Meteor's Session.set causing duplicate the Bootstrap modal? -

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i using meteor 0.6.2.1.

i have encountered strange issue bootstrap modal when call meteor's session.set().

i want show simple modal dialogue , update data when user clicks on template instance.

i copy bootstrap modal example .html file:

    <body>         {{> hello}}         {{> alert}}     </body>      <template name="hello">         <h1>hello world!</h1>         {{greeting}}         <input type="button" value="click" />         <br/>          <!-- button trigger modal -->         <a href="#mymodal" role="button" class="btn" data-toggle="modal">launch demo modal</a>     </template>      <template name="alert">         <!-- modal -->         <div id="mymodal" class="modal hide fade" tabindex="-1" role="dialog" aria-labelledby="mymodallabel" aria-hidden="true">             <div class="modal-header">                 <button type="button" class="close" data-dismiss="modal" aria-hidden="true">×</button>                 <h3 id="mymodallabel">modal header</h3>             </div>             <div class="modal-body">                 <p>one fine body…</p>                 <p>data = {{data}}</p>             </div>             <div class="modal-footer">                 <button class="btn" data-dismiss="modal" aria-hidden="true">close</button>                 <button class="btn btn-primary">save changes</button>             </div>         </div>     </template>

and set data when button click:

if (meteor.isclient) {   session.set("data", "abcd");   template.hello.greeting = function() {     return "welcome use-bootstrap.";   };   template.alert.data = function() {     return session.get("data");   };   template.hello.events({     'click input': function() {       if (typeof console !== "undefined" && console !== null) {         return console.log("you pressed button");       }     }   });   template.hello.events({     'click .btn': function() {       var randomid;       randomid = random.id();       console.log("data = " + session.get("data"));        // cause duplicate template.alert       session.set("data", randomid);     }   }); }  if (meteor.isserver) {   meteor.startup(function() {     return console.log("server start!!");   }); }

i use chrome debug , see modal element duplicate when click button.

what's matter code?

i'm not 100% sure why happening believe has references modal node kept in js code (bootstrap).

to solve added:

template.alert.preserve(["#mymodal"]);

from meteor docs:

preservation useful in variety of cases replacing dom element identical or modified element not have same effect retaining original element. these include:

  • input text fields , other form controls
  • elements css animations
  • iframes
  • nodes references kept in javascript code

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