how to trigger a function automatically in ember.js action helper?

I am new to ember.js and working on an application to highlight text like below:

<div>
  <h3 class = "title" ></h3>
  <div class = "date" ></div>
  <p class = "content" >
  </p>
</div>

I created a function highlight which will get the class name and highlight the search text the user input. This function works fine, but I have to click to trigger this highlight function. Is there any way in ember action helper can trigger this function whenever the div node rendered or automatically triggered?