javascript - Node JS losing for loop index variable -

-

this question has answer here:

when use simple loop access array values, index variable gets lost therefore unable access array. using index number instead of variable works not variable. annoying code ever.

/* jshint esnext: true, asi: true */ var neo4j = require('node-neo4j')   // create neo4j object var db = new neo4j(serveruri)  exports.addperson = (body, callback) => {  if (body.skills) {     var sentskills = body.skills      var arrayskills = sentskills.split(',') }else {     var sentskills  = [] }  const sentname = body.name const sentemail = body.email const sentusername = body.username const sentpassword = body.password const lecturerstatus = body.lecturer  db.readnodeswithlabelsandproperties('person',{ email: sentemail }, function (err, node) {   if (err) {     return console.log(err)   }   if (node.length > 0){     // user exists     callback({code:401,status:'failed',message:'person exsits name '+sentname,data:sentname})   }   else {     // insert new person       db.insertnode({       name: sentname,       email: sentemail,       skills: sentskills,       username: sentusername,       password: sentpassword,       lecturer: lecturerstatus   }, 'person', function (err, node) {     personnode = node     if (err) {       return console.log(err+1)     }     else {        // hate not working      // = 0 variable not accessible -> arrayskill[i]^.trim()      // error: cannot read property trim of undefined       console.log("success")       (i = 0; < arrayskills.length; i++){         arrayskills = body.skills.split(',')         db.cypherquery("match (s:skill {name:'"+arrayskills[i].trim()+"'}) return s", function(err, node){           if (err){             console.log("error1")             console.log(err)           }           else {             console.log(arrayskills[0])             if (node.data == '')             {               db.cypherquery("create (s:skill {name:'"+arrayskills[i].trim()+"'}) return s", function(err, node){                 if (err){                   console.log("error2")                   console.log(err)                 }                 else {                   console.log(node)                    db.cypherquery("match (p:person), (s:skill) p.name = '"+sentname.trim()+"' , s.name = '"+arrayskills[i].trim()+"' create (p)-[r:knows]->(s) return r", function(err, node){                     if (err){                       console.log("error3")                       console.log(err)                     }                     else {                        console.log(node)                       console.log("success")                     }                    })                 }               })             }           }         })          };      }         })        // output node data.     callback({code:201,status:'success',message:'person added in '+sentname+' found...',data:node})    } }) }

that's closure problem, fix have move $http call new function this.

for (i = 0; < arrayskills.length; i++){    var skills = body.skills.split(',');    dbquery(skills,i); // in function have write stuff got under arrayskills = body.skills.split(',')  }

Comments

Post a Comment

Popular posts from this blog

Django REST Framework perform_create: You cannot call `.save()` after accessing `serializer.data` -

-
i have following viewset: class artistprofileviewset(viewsets.modelviewset): queryset = artistprofile.objects.all() serializer_class = artistprofileserializer def perform_create(self, serializer): if serializer.is_valid(): serializer.save() with following serializers: class simpleartisttrackserializer(serializers.hyperlinkedmodelserializer): class meta: model = artisttrack fields = (...my fields...) class artistprofileserializer(serializers.hyperlinkedmodelserializer): owners = userserializer(many=true, required=false) tracks = simpleartisttrackserializer(many=true, required=false) class meta: model = artistprofile fields = (...my fields...) i getting following error: assertionerror: cannot call `.save()` after accessing `serializer.data`.if need access data before committing database inspect 'serializer.validated_data' instead. i don't see editing serializer.data object. th...
Read more

Why does Go error when trying to marshal this JSON? -

-
i'm trying rather simple example of trying decode json file structs using golang. however, when attempting error that json: cannot unmarshal object go value of type []main.track which don't understand. here's code in question, , json can found here . package main import ( "encoding/json" "fmt" "net/http" "os" ) // tracks group of track types type tracks struct { tracks []track } // track represents singular track type track struct { name string url string artist artist } // artist represents single artist type artist struct { name string mbid string url string } func main() { url := "http://ws.audioscrobbler.com/2.0/?method=geo.gettoptracks&api_key=c1572082105bd40d247836b5c1819623&format=json&country=netherlands" response, err := http.get(url) if err != nil { fmt.printf("%s\n", err) os.exit(1) } de...
Read more