问jQuery in Template.rendered会被调用，但不会生效

EN

<template name="sampleTemplate">
<ul>
  {{#each listOfTextFields}}
   < li > < textarea id="{{_id}}" > </li>
  {{/each}}
</ul>
</template>

Template.sampleTemplate.listOfTextFields = function () {
   return applicationDB.find({ //some fields })
}

Template.sampleTemplate.events({
   'keydown enter' : function (enterEv) {
        //add new document to collection
        Session.set("newTextAreaCreated", 1);
        Session.set("newItemId", newItemId);

    }
}

Template.sampleTemplate.rendered = function () {
    if (Session.get("newTextAreaCreated") == 1){
        console.log("new text area is created")
        $(document.getElementById(Session.get("newItemId")).focus();
    }
Session.set("newTextAreaCreated", 0);
}