rails javascript helper - capturing an additional level of block nesting within a content_for
When making a helper that takes a block, the yield causes it to output at the point of being called in the template. If the reason for the helper is to populate a content_for/yield variable, such as to put javascript in the head tag, you get duplicate output: once where it belongs when the content_for is yielded, and once where you call your helper. Instead, make use of capture(&block).
This helper
def javascript(&block)
content_for(:header) do
"<script type=\"text/javascript\">//<![CDATA[#{capture(&block)}//]]></script>"
end
end
<%javascript do%>
alert('hi')
<%end%>
<html>
<head>
<script type=\"text/javascript\">//<![CDATA[
alert('hi')
//]]></script>
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