javascript - Get node of data from firebase -


i'm trying data firebase , i'm little stuck that. enter image description here

i'm trying semaa data did not give me nothing

firebase.database().ref('courses/'+departmentid+'/sema'),

i can specific (but don't want it)

firebase.database().ref('courses/'+departmentid+'/sema/java'),

i wnated black sign , red sign in 2 different queries , run loop data there enter image description here

if you're looking loop on courses in semester:

var semesterref = firebase.database().ref('courses/'+departmentid+'/sema') semesterref.on('child_added', function(coursesnapshot) {     console.log(coursesnapshot.key); });

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