使用Javascript确定JSF库资源

我是Primefaces Extensions项目的开发人员，我使用Primefaces JS核心函数获取DocumentViewer和CKEditor组件的Javascript资源位置。该函数位于PrimeFaces core.js中，如下所示

   /**
     * Builds a resource URL for given parameters.
     *
     * @param {string} name The name of the resource. For example: primefaces.js
     * @param {string} library The library of the resource. For example: primefaces
     * @param {string} version The version of the library. For example: 5.1
     * @returns {string} The resource URL.
     */
getFacesResource : function(name, library, version) {
    // just get sure - name shoudln't start with a slash
    if (name.indexOf('/') === 0)
    {
        name = name.substring(1, name.length);
    }

    var scriptURI = $('script[src*="/' + PrimeFaces.RESOURCE_IDENTIFIER + '/core.js"]').attr('src');
    // portlet
    if (!scriptURI) {
        scriptURI = $('script[src*="' + PrimeFaces.RESOURCE_IDENTIFIER + '=core.js"]').attr('src');
    }

    scriptURI = scriptURI.replace('core.js', name);

它所做的是在DOM中找到“core.js”脚本，然后删除core.js，这样它就有了一个合适的位置来放置您为查找资源而构建的新URL

我们为什么需要这样做？

CKEDitor和DocumentViewer组件是复杂的组件，可以加载大量插件、语言文件等。我们不能修改这些插件每次升级时使用的核心JS文件，我们必须编辑它们的核心源代码。因此，对于要加载语言包的DocumentViewer，库值具有“DocumentViewer/locale/en GB.locale.txt”以加载DocumentViewer使用的PDF.js的英语语言包。然而，这需要成为真正的资源，所以

PrimeFaces.getFacesResource（'documentviewer/locale/en GB.locale.txt'）

将URL转换为PDF.JS代码可以找到的适当资源，例如：

https://www.primefaces.org/showcase-ext/javax.faces.resource/documentviewer/locale/en-GB.locale.txt.jsf?ln=primefaces-extensions&v=6.2.5

它处理知道完整URL、附加库版本以及知道当前服务器是否提供.jsf或.xhtml扩展名等

问题：

/**
    * Builds a resource URL for given parameters.
    * 
    * @param {string}
    *        name The name of the resource. For example: primefaces.js
    * @param {string}
    *        library The library of the resource. For example: primefaces
    * @param {string}
    *        version The version of the library. For example: 5.1
    * @returns {string} The resource URL.
    */
   getFacesResource : function(name, library, version) {
      // just get sure - name shoudln't start with a slash
      if (name.indexOf('/') === 0) {
         name = name.substring(1, name.length);
      }

      // find any JS served JSF resource
      var scriptURI = $('script[src*="/' + PrimeFaces.RESOURCE_IDENTIFIER + '/"]').first().attr('src');
      // portlet
      if (!scriptURI) {
        scriptURI = $('script[src*="' + PrimeFaces.RESOURCE_IDENTIFIER + '="]').first().attr('src');
      }

      // find script...normal is '/core.js' and portlets are '=core.js'
      var scriptRegex = new RegExp('\\/' + PrimeFaces.RESOURCE_IDENTIFIER + '(\\/|=)(.*?)\\.js');

      // find script to replace e.g. 'core.js'
      var currentScriptName = scriptRegex.exec(scriptURI)[2] + '.js';

      // replace core.js with our custom name
      scriptURI = scriptURI.replace(currentScriptName, name);

      // find the library like ln=primefaces
      var libraryRegex = new RegExp('[?&]([^&=]*)ln=(.*?)(&|$)');

      // find library to replace e.g. 'ln=primefaces'
      var currentLibraryName = 'ln=' + libraryRegex.exec(scriptURI)[2];

      // In a portlet environment, url parameters may be namespaced.
      var namespace = '';
      var urlParametersAreNamespaced = !(scriptURI.indexOf('?' + currentLibraryName) > -1 || scriptURI.indexOf('&'
            + currentLibraryName) > -1);

      if (urlParametersAreNamespaced) {
         namespace = new RegExp('[?&]([^&=]+)' + currentLibraryName + '($|&)').exec(scriptURI)[1];
      }

      // If the parameters are namespaced, the namespace must be included
      // when replacing parameters.
      scriptURI = scriptURI.replace(namespace + currentLibraryName, namespace + 'ln=' + library);

      if (version) {
         var extractedVersion = new RegExp('[?&]' + namespace + 'v=([^&]*)').exec(scriptURI)[1];
         scriptURI = scriptURI.replace(namespace + 'v=' + extractedVersion, namespace + 'v=' + version);
      }

      var prefix = window.location.protocol + '//' + window.location.host;
      return scriptURI.indexOf(prefix) >= 0 ? scriptURI : prefix + scriptURI;
   },

我正在使用它获取所有JS文件，并从找到的所有JS文件中创建一个脚本。所以10个不同的JS文件现在就成了这样性能的一个资源

/javax.faces.resource/XXX.js.xhtml?ln=omnifaces.combined&v=1532916484000

现在这破坏了core PrimeFaces代码，因为它无法查找core.js，因为页面上不再存在core.js

我尝试使用此开关将core.js排除在组合之外

<context-param>
    <param-name>org.omnifaces.COMBINED_RESOURCE_HANDLER_EXCLUDED_RESOURCES</param-name>
    <param-value>primefaces:core.js</param-value>
</context-param>

org.omnifaces.composed\u RESOURCE\u HANDLER\u EXCLUDED\u RESOURCES
primefaces:core.js

在omnifaces.combined.js之后加载PrimeFaces core.js，这会破坏整个页面。要确认输出是否正确，请执行以下操作

<script src="/primeext-showcase/javax.faces.resource/XXX.js.jsf?ln=omnifaces.combined&amp;v=1533319992000"></script>
<script src="/primeext-showcase/javax.faces.resource/core.js.jsf?ln=primefaces&amp;v=6.2">

---

因此，我的问题是如何使用纯JavaScript替换/修复PrimeFaces.getFacesResource（）JS函数，以确定OmniFaces是否合并了脚本？

我能够重写该方法，以避免使用正则表达式在页面上找到core.JS。它现在在PrimeFaces处于正常模式时工作，如果使用OmniFaces CombinedResourceHandler，它将工作。我将把它作为补丁提交给PrimeFaces

这里是最后的工作方法：

/**
    * Builds a resource URL for given parameters.
    * 
    * @param {string}
    *        name The name of the resource. For example: primefaces.js
    * @param {string}
    *        library The library of the resource. For example: primefaces
    * @param {string}
    *        version The version of the library. For example: 5.1
    * @returns {string} The resource URL.
    */
   getFacesResource : function(name, library, version) {
      // just get sure - name shoudln't start with a slash
      if (name.indexOf('/') === 0) {
         name = name.substring(1, name.length);
      }

      // find any JS served JSF resource
      var scriptURI = $('script[src*="/' + PrimeFaces.RESOURCE_IDENTIFIER + '/"]').first().attr('src');
      // portlet
      if (!scriptURI) {
        scriptURI = $('script[src*="' + PrimeFaces.RESOURCE_IDENTIFIER + '="]').first().attr('src');
      }

      // find script...normal is '/core.js' and portlets are '=core.js'
      var scriptRegex = new RegExp('\\/' + PrimeFaces.RESOURCE_IDENTIFIER + '(\\/|=)(.*?)\\.js');

      // find script to replace e.g. 'core.js'
      var currentScriptName = scriptRegex.exec(scriptURI)[2] + '.js';

      // replace core.js with our custom name
      scriptURI = scriptURI.replace(currentScriptName, name);

      // find the library like ln=primefaces
      var libraryRegex = new RegExp('[?&]([^&=]*)ln=(.*?)(&|$)');

      // find library to replace e.g. 'ln=primefaces'
      var currentLibraryName = 'ln=' + libraryRegex.exec(scriptURI)[2];

      // In a portlet environment, url parameters may be namespaced.
      var namespace = '';
      var urlParametersAreNamespaced = !(scriptURI.indexOf('?' + currentLibraryName) > -1 || scriptURI.indexOf('&'
            + currentLibraryName) > -1);

      if (urlParametersAreNamespaced) {
         namespace = new RegExp('[?&]([^&=]+)' + currentLibraryName + '($|&)').exec(scriptURI)[1];
      }

      // If the parameters are namespaced, the namespace must be included
      // when replacing parameters.
      scriptURI = scriptURI.replace(namespace + currentLibraryName, namespace + 'ln=' + library);

      if (version) {
         var extractedVersion = new RegExp('[?&]' + namespace + 'v=([^&]*)').exec(scriptURI)[1];
         scriptURI = scriptURI.replace(namespace + 'v=' + extractedVersion, namespace + 'v=' + version);
      }

      var prefix = window.location.protocol + '//' + window.location.host;
      return scriptURI.indexOf(prefix) >= 0 ? scriptURI : prefix + scriptURI;
   },

---

你认为需要“重新定位”core.js的原因是什么？@Kukeltje我在上面添加了“为什么我们需要这个？”一节，以澄清正在做什么以及为什么我们需要它。我仍然不明白为什么需要将core.js分离以加载语言文件。如果将一个参数传递给函数，则其他参数显式为空。也许只是通过一个额外的/显式的库？谢谢伙计们，我能够通过使用更好的正则表达式重写方法来解决这个问题，并在两种情况下对它进行了测试，现在一切都很好。