Passing javascript var value to grails variable

Question

How can I pass a javascript value to grails variables. For example:

   var ert = 1;
   function test(){
   ert++;
   }

that function will be called if a button is click, does incrementing the variable. Now I want to pass this value to a grails variables or groovy variables that is being returned to the page. How can I do this?

How do you want to use this variable? what do you mean with 'returned to the page'? — Igor Artamonov
– Igor Artamonov, Commented Oct 26, 2012 at 1:31
I have an action such as def mypage(){ def inc = 0; [inc:inc]}. I want to copy the javascript value to the inc variable to which the mypage contains the function test() — user1577161
– user1577161, Commented Oct 26, 2012 at 1:34

Gregg · Accepted Answer · 2012-10-26 03:28:44Z

1

Add a hidden field to your form and when the button is clicked, modify that hidden element's value to be what you want sent to the server.

<button onclick="testFunction()">Click me</button>
<input type="hidden" name="inc" id="inc" value="1" />
<div id="testOutput">1</div>

var ert = 1;
function testFunction() {
    var inc = document.getElementById("inc");
    ert++;
    inc.value = ert;

    //for demo only
    var testOutput = document.getElementById("testOutput");
    testOutput.innerHTML = inc.value;
}

jsFiddle example

edited Oct 26, 2012 at 3:28

answered Oct 26, 2012 at 1:53

Gregg

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1 Comment

user1577161 Over a year ago

what do you mean? can you please give atleast sample code for it? thanks.

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