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evented.js
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evented.js
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if (jQuery) {
Evented = function(params) {
params = jQuery.extend({
'pull_interval': 0,
'token': 0
}, params);
var result = {
'_params': {},
'_handlers': {},
'_global_handlers': [],
'_timeout': 0,
'_last_state': 0,
'_pulling': false,
'_token': 0,
_init: function(params) {
this._params = params;
this._token = params.token;
var _this = this;
if (params.pull_interval) {
this._timeout = setTimeout(function() {
_this.pull();
}, params.pull_interval);
}
},
_ajax_handler: function(data) {
var parsed = JSON.parse(data.responseText);
this._last_state = parsed.state;
this._token = parsed.token;
var events = parsed.events;
for(var i in events) {
var event_data = {
'event': events[i].event,
'data': events[i].data,
'local': false
}
this._trigger(event_data);
}
var _this = this;
this._timeout = setTimeout(function() {
_this.pull();
}, this._params.pull_interval);
this._pulling = false;
},
pull: function() {
if (this._pulling) {
return;
}
this._pulling = true;
jQuery.ajax({
'type': 'GET',
'url': this._params.url,
'data': {
'state': this._last_state,
'token': this._token
},
'context': this,
'complete': this._ajax_handler
});
},
bind: function(event, cb) {
if (event == null) {
this._global_handlers.push(cb);
return;
}
if (typeof(this._handlers[event]) == 'undefined') {
this._handlers[event] = [];
}
this._handlers[event].push(cb);
},
_trigger: function(event_data) {
var event = event_data.event;
for(var i in this._handlers[event]) {
var h = this._handlers[event][i];
if (typeof(h) == 'function') {
if (h(event_data)) {
return;
}
} else if(typeof(h) == 'object') {
if (h.cb.apply(h.context, [event_data])) {
return;
}
}
}
for(var i in this._global_handlers) {
var h = this._global_handlers[i];
if (typeof(h) == 'function') {
if (h(event_data)) {
return;
}
} else if(typeof(h) == 'object') {
if (h.cb.apply(h.context, [event_data])) {
return;
}
}
}
},
trigger: function(event, data, send) {
var event_data = {'event':event, 'data':data, 'local': true};
this._trigger(event_data);
if ((typeof(send) == 'undefined') || send) {
jQuery.ajax({
'type': 'POST',
'url': this._params.url,
'data': {
'events': [event_data],
'state': this._last_state,
'token': this._token
},
'context': this,
'complete': this._ajax_handler
});
}
}
}
result._init(params);
return result;
}
} else {
console.log("Can't init evented.js since jQuery is not available");
}