javascript 如何在 jQuery UI 小部件中的 _init 和 _create 之间做出决定？
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How to decide between _init and _create in jQuery UI widget?
提问by Luke Maurer
I think I understand the difference between _createand _initin widget definitions (see for instance this question), but I'm still not certain about the purposefor the distinction. What sorts of setup tasks go in _create()or in _init()? What goes wrong if the widget author chooses the wrong one?
我想我理解小部件定义之间_create和之间的区别_init（例如参见这个问题），但我仍然不确定区分的目的。什么样的设置任务进入_create()或进入_init()？如果小部件作者选择了错误的，会出现什么问题？
回答by Dave Jarvis
From:
从：
- http://forum.jquery.com/topic/jquery-ui-1-8-use-of-init
- http://www.erichynds.com/jquery/tips-for-developing-jquery-ui-widgets/
- http://jqueryui.com/demos/dialog/
- http://forum.jquery.com/topic/jquery-ui-1-8-use-of-init
- http://www.erichynds.com/jquery/tips-for-developing-jquery-ui-widgets/
- http://jqueryui.com/demos/dialog/
Use
_createto build and inject markup, bind events, etc. Place default functionality in_init(). The dialog widget, for example, provides anautoOpenparameter denoting whether or not the dialog should be open once the widget is initialized; a perfect spot for_init()!
使用
_create来构建和注射标记，绑定事件，地点等默认功能_init()。例如，对话框小部件提供了一个autoOpen参数，表示在小部件初始化后是否应打开对话框；一个完美的地方_init()！
Also:
还：
The widget factory automatically fires the
_create()and_init()methods during initialization, in that order. At first glance it appears that the effort is duplicated, but there is a sight difference between the two. Because the widget factory protects against multiple instantiations on the same element,_create()will be called a maximum of one time for each widget instance, whereas_init()will be called each time the widget is called without arguments...
小部件工厂在初始化期间自动触发
_create()和_init()方法，按此顺序。乍一看似乎是重复的努力，但两者之间存在视觉差异。因为小部件工厂可以防止同一元素上的多个实例化，所以_create()每个小部件实例最多会被调用一次，而_init()每次不带参数调用小部件时都会被调用......
If the author uses _init()when _create()should have been coded, the result will be that the code in _init()will be executed once per widget instantiation.
如果作者使用_init()when _create()should have beencoded，结果将是_init()每次widget实例化都会执行一次in的代码。
回答by Franky Yang
Short answerhere: _create() will be executed when you run your jquery-ui plugin for the first time, like $xx.your-plugin(your options); _init() will be executed first and after the first timewhen your code runs into $xx.your-plugin(your options);
简短回答： _create() 将在您第一次运行 jquery-ui 插件时执行，例如 $xx.your-plugin(your options); _init() 将在您的代码第一次运行到 $xx.your-plugin(your options) 之后执行；
As there are some code in jquery-ui.custom.js like this:
因为 jquery-ui.custom.js 中有一些这样的代码：
var instance = $.data( this, fullName );
if ( instance ) {
instance.option( options || {} )._init();
}
So, if you draw a chartwith jquery-ui plugin, after it's drawn out, then you want to use new data to update it, you need to do this in _init() to update your chart. If you just display something and won't update them totally, _create() will meet your needs.
所以，如果你用jquery-ui插件绘制图表，绘制出来后，你想用新的数据来更新它，你需要在_init()中这样做来更新你的图表。如果你只是显示一些东西而不会完全更新它们， _create() 将满足你的需求。
