Rails Against The Machine

window.onload = init;

function init(){
        //
        if (field = $('parent_dropdown_id')) {       
            field.observe('change', function(e) {
                //make a request and get the json output
                new Ajax.Request('url_to_get_data_from', {
                    method:'get',
                    parameters: field.serialize(true),
                    onSuccess: function(transport){
                        var json = transport.responseText.evalJSON();
                        some_namespace.display(json);
                    }
                });      
            });
        }
    }
    
    var some_namespace= {
        display: function (data){
            var field = $('child_dropdown_id');
            opt= field.options;
            opt.length=0; //You delete by resizing the array
            for(var i=0;i<data.length;i++){
                opt[opt.length] = new Option(data[i][0],data[i][1]);
            }
        }
    }
    
    

posted by ~J  # 06:37