rails not registering javascript files under app/assets/javascripts

Question

I'm currently trying to integrate d3 with my rails app. After installing the d3-rails gem, I came across this tutorial on d3. Somewhere in the tutorial, the below code is provided

<meta charset="utf-8">
<style>

.chart div {
  font: 10px sans-serif;
  background-color: steelblue;
  text-align: right;
  padding: 3px;
  margin: 1px;
  color: white;
}

</style>
<div class="chart"></div>
<script>

var data = [4, 8, 15, 16, 23, 42];

var x = d3.scale.linear()
    .domain([0, d3.max(data)])
    .range([0, 420]);

d3.select(".chart")
  .selectAll("div")
    .data(data)
  .enter().append("div")
    .style("width", function(d) { return x(d) + "px"; })
    .text(function(d) { return d; });

</script>

If I were to include the above code as it is into my new.html.erb file, the chart will show.

I then created a new graph.js fiel under app/assets/javascripts and decided to put everything between the <script> </script> tag inside graph.js. Now when I open up new.html.erb, the chart will not show anymore.

Am I doing something wrong here that's causing rails to not recognize graph.js ?

I think you should do two things: open the source code of the page, look into /scripts/application.js and examine if d3 code has been included. Second thing is to open the developer console of the browser and examine for potential exceptions with JavaScript code. — Mareq
– Mareq, Commented Nov 22, 2015 at 22:28

user5592510 · Accepted Answer · 2015-11-22 20:26:31Z

1

Did you compile the assets?

You'll need to run:

rake asset:precompile

answered Nov 22, 2015 at 20:26

user5592510

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2 Comments

user3277633 Over a year ago

rails is giving a Don't know how to build task 'asset:precompile' error. Not exactly sure what it means

user3277633 Over a year ago

I think it's suppose to be rake assets:precompile , but I tried that and it still does not resolve my problem.

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