January 2013
Intermediate to advanced
332 pages
5h 23m
Chinese
Content preview from JAVASCRIPT網頁應用程式設計
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Backbone 函式庫
|
207
如果想讓檢視器和網頁上某個已存在的元件綁在一起，可以直接設定
el
屬性值。不過
得要等到網頁內容載入完成後，才能設定，否則在設定
el
時可能會找不到該網頁元件：
var UserView = Backbone.View.extend({
el: $(".users")
});
也可以在建立檢視器的物件實體時傳入
el
，就像傳入其他類似
tagName
、
className
，以
及
id
等屬性值一樣：
new UserView({id: "followers"});
產生檢視器內容
每個檢視器裡都有一組
render()
函式，它預設是 no-op（no operation，也就是沒有實作
內容的空白函式）。每當你需要重新產生檢視器內容時，都應該要呼叫這個函式。如果
想要針對檢視器實作某些特定功能、針對產生中的模版內容進行處理，或是更新
el
裡
的 HTML 程式碼，就要覆寫這個函式：
var TodoView = Backbone.View.extend({
template: _.template($("#todo-template").html()),
render: function() {
$(this.el).html(this.template(this.model.toJSON()));
return this;
}
});
Backbone 並不會限制你用何種方式來產生檢視器的內容，你可以完全自己產生網頁
元件內容，也可以利用模版函式庫（templating library ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.