How do you pass a JavaScript variable to your Groovy controller?

Question

I have been searching on Google for a really good while, and I cannot find a solution to this problem. I am trying to access a JavaScript variable from my GSP file in my Groovy controller, but I can't find out how to do this.

Example:

//JavaScript stuff
<script>
    function validateForm(){
         var ret = false
    }
</script>

//Groovy controller stuff
def myAction = {
    println params.ret
}

How do I achieve something similar to this?

I have tried remoteFunction but I get a java script error so it might work but I dont know the syntax of it. This is how I have it in my javascript ${remoteFunction(controller: ActionsController, action:'ImplementNewPixel', params: 'ret')} But no I have not tried anything with sessions yet. How would you use sessions? — Eli Davila
– Eli Davila, Commented Aug 7, 2013 at 1:56
You should be able to pass the variable using remoteFunction. Have a look at the way params are passed in remoteFunction. — dmahapatro
– dmahapatro, Commented Aug 7, 2013 at 2:45

Peter Mortensen · Accepted Answer · 2014-02-01 16:09:46Z

2

Two ways to pass a variable to the controller:

Ajax
Form submit

Ajax

Use remoteFunction

${remoteFunction(controller: 'actionsController' , action: 'implementNewPixel', params: '\'ret=\' + ret')}

Use Ajax

var ret = false;
jQuery.ajax({
    url: "${createLink(controller: 'actionsController', action: 'implementNewPixel')}",
    data: "ret=" + ret,
    success: function (data) {
        alert(data);
    }
});

etc.

Form submit

<script src="//ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<script>
    var ret;
    function validateForm(){
        ret = false;
    }

    jQuery(function () {
        jQuery("[name='jftForm']").submit(function () {
            jQuery("[name='ret']").val(ret);
        });
    });
</script>

<g:form name="jftForm" controller="actionsController" action="implementNewPixel">
    ...
    <g:hiddenField name="ret" value=""/>
    <g:submitButton name="submit" value="Submit"/>
</g:form>

edited Feb 1, 2014 at 16:09

Peter Mortensen

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answered Aug 7, 2013 at 6:19

MKB

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2 Comments

Eli Davila Over a year ago

I have tried both of your methods but I still cannot access the variable in my controller. Would I be able to access it by using params.ret in my controller? Also when I try using the Form submit method, I get a java script error like so Uncaught ReferenceError: $ is not defined ImplementNewPixel:133 (anonymous function)

MKB Over a year ago

Include jQuery in your page.

James Kleeh · Accepted Answer · 2013-08-07 04:33:15Z

0

Look at the documentaton.

params: '\'ret=\' + ret'

answered Aug 7, 2013 at 4:33

James Kleeh

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