Let's say I have this HTML:

<select id='list'>

    <option value='1'>First</option>

    <option value='2'>Second</option>

    <option value='3'>Third </option>

</select> 

<input type =text id=text/>

and then this JavaScript

 //other variables are also declared here

    var x1 = 5;

    var x2 = 10;

    var value = x1 * x2;

    var list_value =$(#list).change(function() {

             $(this).val();

 // just an example of how i want the function in the variable 

    });

    var nwval = value * list_value;

      $('#text').val(nwval);

// some long piece of code 

// i'm also using the list_value value somewhere in the long piece of code..

I want the val in the textbox to change as the user selects an option, I know it'll work if I wrap the change event around it, but is there any way to go about this while keeping it as that variable list_value?