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    [% # contains app_url so needs to be .tt not linked js file %]
<!-- BEGIN site/js/form2queryparam.tt -->
    <script type="text/javascript">
        function form_to_queryparam (form_id, fields, additionals) {
            var form  = document.getElementById(form_id);
            var param = [];    

            for (var add_name in additionals) {
                param.push(add_name + '=' + encodeURIComponent(additionals[ add_name ]));
            }

            for (var field_idx in fields) {
                var elem = form[ fields[ field_idx ] ];
                var value;    
                // encode text inputs
                if (elem.type == 'text') {
                    value = elem.value;
                }
                // encode checkboxes
                else if (elem.type == 'checkbox') {
                    if (elem.checked) {
                        value = elem.value;
                    }
                    else {
                        value = '';
                    }
                }
                // encode select boxes
                else if (elem.options) {
                    for (var option_idx in elem.options) {
                        var opt = elem.options[ option_idx ];     
                        if (!opt.selected)
                        continue;
                        param.push(elem.name + '=' + encodeURIComponent(opt.value));
                    }
                    continue;
                }
                param.push(elem.name + '=' + encodeURIComponent(value));                
            }    
            return param.join('&');
        }
    
        function get_chart (constraint_type, fields) {
            document.getElementById('chart').src 
                = '[% app_url %]/chart/process/[% resource_target %]' 
                + '?'
                + form_to_queryparam('constraint_form', fields,
                    { constraint_type: constraint_type });
        }
    </script>
<!-- END site/js/form2queryparam.tt -->