angular - Iframes automatically refresh when interacting with form - Ionic2/Firebase -


i making simple messaging app embeds multiple spotify widgets using iframe. url song stored in firebase , needs encoded & sanitized before displaying. when interact form widgets refresh. there way prevent refresh? believe issue fetching sanitized url using function, not know how fix.

constructor(public navctrl: navcontroller, public navparams: navparams, af: angularfire, messagedata: messageprovider,               public channelprovider: channelprovider, public spotifyprovider: spotifyprovider, public authprovider: authprovider,               public messageprovider: messageprovider, public sanitizer: domsanitizer, private formbuilder: formbuilder) {     this.channel = navparams.data.channel || {$key: 1};     this.items = af.database.list('/channels/' + this.channel.$key);     this.items.subscribe(x => {       this.content && this.content.scrolltobottom(0)     });     this.messageform = this.formbuilder.group({       message: ['', validators.required],     });   }    encodeuri(uri) {     let url = `https://embed.spotify.com/?uri=${encodeuricomponent(uri)}`;     return this.sanitizer.bypasssecuritytrustresourceurl(url);   } 
<ion-row *ngif="item.detail?.spotifyuri" class="spotifyplayer">    <iframe [src]='encodeuri(item.detail.spotifyuri)' width="100%" height="380" frameborder="0" allowtransparency="true"></iframe> </ion-row>


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