/*

 *  general functions

 */

//return the index of elem in vect, or -1 if not found (use binary search)

//input: vect -> an array

//       elem -> element to search in the array

function SG_getIndex(vect, elem) {

    i = 0;

    j = vect.length -1;

    while (i<j) {

        if (vect[i] == elem) return i;

	if (vect[j] == elem) return j;

	i++;

        j++;

    }

    return -1;

}



/*

 *  additional string methods

 */

//trim method for strings

// create the prototype on the String object

String.prototype.SG_trim = function() {



 // skip leading and trailing whitespace

 // and return everything in between

  return this.replace(/^\s*(\b.*\b|)\s*$/, "$1");



}



//isEmpty method for strings. Check if a string is Empty or contains only spaces

String.prototype.SG_isEmpty = function() {

    if (this.length == 0 || this.SG_trim() == "")

        return true;

    else

        return false;

}





/*

 *  form functions

 */

//this function is used to simulate the behaviour of a combo box

//input: formname   -> string containing the form name

//       textname   -> text field name in the form

//       selectname -> select field name in the form

//this callback must be called in the text field on a keyup event:

//onKeyUp="return changedText('FrmName', 'TextFieldName', 'SelectFieldName');"

function SG_changedText(formname, textname, selectname) {

    var textref = eval("document." + formname + "." + textname);

    var selectref = eval("document." + formname + "." + selectname);

    var i = 0;

    var pos = 0;

    for (i=0; i<selectref.length; i++){

        if (selectref.multiple)

            selectref.options[i].selected=false;

        if ((textref.value <= selectref.options[i].text) && pos == 0)

            pos = i;

    }

    if (pos==0)

        pos = i;

    if (pos==selectref.length || (textref.value != selectref.options[pos].text && pos != 0))

        pos--;

    if (pos<selectref.length-1)

        pos++;

    selectref.options[pos].selected=true;

    return false;

}



//this function changes set the focus to a form field

//input: formname  -> string containing the form name

//       fieldname -> field that has to receive the focus

//       selected  -> bool field if true fieldname is selected, otherwise get the focus

function SG_setFocus(formname, fieldname, selected) {

    var fieldref = eval("document." + formname + "." + fieldname);

    if (selected)

        fieldref.select();

    else

        fieldref.focus();

    return false;

}



//this function set the values selected in inputfield in outputfield and in hiddenfield.

//In outputfield set the description of the selected field (the text value of an option tag)

//while in hiddenfield set the value of the selected field

//input: formname  -> string containing the form name

//       inputfield -> select field that has the selected values

//       outputfield -> text field where put the description of the selected values separated by "; "

//       hiddenfield -> hidden field where put the selected values separated by "; "

function SG_setValue(formname, inputfield, outputfield, hiddenfield) {

    var inputref = eval("document." + formname + "." + inputfield);

    var outputref = eval("document." + formname + "." + outputfield);

    var hiddenref = eval("document." + formname + "." + hiddenfield);

    var value=outputref.value;

    for (var i=0; i<inputref.length; i++) {

        if (inputref.options[i].selected==true) {      //set description in outputref and value in hiddenref

            if (value == "") {

                value = inputref.options[i].text;

                hiddenref.value = inputref.options[i].value;

             } else {

                value += "; " + inputref.options[i].text;

                hiddenref.value += "; " + inputref.options[i].value;

            }

        }

    }

    //alert(hiddenref.value);

    outputref.value = value;

}



//set the value of input field to ""

//input: formname   -> string containing the form name

//       inputfield -> field to change

function SG_resetValue(formname, inputfield) {

    var inputref = eval("document." + formname + "." + inputfield);

    inputref.value = "";

}



//submit form "formname" setting action to "action"

//input: formname -> string containing the form name

//       action   -> action for the form

function SG_submitForm(formname, action) {

    var formref = eval("document." + formname);

    formref.action = action;

    formref.submit();

    //the return value avoid a double submit

    return false;

}



//select and deselect all fields "checkboxfield" in form "formname"

//input: formname      -> string containing the form name

//       checkboxfield -> checkbox field to select or deselect

//       sel_desel     -> bool field if true all checkboxes are selected else all are deselected

function SG_selectAll(formname, checkboxfield, sel_desel) {

    var checkref = eval("document." + formname + "." + checkboxfield);

    for (var i=0; i<checkref.length; i++) {

        if (sel_desel)

            checkref[i].checked = true;

        else

            checkref[i].checked = false;

    }

    return false;

}



//check all elements in "formname" and if an element is empty raise an alert box

//if other arguments are passed, only the corresponding form elements are checked

//input: formname         -> string containing the form name

//       lang             -> language for messages. At the moment only 'it' and 'en'

//       other_parameters -> optional. name of the elements to check

function SG_checkForm(formname, lang) {

    if (arguments.length > 1) {

        for (var i=2; i<arguments.length; i++) {

            var elref = eval("document." + formname + "." + arguments[i]);

            if (elref.value.SG_isEmpty()) {

                if (elref.title && elref.title != "")

                    if (lang=='it')

                        alert("Inserire un valore nel campo " + elref.title);

                    else if (lang == 'en')

                        alert("Fill in field " + elref.title);

                    else if (lang == 'fr')

                        alert("Complétez le champ " + elref.name);

                else

                    if (lang=='it')

                        alert("Inserire un valore nel campo " + elref.name);

                    else if (lang == 'en')

                        alert("Fill in field " + elref.name);

                    else if (lang == 'fr')

                        alert("Complétez le champ " + elref.name);

                elref.focus();

                return false;

            }

        }

    } else {

        var formref = eval("document." + formname);

        for (var i=0; i<formref.elements.length; i++) {

            if (formref.elements[i].value.SG_isEmpty()) {

                if (lang=='it')

                    alert("Inserire un valore nel campo " + formref.elements[i].name);

                else if (lang == 'en')

                    alert("Fill in field " + formref.elements[i].name);

                else if (lang == 'fr')

                    alert("Complétez le champ " + formref.elements[i].name);

                formref.elements[i].focus();

                return false;

            }

        }

    }

    return true;

}



//check "field" elements in "formname" and if empty returns false

//input: formname         -> string containing the form name

//       field            -> field to check

function SG_checkField(formname, field) {

    var elref = eval("document." + formname + "." + field);

    if (elref.value.SG_isEmpty())

        return false;

    return true;

}



//check in "formname" if element1 and element2 are equal and not empty

//input: formname -> string containing the form name

//       lang     -> language for messages. At the moment only 'it'

//       element1 -> string containing the name of the first element

//       element2 -> string containing the name of the second element

function SG_checkPassword(formname, lang, element1, element2) {

    var elref1 = eval("document." + formname + "." + element1);

    var elref2 = eval("document." + formname + "." + element2);

    if (SG_checkForm(formname, lang, element1, element2)) {

        if (elref1.value != elref2.value) {

            if (lang=='it')

                alert("Le due password non coincidono");

            else if (lang == 'en')

                alert("Password are not identical");

            else if (lang == 'fr')

                alert("Password are not identical");

            elref1.focus();

            return false;

        }

    } else {

        return false

    }

    return true;

}



/*

 *  DHTML style/layout functions

 */

//get the src attribute of "idElement" image

//(works with Mozilla, Netscape 6, Internet Explorer 5)

//input:  idElement -> string containing the id of the element to show

//output: string containing the src attribute if idElement

function SG_getImageSrc(idElement) {

    return document.getElementById(idElement).src;

}

function SG_getImageWidth(idElement) {

    return document.getElementById(idElement).width;

}

function SG_getImageHeight(idElement) {

    return document.getElementById(idElement).height;

}



//change style class associated to the element "idElement" between "class1" and "class2" 

//(works with Mozilla, Netscape 6, Internet Explorer 5)

//input: idElement -> string containing the id of the element

//       class1    -> name of a class style

//       class2    -> name of the other class style

function SG_changeClass(idElement, class1, class2) {

    if (document.getElementById(idElement).className == class1)

        document.getElementById(idElement).className = class2;

    else

        document.getElementById(idElement).className = class1;

}



//switch display status of the element "idElement" between "block" and "display" 

//(works with Mozilla, Netscape 6, Internet Explorer 5)

//input: idElement -> string containing the id of the element

function SG_hide_showElement(idElement) {

    var elref = document.getElementById(idElement)

    if (elref.style.display == "block")

        elref.style.display = "none";

    else

        elref.style.display = "block";

}



//show the "idElement": set display property of "idElement" to "block" and display property of other elements passed to "none" 

//(works with Mozilla, Netscape 6, Internet Explorer 5)

//input: idElement        -> string containing the id of the element to show

//       other_parameters -> optional. name of the elements to hide

function SG_showElement_hideOthers(idElement) {

    var el_to_show = document.getElementById(idElement)

    el_to_show.style.display = "block";

    for (var i=1; i<arguments.length; i++) {

        var el_to_hide = document.getElementById(arguments[i])

        el_to_hide.style.display = "none";

    }

    return true;

}



//open the image in the visible layer in a new window. Layer id must be a common string vollowed by an integer 

//(i.e. Layer1, Layer2, ecc...). The same for the image id (i.e. imgLayer1, imgLayer2, ecc...). 

//The function loops trough the Layers and check if the style is set to block (i.e Layer3). 

//When found get image src of the image imgLayer3 and open it in a new window. 

//(works with Mozilla, Netscape 6, Internet Explorer 5)

//input: idLayerBaseName -> string containing the base name id of the elements

//       idImageBaseName -> string containing the base name id of the images

//       lang            -> optional. lang to pass to the detail page

function SG_openVisibleLayer(idLayerBaseName, idImageBaseName) {

    for (var i=1; i<Number.MAX_VALUE; i++) {

        var layer_ref = document.getElementById(idLayerBaseName + i.toString());

        if (typeof layer_ref == 'undefined')

            return false;

        if (layer_ref.style.display == "block") {

            image_src = SG_getImageSrc(idImageBaseName + i.toString());

            new_img_src = image_src.substring(0, image_src.length-4) + "G.jpg";

            option_str = "scrollbars,resizable"

            //the escape function below has been deprecated in favor of encodeURI and encodeURIComponent

            //these works only in Explorer 5.5 for Win and Mozilla

            if (arguments.length >= 3)

                new_win = window.open("detail/?img=" + escape(new_img_src) + "&lang=" + arguments[2], "Detail", option_str);

            else

                new_win = window.open("detail/?img=" + escape(new_img_src), "Detail", option_str);

            new_win.focus();

            return false;

        }

    }

}



//open the new window "win_name" with location "an_url" and give it focus

//if a third argument is present it is passed to the window.open function

//input: an_url   -> url to open

//       win_name -> window name

function SG_openWindow_giveFocus(an_url, win_name) {

    if (arguments.length == 3)

        var new_win = window.open(an_url, win_name, arguments[2]);

    else

        var new_win = window.open(an_url, win_name, "");

    new_win.focus();

    return false;

}



/*

 *  HTML functions

 */



//build a link using the prompt function. Returns a string with the link or null.

//(works with Mozilla, Netscape 6, Internet Explorer 5)

//input: className -> optional first argument. Link class name

//       target    -> optional second argument. Link target (default=_blank)

function SG_buildLink() {

    var linkurl = "";

    var linkword = "";

    var target = "_blank";

    var className = "";

    if (arguments.length == 2) {

        className = arguments[0];

        target = arguments[1];

    } else if (arguments.length == 1) {

        className = arguments[0];

    }

    linkurl = prompt("Inserire una URL valida", "http://www.sgconsulting.it/");

    if (linkurl == null || linkurl == "")

        return null;

    linkword = prompt("Inserire le parole da linkare", "Clicca qui");

    if (linkword == null || linkword == "")

        return null;

    if (className != "")

        return '<a href="' + linkurl + '" class="' + className + '" target="' + target + '">' + linkword + '</a>';

    else

        return '<a href="' + linkurl + '" target="' + target + '">' + linkword + '</a>';

}



//append a link to element 'elementid'. Uses SG_buildLink to get the link

//(works with Mozilla, Netscape 6, Internet Explorer 5)

//input: elementid -> string containing the id name of the element where the link must be added.

//       className -> optional first argument. Link class name

//       target    -> optional second argument. Link target (default=_blank)

function SG_addLink(elementid) {

    if (arguments.length == 1)

        var linkstr = SG_buildLink();

    else if (arguments.length == 2)

        var linkstr = SG_buildLink(arguments[1]);

    else

        var linkstr = SG_buildLink(arguments[1], arguments[2]);

    if (linkstr == null) {

        alert("link non valido");

        return false;

    }

    if (document.getElementById(elementid).value) {

        alert(typeof document.getElementById(elementid).value);

        document.getElementById(elementid).value += linkstr;

        return false;

    }

    if (document.getElementById(elementid).innerHTML) {

        document.getElementById(elementid).innerHTML += linkstr;

        return false;

    }

    document.getElementById(elementid).value = linkstr;

    return false;

}



//append <br> tag to element 'elementid'.

//(works with Mozilla, Netscape 6, Internet Explorer 5)

//input: elementid -> string containing the id name of the element where the <br> must be added.

function SG_addBr(elementid) {

    if (document.getElementById(elementid).value) {

        document.getElementById(elementid).value += "<br>";

        return false;

    }

    if (document.getElementById(elementid).innerHTML) {

        document.getElementById(elementid).innerHTML += "<br>";

        return false;

    }

    document.getElementById(elementid).value = "<br>";

    return false;

}