javascript - How to dynamically create Firebase select query? -

-

i need information firebase database through filters applied checkbox.

i have courses , user has options. can choose more 1 option don't know how required information when chooses options , presses okay. don't want retrieve courses data; data selected options.

i explain in more detail in photo:

enter image description here

that's code firebase. i'm looking query dynamically in ionic 2 app

 public getcourseslist(){ // write here?? , want assignment objects in this.coursesa  return new promise(resolve => {   let coursea = [];   this.coursesdata.getcourseslist(this.department.id).map( eachsnapshot => {     eachsnapshot.on('child_added',function(coursesnapshot){       coursesnapshot.foreach(function(snap):boolean{           let coursedetails = {           class:snap.val().class,           coursename: snap.val().coursename,           start:snap.val().start,           end:snap.val().end,           lecture: snap.val().lecture,         };         console.log("ad"+coursedetails);         this.coursesa.push(coursedetails);         return false;       });      });   });


Comments

Post a Comment

Popular posts from this blog

asp.net - How to correctly use QUERY_STRING in ISAPI rewrite? -

-
i'm having difficult time , hope guys can help. using helicon isapi rewrite version 3.1.0.104 on our iis server. edit http.conf file , have tried , still fail. this trying do: redirect url: https://www.domain.com/switch-by-version?version=2.8.5.2594 to: https://test.domain.com/load/load.aspx?tver=2.8.5.2594 the version number @ end source url change, , need target url have same version number @ end of url example above shows. i tried following not work: rewritecond %{query_string} ^version=(\d\d?)\.(\d\d?)\.(\d\d?)\.(.*)$ [nc] rewriterule ^/switch-by-version(.*)$ https://test.domain.com/load/load.aspx?tver=%1 [r=307,nc,l] any appreciated! thanks. if it's running in equivalent context of .htaccess , rule shouldn't start / . here's simpler version: rewritecond %{query_string} ^version=(\d+\.\d+\.\d+(?:\..+)?)$ [nc] rewriterule ^switch-by-version/?$ https://test.domain.com/load/load.aspx?tver=%1 [r=307,nc,l]
Read more

jsf - "PropertyNotWritableException: Illegal Syntax for Set Operation" error when setting value in bean -

-
this question has answer here: how send form input values , invoke method in jsf bean 1 answer i error when trying send values jsf page bean. i want set values fields in bean, create airplane instance , add database. error telling me use illegal syntax setter part of bean. why error? didnt find on site helped me problem. here jsf part: <h4>add plane</h4> <c:if test="#{not empty listairplanebb.error}"> <div class="alert alert-danger"> <span class="glyphicon glyphicon-remove"></span> <h:outputtext value="#{listairplanebb.error}" /> </div> </c:if> <h:form> <table class="table"> <thead> ...
Read more

laravel - Undefined property: Illuminate\Pagination\LengthAwarePaginator::$id (View: F:\project\resources\views\admin\carousels\index.blade.php) -

-
when try pass variable data view error, can't find document problem controller(carouselcontroller.php) public function index() { $carousels = carousel::orderby('created_at', 'asc')->paginate(12); return view('admin.carousels.index')->withcarousels($carousels); } my view(index.blade.php) <div class="row"> <div class="col-md-9"> <h1>all images</h1> </div> <div class="col-md-3"> <a href="{{ route('carousels.create') }}" class="btn btn-lg btn-block btn-primary ">create new carousel</a> </div> <div class="col-md-12"> <hr> </div> </div>{{-- end of row --}} <div class="row"> <div class="col-md-12"> <div class="row"> @foreach($carousels $photo) <div class="col-xs-6 col-md...
Read more