DataLoader¶
-
class
webix.DataLoader(data)¶ Arguments: - data (object) – A configuration object
Dataloader component.
References¶
- helpers
ajax(),bind(),delay(),dp(),extend(),proto(),toArray(),toFunctor().- mixins
AtomDataLoader(),DataStore().
Referenced by¶
- components
DataCollection().- views
chart(),datatable(),htmlform(),proto().
External references¶
Code¶
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$init:function(config){
//prepare data store
config = config || "";
//list of all active ajax requests
this._ajax_queue = webix.toArray();
this.data = new webix.DataStore();
this.data.attachEvent("onClearAll",webix.bind(this._call_onclearall,this));
this.data.attachEvent("onServerConfig", webix.bind(this._call_on_config, this));
this.attachEvent("onDestruct", this._call_onclearall);
this.data.feed = this._feed;
this.data.owner = config.id;
},
_feed:function(from,count,callback){
//allow only single request at same time
if (this._load_count)
return (this._load_count=[from,count,callback]); //save last ignored request
else
this._load_count=true;
this._feed_last = [from, count];
this._feed_common.call(this, from, count, callback);
},
_feed_common:function(from, count, callback, url, details){
var state = null,
url = url || this.data.url;
var final_callback = [
{ success: this._feed_callback, error: this._feed_callback },
callback
];
if (from<0) from = 0;
if(!details)
details = { start: from, count:count };
if(this.count())
details["continue"] = "true";
if (this.getState)
state = this.getState();
// proxy
if (url && typeof url != "string"){
if (state){
if (state.sort)
details.sort = state.sort;
if (state.filter)
details.filter = state.filter;
}
this.load(url, final_callback, details);
} else { // GET
url = url+((url.indexOf("?")==-1)?"?":"&");
var params = [];
for(var d in details){
params.push(d+"="+details[d]);
}
if (state){
if (state.sort)
params.push("sort["+state.sort.id+"]="+encodeURIComponent(state.sort.dir));
if (state.filter)
for (var key in state.filter){
var filterValue = state.filter[key];
if(typeof filterValue == "object")
filterValue = webix.ajax().stringify(filterValue); //server daterangefilter
params.push("filter["+key+"]="+encodeURIComponent(filterValue));
}
}
url += params.join("&");
this.load(url, final_callback);
}
},
_feed_callback:function(){
//after loading check if we have some ignored requests
var temp = this._load_count;
var last = this._feed_last;
this._load_count = false;
if (typeof temp =="object" && (temp[0]!=last[0] || temp[1]!=last[1]))
this.data.feed.apply(this, temp); //load last ignored request
},
//loads data from external URL
load:function(url,call){
var url = webix.proxy.$parse(url);
var ajax = webix.AtomDataLoader.load.apply(this, arguments);
//prepare data feed for dyn. loading
if (!this.data.url)
this.data.url = url;
return ajax;
},
//load next set of data rows
loadNext:function(count, start, callback, url, now){
var config = this._settings;
if (config.datathrottle && !now){
if (this._throttle_request)
window.clearTimeout(this._throttle_request);
this._throttle_request = webix.delay(function(){
this.loadNext(count, start, callback, url, true);
},this, 0, config.datathrottle);
return;
}
if (!start && start !== 0) start = this.count();
if (!count)
count = config.datafetch || this.count();
this.data.url = this.data.url || url;
if (this.callEvent("onDataRequest", [start,count,callback,url]) && this.data.url)
this.data.feed.call(this, start, count, callback);
},
_maybe_loading_already:function(count, from){
var last = this._feed_last;
if(this._load_count && last){
if (last[0]<=from && (last[1]+last[0] >= count + from )) return true;
}
return false;
},
removeMissed_setter:function(value){
return (this.data._removeMissed = value);
},
//init of dataprocessor delayed after all settings processing
//because it need to be the last in the event processing chain
//to get valid validation state
_init_dataprocessor:function(){
var url = this._settings.save;
if (url === true)
url = this._settings.save = this._settings.url;
var obj = { master: this };
if (url && url.url)
webix.extend(obj, url);
else
obj.url = url;
webix.dp(obj);
},
save_setter:function(value){
if (value)
this.$ready.push(this._init_dataprocessor);
return value;
},
scheme_setter:function(value){
this.data.scheme(value);
},
dataFeed_setter:function(value){
value = webix.proxy.$parse(value);
this.data.attachEvent("onBeforeFilter", webix.bind(function(text, filtervalue){
//complex filtering, can't be routed to dataFeed
if (typeof text == "function") return true;
//we have dataFeed and some text
if (this._settings.dataFeed && (text || filtervalue)){
text = text || "id";
if (filtervalue && typeof filtervalue == "object")
filtervalue = filtervalue.id;
this.clearAll();
var url = this._settings.dataFeed;
//js data feed
if (typeof url == "function"){
var filter = {};
filter[text] = filtervalue;
url.call(this, filtervalue, filter);
} else if (url.$proxy) {
if (url.load){
var filterobj = {}; filterobj[text] = filtervalue;
url.load(this, {
success: this._onLoad,
error: this._onLoadError
}, { filter: filterobj });
}
} else {
//url data feed
var urldata = "filter["+text+"]="+encodeURIComponent(filtervalue);
this.load(url+(url.indexOf("?")<0?"?":"&")+urldata, this._settings.datatype);
}
return false;
}
},this));
return value;
},
_call_onready:function(){
if (this._settings.ready && !this._ready_was_used){
var code = webix.toFunctor(this._settings.ready, this.$scope);
if (code)
webix.delay(code, this, arguments);
if (this.callEvent)
webix.delay(this.callEvent, this, ["onReady", []]);
this._ready_was_used = true;
}
},
_call_onclearall:function(){
for (var i = 0; i < this._ajax_queue.length; i++){
var xhr = this._ajax_queue[i];
//IE9 and IE8 deny extending of ActiveX wrappers
try { xhr.aborted = true; } catch(e){
webix._xhr_aborted.push(xhr);
}
xhr.abort();
}
this._load_count = false;
this._ajax_queue = webix.toArray();
this.waitData = webix.promise.defer();
},
_call_on_config:function(config){
this._parseSeetingColl(config);
}
},webix.AtomDataLoader);
//ie8 compatibility
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