从控制器到gsp的Grails JavaScript渲染

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 

Answer 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'