// JScript File

/**
 * An autosuggest textbox control.
 * @class
 * @scope public
 */
function FriendSelectorControl(oTextbox /*:HTMLInputElement*/, 
                            oHidden /*:HTMLInputElement*/, 
                            oProvider /*:SuggestionProvider*/,
                            bAllowUserText /*:Boolean*/,
                            oDropDownButton /*:HTMLInputElement*/) {
    
    try
    {
        /**
         * The currently selected suggestions.
         * @scope private
         */   
        this.cur /*:int*/ = -1;
        
        /**
         * The dropdown list layer.
         * @scope private
         */
        this.layer = null;
        
        /**
         * Suggestion provider for the autosuggest feature.
         * @scope private.
         */
        this.provider /*:SuggestionProvider*/ = oProvider;
       
        /**
         * The textbox to capture.
         * @scope private
         */
        this.textbox /*:HTMLInputElement*/ = oTextbox;
        this.textbox.setAttribute("autocomplete", "off");

        this.hidden /*:HTMLInputElement*/ = oHidden;
        this.tbvalue /*:HTMLInputElement*/ = null;
        this.AllowUserText /*:Boolean*/ = bAllowUserText;
        this.dropdownbutton = oDropDownButton;
        this.dropdownbuttonclicked = false;
        
        this.textboxvalue = null;
        this.hiddenvalue = null;

        //initialize the control
        this.init();
    }
    catch(err)
    {
    
    }
}

/**
 * Autosuggests one or more suggestions for what the user has typed.
 * If no suggestions are passed in, then no autosuggest occurs.
 * @scope private
 * @param aSuggestions An array of suggestion strings.
 * @param bTypeAhead If the control should provide a type ahead suggestion.
 */
FriendSelectorControl.prototype.autosuggest = function (aSuggestions /*:Array*/,
                                                     bTypeAhead /*:boolean*/) {
    
    //make sure there's at least one suggestion
    this.hidden.value="";
    if (aSuggestions.length > 0) {
        if (bTypeAhead) {
           this.typeAhead(aSuggestions[0]);
        }
        
        this.showSuggestions(aSuggestions);
    } else {
        this.hideSuggestions();
    }
};

/**
 * Creates the dropdown layer to display multiple suggestions.
 * @scope private
 */
FriendSelectorControl.prototype.createDropDown = function () {

    var oThis = this;

    //create the layer and assign styles
    this.layer = document.createElement("div");
    //this.layer = document.createElement("span");
    this.layer.className = "suggestions";
    this.layer.style.visibility = "hidden";
    this.layer.style.width = this.textbox.offsetWidth;
    this.layer.setAttribute("id", "suggestions");

    //when the user clicks on the a suggestion, get the text (innerHTML)
    //and place it into a textbox
    this.layer.onmousedown = 
    this.layer.onmouseup = 
    this.layer.onmouseover = function (oEvent) {
        oEvent = oEvent || window.event;
        oTarget = oEvent.target || oEvent.srcElement;

        if (oEvent.type == "mousedown") {
            if (oTarget.id !== "suggestions") {
                oThis.textbox.value = oTarget.childNodes[oTarget.childNodes.length-2].firstChild.nodeValue
                oThis.hidden.value = oTarget.childNodes[oTarget.childNodes.length-1].firstChild.nodeValue
                oThis.textboxvalue = oThis.textbox.value;
                oThis.hiddenvalue = oThis.hidden.value;
                oThis.hideSuggestions();
            }
        } else if (oEvent.type == "mouseover") {
            oThis.highlightSuggestion(oTarget);
        } else {
            oThis.textbox.focus();
        }
    };
    
    document.body.appendChild(this.layer);
};

/**
 * Gets the left coordinate of the textbox.
 * @scope private
 * @return The left coordinate of the textbox in pixels.
 */
FriendSelectorControl.prototype.getLeft = function () /*:int*/ {

    var oNode = this.textbox;
    var iLeft = 0;
    try
    {
        while(oNode.tagName != "BODY") {
        iLeft += oNode.offsetLeft;
        oNode = oNode.offsetParent;        
    }
    }
    catch (err)
    {
    
    }
    return iLeft;
};

/**
 * Gets the top coordinate of the textbox.
 * @scope private
 * @return The top coordinate of the textbox in pixels.
 */
FriendSelectorControl.prototype.getTop = function () /*:int*/ {

    var oNode = this.textbox;
    var iTop = 0;
    try
    {
        while(oNode.tagName != "BODY") {
        iTop += oNode.offsetTop;
        oNode = oNode.offsetParent;
    }
    }
    catch (err)
    {
    
    }
 
    return iTop;
};

/**
 * Handles three keydown events.
 * @scope private
 * @param oEvent The event object for the keydown event.
 */
FriendSelectorControl.prototype.handleKeyDown = function (oEvent /*:Event*/) {

    switch(oEvent.keyCode) {
        case 38: //up arrow
            this.previousSuggestion();
            break;
        case 40: //down arrow 
            this.nextSuggestion();
            break;
        case 13: //enter
            this.hideSuggestions();
            break;
    }

};

/**
 * Handles keyup events.
 * @scope private
 * @param oEvent The event object for the keyup event.
 */
FriendSelectorControl.prototype.handleKeyUp = function (oEvent /*:Event*/) {
    this.dropdownbuttonclicked = false
    var iKeyCode = oEvent.keyCode;

    //for backspace (8) and delete (46), shows suggestions without typeahead
    if (iKeyCode == 8 || iKeyCode == 46) {
        this.hidden.value = "";
        this.textboxvalue = null;
        this.hiddenvalue = null;
        this.provider.requestSuggestions(this, false);
        
    //make sure not to interfere with non-character keys
    } else if (iKeyCode < 32 || (iKeyCode >= 33 && iKeyCode < 46) || (iKeyCode >= 112 && iKeyCode <= 123)) {
        //ignore
    } else {
        //request suggestions from the suggestion provider with typeahead
        this.provider.requestSuggestions(this, true);
    }
};

FriendSelectorControl.prototype.handlemouseclick = function () {

    //alert("mouse click");
    this.provider.requestSuggestions(this, true);
};


/**
 * Hides the suggestion dropdown.
 * @scope private
 */
FriendSelectorControl.prototype.hideSuggestions = function () {
    this.layer.style.visibility = "hidden";
    
    //alert('hide me');
    
    if (this.dropdownbuttonclicked == true && this.hiddenvalue !== null) {
        this.textbox.value = this.textboxvalue;
        this.hidden.value = this.hiddenvalue;
        /*Add Postback to perform after selection task*/
        PostSelection();
    }
    this.dropdownbuttonclicked = false
    
};

/**
 * Highlights the given node in the suggestions dropdown.
 * @scope private
 * @param oSuggestionNode The node representing a suggestion in the dropdown.
 */
FriendSelectorControl.prototype.highlightSuggestion = function (oSuggestionNode) {
    
    for (var i=0; i < this.layer.childNodes.length; i++) {
        var oNode = this.layer.childNodes[i];
        if (oNode == oSuggestionNode) {
            oNode.className = "current"
        } else if (oNode.className == "current") {
            oNode.className = "";
        }
    }
};

/**
 * Initializes the textbox with event handlers for
 * auto suggest functionality.
 * @scope private
 */
FriendSelectorControl.prototype.init = function () {
    //save a reference to this object
    var oThis = this;
    
    //assign the onkeyup event handler
    this.textbox.onkeyup = function (oEvent) {

        //check for the proper location of the event object
        if (!oEvent) {
            oEvent = window.event;
        }    
        
        //call the handleKeyUp() method with the event object
        oThis.handleKeyUp(oEvent);
    };
    
    //assign onkeydown event handler
    this.textbox.onkeydown = function (oEvent) {
         //

        //check for the proper location of the event object
        if (!oEvent) {
            oEvent = window.event;
        }    
        
        //call the handleKeyDown() method with the event object
        oThis.handleKeyDown(oEvent);
    };
    
    //assign onblur event handler (hides suggestions)    
    this.textbox.onblur = function () {
        if (oThis.dropdownbuttonclicked == false) {
            oThis.hideSuggestions();
        }
        if (oThis.AllowUserText==false)
        {
            if (oThis.hidden.value=="")
            {
                oThis.textbox.value="";
            }
        }
    };

    this.dropdownbutton.onclick = function () {
        if (oThis.dropdownbuttonclicked == true) {
            oThis.hideSuggestions();
        } else {
            oThis.dropdownbuttonclicked = true;
            if (oThis.hidden.value !== "") {
                oThis.textboxvalue = oThis.textbox.value;
                oThis.hiddenvalue = oThis.hidden.value;
            }
            oThis.hidden.value = "";
            oThis.textbox.value = "";
            oThis.handlemouseclick();
        }
    };
   
    //create the suggestions dropdown
    this.createDropDown();    
};

/**
 * Highlights the next suggestion in the dropdown and
 * places the suggestion into the textbox.
 * @scope private
 */
FriendSelectorControl.prototype.nextSuggestion = function () {
    var cSuggestionNodes = this.layer.childNodes;



    if ((this.hidden.value==""))
    {
        this.cur = -1;
    }
    
    if (cSuggestionNodes.length > 0 && this.cur < cSuggestionNodes.length-1) {
        var oNode = cSuggestionNodes[++this.cur];
        this.highlightSuggestion(oNode);
             
        this.textbox.value = oNode.childNodes[oNode.childNodes.length-2].firstChild.nodeValue; 
        this.hidden.value = oNode.childNodes[oNode.childNodes.length-1].firstChild.nodeValue; 
    }
};

/**
 * Highlights the previous suggestion in the dropdown and
 * places the suggestion into the textbox.
 * @scope private
 */
FriendSelectorControl.prototype.previousSuggestion = function () {
    var cSuggestionNodes = this.layer.childNodes;

    if (cSuggestionNodes.length > 0 && this.cur > 0) {
        var oNode = cSuggestionNodes[--this.cur];
        this.highlightSuggestion(oNode);
        this.textbox.value = oNode.childNodes[oNode.childNodes.length-2].firstChild.nodeValue; 
        this.hidden.value = oNode.childNodes[oNode.childNodes.length-1].firstChild.nodeValue;       
    }
};

/**
 * Selects a range of text in the textbox.
 * @scope public
 * @param iStart The start index (base 0) of the selection.
 * @param iLength The number of characters to select.
 */
FriendSelectorControl.prototype.selectRange = function (iStart /*:int*/, iLength /*:int*/) {

    //use text ranges for Internet Explorer
    if (this.textbox.createTextRange) {
        var oRange = this.textbox.createTextRange(); 
        oRange.moveStart("character", iStart); 
        oRange.moveEnd("character", iLength - this.textbox.value.length);      
        oRange.select();
        
    //use setSelectionRange() for Mozilla
    } else if (this.textbox.setSelectionRange) {
        this.textbox.setSelectionRange(iStart, iLength);
    }     

    //set focus back to the textbox
    this.textbox.focus();      
}; 

/**
 * Builds the suggestion layer contents, moves it into position,
 * and displays the layer.
 * @scope private
 * @param aSuggestions An array of suggestions for the control.
 */
FriendSelectorControl.prototype.showSuggestions = function (aSuggestions /*:Array*/) {
    
    var oDiv = null;
    var oDiv2 = null;
    this.layer.innerHTML = "";  //clear contents of the layer
    
    var oSugNum = aSuggestions.length
    this.layer.style.overflow = "hidden";
    
    if ((oSugNum > 10))
    {
        if (this.dropdownbuttonclicked == true) {
            this.layer.style.overflow = "scroll";
        } else {
            oSugNum = 10;
        }
        this.layer.style.height = "210px";
    } else {
        this.layer.style.height =  (21 * oSugNum) + "px";  
    }
    
    //alert(this.textbox.value);
    
    for (var i=0; i < oSugNum; i++) {
        var sSuggest = aSuggestions[i];        

        oDiv = document.createElement("div");
        
        var str = sSuggest.substring(0, sSuggest.indexOf("|"));

        var strU = str.toUpperCase();
        var tbU = this.textbox.value;
        tbU = tbU.toUpperCase();
        
        var findind = strU.indexOf(tbU);
        if (findind != -1)
        {
            var sNewSug = str.substring(findind, (findind) + tbU.length);
            oDiv.innerHTML = str.replace(eval("/" + this.textbox.value + "/i"), "<span class='fbhighlight'>" + sNewSug + "</span>");       
        }
                
        oText = document.createElement("span");
        oText.appendChild(document.createTextNode(sSuggest.substring(0, sSuggest.indexOf("|"))));
        oText.style.display = "none";
        oDiv.appendChild(oText);

        oValue = document.createElement("span");
        oValue.appendChild(document.createTextNode(sSuggest.substring(sSuggest.indexOf("|") + 1)))
        oValue.style.display = "none";
        oDiv.appendChild(oValue);

        this.layer.appendChild(oDiv);
        
        //oDiv2 = document.createElement("div");
    }
    
    var browser=navigator.appName;
    var leftindent = 0;
    var heightindent = 0;
   
    if ((browser=="Microsoft Internet Explorer"))
    {
        leftindent = 0;
        heightindent = 5;
    }
    this.layer.style.left = this.getLeft() + leftindent + "px";
    this.layer.style.top = (this.getTop()+this.textbox.offsetHeight) + heightindent + "px";
    this.layer.style.visibility = "visible";
   
    this.layer.style.width = this.textbox.offsetWidth + "px"; //this.textbox.width;
    
};

/**
 * Inserts a suggestion into the textbox, highlighting the 
 * suggested part of the text.
 * @scope private
 * @param sSuggestion The suggestion for the textbox.
 */
FriendSelectorControl.prototype.typeAhead = function (sSuggestion /*:String*/) {

    //check for support of typeahead functionality
    if (this.textbox.createTextRange || this.textbox.setSelectionRange){
        var iLen = this.textbox.value.length; 
        
        var sug = sSuggestion.substring(0, sSuggestion.indexOf("|"))
        var tbU = this.textbox.value;

        if (tbU.toUpperCase() == sug.toUpperCase())
        {
            this.hidden.value = sSuggestion.substring(sSuggestion.indexOf("|") + 1);            
        }
        
        this.selectRange(iLen, sSuggestion.length);
    }
};
FriendSelectorControl.prototype.ClearSuggestions = function () {
    this.textbox.value = "";
    this.hidden.value = "";
};