/* MIT License http://www.opensource.org/licenses/mit-license.php Author Tobias Koppers @sokra Modified by Evan You @yyx990803 */ import listToStyles from './listToStyles' var hasDocument = typeof document !== 'undefined' if (typeof DEBUG !== 'undefined' && DEBUG) { if (!hasDocument) { throw new Error( 'vue-style-loader cannot be used in a non-browser environment. ' + "Use { target: 'node' } in your Webpack config to indicate a server-rendering environment." ) } } /* type StyleObject = { id: number; parts: Array<StyleObjectPart> } type StyleObjectPart = { css: string; media: string; sourceMap: ?string } */ var stylesInDom = {/* [id: number]: { id: number, refs: number, parts: Array<(obj?: StyleObjectPart) => void> } */} var head = hasDocument && (document.head || document.getElementsByTagName('head')[0]) var singletonElement = null var singletonCounter = 0 var isProduction = false var noop = function () {} var options = null var ssrIdKey = 'data-vue-ssr-id' // Force single-tag solution on IE6-9, which has a hard limit on the # of <style> // tags it will allow on a page var isOldIE = typeof navigator !== 'undefined' && /msie [6-9]\b/.test(navigator.userAgent.toLowerCase()) export default function addStylesClient (parentId, list, _isProduction, _options) { isProduction = _isProduction options = _options || {} var styles = listToStyles(parentId, list) addStylesToDom(styles) return function update (newList) { var mayRemove = [] for (var i = 0; i < styles.length; i++) { var item = styles[i] var domStyle = stylesInDom[item.id] domStyle.refs-- mayRemove.push(domStyle) } if (newList) { styles = listToStyles(parentId, newList) addStylesToDom(styles) } else { styles = [] } for (var i = 0; i < mayRemove.length; i++) { var domStyle = mayRemove[i] if (domStyle.refs === 0) { for (var j = 0; j < domStyle.parts.length; j++) { domStyle.parts[j]() } delete stylesInDom[domStyle.id] } } } } function addStylesToDom (styles /* Array<StyleObject> */) { for (var i = 0; i < styles.length; i++) { var item = styles[i] var domStyle = stylesInDom[item.id] if (domStyle) { domStyle.refs++ for (var j = 0; j < domStyle.parts.length; j++) { domStyle.parts[j](item.parts[j]) } for (; j < item.parts.length; j++) { domStyle.parts.push(addStyle(item.parts[j])) } if (domStyle.parts.length > item.parts.length) { domStyle.parts.length = item.parts.length } } else { var parts = [] for (var j = 0; j < item.parts.length; j++) { parts.push(addStyle(item.parts[j])) } stylesInDom[item.id] = { id: item.id, refs: 1, parts: parts } } } } function createStyleElement () { var styleElement = document.createElement('style') styleElement.type = 'text/css' head.appendChild(styleElement) return styleElement } function addStyle (obj /* StyleObjectPart */) { var update, remove var styleElement = document.querySelector('style[' + ssrIdKey + '~="' + obj.id + '"]') if (styleElement) { if (isProduction) { // has SSR styles and in production mode. // simply do nothing. return noop } else { // has SSR styles but in dev mode. // for some reason Chrome can't handle source map in server-rendered // style tags - source maps in <style> only works if the style tag is // created and inserted dynamically. So we remove the server rendered // styles and inject new ones. styleElement.parentNode.removeChild(styleElement) } } if (isOldIE) { // use singleton mode for IE9. var styleIndex = singletonCounter++ styleElement = singletonElement || (singletonElement = createStyleElement()) update = applyToSingletonTag.bind(null, styleElement, styleIndex, false) remove = applyToSingletonTag.bind(null, styleElement, styleIndex, true) } else { // use multi-style-tag mode in all other cases styleElement = createStyleElement() update = applyToTag.bind(null, styleElement) remove = function () { styleElement.parentNode.removeChild(styleElement) } } update(obj) return function updateStyle (newObj /* StyleObjectPart */) { if (newObj) { if (newObj.css === obj.css && newObj.media === obj.media && newObj.sourceMap === obj.sourceMap) { return } update(obj = newObj) } else { remove() } } } var replaceText = (function () { var textStore = [] return function (index, replacement) { textStore[index] = replacement return textStore.filter(Boolean).join('\n') } })() function applyToSingletonTag (styleElement, index, remove, obj) { var css = remove ? '' : obj.css if (styleElement.styleSheet) { styleElement.styleSheet.cssText = replaceText(index, css) } else { var cssNode = document.createTextNode(css) var childNodes = styleElement.childNodes if (childNodes[index]) styleElement.removeChild(childNodes[index]) if (childNodes.length) { styleElement.insertBefore(cssNode, childNodes[index]) } else { styleElement.appendChild(cssNode) } } } function applyToTag (styleElement, obj) { var css = obj.css var media = obj.media var sourceMap = obj.sourceMap if (media) { styleElement.setAttribute('media', media) } if (options.ssrId) { styleElement.setAttribute(ssrIdKey, obj.id) } if (sourceMap) { // https://developer.chrome.com/devtools/docs/javascript-debugging // this makes source maps inside style tags work properly in Chrome css += '\n/*# sourceURL=' + sourceMap.sources[0] + ' */' // http://stackoverflow.com/a/26603875 css += '\n/*# sourceMappingURL=data:application/json;base64,' + btoa(unescape(encodeURIComponent(JSON.stringify(sourceMap)))) + ' */' } if (styleElement.styleSheet) { styleElement.styleSheet.cssText = css } else { while (styleElement.firstChild) { styleElement.removeChild(styleElement.firstChild) } styleElement.appendChild(document.createTextNode(css)) } }