How can I change the color of a changed cell in Handsontable?

Question

I am using the Handsontable plugin and when the user changes the values in the cell, it should turn yellow so they can keep track of what has been changed. In this case, yellow

Answer 1

to mark every cell that have change you can create a custom renderer and apply only if data("change") exists like this

//Custom renderer add class if the element have the data "change"
var myRenderer = function (instance, td, row, col, prop, value, cellProperties) {
  Handsontable.TextCell.renderer.apply(this, arguments);
  if($(td).data("change")){
      $(td).addClass('changeInput');
  }
};     
$('#example').handsontable({
data: data,
minSpareRows: 1,
colHeaders: true,
contextMenu: true,
  cells: function (row, col, prop) {//set the new renderer for every cell
    return {type: {renderer: myRenderer}};
  }
});
//afterChange get every cell and add class and data
$('#example').handsontable('getInstance').addHook('afterChange', function(changes) {
  var ele=this;
  $.each(changes, function (index, element) {
            $(ele.getCell(element[0],element[1])).addClass('changeInput').data("change",true);
});

$("#example").on("keyup","textarea.handsontableInput",function (){
$(this).addClass('changeInput');
}).on("blur","textarea.handsontableInput",function (){
$(this).removeClass('changeInput');
});       

http://jsfiddle.net/PAH5J/8/
EDIT
to move the highlighted area you can use the cellProperties instead of .data() like this

var myRenderer = function (instance, td, row, col, prop, value, cellProperties) {
     Handsontable.TextCell.renderer.apply(this, arguments);
     if (cellProperties.change) {//check for new property change in the cell
         $(td).addClass('changeInput'); //add the changeInput class to the actual td
     }
};    
$('#example1').handsontable('getInstance').addHook('afterChange', function(changes) {
    var ele=this;
    $.each(changes, function (index, element) {
         //add the changeInput class to the actual td
         $(ele.getCell(element[0],ele.propToCol(element[1]))).addClass('changeInput')
         //get the cell properties and create a new one "change"     
         //to check in the renderer
         ele.getCellMeta(element[0],ele.propToCol(element[1])).change=true;
    });    
});