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>

Comments

Post a Comment

Popular posts from this blog

javascript - jQuery: Add class depending on URL in the best way -

i have html progress meter: <div class="col-md-3" style="margin-left: -20px;"> <div class="progress-pos active" id="progess-1"> <div class="progress-pos-inner"> login </div> </div> </div> <div class="col-md-3 progress-pos-container"> <div class="progress-pos" id="progess-2"> <div class="progress-pos-inner"> scan items </div> </div> </div> <div class="col-md-3 progress-pos-container"> <div class="progress-pos" id="progess-3"> <div class="progress-pos-inner"> confirm address </div> </div> </div> <div class="col-md-3 progress-pos-container"> <div class="progress-pos" id="progess-4"> <div class="progress-pos-in...
Read more

caching - How to check if a url path exists in the service worker cache -

i need check if particular url path exists in service worker cache. example, suppose url is: /myserviceworker/service?a=110&b=70 this url exists in cache, there many of them different values of , b. now, suppose want refresh of these urls, how can that? i want know how access key values service worker cache. if know key, plan follows: var url = new url(key); if(url.pathname === "\/myserviceworker/service") refetch key but not sure how cache key , in format is. mean, string or url? cache api has match() method returns promise resolving in response object if match or undefined if no match exists. second parameter object can specify ignoresearch not take account url parameters. the ignoresearch option supported firefox ( chrome status here ). in other hand, retrieve cache entries, can use keys() method.
Read more

Redirect to a HTTPS version using .htaccess -

i need modify .htaccess file redirect urls https version without "www". http://example.com --> https://example.com http://www.example.com --> https://example.com https://www.example.com --> https://example.com this how .htaccess file looks like: rewriteengine on rewritecond %{request_filename} !-d rewritecond %{request_filename} !-f rewriterule ^(.*)$ redirect.php?id=$1&page=$2 [qsa,l] what modifications need make .htaccess in order forward https without "www"? it depends on doing current code. looks file called redirect trying display php page seo friendly url. think might confusing people. anyway, need , force https without www, need 1 more rule above. also second rule needs two capture groups in rewriterule test string because wanting 2 different values using $1 , $2 references. rewriteengine on #rediect www non www and/or http https --- combinations. rewritecond %{http_host} !^example\.com [nc,or] rewritecond %{https} !^...
Read more