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如何将注册助手用于node.js和表达把手

[英]How to use register helpers for node.js and express handlebars

我的表单上有一个选择选项,在加载记录后,我想选择保存的选项。 这是代码:

我正在显示表单的Student.hbs文件,行为obj来自student.js路由

student.hbs

<form>
    <div class="form-group">
        <label for="day">Day</label>
        <select name="day" id="day" class="form-control">
            <option value="monday" {{{select act.day 'monday'}}}>Monday</option>
            <option value="tuesday" {{{select act.day 'tuesday'}}}>Tuesday</option>
            <option value="wednesday" {{{select act.day 'wednesday'}}}>Wednesday</option>
            <option value="thursday" {{{select act.day 'thursday'}}}>Thursday</option>
            <option value="friday" {{{select act.day 'friday'}}}>Friday</option>
            <option value="saturday" {{{select act.day 'saturday'}}}>Saturday</option>
            <option value="sunday" {{{select act.day 'sunday'}}}>Sunday</option>
        </select>
    </div>
</form>

student.js

router.get('/view/:actUUID', (req, res) => {
    var uuid = req.params.actUUID;
    Student.findByPk(uuid).then(act => {
        res.render('student', {
            act: act 
        });
    });
});

我已经在/handlers/handlebars.js中创建了车把帮助器,并在其中编写了所有帮助器函数。

app.js

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

app.engine('.hbs', hbsHelpers.engine);
app.set('views', path.join(__dirname, 'views'));                 
app.set('view engine', 'hbs');

/handlers/handlebars.js

function hbsHelpers(hbs) {
    return hbs.create({
        helpers: {
            select: function (selected, option) {
                return (selected == option) ? 'selected="selected"' : '';
            }
        }
    });
}
module.exports = hbsHelpers;

但是当我转到学生页面时,出现以下错误

错误:缺少帮助程序:在对象处“选择”。 (/ Volumes / Macintosh HD 2 / GitHub已克隆Repos / action-tours / node_modules / handlebars / dist / cjs / handlebars / helpers / helper-missing.js:19:13),位于Object.eval [作为主要对象](在createFunctionContext中为eval) (/ Volumes / Macintosh HD 2 / GitHub Cloned Repos / action-tours / node_modules / handlebars / dist / cjs / handlebars / compiler / javascript-compiler.js:254:23),: 15:74)位于主目录(/ Volumes / Macintosh HD 2 / GitHub已克隆Repos / action-tours / node_modules / handlebars / dist / cjs / handlebars / runtime.js:175:32)在ret(/ Volumes / Macintosh HD 2 / GitHub Cloned Repos / action-tours / node_modules / ret(/ Volumes / Macintosh HD 2 / GitHub Cloned Repos / action-tours / node_modules / handlebars / dist / cjs / handlebars / compiler / compiler.js上的handlebars / dist / cjs / handlebars / runtime.js:178:12): 526:21)在ExpressHandlebars._renderTemplate(/ Volumes / Macintosh HD 2 / GitHub Cloned Repos / action-tours / node_modules / express-handlebars / lib / express-handlebars.js:247:12)中。 (/卷/ Macintosh HD 2 / GitHub克隆的Repos / action-tours / node_modules / express-handlebars / lib / express-handlebars.js:173:21)

因此,似乎没有必要在handlebars.js文件中返回hbs.create。

正确的方法是:

app.js

var exphbs = require('express-handlebars’);
.
.
.

var hbs = exphbs.create({
    helpers: require('./handlers/handlebars'),
    defaultLayout: 'main',
    extname:'.hbs'
});

.
.
app.engine('.hbs', hbs.engine);

在/handlers/handlebars.js中

module.exports = {
    select: function (selected, option) {
        return (selected == option) ? 'selected="selected"' : '';
    }
};

在/handlers/handlebars.js中

你做这样的事情

module.exports = {
      select: function(selected, options){
            return options.fn(this).replace( new RegExp(' value=\"' + selected + '\"'), '$& selected="selected"').replace( new RegExp('>' + selected + '</option>'), ' selected="selected"$&');
        },
};

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