[英]Backbone custom event callback arguments
I'm attempting to pass an argument called newIndex in a custom event from one view to another using the trigger()
function. 我试图使用
trigger()
函数将自定义事件中名为newIndex的参数从一个视图传递到另一个视图。 Here's an excerpt from the first view: 这是第一个视图的节选:
var ProductListView = Backbone.View.extend({
el: '#products',
events:{
sortupdate: function(event, ui){
ui.item.trigger('moved', ui.item.index());
}
}
});
The element on which the 'moved' event is being triggered is another view. 触发“移动”事件的元素是另一个视图。 Here's an excerpt from that view:
这是该观点的摘录:
var ProductItemView = Backbone.View.extend({
events: {
moved: 'viewMoved'
},
initialize: function(){
_.bindAll(this, 'render', 'viewMoved');
},
viewMoved: function(newIndex){
anotherFunc(this.model, newIndex);
},
});
The issue I'm having is that in the anotherFunc()
call, the newIndex argument appears to be the event itself rather than the value that I passed in when I triggered the event. 我遇到的问题是,在
anotherFunc()
调用中,newIndex参数似乎是事件本身,而不是触发事件时传递的值。 If I adjust the viewMoved
callback to the following, it works correctly: 如果我将
viewMoved
回调调整为以下值,它将正常工作:
viewMoved: function(event, newIndex){
anotherFunc(this.model, newIndex);
},
Is this intended functionality? 这是预期的功能吗? Is the event itself always the first argument passed to a custom event's callback, or is something else going on here?
事件本身是否始终是传递给自定义事件的回调的第一个参数,还是这里发生了其他事情? If it's intended is this documented somewhere?
是否打算在某处记录此内容? I was unable to find any reference to this in the Backbone documentation.
我在主干文档中找不到对此的任何引用。
Backbone uses jQuery heavily under the hood, and your ui.item
is actually a jQuery object. Backbone在
ui.item
大量使用jQuery,而您的ui.item
实际上是jQuery对象。 See the documentation for the trigger function . 请参阅有关触发功能的文档。
In summary, you're using jQuery's trigger
because ui.item
is not a Backbone View. 总之,由于
ui.item
不是主干视图,因此您正在使用jQuery的trigger
。 Extra parameters are always passed after the event
object. 总是在
event
对象之后传递额外的参数。
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