javascript - Why is Template.mytemplate.rendered getting triggered twice when trying to animate live changes in Meteor.js? -

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i have issues figuring out how meteor.rendered works exactly. i'm trying animate live change in meteor, this question does. whenever click on element, want blink.

however, template gets rendered twice every time element clicked, in turn triggers animation 2 times. here code:

template

<body>   {{> myitemlist}} </body>  <template name="myitem">   <div class="item {{selected}}">     <h4>{{name}}</h4>     <p>{{description}}</p>   </div> </template>  <template name="myitemlist">   {{#each items}}     {{> myitem}}   {{/each}} </template>

javascript

template.myitemlist.helpers({   items: function () {     return items.find();   } });  template.myitem.helpers({   selected: function () {     return session.equals('selected', this._id) ? "selected" : "";   } });  template.myitem.events({   'click .item' : function () {     session.set('selected', this._id);   } });  template.myitem.rendered = function () {   $(".item.selected").fadeout().fadein(); };

my understanding every time session.set called, every template uses session.get same key re-runed, explained in documentation. guess somehow, session.equals causes 2 reruns of template, maybe? if change selected helper code:

template.myitem.helpers({   selected: function () {     if (session.get("selected")) === this._id)       return "selected";     else       return "";   } });

then animation gets triggered 3 times instead of 2.

with in mind, questions are:

  1. why template.myitem.rendered getting triggered twice? goes on behind scenes?
  2. how can fix have animation triggered once?

answer details

so comment on @xyand solutions:

  1. moving animations click event meteor.settimeout() works, felt bit hacky me.

  2. the solution quite simple, , given in this question. code looks this:

    template.myitem.rendered = function () {   if (session.equals('selected', this.data._id))     $(this.firstnode).fadeout().fadein(); };

i first tried on different project had different template markup , didn't work, why created minimal project see things went wrong. turns out work, absolutely need have sub-template myitem called inside myitemlist template. if template looks this,

<template name="myitemlist">   {{#each items}}     <div class="item {{selected}}">       <h4>{{name}}</h4>       <p>{{description}}</p>     </div>   {{/each}} </template>

and every helper function , rendered function called myitemlist template, code won't work because inside rendered function, template instance have .data attribute undefined.

the template gets rendered twice because 2 different instances of same template rendered. 1 changes selected "selected" , changes "". explains why have 3 renders when switch equals get.

mixing imperative javascript declarative mess. here 2 suggestions:

  1. add if inside rendered function make sure call transition in selected item template instance.

  2. move transition event itself. might need use meteor.settimeout.

placing transition in rendered might not best option happen every time template renders. instance if name changes. think happen when code gets longer...


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