为什么我的 CoffeeScript/backbone.js 事件没有触发?

发布于 2024-10-01 00:32:07 字数 1197 浏览 4 评论 0原文

我正在尝试熟悉 CoffeeScript 和backbone.js,但我一定错过了一些东西。

此 CoffeeScript:

MyView  = Backbone.View.extend 
   events: { 
     "click" : "testHandler" 
   } 

   testHandler: -> 
     console.log "click handled" 
     return false 

 view = new MyView {el: $('#test_container')} 
 view.render()

生成以下 JavaScript:

(function() {
  var MyView, view;
  MyView = Backbone.View.extend({
    events: {
      "click": "testHandler"
    },
    testHandler: function() {
      console.log("click handled");
      return false;
    }
  });
  view = new MyView({
    el: $('#test_container')
  });
  view.render;
}).call(this);

但是当我单击 test_container 时,click 事件不会触发 testHandler

如果我将输出 JavaScript 更改为:

$(function() {
  var MyView, view;
  MyView = Backbone.View.extend({
    events: {
      "click": "testHandler"
    },
    testHandler: function() {
      console.log("click handled");
      return false;
    }
  });
  view = new MyView({
    el: $('#test_container')
  });
  view.render;
});

删除 call(this) 并附加 $,一切都会按预期工作。我缺少什么?

I'm trying to familiarize myself with CoffeeScript and backbone.js, and I must be missing something.

This CoffeeScript:

MyView  = Backbone.View.extend 
   events: { 
     "click" : "testHandler" 
   } 

   testHandler: -> 
     console.log "click handled" 
     return false 

 view = new MyView {el: $('#test_container')} 
 view.render()

Generates the following JavaScript:

(function() {
  var MyView, view;
  MyView = Backbone.View.extend({
    events: {
      "click": "testHandler"
    },
    testHandler: function() {
      console.log("click handled");
      return false;
    }
  });
  view = new MyView({
    el: $('#test_container')
  });
  view.render;
}).call(this);

But the click event does not fire testHandler when I click in test_container.

If I change the output JavaScript to:

$(function() {
  var MyView, view;
  MyView = Backbone.View.extend({
    events: {
      "click": "testHandler"
    },
    testHandler: function() {
      console.log("click handled");
      return false;
    }
  });
  view = new MyView({
    el: $('#test_container')
  });
  view.render;
});

Removing the call(this) and appending the $, everything works as expected. What am I missing?

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评论(4

梦旅人picnic 2024-10-08 00:32:07
(function () {}).call(this);

只是一种在指定接收者时立即调用匿名函数的方法。它的工作方式基本上与:

this.method = function () {};
this.method();

$(function () {}) 相同,至少在 jQuery 中是这样,

$(document).ready(function () {})

它是在 DOM 树完全构建后运行给定函数的简写。看来这是您的 Backbone.View.extend 函数正常工作的必要条件。

(function () {}).call(this);

is just a way to immediately invoke an anonymous function while specifying a receiver. It works basically this same way as:

this.method = function () {};
this.method();

$(function () {}), at least in jQuery, is shorthand for

$(document).ready(function () {})

which runs the given function when the DOM tree has been fully constructed. It seems like this is the necessary condition for your Backbone.View.extend function to work properly.

热血少△年 2024-10-08 00:32:07

要将 CoffeeScript 和 jQuery 一起用于应用程序脚本,请将代码放入此类模板中:

$ = jQuery
$ ->

  MyView = Backbone.View.extend
    events:
      "click": "testHandler"
    testHandler: ->
      console.log "click handled"
      false

  view = new MyView el: $('#test_container')
  view.render()

For using CoffeeScript and jQuery together for application scripts, put your code in this sort of template:

$ = jQuery
$ ->

  MyView = Backbone.View.extend
    events:
      "click": "testHandler"
    testHandler: ->
      console.log "click handled"
      false

  view = new MyView el: $('#test_container')
  view.render()
黎歌 2024-10-08 00:32:07

尝试使用 CoffeeScript 类声明语法,例如:

class BacklogView extends Backbone.View
  constructor: (@el) ->
    this.delegateEvents this.events

  events:
    "click" : "addStory"

  # callbacks
  addStory: ->
    console.log 'it works!'

Try using CoffeeScript class declaration syntax, e.g.:

class BacklogView extends Backbone.View
  constructor: (@el) ->
    this.delegateEvents this.events

  events:
    "click" : "addStory"

  # callbacks
  addStory: ->
    console.log 'it works!'
三生殊途 2024-10-08 00:32:07

当视图或至少 view.el 动态生成时会发生什么?您可以调用 view.delegateEvents() 方法来手动设置事件处理程序。

这是类似的咖啡脚本,用于在 ParentView 中渲染 ChildView,然后委托 childView 的事件。

window.ParentView = Backbone.View.extend
  addOne: (thing) ->
    view = new ChildView({model: thing})
    this.el.append view.render().el 
    view.delegateEvents()

What happens when the view, or at least view.el is dynamically generated? You can call the view.delegateEvents() method to manually set the eventhandlers.

Here's similar coffeescript for rendering a ChildView in a ParentView then delegating the childView's events.

window.ParentView = Backbone.View.extend
  addOne: (thing) ->
    view = new ChildView({model: thing})
    this.el.append view.render().el 
    view.delegateEvents()
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