How to use instance variables in rails ujs?

Question

This is what i used to do in html.erb earlier:

my markup
<script type="text/javascript">
    var somevalueFromInstance = "<%= @value_from_instance %>";
    // code directly using the someValueFromInstance
</script>
markup continues..

mostly i will place the script tag in a content_for block.

Now when i want to do this unobtrusive, i cannot have any script tags in the html.erb. The script lies in a javascript file. But how do i transport the @value_from_instance to the javascript file?

Is storing it in a data-attribute the only option to do this?

Also i want to do this on page load and not in an ajax request for this purpose

shingara · Accepted Answer · 2012-02-22 11:02:47Z

1

The data-* attribute is do to that. It's the must simplest way to define your args or you can create some variable in a script tag in your HTML directly.

answered Feb 22, 2012 at 11:02

shingara

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5 Comments

shingara Over a year ago

no limit in theory. You can put your array in content of script tag instead. Like do by javascript templating by example.

ZX12R Over a year ago

sorry.. i do not understand. can u please elaborate?

shingara Over a year ago

add your variable directly in your HTML and only variable. Without function.

shingara Over a year ago

yes and no. Yes because there are no code not reuse and No because there are some code. You can't be complete unobstrusive

ZX12R Over a year ago

well.. not convincing enough for my finicky client, who has a problem with script in markup :(

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