如何使把手帮助全局(在expressjs)

Question

我有一个非常简单的把手助手文件helpers/handlebars.js:

var hbs = require('express-handlebars');

hbs.registerHelper("inc", function(value, options) {
    return parseInt(value) + 1;
});

但是,正如预期的那样,我不能引用{{#inc}}帮助器,因为我没有将它传递给res.render()函数.有没有办法让我的文件中的所有助手全局并"自动包含"？

编辑:

在尝试了@ 1cgonza的精彩答案后,我得到:

hbs.registerHelper("inc", function(value, options) {
      ^
TypeError: undefined is not a function

运行应用程序时.这是app.js:

var engine      = require('express-handlebars');
                  require('./helpers/handlebars.js')(engine);

app.engine('hbs',           engine({defaultLayout: 'layout', extname: 'hbs'}));
app.set('view engine',      'hbs');

有任何想法吗？

Answer 1

您可以尝试将助手导出为模块,然后将其包含在主app.js中

像这样的东西:

在你的 helpers/handlebars.js

function hbsHelpers(hbs) {
  hbs.registerHelper("inc", function(value, options) {
    return parseInt(value) + 1;
  });

  // More helpers...
}

module.exports = hbsHelpers;

然后在你的app.js(或你用作索引的文件)中.

var hbs = require('express-handlebars');
require('./helpers/handlebars')(hbs);

那对你有用吗？

编辑

基于express-handlebars 文档,我会将您的功能更改为helpers/handlebars.js以下内容:

function hbsHelpers(hbs) {
  return hbs.create({
    helpers: { // This was missing
      inc: function(value, options) {
        console.log('reading it');
        return parseInt(value) + 1;
      }

      // More helpers...
    }

  });
}

module.exports = hbsHelpers;

如果有效,请告诉我们.

编辑2:

我的错误,将帮助器包装在文件中helpers:{}的create()函数中handelbars.js.我已经编辑了我以前的答案,看看我在哪里发表评论,知道我在说什么.

至于app.js我认为它有点混乱,所以让我重命名一些事情来说清楚:

// I've changed this from engine to exphbs,
// so there is no confusion with the express engine object that we use later.
var exphbs = require('express-handlebars');

// Create an instance of the express-handlebars
// If you want to pass any option offered by express-handlebar module
// do it inside the create() in the handlebars.js file
var handlebars  = require('./helpers/handlebars.js')(exphbs);

// The handlebars variable now has an object called engine.
// Use that to define your app.engine
// As said before, you don't need to define any options here.
// Everything is defined in the create() in handlebars.js
app.engine('hbs', handlebars.engine);

// If you are using a different extension, you can change hbs to whatever you are using. 
app.set('view engine', 'hbs');

Answer 2

你可以试试:

在helpers/handlebars.js中:

var register = function(Handlebars) {
    var helpers = {
    inc: function(value, options) {
        return parseInt(value) + 1;
    },
    foo: function(var1, var2) {
        return ....
    }
};

if (Handlebars && typeof Handlebars.registerHelper === "function") {
    for (var prop in helpers) {
        Handlebars.registerHelper(prop, helpers[prop]);
    }
} else {
    return helpers;
}

};

module.exports.register = register;
module.exports.helpers = register(null); 

在app.js中:

var exphbs = require('express-handlebars');
var hbsHelpers = exphbs.create({
    helpers: require("./helpers/handlebars.js").helpers,
    defaultLayout: 'layout',
    extname: '.hbs'
});

app.engine('.hbs', hbsHelpers.engine);
app.set('view engine', '.hbs');