\u8863\u8db3\u98df\u3002<\/p>\n
jQuery\u4e0b\u7684\u5904\u7406<\/strong><\/p>\n
\n
(function($, undefined) {\n    $.fn.isRequired = function() {\n        var required;\n        if (document.querySelector) {\n            required = $(this).attr(\"required\");\n            if (required === undefined || required === false) {\n                return undefined;\n            }\n            return \"required\";\n        } else {\n            \/\/ IE6, IE7<\/span>\n            var outer = $(this).get(0).outerHTML, part = outer.slice(0, outer.search(\/\\\/?['\"]?>(?![^<]*<['\"])\/));\n            return \/\\srequired\\b\/i.test(part)? \"required\": undefined;    \n        }\n    };    \n})(jQuery);<\/pre>\n<\/div>\n
\u4e5f\u53ef\u4ee5\u8f7b\u8f7b\u5730\u70b9\u51fb\u8fd9\u91cc\u67e5\u770b\uff1ajquery-isRequired.js<\/a><\/p>\n
\u4e8e\u662f\uff08\u8fd4\u56de\u503c\u7c7b\u578b\u4e0ejQuery attr()<\/code>\u65b9\u6cd5\u9760\u9f50\uff09\uff1a<\/p>\n
\n
console.log($(\"#input\").isRequired());    \/\/ required\u6216undefined<\/span><\/pre>\n<\/div>\n
MooTools\u4e0b\u7684\u5904\u7406<\/strong>
\nMooTools\u7684\u5904\u7406\u8981\u7b80\u5355\u7684\u591a\uff0c\u4ed4\u7ec6\u5bf9\u6bd4\u6d4b\u8bd5\u7ed3\u679c\uff0c\u6211\u4eec\u53ef\u4ee5\u8fd9\u4e48\u8ba4\u4e3a\u2014\u2014\u53ea\u8981\u8fd4\u56de\u503c\u4e0d\u662fnull<\/code>\uff0c\u5219\"required\"<\/code>.<\/p>\n
\"MooTools\u4e0b\u6d4b\u8bd5\u6570\u636e\u4e0d\u652f\u6301\u5747\u4e3anull<\/p>\n
\u4e8e\u662f\uff1a<\/p>\n
\n
Element.implement({\n    isRequired: function() {\n        return this.getProperty(\"required\") !== null? \"required\": null;\n    }\n});<\/pre>\n<\/div>\n
\u4e5f\u53ef\u4ee5\u8f7b\u8f7b\u5730\u70b9\u51fb\u8fd9\u91cc\u67e5\u770b\uff1amt-isRequired.js<\/a><\/p>\n
\u4e8e\u662f\uff08\u8fd4\u56de\u503c\u7c7b\u578b\u4e0eMooTools getProperty()<\/code>\u65b9\u6cd5\u9760\u9f50\uff09\uff1a<\/p>\n
\n
console.log($(\"input\").isRequired());    \/\/ required\u6216null<\/span><\/pre>\n<\/div>\n
\u539f\u751fJS\u4e0b\u7684\u5904\u7406<\/strong>
\n\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n
\n
var $isRequired = function(ele) {\n    if (!ele || ele.nodeType !== 1) return;\n    var isRequired = null;\n    if (typeof window.screenX === \"number\") {\n        if (typeof ele.getAttribute(\"required\") === \"string\") {\n            isRequired = 'required';    \n        }\n    } else {\n        \/\/ IE6, IE7, IE8<\/span>\n        var outer = ele.outerHTML, part = outer.slice(0, outer.search(\/\\\/?['\"]?>(?![^<]*<['\"])\/));\n        if (\/\\srequired\\b\/i.test(part)) isRequired = 'required';    \n    }\n    return isRequired;\n};<\/pre>\n<\/div>\n
\u4e5f\u53ef\u4ee5\u8f7b\u8f7b\u5730\u70b9\u51fb\u8fd9\u91cc\u67e5\u770b\uff1ajs-isRequired.js<\/a><\/p>\n
\u4e8e\u662f\uff08\u8fd4\u56de\u503c\u7c7b\u578b\u4e0eMooTools getProperty()<\/code>\u65b9\u6cd5\u9760\u9f50\uff09\uff1a<\/p>\n
\n
console.log($isRequired(document.getElementById(\"input\")));    \/\/ required\u6216null<\/span><\/pre>\n<\/div>\n
\u4ee5\u4e0a\u65b9\u6cd5\uff0c\u6211\u5747\u653e\u5728\u4e86\u4e00\u4e2a\u9875\u9762\u4e2d\uff0c\u65b9\u4fbf\u6d4b\u8bd5\uff0c\u5bf9\u6bd4\u67e5\u770b\u3002\u60a8\u53ef\u4ee5\u72e0\u72e0\u5730\u70b9\u51fb\u8fd9\u91cc\uff1a\u517c\u5bb9\u5904\u7406required\u83b7\u53d6\u65b9\u6cd5\u540edemo<\/a><\/p>\n
\"\u517c\u5bb9\u5904\u7406\u6d4b\u8bd5\u9875\u9762\u7f29\u7565\u56fe<\/p>\n
\u6d4b\u8bd5\u6570\u636e\u53c2\u89c1\u4e0b\u8868\uff1a<\/p>\n
\n
<input required \/>\u4ee5\u53ca<input data-type=required \/>\u6d4b\u8bd5<\/strong><\/p>\n\n\n\n\n\n\n\n\n\n
required\/\u975erequired<\/em> - demo<\/a><\/th>\njQuery 1.4.4 isRequired()<\/th>\njQuery 1.6.3 isRequired()<\/th>\nMooTools 1.4 isRequired()<\/th>\nJS $isRequired()<\/th>\n<\/tr>\n
IE6<\/th>\nrequired\/undefined<\/td>\nrequired\/undefined<\/td>\nrequired\/null<\/td>\nrequired\/null<\/td>\n<\/tr>\n
IE10\u2198IE7| \u540c\u73af\u5883\u4e0b\u641c\u72d7\u517c\u5bb9<\/th>\nrequired\/undefined<\/td>\nrequired\/undefined<\/td>\nrequired\/null<\/td>\nrequired\/null<\/td>\n<\/tr>\n
IE9\u2198IE7|IE8\u2198IE7 |ieTester IE7<\/th>\nrequired\/undefined<\/td>\nrequired\/undefined<\/td>\nrequired\/null<\/td>\nrequired\/null<\/td>\n<\/tr>\n
IE10\u2198IE8<\/th>\nrequired\/undefined<\/td>\nrequired\/undefined<\/td>\nrequired\/null<\/td>\nrequired\/null<\/td>\n<\/tr>\n
IE8|IE9\u2198IE8 |ieTester IE8<\/th>\nrequired\/undefined<\/td>\nrequired\/undefined<\/td>\nrequired\/null<\/td>\nrequired\/null<\/td>\n<\/tr>\n
IE9 All<\/th>\nrequired\/undefined<\/td>\nrequired\/undefined<\/td>\nrequired\/null<\/td>\nrequired\/null<\/td>\n<\/tr>\n
IE10|FireFox17| Chrome21|Opera12<\/th>\nrequired\/undefined<\/td>\nrequired\/undefined<\/td>\nrequired\/null<\/td>\nrequired\/null<\/td>\n<\/tr>\n<\/table>\n<\/div>\n
\u54e6\u54c8\u54c8\uff0c\u7ec8\u4e8e\u5e72\u51c0\u4e86\u4e00\u628a\uff01<\/p>\n
\u56db\u3001\u5c0f\u5c0f\u6269\u5c55\uff0c\u4e00\u52b3\u6c38\u9038<\/h3>\n
\u4ee5\u4e0a\u7684\u53ea\u662f\u9488\u5bf9required<\/code>\u5224\u65ad\u7684\u65b9\u6cd5\uff0c\u5176\u5b9e\uff0c\u540c\u6837\u7684\u539f\u7406\uff0c\u6211\u4eec\u53ef\u4ee5\u5c0f\u5c0f\u6269\u5c55\uff0c\u4ee5\u540e\u7c7b\u4f3cautofocus<\/code>, novalidate<\/code>\u8fd9\u4e9bBoolean\u578b\u5c5e\u6027\uff0c\u90fd\u53ef\u4ee5\u7528\u6765\u9a8c\u8bc1\u5566\uff01
\n\/\/zxx: checked<\/code>, disabled<\/code>\u867d\u7136\u4e5f\u662fBoolean\u578b\uff0c\u4f46\u662f\uff0c\u4f4e\u7248\u672cIE\u652f\u6301\u4e4b\uff0c\u56e0\u6b64\uff0c\u4f7f\u7528\u81ea\u5e26\u65b9\u6cd5\u5982prop()<\/code>\u5373\u53ef\u3002<\/span><\/p>\n
\u4ee5jQuery\u73af\u5883\u4e3e\u4f8b\uff0c\u6211\u4eec\u6269\u5c55\u4e2ahasProp()<\/code>\u65b9\u6cd5\uff1a<\/p>\n
\n
(function($, undefined) {\n    $.fn.hasProp = function(prop) {\n        if (typeof prop !== \"string\") return undefined; \n        var hasProp = false;\n        if (document.querySelector) {\n            var attrProp = $(this).attr(prop);\n            if (attrProp !== undefined && attrProp !== false) {\n                hasProp = true;\n            }\n        } else {\n            \/\/ IE6, IE7\n            var outer = $(this).get(0).outerHTML, part = outer.slice(0, outer.search(\/\\\/?['\"]?>(?![^<]*<['\"])\/));\n            hasProp = new RegExp(\"\\\\s\" + prop + \"\\\\b\", \"i\").test(part);\n        }\n        return hasProp;\n    };    \n})(jQuery);<\/pre>\n<\/div>\n
\u4e8e\u662f\uff0c\u5c31\u53ef\u4ee5\u6d4b\u8bd5\u4e86\uff0c\u60a8\u53ef\u4ee5\u72e0\u72e0\u5730\u70b9\u51fb\u8fd9\u91cc\uff1ahasProp()\u6269\u5c55\u65b9\u6cd5\u6d4b\u8bd5demo<\/a><\/p>\n
\u7ed3\u679c\uff1a
\n\"hasProp\u6269\u5c55\u65b9\u6cd5\u6d4b\u8bd5\u6548\u679c\u622a\u56fe<\/p>\n
JS\u6587\u4ef6\u53ef\u4ee5\u8f7b\u8f7b\u5730\u70b9\u51fb\u8fd9\u91cc\u67e5\u770b\uff1ajquery-hasProp.js<\/a><\/p>\n
\u4e94\u3001\u9a71\u8f66\u8d76\u8def\uff0c\u6167\u7136\u79bb\u53bb<\/h3>\n
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