Form combo item as filter for grid

Hello,i have a form with 3 combo items and a container with an attached grid…someone advice on how i can use the combo items as filters for what the grid loads individually, and only one filter can be used at a time.please reply t is urgent

Please, try call filterBy() method from the onChange event of the combo.
For example:

var combo = form.getCombo(comboName); combo.attachEvent("onChange",function(){ var value = this.getActualValue(); mygrid.filterBy(colInd,value) })