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EmberJS 模板条件#if

2018-01-03 17:55 更新

描述

#if语句使用布尔表达式，如果布尔表达式为真，if语句中的代码块将被执行，如果为false，则将执行else代码块。

语句

<script type="text/x-handlebars">
   {{#if booleanExpression}}
      <!--Blocks-->
   {{else}}
      <!--Blocks-->
   {{/if}}
</script>

例子

<!DOCTYPE html>
<html>
   <head>
      <title>Emberjs if condition</title>
      <!-- CDN's -->
      <script src="https://cdnjs.cloudflare.com/ajax/libs/handlebars.js/3.0.1/handlebars.min.js"></script>
      <script src="https://code.jquery.com/jquery-2.1.3.min.js"></script>
      <script src="https://cdnjs.cloudflare.com/ajax/libs/ember.js/1.10.0/ember.min.js"></script>
      <script src="https://builds.emberjs.com/tags/v1.10.0-beta.3/ember-template-compiler.js"></script>
      <script src="https://builds.emberjs.com/release/ember.debug.js"></script>
      <script src="https://builds.emberjs.com/beta/ember-data.js"></script>
   </head>
   <body>
      <script type="text/x-handlebars">
         <!-- 'check' is the computed property function which is being invoked as boolean value -->
         {{#if check}}
         <!-- true block of statement -->
            <h3> boolean value is {{check}}</h3>
         {{else}}
         <!-- false block of statement -->
            <h3>boolean value is {{check}}</h3>
         {{/if}}
      </script>

      <script type="text/javascript">
         var App = Ember.Application.create()
         App.ApplicationController = Ember.Controller.extend({
            //initialize the boolean value
            bool: true,
            check: function(){
               //returning the boolean value to the called function
               return this.bool;
            }.property('content.check'),
         });
      </script>
   </body>
</html>

输出

让我们执行以下步骤，看看上面的代码如何工作：

将上面的代码保存在tmp_if_condition.html文件中
在浏览器中打开此HTML文件。

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