windows 10 pro office 2019 pro office 365 pro windows 10 home windows 10 enterprise office 2019 home and business office 2016 pro windows 10 education visio 2019 microsoft project 2019 microsoft project 2016 visio professional 2016 windows server 2012 windows server 2016 windows server 2019 Betriebssysteme office software windows server instagram takipçi instagram beğeni instagram görüntüleme instagram otomatik beğeni facebook beğeni facebook sayfa beğenisi facebook takipçi twitter takipçi twitter beğeni twitter retweet youtube izlenme youtube abone instagram

Ember.js template binding performance

Asked By: Anonymous

We have a page containing a table with 26 rows. Each row will contain either an <input> or <select> element, depending on the data we’re binding to. When binding to elements that contain between 5-30 options, it takes a page about 5 seconds to render. If I remove the binding, the page renders in under a second.

Is there a known performance issue when binding to Ember.Select views? Or, could I be doing it incorrectly? I’m using Firefox 22. IE9 is about twice as slow. The CPU is not pegged during this time. I’m using ember 1.0rc6.

Template snippet:

{{#if pa.isPickList}}
    {{view Ember.Select viewName="select" contentBinding="pa.options" selectionBinding="pa.selected"}}
    {{input valueBinding="pa.selected"}}

I worry that the async nature of how I’m fetching the model could be causing inefficiencies. Perhaps the binding and async events are interacting inefficiently. is the backend. From what little I know about promises, I’m wondering if I need to fetch the server data in a promise. I’m not sure how to do this.

Here’s how I’m currently fetching the data in my Route:

App.IndexRoute = Ember.Route.extend({
    model: function(params){
        var otherController = this.controllerFor('selectedProducts');

        var ar = Ember.A(); //create an array
        var arg = '0067000000PNWrV';

            function myHandler(result, event) { 
  'got results!!! ' + result.length); 
            for(var i = 0; i < result.length; i++)
                var p = result[i];
                var sfProd = App.ProductResult.create({content: p});
            {escape: false} //some of the names have ampersands!!

        return ar;

Thanks in advance for helping a newbie learn the ways of javascript and Ember.

Here is working example of this issue. I have 5 picklists each with 60 options. This take 2-3 seconds to render on my machine. I realize these are decently large numbers but hopefully not unreasonable. Increase the number of picklist elements or options and you can easily hit 5 seconds.

Also, moving my server-model-fetching to a promise did not affect performance.



Answered By: Anonymous

It’s a little hard to guess at performance problems like this without looking at it in a profiler. You can try creating a profile in Chrome dev tools to see what method is taking the most amount of time. Or create a jsbin which has the same issue.

One potential issue is that the array that you bind to is being built at the same time when the bindings are connected. This shouldn’t be an issue with rc.6. What version of Ember are you on?

Regards to promises, your model hook should return a promise that wraps your async call, like so.

model: function(params) {
  var promise = Ember.Deferred.create();
  var myHandler = function(result, event) {
    var model = Ember.A();

    // populate the model


  var arg = '0067000000PNWrV';
  Visualforce.remoting.Manager.invokeAction(..., myHandler);

  return promise;

If the bindings were firing too early/often, loading the model in a promise like this would help.

Finally try setting Ember.STRUCTURED_PROFILE to true. This will show you exactly how long the templates are taking to render.

Edit: After the the jsfiddle

I dug into this a little more. This is a known issue with Ember.Select. The default implementation creates SelectOption views for each option inside the select to allow databinding of the option items itself. Creating those many views is what takes the time.

However the typical usage will rarely need binding to the option items only to the whole list itself. And this appears to be the common way to bridge the performance gap.

I found a gist that uses option tags instead of SelectOption views.

Here’s your updated jsfiddle. I upped the lists to 10 with 100 items each. The list renders in about 150ms for me now.

techinplanet staff

instagram volgers kopen volgers kopen buy windows 10 pro buy windows 11 pro

Windows 10 Kaufen Windows 10 Pro Office 2019 Kaufen Office 365 Lizenz Windows 10 Home Lizenz Office 2019 Home Business Kaufen windows office 365 satın al follower kaufen instagram follower kaufen porno
Alanya escort Manavgat escort Fethiye escort Kemer escort Didim escort Çanakkale escort Aydın escort Muğla escort Tekirdağ escort Manisa escort Balıkesir escort Trabzon escort Elazığ escort Ordu escort Kütahya escort Isparta escort Rize escort Kahramanmaraş escort Yalova escort Giresun escort Yozgat escort Tokat escort Şanlıurfa escort Sivas escort Batman escort Erzurum escort Sinop escort Kırşehir escort Karaman escort Kırıkkale escort Bolu escort Amasya escort Niğde escort Uşak escort Edirne escort Çorum escort Osmaniye escort Zonguldak escort Van escort Erzincan escort Söke escort Bodrum escort Çerkezköy escort Akhisar escort Bandırma escort Ayvacık escort Akçaabat escort Karakoçan escort Altınordu escort Tavşanlı escort Eğirdir escort Ardeşen escort Afşin escort Altınova escort Bulancak escort Sorgun escort Erbaa escort Viranşehir escort Zara escort Kozluk escort Aziziye escort Ayancık escort Kaman escort Ermenek escort Keskin escort Gerede escort Göynücek escort Bor escort Banaz escort Havsa escort Osmancık escort Bahçe escort Alaplı escort Başkale escort Kemah escort Nazilli escort Fethiye escort Çorlu escort Alaşehir escort Altıeylül escort Biga escort Araklı escort Kovancılar escort Fatsa escort Simav escort Yalvaç escort Çayeli escort Dulkadiroğlu escort Çiftlikköy escort Espiye escort Sarıkaya escort Niksar escort Suruç escort Yıldızeli escort Sason escort Horasan escort Boyabat escort Mucur escort Sarıveliler escort Yahşihan escort Göynük escort Gümüşhacıköy escort Çamardı escort Eşme escort İpsala escort Sungurlu escort Hasanbeyli escort Çaycuma escort İpekyolu escort Refahiye escort Kuşadası escort Marmaris escort Süleymanpaşa escort Turgutlu escort Susurluk escort Gelibolu escort Of escort Ünye escort Domaniç escort Fındıklı escort Elbistan escort Çınarcık escort Tirebolu escort Akdağmadeni escort Turhal escort Eyyübiye escort Suşehri escort Yakutiye escort Gerze escort Mengen escort Merzifon escort Ulukışla escort Sivaslı escort Keşan escort Kadirli escort Ereğli escort Özalp escort Tercan escort Efeler escort Didim escort Çine escort Dalaman escort Menteşe escort Milas escort Ortaca escort Seydikemer escort Ergene escort Kapaklı escort Malkara escort Salihli escort Şehzadeler escort Soma escort Yunusemre escort Ayvalık escort Bigadiç escort Burhaniye escort Gönen escort Karesi escort Çan escort Yenice escort Ortahisar escort Yomra escort Perşembe escort Pazar escort Onikişubat escort Pazarcık escort Türkoğlu escort Eynesil escort Görele escort Piraziz escort Yağlıdere escort Çayıralan escort Boğazlıyan escort Zile escort Siverek escort Karaköprü escort Haliliye escort Akçakale escort Şarkışla escort Gemerek escort Oltu escort Palandöken escort Mudurnu escort Suluova escort Taşova escort Toprakkale escort Kilimli escort Tuşba escort Üzümlü escort