EmberJS 模板条件#unless
描述
它只执行错误的语句块。
语句
{{#unless falsy_condition}}
<!--Block of statment-->
{{/unless}}
例子
<!DOCTYPE html>
<html>
<head>
<title>Emberjs unless 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">
<!-- checks for the false condition and displays the appropriate message -->
{{#unless check}}
<h3> boolean value is {{check}}</h3>
{{/unless}}
</script>
<script type="text/javascript">
var App = Ember.Application.create()
App.ApplicationController = Ember.Controller.extend({
<!-- defining falsy value for the bool -->
bool: false,
check: 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_unless_condition.html文件中
在浏览器中打开此HTML文件。