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    zero-to-one-view

    1.0.0 • Public • Published

    egg-view

    NPM version build status Test coverage David deps Known Vulnerabilities npm download

    Base view plugin for egg

    it's a plugin that has been built-in for egg.

    Install

    $ npm i egg-view --save

    Usage

    // {app_root}/config/plugin.js
    exports.view = {
      enable: true,
      package: 'egg-view',
    };

    Use a template engine

    egg-view don't have build-in view engine, So you should choose a template engine like ejs, and install egg-view-ejs plugin.

    You can choose a template engine first, link ejs, so we use egg-view-ejs plugin.

    egg-view is in eggjs, so you just need configure egg-view-ejs.

    // config/plugin.js
    exports.ejs = {
      enable: true,
      package: 'egg-view-ejs',
    };

    Configure the mapping, the file with .ejs extension will be rendered by ejs.

    // config/config.default.js
    exports.view = {
      mapping: {
        '.ejs': 'ejs',
      },
    };

    In controller, you can call ctx.render.

    module.exports = app => {
      return class UserController extends app.Controller {
        * list() {
          const { ctx } = this;
          yield ctx.render('user.ejs');
        }
      };
    };

    If you call ctx.renderString, you should specify viewEngine in viewOptions.

    module.exports = app => {
      return class UserController extends app.Controller {
        * list() {
          const { ctx } = this;
          ctx.body = yield ctx.renderString('<%= user %>', { user: 'popomore' }, {
            viewEngine: 'ejs',
          });
        }
      };
    };

    Use multiple view engine

    egg-view support multiple view engine, so you can use more than one template engine in one application.

    If you want add another template engine like nunjucks, then you can add egg-view-nunjucks plugin.

    Configure the plugin and mapping

    // config/config.default.js
    exports.view = {
      mapping: {
        '.ejs': 'ejs',
        '.nj': 'nunjucks',
      },
    };

    You can simply render the file with .nj extension.

    yield ctx.render('user.nj');

    How to write a view plugin

    You can use egg-view' API to register a plugin.

    View engine

    Create a view engine class first, and implement render and renderString, if the template engine don't support, just throw an error. The view engine is context level, so it receive ctx in constructor.

    // lib/view.js
    module.exports = class MyView {
      constructor(ctx) {
        // do some initialize
        // get the plugin config from `ctx.app.config`
      }
    
      * render(fullpath, locals) {
        return myengine.render(fullpath, locals);
      }
    
      * renderString() { throw new Error('not implement'); }
    };

    render and renderString support generator function, async function, or normal function return a promise.

    If the template engine only support callback, you can wrap it by Promise.

    class MyView {
      render(fullpath, locals) {
        return new Promise((resolve, reject) => {
          myengine.render(fullpath, locals, (err, result) => {
            if (err) {
              reject(err);
            } else {
              resolve(result);
            }
          });
        });
      }
    };

    These methods receive three arguments, renderString will pass tpl as the first argument instead of name in render.

    render(name, locals, viewOptions)

    • name: the file path that can resolve from root (app/view by default)
    • locals: data used by template
    • viewOptions: the view options for each render, it can override the view default config in config/config.default.js. Plugin should implement it if it has config. When you implement view engine, you will receive this options from render, the options contain:
      • root: egg-view will resolve the name to full path, but seperating root and name in viewOptions.
      • name: the original name when call render

    renderString(tpl, locals, viewOptions)

    • tpl: the template string instead of the file, using in renderString
    • locals: same as render
    • viewOptions: same as render

    Register

    After define a view engine, you can register it.

    // app.js
    module.exports = app => {
      app.view.use('myName', require('./lib/view'));
    };

    You can define a view engine name, normally it's a template name.

    Configure

    Define plugin name and depend on egg-view

    {
      "eggPlugin": {
        "name": "myName",
        "dependencies": [ "view" ]
      }
    }

    Set default config in config/config.default.js, the name is equals to plugin name.

    exports.myName = {},

    See some examples

    Configuration

    Root

    Root is ${baseDir}/app/view by default, but you can define multiple directory, seperated by ,. egg-view will find a file from all root directories.

    module.exports = appInfo => {
      const baseDir = appInfo.baseDir;
      return {
        view: {
          root: `${baseDir}/app/view,${baseDir}/app/view2`
        }
      }
    }

    defaultExtension

    When render a file, you should specify a extension that let egg-view know whitch engine you want to use. However you can define defaultExtension without write the extension.

    // config/config.default.js
    exports.view = {
      defaultExtension: '.html',
    };
    
    // controller
    module.exports = app => {
      return class UserController extends app.Controller {
        * list() {
          const { ctx } = this;
          // render user.html
          yield ctx.render('user');
        }
      };
    };

    viewEngine and defaultViewEngine

    If you are using renderString, you should specify viewEngine in view config, see example above.

    However, you can define defaultViewEngine without set each time.

    // config/config.default.js
    exports.view = {
      defaultViewEngine: 'ejs',
    };

    see config/config.default.js for more detail.

    Questions & Suggestions

    Please open an issue here.

    License

    MIT

    Keywords

    none

    Install

    npm i zero-to-one-view

    DownloadsWeekly Downloads

    3

    Version

    1.0.0

    License

    ISC

    Last publish

    Collaborators

    • lovelife10000