backbone.js - Make backbone wait to render view -


i'm new backbone , have collection of objects , view displays them list. set every time object added collection view re-rendered. inefficient because if add 20 things collection @ once, rendered 20 times when needs rendered 1 time after last item has been added. how make backbone hold off on rendering until i'm done adding things collection?

here code:

<html>     <head>         <meta charset="utf-8" />         <title>looking @ underscore.js templates</title>     </head>     <body>         <script type="text/template" class="template">             <ul id="petlist">                 <% _.each(model.pets, function(pet) { %>                     <li><%- pet.name %> (<%- pet.type %>)</li>                 <% }); %>             </ul>         </script>          <div id="container"/>          <script type="text/javascript" src="http://code.jquery.com/jquery-1.9.1.js"></script>         <script type="text/javascript" src="http://underscorejs.org/underscore.js"></script>         <script src="http://backbonejs.org/backbone-min.js"></script>         <script type="text/javascript">              var servicedata = [                 {                     name: "peaches",                     type: "dog"                 },                  {                     name: "wellington",                     type: "cat"                 },                  {                     name: "beefy",                     type: "dog"                 }             ];              $(document).ready(function() {                 var pet = backbone.model.extend({                      name: null,                     type: null                 });                  var pets = backbone.collection.extend();                  var appview = backbone.view.extend({                     updateui: function(model) {                         _.templatesettings.variable = "model";                         var template = _.template($("script.template").html());                         var model = { pets: model.collection.tojson() };                         var html = template(model);                         $("#container").html(html);                     }                 });                  var pets = new pets();                 var av = new appview();                 pets.bind("add", av.updateui);                 pets.set(servicedata);             });          </script>     </body> </html>

you need re-factor couple of things on code. specific case need use reset instead of set, dispatch 1 event when data set. pass collection view , view listen reset event.

additionally, prevent stress of browser use document.createdocumentfragment dom holder speed treatment of append. check point number 2 more reference: http://ozkatz.github.io/avoiding-common-backbonejs-pitfalls.html

<html>     <head>         <meta charset="utf-8" />         <title>looking @ underscore.js templates</title>     </head>     <body>         <script type="text/template" class="template">             <ul id="petlist">                 <% _.each(model.pets, function(pet) { %>                     <li><%- pet.name %> (<%- pet.type %>)</li>                 <% }); %>             </ul>         </script>          <div id="container"/>          <script type="text/javascript" src="http://code.jquery.com/jquery-1.9.1.js"></script>         <script type="text/javascript" src="http://underscorejs.org/underscore.js"></script>         <script src="http://backbonejs.org/backbone-min.js"></script>         <script type="text/javascript">              var servicedata = [                 {                     name: "peaches",                     type: "dog"                 },                  {                     name: "wellington",                     type: "cat"                 },                  {                     name: "beefy",                     type: "dog"                 }             ];              $(document).ready(function() {                 var pet = backbone.model.extend({                      name: null,                     type: null                 });                  var pets = backbone.collection.extend();                  var appview = backbone.view.extend({                     initialize : function(){                         this.collection.bind("reset", av.updateui);                     },                     updateui: function() {                         $items = document.createdocumentfragment();                         this.collection.each(function(model){                             var itemview = new itemview({model : model});                             $items.append(itemview.el);                             itemview.render();                         });                         $("#container").html($items);                     }                 });                  var pets = new pets();                 var av = new appview({collection : pets});                 pets.reset(servicedata);             });          </script>     </body> </html>

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