Set Value of form input from variable in Jquery

I have a variable named colWidth in jquery which runs some math on numbers grabbed from an input using jquery. How do I set a value of an input field with an id of #test to the value of colWidth?

$("input#width").keyup(function () {
  var value = $(this).val();
  $("span#width-text").text(value);
}).key开发者_运维知识库up();

$("input#columns").keyup(function () {
  var value = $(this).val();
  $("span#columns-text").text(value);
}).keyup();

$("input#gutter").keyup(function () {
  var value = $(this).val();
  $("span#gutter-text").text(value);
}).keyup();

$("input#gutter").keyup(function () {
  var value = $(this).val();
  $("span#gutter-text").text(value);
}).keyup();

$(function(){
    $('a#calc').click(function(){
        var width = $('input#width').val();
        var col = $('input#columns').val();
        var gutter = $('input#gutter').val();
        var newWidth = width / col;
        var colSize = (gutter + gutter) * col;
        var colWidth = newWidth - colSize;
        $('input#test').val(colWidth);
    });
 });

$("#test").val(colWidth)

Louis,

You're getting NaN because your calculation is running before the user has a chance to enter any numbers into the <input> elements.

In your question, you use a .click() handler to fire the calculation, but on your page, you don't. It just runs when the page loads.

Therefore the result of .parseInt() is NaN, and the result of the calculations are the same.