11

我有这样的骨干模型

var PeopleModel = Backbone.Model.extend({
defaults: {              
    "people": [
          { "username": "alan", "firstName": "Alan", "lastName": "Johnson", "phone": "1111", "email": "alan@test.com" },
          { "username": "allison", firstName: "Allison", "lastName": "House", "phone": "2222", "email": "allison@test.com" },
          { "username": "ryan", "firstName": "Ryan", "lastName": "Carson", "phone": "3333", "email": "ryan@test.com" },
          { "username": "ed", "firstName": "Edward", "lastName": "Feild", "phone": "4444", "email": "ed@test.com" },
          { "username": "phil", "firstName": "Philip", "lastName": "Doom", "phone": "5555", "email": "phil@test.com" },
          { "username": "gerald", "firstName": "Gerald", "lastName": "Butler", "phone": "6666", "email": "gerald@test.com" }
    ],
    "company": {"name": "Random Corp."},
    "country": "England"
}

});

下面是我的模板

<script id="people-template" type="text/x-handlebars-template">
{{#each people}}
  {{> person}}
{{/each}}
</script>

<script id="person-partial" type="text/x-handlebars-template">
 <div class="person">
    <h2>{{fullName}} </h2>
    <div class="phone">{{phone}}</div>
   <div class="email"><a href="mailto:{{email}}">{{email}}</a></div>    
 </div>

这就是我使用handlebars.js 实现部分的方式。

我的问题

1.我们有类似的东西,我的意思是underscore.js模板引擎的部分吗?

2.如果是,我们如何在underscore.js模板引擎中实现partial

4

3 回答 3

17

不,Underscore 的模板中没有原生的部分支持。但是,您可以将几乎任何您想要的 JavaScript 放入其中<% ... %>;特别是,您可以调用自己的函数,这样您就可以毫不费力地添加部分内容。你可以有这样的模板:

<script id="people-template" type="text/x-handlebars-template">
    <% _(people).each(function(person) { %>
      <%= partial('person', person) %>
    <% }) %>
</script>

然后添加一个partial函数window

window.partial = function(which, data) {
    var tmpl = $('#' + which + '-partial').html();
    return _.template(tmpl)(data);
};

演示:http: //jsfiddle.net/ambiguous/HDuj5/9/

这不像{{> ... }}在 Handlebars 中那样流畅和漂亮,但 Underscore 的模板是 JavaScript 本身的一个非常薄的包装器,这在一定程度上限制了你。您可以使用命名空间来避免将东西直接放入其中,window或者您可以使用{variable: ...}选项_.template和包装器来设置您的标准助手。

于 2012-07-02T18:01:28.343 回答
13

或者为了避免使用全局范围,您可以像这样混合使用全局模板助手:

(function() {
    var originalUnderscoreTemplateFunction = _.template;
    var templateHelpers = {};

    _.mixin({
        addTemplateHelpers : function( newHelpers ) {
            _.extend( templateHelpers, newHelpers );
        },

        template : function(text, data, settings) {
            // replace the built in _.template function with one that supports the addTemplateHelpers
            // function above. Basically the combo of the addTemplateHelpers function and this new
            // template function allows us to mix in global "helpers" to the data objects passed
            // to all our templates when they render. This replacement template function just wraps
            // the original _.template function, so it sould be pretty break-resistent moving forward.

            if( data )
            {
                // if data is supplied, the original _.template function just returns the raw value of the
                // render function (the final rentered html/text). So in this case we just extend
                // the data param with our templateHelpers and return raw value as well.

                _.defaults( data, templateHelpers ); // extend data with our helper functions
                return originalUnderscoreTemplateFunction.apply( this, arguments ); // pass the buck to the original _.template function
            }

            var template = originalUnderscoreTemplateFunction.apply( this, arguments );

            var wrappedTemplate = function( data ) {
                _.defaults( data, templateHelpers );
                return template.apply( this, arguments );
            };

            return wrappedTemplate;
        }
    }
}

然后打电话

_.addTemplateHelpers( {
    partial : function() {
        return _.template(
            $('#' + which + '-partial').html(),
            data
        );
    }
} );

这是github 上下划线 mixin的链接。

于 2012-11-09T22:33:16.103 回答
1

我认为这类似于戴夫的回答,但可能需要更少的代码:

function partialTemplate(origTemplate, partialValues){
    return function(values){
        return origTemplate(_.defaults(values, partialValues));
    };
}

示例用法:

var t = _.template('<%= val1 %>,<%= val2 %>'); // original template requiring 2 values
var pt = partialTemplate(t, {val1:1}); // partial template with 1 value pre-populated
pt({val2:2}); // returns '1,2'
pt({val2:3}); // returns '1,3'
于 2014-02-13T16:17:56.923 回答