javascript - Delay directive/div until scope value available -


i have custom directive soundcloud requires soundcloud url. soundcloud url fetched database through $http service, however, div soundcloud custom directive loaded , requires value of soundcloud url before defined.

the plangular directive code got here: https://github.com/jxnblk/plangular/blob/master/src/plangular.js *i did not develop this

this html code:

<div plangular="{{soundcloud}}"> <button ng-click="playpause()">play/pause</button> <progress ng-value="currenttime / duration || 0"> {{ currenttime / duration || 0 }} </progress> </div>

and angular code:

displaysong.controller('song', ['$scope', '$http', 'fetchsong', function($scope, $http, fetchsong) {     $scope.songid     $scope.songname;      //controller properties     $scope.songpromise; //the song promise fetching      $scope.init = function(songid, userid) {         $scope.songid = songid;         $scope.userid = userid;         $scope.songpromise = $http({             method: "post",             url: fetchsong,             data: {                 song_id: $scope.songid             },             headers: { 'content-type': 'application/x-www-form-urlencoded' }         }).then(function(successresponse) {             console.log('successfully fetched song');             console.log(successresponse);             var song = successresponse.data;             $scope.songid = song.song_id;             $scope.songname = song.song_name;             $scope.songtype = song.song_type;             $scope.songembed = song.song_embed;             $scope.soundcloud = song.song_embed;         }, function(errorresponse) {             console.log('error fetching');             $scope.songid = null;         });     }; }]);

i know it's problem asynchronous nature because when add line in beginning of song controller:

$scope.soundcloud = "https://soundcloud.com/jshigley/shine";

it works fine. i've noticed when spam play/pause button come directive, multiple console errors of "http 404 not found", leads me believe it's trying find track of undefined url

since it's div directive , not function call can't use promises such chaining $scope.songpromise. i've thought of putting controller , having controller $timeout 5 seconds, don't think delays execution of dom.

the soundcloud url end getting loaded, remains undefined in eyes of plangular directive (i've encountered lots of these problems bad timing of loading scope , directives). angular wizards willing teach me how tame asynchronous nature of angularjs?

you can use $watch in custom directive watch when url attributes changed. in 

    link: function(scope, el, attr) {

change 

if (src) {     resolve({ url: src, client_id: client_id }, function(err, res) {       if (err) { console.error(err); }       scope.$apply(function() {         scope.track = createsrc(res);         if (array.isarray(res)) {           scope.tracks = res.map(function(track) {             return createsrc(track);           });         } else if (res.tracks) {           scope.playlist = res;           scope.tracks = res.tracks.map(function(track) {             return createsrc(track);           });         }       });     });   }

to

 scope.$watch('attr.plangular', function(newval) {      resolve({ url: attr.plangular, client_id: client_id }, function(err, res) {       if (err) { console.error(err); }       scope.$apply(function() {         scope.track = createsrc(res);         if (array.isarray(res)) {           scope.tracks = res.map(function(track) {             return createsrc(track);           });         } else if (res.tracks) {           scope.playlist = res;           scope.tracks = res.tracks.map(function(track) {             return createsrc(track);           });         }       });     });  }, true);

if dont want change directive might want use ng-if load plangular div when url.

<div plangular="{{soundcloud}}" ng-if="haveurl">

and in angular code : 

}).then(function(successresponse) {         console.log('successfully fetched song');         console.log(successresponse);         $scope.haveurl = true;

-

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