Javascript模板引擎handlebars使用實例及技巧

時間 2020-06-08

標籤 javascript 模板引擎 handlebars 使用實例技巧欄目 JavaScript 简体版

原文原文鏈接

轉：http://rfyiamcool.blog.51cto.com/1030776/1278620javascript

咱們在開發的時候針對DOM操做，用簡單的JS應用來講不成問題，但若是你對視圖的每次更新都須要對我文檔中很是大量的塊進行操做呢？這時JS模版就派上用場了。html

源地址：http://rfyiamcool.blog.51cto.com/1030776/1278620前端

這是一個實例，咱們能夠把json的數據，按照本身的想法嵌入到模板裏面。java

<!DOCTYPE html>
<html>
  <head>
    <title>Handlebars Expressions Example</title>
  </head>
  <body>
    <h1>Handlebars Expressions Example!</h1>
<!--this is a list which will rendered by handlebars template.    -->
    <div id="list">
    </div>
                                                                                                                                                                                                                                                                                                                                                                                                           
    <script type="text/javascript" src=\'#\'" /jquery.js"></script>
    <script type="text/javascript" src=\'#\'" /handlebars-1.0.0.beta.6.js"></script>
                                                                                                                                                                                                                                                                                                                                                                                                           
    <script id="people-template" type="text/x-handlebars-template">
      {{#people}}
        <div class="person">
          <h2>{{first_name}} {{last_name}}</h2>
          <div class="phone">{{phone}}</div>
          <div class="email"><a href="mailto:{{email}}">{{email}}</a></div>
          <div class="since">User since {{member_since}}</div>
        </div>
      {{/people}}
    </script>
                                                                                                                                                                                                                                                                                                                                                                                                           
    <script type="text/javascript">
      $(document).ready(function() {
                                                                                                                                                                                                                                                                                                                                                                                                               
        // compile our template
        var template = Handlebars.compile($("#people-template").html());
                                                                                                                                                                                                                                                                                                                                                                                                               
        var data = {
          people: [
            { first_name: "rui", last_name: "fengyun", phone: "1234567890", email: "alan@test.com", member_since: "Mar 25, 2011" },
            { first_name: "Allison", last_name: "House", phone: "0987654321", email: "allison@test.com", member_since: "Jan 13, 2011" },
            { first_name: "Nick", last_name: "Pettit", phone: "9836592272", email: "nick@test.com", member_since: "Apr 9, 2009" },
            { first_name: "Jim", last_name: "Hoskins", phone: "7284927150", email: "jim@test.com", member_since: "May 21, 2010" },
            { first_name: "Ryan", last_name: "Carson", phone: "8263729224", email: "ryan@test.com", member_since: "Nov 1, 2008" }
          ]
        };
                                                                                                                                                                                                                                                                                                                                                                                                               
        $('#list').html(template(data));
      });
    </script>
  </body>
</html>

View Code

看到這個例子，你們感受很爽吧~ 就是這樣。。咱們能夠經過後端取數據，而後扔到前端，而不用寫各類 "" <> ''的分離符號。jquery

進行遍歷裏面的數據，print出來angularjs

<script id="each-template" type="text/x-handlebars-template">
  {{#each people}}
    ... output person's info here...
  {{/each}}
</script>

有數據的話，進行數據渲染ajax

<script id="each-template" type="text/x-handlebars-template">
  {{#if people}}
    ... output person's info here...
  {{/if}}
</script>

沒有數據的話，就寫沒有數據json

<script id="each-template" type="text/x-handlebars-template">
  {{#unless people.length}}
    There aren't any people.
  {{/unless}}
</script>

if else 關聯的判斷後端

<script id="each-template" type="text/x-handlebars-template">
  {{#if people.length}}
    ... output person's info here...
  {{else}}
    There aren't any people.
  {{/if}}
</script>

Handlebars.registerHelper('list', function (items, options)app

items是後面的key值，options是handlebars取值用的

 1 <!DOCTYPE html>
 2 <html>
 3   <head>
 4     <title>Handlebars Block Expressions Example</title>
 5   </head>
 6   <body>
 7     <h1>Handlebars Expressions Example!</h1>
 8 <!--this is a list which will rendered by handlebars template.    -->
 9     <div id="list">
10     </div>
11                                                                                                                                                                                           
12     <script type="text/javascript" src=\'#\'" /jquery.js"></script>
13     <script type="text/javascript" src=\'#\'" /handlebars-1.0.0.beta.6.js"></script>
14                                                                                                                                                                                           
15     <script id="people-template" type="text/x-handlebars-template">
16         {{#list people}}
17             {{first_name}} {{last_name}}  {{phone}} {{email}} {{member_since}}
18         {{/list}}
19     </script>
20                                                                                                                                                                                           
21     <script type="text/javascript">
22       $(document).ready(function() {
23                                                                                                                                                                                               
24         // compile our template
25         var template = Handlebars.compile($("#people-template").html());
26         Handlebars.registerHelper('list', function (items, options) {
27             var out = "<div>";
28             for (var i = 0, l = items.length; i < l; i++) {
29                 out = out + "<div>" + "<h5>"+options.fn(items[i])+"</h5>" + "</div> jiewei";
30             }
31             return out + "</div>";
32         });
33         var data = {
34           people: [
35             { first_name: "Alan", last_name: "Johnson", phone: "1234567890", email: "alan@test.com", member_since: "Mar 25, 2011" },
36             { first_name: "Allison", last_name: "House", phone: "0987654321", email: "allison@test.com", member_since: "Jan 13, 2011" },
37             { first_name: "Nick", last_name: "Pettit", phone: "9836592272", email: "nick@test.com", member_since: "Apr 9, 2009" },
38             { first_name: "Jim", last_name: "Hoskins", phone: "7284927150", email: "jim@test.com", member_since: "May 21, 2010" },
39             { first_name: "Ryan", last_name: "Carson", phone: "8263729224", email: "ryan@test.com", member_since: "Nov 1, 2008" }
40           ]
41         };
42                                                                                                                                                                                               
43         $('#list').html(template(data));
44       });
45     </script>
46   </body>
47 </html>

View Code

我在value加了div和h5的便籤，經過開發者用具能夠看到。

列表的話，有個和jinja2很像的格式。

<div id="list">
    </div>
                                                                                                                   
    <script type="text/javascript" src=\'#\'" /jquery.js"></script>
    <script type="text/javascript" src=\'#\'" /handlebars-1.0.0.beta.6.js"></script>
                                                                                                                   
    <script id="people-template" type="text/x-handlebars-template">
      {{#each people}}
        <div class="person">
            {{this}}
        </div>
      {{/each}}
    </script>
                                                                                                                   
    <script type="text/javascript">
        $(document).ready(function () {
            // compile our template
            var template = Handlebars.compile($("#people-template").html());
            var data = {
                people: [
              "Alan Johnson" ,
              "Allison House" ,
              "Nick Pettit",
              "Jim Hoskins",
              "Ryan Carson"
            ]
            };
            $('#list').html(template(data));
        });
    </script>

要是想動態的抓數據，那就用ajax來搞。

$("button").click(function(){
  $.getJSON("demo_ajax_json.js",function(result){
   //result 就是值
    });
  });
});

咱們能夠把把result的值扔到模板裏面~

$(document).ready(function() {
            $('#btn1').click(function() {
                $.ajax({
                    type: "POST",   //使用Post方式請求
                    contentType: "application/json",
                    url: "Default2.aspx/HelloWorld",
                    data: "{}",  //這裏是要傳遞的參數，格式爲 data: "{paraName:paraValue}",下面將會看到   
                    dataType: 'json',   //會返回Json類型
                    success: function(result) {     //回調函數，result，返回值
                        //result 是咱們須要的值。。。。
                    }
                });
            });
        });
        //有參數調用