Ember Handlebars幫助視圖未更新

Question

我正在嘗試使用Handlebars幫助，但幫助視圖未得到更新。

的觀點，

<script type="text/x-handlebars"> 
    {{#view App.NumberView}} 
    <button {{action changeNumber}}>Change number</button><br> 
    {{formatNumber view.number}} <br> 
    {{view.number}} 
    {{/view}} 
</script>​ 

的代碼，

App = Ember.Application.create({}); 

App.NumberView = Ember.View.extend({ 
    number: 5, 
    changeNumber: function(e) { 
    this.set('number', this.get('number') + 1); 
    }  
}); 

Em.Handlebars.registerHelper('formatNumber', function(timePath, options) { 
    var number = Em.Handlebars.getPath(this, timePath, options); 
    return new Handlebars.SafeString("Formated number: " + number); 
}); 

中的jsfiddle http://jsfiddle.net/LP7Hz/1/

那麼，什麼是錯的活生生的例子？

Answer 1

因爲把手傭工餘燼未結合的幫手。從@Jo http://techblog.fundinggates.com/blog/2012/08/ember-handlebars-helpers-bound-and-unbound/：所以，你可以實例化輔助視圖是這樣做的提琴：

http://jsfiddle.net/secretlm/qfNJw/2/

HTML：

<script type="text/x-handlebars"> 
    {{#view App.NumberView}} 
     <button {{action changeNumber}}>Change number</button><br> 
     {{formatNumber view.number}} <br> 
     {{view.number}} 
    {{/view}} 
</script>​ 

的Javascript：

App = Ember.Application.create({}); 

App.NumberView = Ember.View.extend({ 
    number: 5, 
    changeNumber: function(e) { 
     this.set('number', this.get('number') + 1); 
    }  
}); 


App.registerViewHelper = function(name, view) { 
    Ember.Handlebars.registerHelper(name, function(property, options) { 
    options.hash.contentBinding = property; 
    return Ember.Handlebars.helpers.view.call(this, view, options); 
    }); 
}; 


inlineFormatter = function(fn) { 
    return Ember.View.extend({ 
    tagName: 'span', 

    template: Ember.Handlebars.compile('{{view.formattedContent}}'), 

    formattedContent: (function() { 
     if (this.get('content') != null) { 
     return fn(this.get('content')); 
     } 
    }).property('content') 
    }); 
}; 


App.registerViewHelper('formatNumber', inlineFormatter(function(content) { 

    return new Handlebars.SafeString("Formated number: " + content); 
})); 

這個環節是非常有用的Liss

Answer 2

您正在尋找一個不存在的綁定助手。有一個Pull Request和相關的討論。

Answer 3

我覺得這是計算器上類似的問題，涉及到綁定的輔助檢查此鏈接Writing a helper that produces bound results?