Grails javascript render from controller to gsp

Question

I am trying to render some Javascript from my controller to my GSP like this:

render text: """<script type="text/javascript">
                                            alert("Row number: " + rowNumber); 
                                        </script>""",
                               contentType: 'js'

where "rowNumber" is a variable in my Controller and I want the value of it to appear in the alert box. I can't seem to figure out the syntax and need a little help. Presently I get this error in the browser:

Uncaught ReferenceError: rowNumber is not defined

Jeff Scott Brown · Accepted Answer · 2014-06-21 21:28:33Z

1

You want something like this:

render text: """<script type="text/javascript">
                    alert("Row number: " + ${rowNumber}); 
                </script>""",
       contentType: 'js'

That will cause the value of rowNumber in your controller to be substituted into the string before the string is rendered.

EDIT:

(another option)

You could do away with the concatenation altogether with something like this:

render text: """<script type="text/javascript">
                    alert("Row number: ${rowNumber}"); 
                </script>""",
       contentType: 'js'

answered Jun 21, 2014 at 21:28

Jeff Scott Brown

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3 Comments

Jeff Scott Brown Over a year ago

The way you had it, the literal alert("Row number: " + rowNumber); is what would be rendered instead of something like alert("Row number: " + 42);.

Jeff Scott Brown Over a year ago

All of that assumes there is a variable named rowNumber in scope where you are calling render in your controller there.

Charles Wood Over a year ago

Note that you could also put the JavaScript into a template and render that from the controller rather than having to triple-quote it inline. Then you would pass rowNumber into the template, e.g., render template: 'rowNumberJS', model: [rowNumber: rowNumber]

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