Grails - set variable from javascript function

Question

When I tried to set a variable from javascript function in GSP view I had error: "Cannot invoke method func() on null object"

GSP:

<g:set var="variable" value="${tr.func.name()}" />

I also tried to the get around the problem without success: variable is undifined

<g:javascript>var test = tr.func.name();</g:javascript>
<g:set var="variable" value="${test}" />
<g:javascript>alert(${variable});</g:javascript>

Thanks

it's impossible. javascript works in browser, on client computer, not server, when view is already processed and transferred to browser. what you really trying to reach? — Igor Artamonov
– Igor Artamonov, Commented Feb 6, 2014 at 13:41
I have a jquery function that get timzone from the user, I want to use it for: <g:formatDate format="yyyy-MM-dd HH:mm" date="${date}" timeZone="GMT"/> — Jils
– Jils, Commented Feb 6, 2014 at 13:49
it's too late at this moment, gsp works on server. you cannot use gsp tags in browser. so, you have to use javascript for date formatting. — Igor Artamonov
– Igor Artamonov, Commented Feb 6, 2014 at 13:52

Igor Artamonov · Accepted Answer · 2014-02-06 13:55:06Z

2

You should use Javascript in browser. GSP works on server side.

Just pass date in GMT to browser, and apply formatting there. There is a good js library for Date formatting: moment.js

answered Feb 6, 2014 at 13:55

Igor Artamonov

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Joshua Moore · Accepted Answer · 2014-02-06 13:26:56Z

1

You can't do that. <g:set> is used to set server-side variables within the GSP. Javascript is client-side.

answered Feb 6, 2014 at 13:26

Joshua Moore

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2 Comments

Jils Over a year ago

Is there another solution provided by Grails?

spikeheap Over a year ago

There's no solution full-stop. The GSP tags are rendered prior to being sent to the client. When the JavaScript is executed it is in the client. The distinction between client and server side is an important one. The solution you are looking for is to use JavaScript date formatting.

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