How do I call a JavaScript function from an html.erb

Question

How do I call a JavaScript function from html.erb

in application.js

function displayClock() {
  var digital = new Date();
  var hour         


        

Answer 1

You probably need to use proper tag to indicate that you're writing JS code:

<script type="text/javascript">
  displayClock();
</script>

Plus, since you probably use jQuery (it's default in Rails), you may want to make sure the function is called after whole document is loaded:

<script type="text/javascript">
  $(document).load(function(){
    displayClock();
  });
</script>

I'd also advice you not to write your JS in application.js and use this file only as a manifest file, which includes your other scripts through Rails asset pipeline.

Also you can take advantage of the javascript helper javascript_tag in your html.erb file

<%= javascript_tag "displayClock()" %>