How to sort firebase getDownloadURL() results with javascript? -


this function displaying images firebase urls:

function updatetimeline(){     var ul = document.queryselector("#timeline ul");     ul.innerhtml = "";     var db = firebase.database().ref("phoodos/");     var list = db.orderbychild("timestamp");     list.on("child_added", function(child) {         var selfie = child.val();          // retrieve image file         var storageref = firebase.storage().ref();         var imageref = storageref.child(selfie.path);          imageref.getdownloadurl().then(function(url){             var li = "<li><figure>";             li += "<img src='" + url + "' width='100%' alt='phoodo'>";             li += "<figcaption>by " + selfie.user + ": " + selfie.timestamp + "</figcaption>";             li += "</figure></li>";             ul.innerhtml += li;         })     }); }

results of orderbychild sorted, results getdownloadurl() not sorted.

how can sort images retrieved getdownloadurl() before adding html?

one trick insert html in correct order:

var ul = document.queryselector("#timeline ul"); ul.innerhtml = ""; var db = firebase.database().ref("phoodos/"); var list = db.orderbychild("timestamp"); list.on("child_added", function(child) {     var selfie = child.val();      // retrieve image file     var storageref = firebase.storage().ref();     var imageref = storageref.child(selfie.path);      var li = document.createelement("li");     ul.appendchild(li); // ensures <li> in right order      imageref.getdownloadurl().then(function(url){         var html = "<figure>";         html += "<img src='" + url + "' width='100%' alt='phoodo'>";         html += "<figcaption>by " + selfie.user + ": " + selfie.timestamp + "</figcaption>";         html += "</figure>";         li.innerhtml = html;     }) });

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