Grails using grails var in GSP Site inside javascript

Question

I have a question using grails variable values in javascript code in a GSP file.

For Example: I have a session value session.getAttribute("selectedValue") and I want to use this value inside javascript code part.

My solution is now (inside a GSP):

<%
    def js = new String("<script type=\"text/javascript\">")
    js += "var jsSelectedValue = " + session.getAttribute("selectedValue") + ";"
    js += "</script>"
    out << js
%>

and then I have javascript block inside my GSP with jQuery Stuff and so on, there I need this value.

Is there another way to have grails variables accessible inside pure javascript code?

And second question, the exactly other way around. I select for example in a dropdown box and click "save" and then i want to store the value $("#select-box").val() inside a session variable from JS-part.

Thank you very much in advance for your help.

Cheers,

Marco

You're not really referencing any grails variables in the code above. What you're actually doing is using generating javascript code from a template. This template can access the session because it is processed on the server side. — Dónal
– Dónal, Commented Aug 9, 2011 at 14:45

Alexander Suraphel · Accepted Answer · 2016-05-23 16:51:40Z

12

Why do not use the javascript GSP-tag? A solution can look like this:

<g:javascript>
    var jsSelectedValue = "${session.selectedValue}"; 
</g:javascript>

edited May 23, 2016 at 16:51

Alexander Suraphel

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answered Aug 9, 2011 at 13:15

Medrod

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1 Comment

RasTheDestroyer Over a year ago

Not sure if anyone else will get stuck in the same way I did, but make sure that the var declaration is in a separate tag than any script with a source parameter.

mj.scintilla · Accepted Answer · 2011-08-09 13:33:26Z

1

The solution to your first problem might be as follows:

UPDATE: Modifications according to @Medrod's solution:

<script type="text/javascript">
var jsSelectedValue = "${session.selectedValue}";
</script>

And for second question:
Send selected value to server and set session variable.

edited Aug 9, 2011 at 13:33

answered Aug 9, 2011 at 12:52

mj.scintilla

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1 Comment

grailsInvas0r Over a year ago

Thanks Medrod and Zedwal! For the answer of the second question, if I send everything to the server (e.g. JSON POST) every script kiddie can prepare some local form values and prepared ajax post and manipulte... right?!

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