将参数传递到骨干视图的Backbone事件对象

Question

我有一个Backbone View的以下事件。 它是一个产品视图 - 有三个标签（“All”，“Top 3”，“Top 5”）

我可以以某种方式将参数传递给方法声明，以便它等效于以下（这不起作用）？

events : {
    "click #top-all":          "topProducts(1)"
    "click #top-three":      "topProducts(2)"
    "click #top-ten":         "topProducts(3)"
},
topProducts(obj){
    // Do stuff based on obj value
}

Answer 1

您可以将额外参数放在可点击项目的数据属性中; 这样的事情：

<a id="top-all" data-pancakes="1">

然后topProducts可以自己解决：

topProducts: function(ev) {
    var pancakes = $(ev.currentTarget).data('pancakes');
    // And continue on as though we were called as topProducts(pancakes)
    // ...
}

Answer 2

我通常喜欢做这样的事情：

events : {
   "click #top-all":    function(){this.topProducts(1);}
   "click #top-three":  function(){this.topProducts(2);}
   "click #top-ten":    function(){this.topProducts(3);}
},
topProducts(obj){
   // Do stuff based on obj value
}

Answer 3

你可以做的，只是检查在参数中作为currentTarget接收的元素的id。

topProduct: function (e) {
    var id = e.currentTarget.id;
    if (id == "top-all") // Do something
    else if (id == "top-5") // Do something
    else if (id == "top-3") // Do something
}

Answer 4

你可以使用闭包来做到这一点：

EventObject.on(event, (function(){
    var arg = data; // Closure preserves this data
    return function(){
        doThis(arg);
    }   
})());