jQuery技巧之让任何组件都支持类似DOM的事件管理

define(function(require, exports, module) {
var $ = require('jquery');
var Class = require('./class');
function isFunc(f) {
return Object.prototype.toString.apply(f) === '[object Function]';
}
/**
* 这个基类可以让普通的类具备事件驱动的能力
* 提供类似jq的on off trigger方法，不考虑one方法，也不考虑命名空间
* 举例：
* var e = new EventBase();
* e.on('load', function(){
* console.log('loaded');
* });
* e.trigger('load');//loaded
* e.off('load');
*/
var EventBase = Class({
instanceMembers: {
init: function () {
this.events = {};
//把$.Callbacks的flag设置成一个实例属性，以便子类可以覆盖
this.CALLBACKS_FLAG = 'unique';
},
on: function (type, callback) {
type = $.trim(type);
//如果type或者callback参数无效则不处理
if (!(type && isFunc(callback))) return;
var event = this.events[type];
if (!event) {
//定义一个新的jq队列，且该队列不能添加重复的回调
event = this.events[type] = $.Callbacks(this.CALLBACKS_FLAG);
}
//把callback添加到这个队列中，这个队列可以通过type来访问
event.add(callback);
},
off: function (type, callback) {
type = $.trim(type);
if (!type) return;
var event = this.events[type];
if (!event) return;
if (isFunc(callback)) {
//如果同时传递type跟callback，则将callback从type对应的队列中移除
event.remove(callback);
} else {
//否则就移除整个type对应的队列
delete this.events[type];
}
},
trigger: function () {
var args = [].slice.apply(arguments),
type = args[0];//第一个参数转为type
type = $.trim(type);
if (!type) return;
var event = this.events[type];
if (!event) return;
//用剩下的参数来触发type对应的回调
//同时把回调的上下文设置成当前实例
event.fireWith(this, args.slice(1));
}
}
});
return EventBase;
});

define(function(require, exports, module) {
var $ = require('jquery');
var Class = require('./class');
var EventBase = require('./eventBase');
var DEFAULTS = {
data: [], //要展示的数据列表，列表元素必须是object类型的，如[{url: 'xxx.png'},{url: 'yyyy.png'}]
sizeLimit: 0, //用来限制BaseView中的展示的元素个数，为0表示不限制
readonly: false, //用来控制BaseView中的元素是否允许增加和删除
onBeforeRender: $.noop, //对应beforeRender事件，在render方法调用前触发
onRender: $.noop, //对应render事件，在render方法调用后触发
onBeforeAppend: $.noop, //对应beforeAppend事件，在append方法调用前触发
onAppend: $.noop, //对应append事件，在append方法调用后触发
onBeforeRemove: $.noop, //对应beforeRemove事件，在remove方法调用前触发
onRemove: $.noop //对应remove事件，在remove方法调用后触发
};
/**
* 数据解析，给每个元素的添加一个唯一标识_uuid，方便查找
*/
function resolveData(ctx, data){
var time = new Date().getTime();
return $.map(data, function(d){
d._uuid = '_uuid' + time + Math.floor(Math.random() * 100000);
});
}
var FileUploadBaseView = Class({
instanceMembers: {
init: function (options) {
this.base();
this.options = this.getOptions(options);
},
getOptions: function(options) {
return $.extend({}, DEFAULTS, options);
},
render: function(){
},
append: function(data){
},
remove: function(prop){
}
},
extend: EventBase
});
return FileUploadBaseView;
});

define(function(require, exports, module) {
var $ = require('jquery');
var Class = require('./class');
/**
* 这个基类可以让普通的类具备jquery对象的事件管理能力
*/
var EventBase = Class({
instanceMembers: {
init: function (_jqObject) {
this._jqObject = _jqObject && _jqObject instanceof $ && _jqObject || $({});
},
on: function(){
return $.fn.on.apply(this._jqObject, arguments);
},
one: function(){
return $.fn.one.apply(this._jqObject, arguments);
},
off: function(){
return $.fn.off.apply(this._jqObject, arguments);
},
trigger: function(){
return $.fn.trigger.apply(this._jqObject, arguments);
}
}
});
return EventBase;
});

define(function(require, exports, module) {
var $ = require('jquery');
var Class = require('mod/class');
var EventBase = require('mod/eventBase');
var Demo = window.demo = Class({
instanceMembers: {
init: function (element,options) {
this.$element = $(element);
this.base(this.$element);
//添加监听
this.on('beforeRender', $.proxy(options.onBeforeRender, this));
this.on('render', $.proxy(options.onRender, this));
},
render: function () {
//触发beforeRender事件
var e = $.Event('beforeRender');
this.trigger(e);
if(e.isDefaultPrevented())return;
//主要逻辑代码
console.log('render complete!');
//触发render事件
this.trigger('render');
}
},
extend: EventBase
});
var demo = new Demo('#demo', {
onBeforeRender: function(e) {
console.log('beforeRender event triggered!');
},
onRender: function(e) {
console.log('render event triggered!');
}
});
demo.render();
});

define(function(require, exports, module) {
var $ = require('jquery');
var Class = require('mod/class');
var EventBase = require('mod/eventBase');
var Demo = window.demo = Class({
instanceMembers: {
init: function (element,options) {
this.$element = $(element);
this.base(this.$element);
//添加监听
this.on('beforeRender', $.proxy(options.onBeforeRender, this));
this.on('render', $.proxy(options.onRender, this));
},
render: function () {
//触发beforeRender事件
var e = $.Event('beforeRender');
this.trigger(e);
if(e.isDefaultPrevented())return;
//主要逻辑代码
console.log('render complete!');
//触发render事件
this.trigger('render');
}
},
extend: EventBase
});
var demo = new Demo('#demo', {
onBeforeRender: function(e) {
console.log('beforeRender event triggered!');
},
onRender: function(e) {
console.log('render event triggered!');
}
});
demo.on('beforeRender', function(e) {
e.preventDefault();
console.log('beforeRender event triggered 2!');
});
demo.on('beforeRender', function(e) {
console.log('beforeRender event triggered 3!');
});
demo.render();
});

define(function(require, exports, module) {
var $ = require('jquery');
var Class = require('mod/class');
var EventBase = require('mod/eventBase');
var Demo = window.demo = Class({
instanceMembers: {
init: function (options) {
this.base();
//添加监听
this.on('beforeRender', $.proxy(options.onBeforeRender, this));
this.on('render', $.proxy(options.onRender, this));
},
render: function () {
//触发beforeRender事件
var e = $.Event('beforeRender');
this.trigger(e);
if(e.isDefaultPrevented())return;
//主要逻辑代码
console.log('render complete!');
//触发render事件
this.trigger('render');
}
},
extend: EventBase
});
var demo = new Demo({
onBeforeRender: function(e) {
console.log('beforeRender event triggered!');
},
onRender: function(e) {
console.log('render event triggered!');
}
});
demo.render();
});

define(function(require, exports, module) {
var $ = require('jquery');
var Class = require('mod/class');
var EventBase = require('mod/eventBase');
var Demo = window.demo = Class({
instanceMembers: {
init: function (options) {
this.base();
//添加监听
this.on('beforeRender', $.proxy(options.onBeforeRender, this));
this.on('render', $.proxy(options.onRender, this));
},
render: function () {
//触发beforeRender事件
var e = $.Event('beforeRender');
this.trigger(e);
if(e.isDefaultPrevented())return;
//主要逻辑代码
console.log('render complete!');
//触发render事件
this.trigger('render');
}
},
extend: EventBase
});
var demo = new Demo({
onBeforeRender: function(e) {
console.log('beforeRender event triggered!');
},
onRender: function(e) {
console.log('render event triggered!');
}
});
demo.on('beforeRender', function(e) {
e.preventDefault();
console.log('beforeRender event triggered 2!');
});
demo.on('beforeRender', function(e) {
console.log('beforeRender event triggered 3!');
});
demo.render();
});