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1 line
1.8 KiB
JavaScript
1 line
1.8 KiB
JavaScript
function LazyDataLoader(c){var a=this,d="loaded.new",b="complete";ERROR_EVENT="error";jQuery.extend(a,LoggableMixin);jQuery.extend(a,{total:undefined,url:undefined,currentIntervalId:undefined,data:[],delay:4000,start:0,size:4000,initialize:function(e){jQuery.extend(a,e);if(e.hasOwnProperty("initialize")){e.initialize.call(a,e)}this.log(this+" initialized:",a)},buildUrl:function(f,e){return this.url+"&"+jQuery.param({start_val:f,max_vals:e})},ajaxErrorFn:function(g,e,f){console.error("ERROR fetching data:",f)},converters:{"* text":window.String,"text html":true,"text xml":jQuery.parseXML,"text json":jQuery.parseJSON},load:function(h){this.log(this+".load");if(!a.url){throw (a+" requires a url")}if(this.total===null){this.log("\t total is null (will load all)")}else{this.log("\t total:",this.total)}var g=a.size;if((a.total!==null)&&(a.total<a.size)){g=a.total}a.log(a+"\t beginning recursion");f(a.start,g);function f(k,j){a.log(a+".loadHelper, start:",k,"size:",j);var i=a.buildUrl(k,j);a.log("\t url:",i);jQuery.ajax({url:a.buildUrl(k,j),converters:a.converters,dataType:"json",error:function(n,l,m){a.log("\t ajax error, status:",l,"error:",m);if(a.currentIntervalId){clearInterval(a.currentIntervalId)}$(a).trigger(ERROR_EVENT,[l,m]);a.ajaxErrorFn(n,l,m)},success:function(l){a.log("\t ajax success, response:",l,"next:",m,"remainder:",n);if(l!==null){a.data.push(l);$(a).trigger(d,[l,k,j]);var m=k+j,n=a.size;if(a.total!==null){n=Math.min(a.total-m,a.size)}a.log("\t next recursion, start:",m,"size:",n);if(a.total===null||n>0){a.currentIntervalId=setTimeout(function(){f(m,n)},a.delay);a.log("\t currentIntervalId:",a.currentIntervalId)}else{e()}}else{e()}}})}function e(){a.log(a+".loadHelper, has finished:",a.data);$(a).trigger(b,[a.data,a.total]);if(h){h(a.data)}}},toString:function(){return"LazyDataLoader"}});a.initialize(c);return a}; |