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jsdom Element.dataset partial polyfill
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| { | |
| "name": "jsdomdataset", | |
| "version": "1.0.0", | |
| "description": "", | |
| "main": "polyfill-jsdom.js", | |
| "scripts": { | |
| "test": "echo \"Error: no test specified\" && exit 1" | |
| }, | |
| "author": "", | |
| "license": "GPL-3.0", | |
| "dependencies": { | |
| "jsdom": "^7.0.2" | |
| } | |
| } |
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| /** | |
| * Convert data-attr into key | |
| * data-foo-bar -> fooBar | |
| * @param {String} val | |
| * @returns {String} | |
| */ | |
| var _attrToDataKey = function( val ){ | |
| var out = val.substr( 5 ); | |
| return out.split( "-" ).map(function( part, inx ){ | |
| if ( !inx ) { | |
| return part; | |
| } | |
| return part.charAt( 0 ).toUpperCase() + part.substr( 1 ); | |
| }).join( "" ); | |
| }, | |
| /** | |
| * Produce dataset object emulating behavior of el.dataset | |
| * @param {Element} el | |
| * @returns {Object} | |
| */ | |
| _getNodeDataAttrs = function( el ){ | |
| var i = 0, | |
| atts = el.attributes, | |
| len = atts.length, | |
| attr, | |
| _datasetMap = [], | |
| // represents el.dataset | |
| proxy = {}, | |
| datakey; | |
| for ( ; i < len; i++ ){ | |
| attr = atts[ i ].nodeName; | |
| if ( attr.indexOf( "data-" ) === 0 ) { | |
| datakey = _attrToDataKey( attr ); | |
| if ( typeof _datasetMap[ datakey ] !== "undefined" ) { | |
| break; | |
| } | |
| _datasetMap[ datakey ] = atts[ i ].nodeValue; | |
| (function( datakey ){ | |
| // every data-attr found on the element makes a getter and setter | |
| Object.defineProperty( proxy, datakey, { | |
| enumerable: true, | |
| configurable: true, | |
| get: function() { | |
| return _datasetMap[ datakey ]; | |
| }, | |
| set: function ( val ) { | |
| _datasetMap[ datakey ] = val; | |
| el.setAttribute( attr, val ); | |
| } | |
| }); | |
| }( datakey )); | |
| } | |
| } | |
| return proxy; | |
| }; | |
| Object.defineProperty( global.window.Element.prototype, "dataset", { | |
| get: function() { | |
| return _getNodeDataAttrs( this ); | |
| } | |
| }); |
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| require( "jsdom" ).env({ | |
| html: "<html><body data-bind=\"foo\" data-foo-bar=\"baz\"></body></html>", | |
| done: function ( err, window ) { | |
| var el = window.document.body; | |
| global.window = window; | |
| require( "./polyfill-jsdom" ); | |
| console.log( "Access: ", el.dataset.bind === "foo" ? "OK" : "FAIL" ); | |
| el.dataset.bind = "bar"; | |
| console.log( "Mutation: ", el.dataset.bind === "bar" ? "OK" : "FAIL" ); | |
| } | |
| }); |
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